CN107794377B - Au plasma enrichment method in a kind of soil - Google Patents
Au plasma enrichment method in a kind of soil Download PDFInfo
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- CN107794377B CN107794377B CN201710965710.1A CN201710965710A CN107794377B CN 107794377 B CN107794377 B CN 107794377B CN 201710965710 A CN201710965710 A CN 201710965710A CN 107794377 B CN107794377 B CN 107794377B
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- foamed plastics
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- candle ash
- extracting solution
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/16—Extraction of metal compounds from ores or concentrates by wet processes by leaching in organic solutions
- C22B3/1608—Leaching with acyclic or carbocyclic agents
- C22B3/1616—Leaching with acyclic or carbocyclic agents of a single type
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
- C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses Au plasma enrichment methods in a kind of soil, include the following steps: S1: weighing sample, calcination is transferred in container after cooling；S2: the Fe of 1:1 chloroazotic acid and 95-120g/L is added in the container of step S13+Solution, chloroazotic acid and Fe3+The volume ratio of solution is 45-60:1, ebuillition of heated 1.5-3h；Heating evaporation is concentrated into acidity in 5%-10%, is diluted with water Cheng Yici extracting solution, spare；S3: being added foamed plastics in an extracting solution of step S2, shakes 45-90min；S4: taking out foamed plastics, washes with water clean, drying；S5: the foamed plastics in step S4 is put into container, and the thiourea solution that concentration is 10-12g/L is added in a reservoir, places a limiter in a reservoir thus by the position restriction of foamed plastics below the liquid level of thiourea solution；It is covered in the opening of container, container is heated into 30-60min in boiling water bath；Constant volume obtains concentrated extracting solution after taking out foamed plastics while hot.Has the effect of improving extracted amount to improve test accuracy.
Description
Technical field
The present invention relates to heavy metal-polluted soil Treatment process field, in particular to Au plasma enrichment method in a kind of soil.
Background technique
Heavy metal pollution of soil is more serious one of the environmental problem in the whole world.Usual heavy metal in soil total amount is higher, and its is right
Environment is potentially hazardous bigger.Currently, the recovery technique about heavy metal pollution, still rests on based on phytoremediation, it is auxiliary
With chemistry, microorganism and Agro-ecology measure technological phase on, it is expected that reaching the biological effectiveness for increasing heavy metal, promote
The growth and absorption of plant, to improve the overall efficiency of phytoremediation.With phytoremediation be leading " system engineering " still not
Limitation that is mature, still having technology.Therefore, it is necessary to be monitored to the content of beary metal in soil, need to its content into
Row detection, the first step seek to the gold in soil carrying out enrichment extraction, and wherein steel foams method is most common Extraction and enrichment
One of method, steel foams method generally comprise the steps: soil pattern being immersed in chloroazotic acid extract gold first, then use foam
Plastics adsorb gold ion from extracting solution, are finally extracted gold ion from foamed plastics with thiocarbamide, complete Au plasma
And enrichment.
The principle of thiourea gold extraction is as follows: 1) (thiocarbamide also known as vulcanizes urea element (H2NCSNH2), it in aqueous solution can be with transition
Metal ion generates stable complex cation, and the general formula of reaction can be write as: Men++x(Thio)→[Me(Thio)x]n+Thio in formula
For thiocarbamide；N is chemical valence；X is ligancy.Thiocarbamide as a kind of strong acidic site body, can by the nonbonding electron pair of nitrogen-atoms or
Sulphur atom is in conjunction with metalloform-selective.Au (I)-thiocarbamide complex cation (Au (Thio)2+) cationic property with it is corresponding
Cyanogen complex anion (Au (CN)2-) property is entirely different.Although the former stability is more slightly worse than the latter, remove Hg (Thio)4 2+Than
Au(Thio)2+Stablize outer, other metals (such as Ag+、Cu2+、Cd2+、Pb2+、Zn2+、Fe2+、Bi3+) thiourea complex be all not so good as Au
(Thio)2+Stablize, therefore thiocarbamide is to Au+With preferable selectivity.Thiocarbamide is unstable in alkaline solution, easily decomposes and generates vulcanization
Object and cyanamide, cyanamide hydrolysis then generate urea.Thiocarbamide has reducing property in an acidic solution, is easily oxidized and generates two sulphur
Carbonamidine (is abbreviated as RSSR), and two sulphur carbonamidines further aoxidize, are decomposed into cyanamide and elementary sulfur, reaction examination are as follows: 2SC
(NH2)2=(SCN2H3)2+2H++2e；(SCN2H3)2=SC (NH2)2+H2Thiocarbamide in NCN+S solution increases with acidity of medium
And it tends towards stability.As the pH < 1.75 of medium, the thiocarbamide of high concentration is easy to oxidize, therefore the appropriate to the occasion acid using dilute thiocarbamide of gold lixiviation
Property solution.
Foamed plastics is usually the liquid level for floating on thiourea solution in leaching process, leads to some foamed plastics and thiocarbamide
Solution time of contact is short, and thiourea solution is relatively difficult to the inside into foamed plastics, extracts not complete enough.
Summary of the invention
The object of the present invention is to provide Au plasma enrichment methods in a kind of soil, and which solve existing Extraction and enrichment sides
The problem of method is extracted not exclusively, and test accuracy is influenced has the effect of improving extracted amount to improve test accuracy.
Above-mentioned technical purpose of the invention has the technical scheme that
Au plasma enrichment method in a kind of soil, characterized in that include the following steps:
S1: weighing sample, and calcination is transferred in container after cooling；
S2: the Fe of 1:1 chloroazotic acid and 95-120g/L is added in the container of step S13+Solution, chloroazotic acid and Fe3+The body of solution
Product is than being 45-60:1, ebuillition of heated 1.5-3h；Heating evaporation is concentrated into acidity in 5%-10%, is diluted with water into primary extraction
Liquid, it is spare；
S3: being added foamed plastics in an extracting solution of step S2, places first limiter in a reservoir to steep
The position restriction of foam plastics an extracting solution liquid level hereinafter, boiling and shaking 45-90min；
S4: taking out foamed plastics, washes with water clean, drying；
S5: the foamed plastics in step S4 is put into container, and it is molten that the thiocarbamide that concentration is 10-12g/L is added in a reservoir
Liquid places second limiter in a reservoir thus by the position restriction of foamed plastics below the liquid level of thiourea solution；In container
Opening covered, container is heated into 30-60min in boiling water bath；Constant volume is concentrated after taking out foamed plastics while hot
Extracting solution.
Further preferably are as follows: first limiter includes fixed part, blocking portion and the company for connecting portion and blocking portion
Socket part, fixed part are overlapped in the opening of container, and blocking portion is equipped with leak hole, and the size of leak hole is less than foamed plastics.
Using the above scheme, first limiter is easy to use and is conducive to the liquid that foamed plastics is limited in an extracting solution
Below face, is conducive to the contact area for improving foamed plastics and an extracting solution, improves adsorption efficiency.
Further preferably are as follows: second limiter includes fixed cup and the press section in fixed cup, and fixed cup upper end is taken
It is connected to the opening of container, spring, spring and any one in fixed cup or press section are equipped between press section and fixed cup
It is fixed；The bottom of fixed cup is equipped with leak hole, and gap is equipped between press section and the bottom of fixed cup, and the size in gap, which is at least, steeps
The size of foam plastics.
Using the above scheme, foamed plastics is defined to the gap location between press section and fixed cup in second limiter,
One side foamed plastics can be soaked in thiourea solution, improve the contact area of foamed plastics and thiourea solution, improve absorption
Efficiency；On the other hand, by press press section, can crushed foam plastics, make thiourea solution in the gap of foamed plastics not
It breaks off a friendship and swaps out into improving extraction efficiency to improve the contacting efficiency of the gold ion in thiocarbamide molecule and foamed plastics.
Further preferably are as follows: press section is cup-shaped setting, and the outer wall and fixed cup internal wall transitions of press section cooperate；Press section
Bottom be equipped with leak hole, the size of leak hole is less than foamed plastics.
Using the above scheme, the possibility for reducing gap volatilization of the solvent between press section and fixed cup, keeps thiocarbamide molten
The liquid level stabilizing of liquid prevents foamed plastics from reducing and being exposed except liquid level with liquid level.
Further preferably are as follows: include the following steps:
S1: weighing sample, and calcination is transferred in container after cooling；
S2: the Fe of 1:1 chloroazotic acid and 95-120g/L is added in the container of step S13+Solution, chloroazotic acid and Fe3+The body of solution
Product is than being 50:1, ebuillition of heated 1.5-3h；Heating evaporation is concentrated into acidity in 5%-10%, is diluted with water Cheng Yici extracting solution,
It is spare；
S3: foamed plastics is added in an extracting solution of step S2, first limiter is put into container, by foam plastic
Material is blocked in below the liquid level an of extracting solution, is boiled and is shaken 45-90min；
S4: taking out foamed plastics, washes with water clean, drying；
S5: the thiourea solution that concentration is 10-12g/L is added in a reservoir, fixed cup is put into container first, is placed into
Press section, is then placed in fixed cup by the foamed plastics in step S4, and the bottom of press section is contacted with thiourea solution, thus will
The position restriction of foamed plastics is below the liquid level of thiourea solution；Foam plastic is repeatedly extruded by pressing press section in extraction process
Material；It is covered in the opening of container, container is heated into 30-60min in boiling water bath；Constant volume after taking-up foamed plastics while hot
Obtain concentrated extracting solution.
Further preferably are as follows: in step S1, the technique of calcination is with the heating rate of 5 DEG C/min in Muffle furnace from room temperature
650 DEG C are warming up to, 1.5h, Temperature fall are kept the temperature.
Further preferably are as follows: in step S3, the addition mass ratio of foamed plastics and an extracting solution is 2-5:1000.
Further preferably are as follows: foamed plastics is the modified foamed plastics of candle ash, is prepared as follows to obtain:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
It is after accumulating to certain thickness to candle ash that the collection of candle ash is spare；
A2: by candle ash, cooling is spare after calcination 1-2h under the conditions of 500-600 DEG C；
A3: by the candle ash and polyether polyol, diisocyanate, water, catalyst, silicon foams stabilization in step A2
Agent addition is coated in the container of release agent, is foamed in 60-70 DEG C of baking oven after mixing under stiring, foamed time is
20-25min；In parts by weight, the content of each component is as follows: candle ash: 1.6-6.4 parts；Polyether polyol: 20-25 parts；Two
Isocyanates: 45-60 parts；Water: 3.0-3.4 parts；Catalyst: 1.5-2.5 parts；Organic foam stabilizer: 0.5-0.65 parts；
A4: demoulding cleans up rear drying to obtain candle with ethyl alcohol, isopropanol, dish washing liquid and water after cutting foam
The modified foamed plastics of ash.
Using the above scheme, foamed plastics is modified with candle ash, it can be improved foamed plastics to gold ion in soil
Absorption property because candle ash is a kind of substance with porous structure, have stronger absorption property, change by candle ash
Property after foamed plastics porosity improve, to improve to the absorption property of gold ion.
Further preferably are as follows: the calcination technique of step A2 are as follows: be warming up to 200 DEG C with the heating rate of 5 DEG C/min, heat preservation
30min is continued to be warming up to 500-600 DEG C with the heating rate of 5 DEG C/min, keeps the temperature 1-2h, cooled to room temperature.
Further preferably are as follows: in step A3, candle ash is mixed with polyether polyol first, ultrasonic wave added dispersion, then with its
He mixes component.
In conclusion the invention has the following advantages: the use of 1, first limiter and second limiter is to raising
The extraction efficiency of gold ion has critical effect, on the one hand, foamed plastics is limited in an extracting solution by first limiter
Liquid level below, increase foamed plastics and an extracting solution contact area, raising adsorption efficiency；Second limiter is by foam plastic
Material is limited in below the liquid level of thiourea solution and continuous crushed foam plastics are completed in bubble and in solution during the test
Fluid exchange improve extraction efficiency so that the gold ion in bubble sufficiently be extracted；2, by foamed plastics candle ash
It is modified, it can be improved foamed plastics to the absorption property of gold ion in soil, because candle ash is a kind of with porous structure
Substance, there is stronger absorption property, improved by the modified foamed plastics porosity of candle ash, thus improve to gold from
The absorption property of son.
Detailed description of the invention
The first limiter and container that Fig. 1 is embodiment 15 are with the use of status diagram；
The second limiter and container that Fig. 2 is embodiment 15 are with the use of status diagram；
Fig. 3 is the portion A partial enlarged view in Fig. 2 of embodiment 15.
In figure, 1, container；2, first limiter；21, fixed part；22, blocking portion；23, interconnecting piece；3, leak hole；4, second
Limiter；41, fixed cup；411, flange；42, press section；43, spring；44, gap.
Specific embodiment
Invention is further described in detail below.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the protection scope of invention.
Embodiment 1: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 550 DEG C, keeps the temperature 1.5h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 65 DEG C of baking oven
It foams, foamed time 22min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P1.
Embodiment 2: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 550 DEG C, keeps the temperature 1h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 65 DEG C of baking oven
It foams, foamed time 22min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P2.
Embodiment 3: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 550 DEG C, keeps the temperature 2h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 65 DEG C of baking oven
It foams, foamed time 22min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P3.
Embodiment 4: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 500 DEG C, keeps the temperature 1.5h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 65 DEG C of baking oven
It foams, foamed time 22min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P4.
Embodiment 5: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 600 DEG C, keeps the temperature 1.5h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 65 DEG C of baking oven
It foams, foamed time 22min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P5.
Embodiment 6: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 550 DEG C, keeps the temperature 1.5h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 60 DEG C of baking oven
It foams, foamed time 25min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P6.
Embodiment 7: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A1: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；Deng
With scraper candle ash scraped after accumulating to certain thickness to candle ash spare；
A2: candle ash is placed in crucible, is warming up to 200 DEG C with the heating rate of 5 DEG C/min, is kept the temperature 30min, continue with
The heating rate of 5 DEG C/min is warming up to 550 DEG C, keeps the temperature 1.5h, and cooled to room temperature is spare；
A3: raw material is weighed according to following parts by weight: the candle ash in step A2: 4.8 parts；Polyether polyol: 22 parts；Two is different
Cyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol uses
Polyether triol 330N, diisocyanate use toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, silicon foams
Stabilizer is polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water, urge
Agent, organic foam stabilizer are added are coated in the container of release agent together, after mixing under stiring in 70 DEG C of baking oven
It foams, foamed time 20min；
A4: demoulding is put into 60 with after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
DEG C baking oven in the modified foamed plastics of drying to obtain candle ash, be cut into 3cm*1.5cm*1.5cm fritter, be denoted as P7.
Embodiment 8-12: a kind of preparation method of the modified foamed plastics of candle ash, the difference with embodiment 1 is only that, is walked
In rapid A3, candle ash is different with the content of polyether polyol, diisocyanate, water, catalyst, organic foam stabilizer, presses
According to parts by weight meter, the content of each component is as shown in table 1；Wherein, polyether polyol uses polyether triol 330N, and diisocyanate is adopted
With toluene di-isocyanate(TDI), catalyst is dibutyl tin dilaurate, and organic foam stabilizer is polyether silicone oil；It is prepared
Foamed plastics be respectively labeled as P8, P9, P10, P11, P12.
The component and content table of foamed plastics in 1 embodiment 1 of table, embodiment 8-12
Embodiment 13: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A11: the glass cleaned up the preparation of candle ash: is placed in accumulation candle ash above the candle flame being burning；
With scraper candle ash scraped after candle ash accumulates to certain thickness spare；
A21: raw material is weighed according to following parts by weight: the candle ash in step A11: 4.8 parts；Polyether polyol: 22 parts；Two
Isocyanates: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organic foam stabilizer: 0.6 part；Wherein, polyether polyol is adopted
With polyether triol 330N, diisocyanate uses toluene di-isocyanate(TDI), and catalyst is dibutyl tin dilaurate, organosilicon bubble
Foam stabilizers are polyether silicone oil；Ultrasonic disperse after first mixing candle ash and polyether polyol, then with diisocyanate, water,
Catalyst, organic foam stabilizer are added are coated in the container of release agent together, in 65 DEG C of baking oven after mixing under stiring
In foam, foamed time 22min；
A31: demoulding is put into after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
Drying to obtain candle ash is modified foamed plastics in 60 DEG C of baking oven, is cut into 3cm*1.5cm*1.5cm fritter, is denoted as P13.
Embodiment 14: a kind of preparation method of the modified foamed plastics of candle ash includes the following steps:
A12: polyether polyol, diisocyanate, water, catalyst, organic foam stabilizer addition are coated with release agent
Container in, under stiring mix after foam in 65 DEG C of baking oven, foamed time 22min；In parts by weight, respectively
The content of component is as follows: polyether polyol: 22 parts；Diisocyanate: 50 parts；Water: 3.2 parts；Catalyst: 2.0 parts；Organosilicon bubble
Foam stabilizers: 0.6 part；Wherein, polyether polyol uses polyether triol 330N, and diisocyanate uses toluene di-isocyanate(TDI),
Catalyst is dibutyl tin dilaurate, and organic foam stabilizer is polyether silicone oil；
A22: demoulding is put into after ethyl alcohol, isopropanol, dish washing liquid and water ultrasonic cleaning completely respectively after cutting foam
Drying to obtain candle ash is modified foamed plastics in 60 DEG C of baking oven, is cut into 3cm*1.5cm*1.5cm fritter, is denoted as P14.
Embodiment 15: Au plasma enrichment method in a kind of soil includes the following steps:
S1: weighing 5g soil pattern, is placed in porcelain cupel, place it in Muffle furnace with the heating rate of 5 DEG C/min from
Room temperature is warming up to 650 DEG C, keeps the temperature 1.5h, after being naturally cooling to room temperature, is transferred in container；
S2: the Fe of the 1:1 chloroazotic acid of 50mL and the 100g/L of 1mL is added in the container of step S13+Solution, cap upper surface
Ware, ebuillition of heated 2h；Heating evaporation is concentrated into acidity 8%, is diluted with water to 100mL, and an extracting solution is made, spare；
S3: the modified foamed plastics of candle ash of the 0.3g marked as P1 is added in an extracting solution of step S2, in container
It is inside put into first limiter, foamed plastics is blocked in below the liquid level an of extracting solution, is boiled and shake 60min；Such as Fig. 1 institute
Show, first limiter 2 involved in step S3 is including fixed part 21, blocking portion 22 and is used for connecting portion 21 and blocking portion 22
Interconnecting piece 23, fixed part 21 be disc-shaped, be overlapped in the opening of container 1；Blocking portion 22 is disc-shaped, blocking portion 22 it is outer
Edge and 1 inner wall clearance fit of container, blocking portion 22 are equipped with leak hole 3, and the size of leak hole 3 is less than foamed plastics；First limiter 2
Entire body is made of the corrosion resistant polytetrafluoroethylene material of acid and alkali-resistance, and self weight should meet floating greater than what foamed plastics was subject to
Power, the bottom that height should meet blocking portion can be immersed below the liquid level an of extracting solution；
S4: taking out foamed plastics, rinsed well with deionized water, dries；
S5: the thiourea solution that concentration is 10g/L is added in a reservoir, by second limiter to the foam plastic in step S4
Gold ion in material extracts；
As shown in Fig. 2, second limiter 4 includes the press section 42 of fixed cup 41 and the cup-shaped in fixed cup 41, squeeze
Splenium 42 is sheathed in fixed cup 41, and the outer wall and 41 internal wall transitions of fixed cup of press section 42 cooperate；Outside 41 upper end of fixed cup
Edge circumferential direction is equipped with flange 411, and flange 411 is overlapped in the opening of container 1；Press section 42 and the flange of fixed cup 41 411 it
Between be equipped with spring 43, the flange 411 of spring 43 and fixed cup 41 is fixed；The bottom of fixed cup 41 is equipped with leak hole 3,42 He of press section
Gap 44 is equipped between the bottom of fixed cup 41, the size in gap 44 is at least the size of foamed plastics；The bottom of press section 42
Equipped with leak hole 3, the size of leak hole 3 is less than foamed plastics；4 entire body of second limiter uses the corrosion resistant polytetrafluoroethylene (PTFE) of acid and alkali-resistance
Material is made, and the self weight of press section 42 should meet the buoyancy being subject to greater than foamed plastics, and the height of press section 42 should meet
The bottom of press section 42 can be immersed below the liquid level of thiourea solution, and under the complete pressured state of spring 43 press section 42 bottom
The bottom of portion's touching fixed cup 41；
In extraction process, fixed cup 41 is put into the container 1 equipped with thiourea solution first, places into foamed plastics, so
Press section 42 is placed in fixed cup 41 afterwards, the bottom of press section 42 is contacted with thiourea solution, thus by the position of foamed plastics
It is limited to the liquid level of thiourea solution or less；It is covered in the opening of second limiter 4 with culture dish, by container 1 in boiling water
50min is heated in bath；Foamed plastics is repeatedly extruded by pressing press section 42 in extraction process；Foamed plastics and the are taken out while hot
Two limiters 4 rinse foamed plastics and second limiter 4, then the thiourea solution constant volume with 10g/L with the thiourea solution of 10g/L
Concentrated extracting solution is obtained to 50mL.
Embodiment 16-28: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that step
In rapid S3, the foamed plastics used is different, and embodiment 16-28 is respectively corresponded using the P2-P14 being prepared in embodiment 2-14
Candle ash is modified foamed plastics.
Embodiment 29: Au plasma enrichment method in a kind of soil, compared with embodiment 15, used first limiter
It is all the same with second limiter, not reinflated explanation herein；The present embodiment includes the following steps:
S1: weighing 5g soil pattern, is placed in porcelain cupel, place it in Muffle furnace with the heating rate of 5 DEG C/min from
Room temperature is warming up to 650 DEG C, keeps the temperature 1.5h, after being naturally cooling to room temperature, is transferred in container；
S2: the Fe of the 1:1 chloroazotic acid of 45mL and the 100g/L of 1mL is added in the container of step S13+Solution, cap upper surface
Ware, ebuillition of heated 3h；Heating evaporation is concentrated into acidity 10%, is diluted with water to 100mL, and an extracting solution is made, spare；
S3: the modified foamed plastics of candle ash of the 0.2g marked as P1 is added in an extracting solution of step S2, in container
It is inside put into first limiter, foamed plastics is blocked in below the liquid level an of extracting solution, is boiled and shake 60min；
S4: taking out foamed plastics, rinsed well with deionized water, dries；
S5: the thiourea solution that concentration is 12g/L is added in a reservoir, fixed cup is put into the container equipped with thiourea solution
In, foamed plastics is placed into, then press section is placed in fixed cup, the bottom of press section is contacted with thiourea solution, thus will
The position restriction of foamed plastics is below the liquid level of thiourea solution；It is covered in the opening of second limiter, container is existed
50min is heated in boiling water bath；Foamed plastics is repeatedly extruded by pressing press section in extraction process；While hot take out foamed plastics and
Second limiter rinses foamed plastics and second limiter, then the thiourea solution constant volume with 12g/L with the thiourea solution of 12g/L
Concentrated extracting solution is obtained to 50mL.
Embodiment 30: Au plasma enrichment method in a kind of soil, compared with embodiment 15, used first limiter
It is all the same with second limiter, not reinflated explanation herein；The present embodiment includes the following steps:
S1: weighing 5g soil pattern, is placed in porcelain cupel, place it in Muffle furnace with the heating rate of 5 DEG C/min from
Room temperature is warming up to 650 DEG C, keeps the temperature 1.5h, after being naturally cooling to room temperature, is transferred in container；
S2: the Fe of the 1:1 chloroazotic acid of 60mL and the 100g/L of 1mL is added in the container of step S13+Solution, cap upper surface
Ware, ebuillition of heated 1.5h；Heating evaporation is concentrated into acidity 5%, is diluted with water to 100mL, and an extracting solution is made, spare；
S3: the modified foamed plastics of candle ash of the 0.5g marked as P1 is added in an extracting solution of step S2, in container
It is inside put into first limiter, foamed plastics is blocked in below the liquid level an of extracting solution, is boiled and shake 60min；
S4: taking out foamed plastics, rinsed well with deionized water, dries；
S5: the thiourea solution that concentration is 12g/L is added in a reservoir, fixed cup is put into the container equipped with thiourea solution
In, foamed plastics is placed into, then press section is placed in fixed cup, the bottom of press section is contacted with thiourea solution, thus will
The position restriction of foamed plastics is below the liquid level of thiourea solution；It is covered in the opening of second limiter, container is existed
50min is heated in boiling water bath；Foamed plastics is repeatedly extruded by pressing press section in extraction process；While hot take out foamed plastics and
Second limiter rinses foamed plastics and second limiter, then the thiourea solution constant volume with 12g/L with the thiourea solution of 12g/L
Concentrated extracting solution is obtained to 50mL.
Embodiment 31: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 45min；Heating time is 50min in boiling water bath in step S5.
Embodiment 32: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 75min；Heating time is 50min in boiling water bath in step S5.
Embodiment 33: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 90min；Heating time is 50min in boiling water bath in step S5.
Embodiment 34: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 60min；Heating time is 30min in boiling water bath in step S5.
Embodiment 35: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 60min；Heating time is 40min in boiling water bath in step S5.
Embodiment 36: Au plasma enrichment method in a kind of soil, compared with embodiment 15, difference is only that in step S3
The concussion time be 60min；Heating time is 60min in boiling water bath in step S5.
Following comparative example is prepared as control.
Comparative example 1: Au plasma enrichment method in a kind of soil includes the following steps:
S1: weighing 5g soil pattern, is placed in porcelain cupel, place it in Muffle furnace with the heating rate of 5 DEG C/min from
Room temperature is warming up to 650 DEG C, keeps the temperature 1.5h, after being naturally cooling to room temperature, is transferred in container；
S2: the Fe of the 1:1 chloroazotic acid of 50mL and the 100g/L of 1mL is added in the container of step S13+Solution, cap upper surface
Ware, ebuillition of heated 2h；Heating evaporation is concentrated into acidity 8%, is diluted with water to 100mL, and an extracting solution is made, spare；
S3: the modified foamed plastics of candle ash of the 0.3g marked as P1 is added in an extracting solution of step S2, covers table
Face ware boils and shakes 60min；
S4: taking out foamed plastics, rinsed well with deionized water, dries；
S5: the thiourea solution that concentration is 10g/L, the foamed plastics being put into step S4, in container are added in a reservoir
Opening is covered with surface plate, and container is heated 50min in boiling water bath；Foamed plastics is taken out while hot, with the sulphur of 10g/L
Urea solution rinses foamed plastics, then is settled to 50mL with the thiourea solution of 10g/L and obtains concentrated extracting solution.
Test portion
The gold ion content tested in concentrated extracting solution using atomic absorption spectrophotometer is simultaneously calculated in soil pattern
Gold ion content；Include the following steps:
(1) preparation of test sample: the soil pattern of selection areal sampling is crushed in crusher after coarse filtration,
It is ground uniformly in mortar using after thin filtering, is extracted according to the method for embodiment 15-36, comparative example 1, concentration is made
Extracting solution is test sample；
(2) configuration of standard working curve: gold ion is diluted to respectively with 10g/L thiourea solution 5ug/L, 10ug/L,
20ug/L, 30ug/L, 40ug/L, using 10g/L thiourea solution as blank；
(3) prepared by matrix modifier (20g/L ascorbic acid): weighing 20g ascorbic acid and is dissolved in 1L distilled water；
(4) sample detection: take 20 μ l test samples respectively with 5 μ l matrix modifiers sample detection after mixing, Mei Geshi
It tests sample and tests three groups of data and be averaged, test the content of gold ion in concentrated extracting solution, and calculate containing for gold ion in soil
Amount.
(5) test result summarizes to table 2.
The content measuring result table of gold ion in 2 soil pattern of table
Analysis of experimental results: other laboratory facilities are all identical, detection accuracy is identical and do the items of three groups of parallel tests
Under part, it is believed that the concentration that detected is higher show it is higher to the extraction efficiency of the gold ion in soil.
The result of comparative example 15 and comparative example 1 is it is found that the use of first limiter and second limiter is golden to improving
The extraction efficiency of ion has critical effect, on the one hand, foamed plastics is limited in an extracting solution by first limiter
Below liquid level, increase the contact area of foamed plastics and an extracting solution, improves adsorption efficiency；Second limiter is by foamed plastics
It is limited in below the liquid level of thiourea solution and continuous crushed foam plastics is completed in bubble and in solution during the test
Fluid exchange improves extraction efficiency so that the gold ion in bubble sufficiently be extracted.
The result of comparative example 15 and embodiment 28 can be improved bubble it is found that foamed plastics is modified with candle ash
Foam plastics have stronger the absorption property of gold ion in soil because candle ash is a kind of substance with porous structure
Absorption property is improved by the modified foamed plastics porosity of candle ash, to improve the absorption property to gold ion.
The result of comparative example 15 and embodiment 27 after oversintering it is found that be used further to changing for foamed plastics for candle ash
Property, compared with the candle ash being collected into directly to be used for foamed plastics and is modified, the former is more preferable to the adsorption effect of gold ion, because
The component that is not carbonized in removal candle ash can be assisted through oversintering, more complete pore structure is formed, to improve to gold
The adsorption efficiency of ion.
The result of comparative example 15-17 is it is found that the sintering temperature of candle ash is constant, with the increasing of sintered heat insulating time
Greatly, the gold ion concentration measured is higher, shows that sintering time can influence the extraction efficiency of gold ion, is because sintering can be auxiliary
The component that is not carbonized in removal candle ash is helped, more complete pore structure is formed, to improve the adsorption efficiency to gold ion；
After soaking time increases to a certain extent, gold ion concentration is kept approximately constant.The knot of comparative example 5, embodiment 18-19
Fruit is it is found that the candle ash sintered heat insulating time is constant, and with the raising of the sintering temperature of candle ash, the gold ion concentration measured is got over
Height shows that sintering temperature can influence the extraction efficiency of gold ion, is that can assist removal candle ash because sintering temperature is higher
In the component that is not carbonized, more complete pore structure is formed, to improve the adsorption efficiency to gold ion.
Comparative example 15, the test result of embodiment 20-21 it is found that blowing temperature and foamed time to foamed plastics
Absorption property tool has a certain impact, when blowing temperature and foamed time are respectively 65 DEG C and 22min, the foam that foams
Plastics have optimal absorption property to gold ion.
Comparative example 15, the result of embodiment 22-24 are it is found that under conditions of other components content is constant, with bubble
The increase of the content of candle ash in foam plastics, the absorption property of gold ion is also continuously improved in foamed plastics, when the use of candle ash
When amount increases to 4.8 parts, saturation value is reached, i.e. foamed plastics no longer improves the absorption property of gold ion.Comparison is real
Example 15, the result of embodiment 25-26 are applied it is found that selecting the formula of embodiment 1, the foamed plastics being prepared has gold ion
Optimal absorption property.
Comparative example 15, the test result of embodiment 31-36 are it is found that adsorption time (i.e. concussion time in step S3)
It has a certain impact with desorption time (i.e. heating time in step S5) to absorption property tool of the foamed plastics to gold ion, when
Selection adsorption time is that 60min can reach preferable degree of absorption, continue growing the time pair when desorption time is 50min
The raising effect of absorption property is little.
Claims (9)
1. Au plasma enrichment method in a kind of soil, characterized in that include the following steps: S1: weighing sample, calcination is cooling
After be transferred in container；S2: the Fe of 1:1 chloroazotic acid and 95-120g/L is added in the container of step S13+Solution, chloroazotic acid and Fe3+
The volume ratio of solution is 45-60:1, ebuillition of heated 1.5-3h；Heating evaporation is concentrated into acidity in 5%-10%, is diluted with water into
Extracting solution, it is spare；S3: foamed plastics is added in an extracting solution of step S2, places first limiter in a reservoir
Thus by the position restriction of foamed plastics in the liquid level of an extracting solution hereinafter, boiling and shaking 45-90min；S4: foam is taken out
Plastics wash with water clean, drying；S5: the foamed plastics in step S4 is put into container, and concentration is added in a reservoir and is
The thiourea solution of 10-12g/L places second limiter in a reservoir thus by the position restriction of foamed plastics in thiourea solution
Below liquid level；It is covered in the opening of container, container is heated into 30-60min in boiling water bath；Foamed plastics is taken out while hot
Constant volume obtains concentrated extracting solution afterwards；Wherein, the foamed plastics is the modified foamed plastics of candle ash, is prepared as follows
It obtains: the glass cleaned up the preparation of candle ash: A1: being placed in accumulation candle ash above the candle flame being burning；Until
Candle ash accumulate to after certain thickness candle ash is collected it is spare；A2: by candle ash under the conditions of 500-600 DEG C after calcination 1-2h
Cooling is spare；A3: by step A2 candle ash and polyether polyol, diisocyanate, water, catalyst, silicon foams it is steady
Determine agent addition to be coated in the container of release agent, foam in 60-70 DEG C of baking oven after mixing under stiring, foamed time is
20-25min；In parts by weight, the content of each component is as follows: candle ash: 1.6-6.4 parts；Polyether polyol: 20-25 parts；Two
Isocyanates: 45-60 parts；Water: 3.0-3.4 parts；Catalyst: 1.5-2.5 parts；Organic foam stabilizer: 0.5-0.65 parts；
A4: demoulding cleans up the modified bubble of rear drying to obtain candle ash with ethyl alcohol, isopropanol, dish washing liquid and water after cutting foam
Foam plastics.
2. Au plasma enrichment method in a kind of soil according to claim 1, it is characterized in that: the first limiter packet
Fixed part, blocking portion and the interconnecting piece for connecting portion and blocking portion are included, the fixed part is overlapped in the opening of container,
The blocking portion is equipped with leak hole, and the size of the leak hole is less than foamed plastics.
3. Au plasma enrichment method in a kind of soil according to claim 2, it is characterized in that: the second limiter packet
Include fixed cup and the press section in fixed cup, the fixed cup upper end is overlapped in the opening of container, the press section and
Spring is equipped between fixed cup, the spring is fixed with any one in fixed cup or press section；The bottom of the fixed cup
Equipped with leak hole, gap is equipped between the press section and the bottom of fixed cup, the size in gap is at least the size of foamed plastics.
4. Au plasma enrichment method in a kind of soil according to claim 3, it is characterized in that: the press section is cup-shaped
Setting, the outer wall and fixed cup internal wall transitions of the press section cooperate；The bottom of the press section is equipped with leak hole, the leak hole
Size is less than foamed plastics.
5. Au plasma enrichment method in a kind of soil according to claim 4, it is characterized in that: including the following steps: S1:
Sample is weighed, calcination is transferred in container after cooling；S2: the Fe of 1:1 chloroazotic acid and 100g/L is added in the container of step S13+
Solution, chloroazotic acid and Fe3+The volume ratio of solution is 50:1, ebuillition of heated 1.5-3h；Heating evaporation is concentrated into acidity in 5%-10%,
It is diluted with water Cheng Yici extracting solution, it is spare；S3: foamed plastics is added in an extracting solution of step S2, is put into container
Foamed plastics is blocked in below the liquid level an of extracting solution, boils and shake 45-90min by first limiter；S4: bubble is taken out
Foam plastics wash with water clean, drying；S5: the thiourea solution that concentration is 10-12g/L is added in a reservoir, first by fixed cup
It is put into container, places into the foamed plastics in step S4, then press section is placed in fixed cup, the bottom of press section and sulphur
Urea solution contact, thus by the position restriction of foamed plastics below the liquid level of thiourea solution；By by extrusion in extraction process
Splenium repeatedly extrudes foamed plastics；It is covered in the opening of container, container is heated into 30-60min in boiling water bath；While hot
Constant volume obtains concentrated extracting solution after taking out foamed plastics.
6. Au plasma enrichment method in a kind of soil according to claim 1 or 4, it is characterized in that: in the step S1,
The technique of calcination is to be warming up to 650 DEG C from room temperature with the heating rate of 5 DEG C/min in Muffle furnace, keeps the temperature 1.5h, Temperature fall.
7. Au plasma enrichment method in a kind of soil according to claim 1 or 4, it is characterized in that: in the step S3,
The addition mass ratio of the foamed plastics and an extracting solution is 2-5:1000.
8. Au plasma enrichment method in a kind of soil according to claim 1, it is characterized in that: the calcination of the step A2
Technique are as follows: be warming up to 200 DEG C with the heating rate of 5 DEG C/min, keep the temperature 30min, continuation is warming up to the heating rate of 5 DEG C/min
500-600 DEG C, keep the temperature 1-2h, cooled to room temperature.
9. Au plasma enrichment method in a kind of soil according to claim 1, it is characterized in that: in the step A3, wax
Candle ash is mixed with polyether polyol first, ultrasonic wave added dispersion, then is mixed with other components.
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