CN106495110B - A kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder - Google Patents
A kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder Download PDFInfo
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- CN106495110B CN106495110B CN201610882129.9A CN201610882129A CN106495110B CN 106495110 B CN106495110 B CN 106495110B CN 201610882129 A CN201610882129 A CN 201610882129A CN 106495110 B CN106495110 B CN 106495110B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/01—Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds
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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
- C22B17/00—Obtaining cadmium
- C22B17/04—Obtaining cadmium by wet processes
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- 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 a kind of effective methods for reducing cadmium content in rock phosphate in powder.Rock phosphate in powder crushing is sieved with 100 mesh sieve first, according to solid-to-liquid ratio 1:5‑1:The ratio of 20 (g/mL) adds in mass concentration as 0.1% 0.5% hydrogen peroxide, fully vibrates；After separation of solid and liquid, then into residual solids according to solid-to-liquid ratio 1:10‑1:The ratio of 100 (g/mL) adds in the EDTA complexing agents of 0.1mol/L, fully vibrates, and after separation of solid and liquid, residual solids are dried under 105 degree, that is, obtains the significantly reduced rock phosphate in powder product of cadmium content.Since this method using hydrogen peroxide pre-oxidizes the organic matter in rock phosphate in powder, the combination of cadmium and organic matter is destroyed；Next cadmium is extracted using EDTA complexing agents powerful complexing power again, so as to be effectively reduced the cadmium content in rock phosphate in powder.This method is easy to operate, and the removal efficiency of cadmium is high, by effectively reducing the content of cadmium in rock phosphate in powder, is expected to reduce the cadmium in later stage phosphate fertilizer product, and then preserve the ecological environment and be of great significance, therefore this method has very big application potential.
Description
Technical field
Invention is related to a kind of processing method of rock phosphate in powder, more specifically a kind of joint hydrogen peroxide pre-oxidation and EDTA networks
The method that mixture extracts to reduce heavy metal cadmium content in rock phosphate in powder.
Background technology
Phosphorus ore is a kind of limited, non-renewable strategic resource, and most phosphate rock resources is used to produce phosphate fertilizer, and
It is applied in soil to increase crop yield.However, rock phosphate in powder usually contains a variety of harmful elements, as cadmium (Cd), arsenic (As),
Chromium (Cr), fluorine (F), lead (Pb), selenium (Se) and mercury (Hg) etc., wherein again with the content highest of cadmium.In wet process phosphatic fertilizer process
In, the cadmium of 70-80% is eventually transferred into phosphate fertilizer in rock phosphate in powder.Cadmium has become an important factor for restricting phosphate fertilizer quality.Both at home and abroad
Many studies have shown that long-term application of P fertilizer can result in heavy metal-polluted soil especially Cadmium accumulation, become farmland soil using phosphate fertilizer
The important sources of earth cadmium pollution.China's agricultural land soil generally lacks phosphorus, thus long-term, largely more universal using phosphate fertilizer, thus band
Carrying out Cadmium accumulation in soil not only reduces crop yield and quality, moreover it is possible to endanger human health by food chain.Therefore, it is producing
During phosphate fertilizer, the content for trying to reduce cadmium in raw material rock phosphate in powder is of great significance.
At present, the rock phosphate in powder about 88% of phosphate fertilizer consumption comes from sedimentary rock in the world, remaining comes from igneous rock, and I
More than 80% state's phosphorus ore is sedimentary rock ore deposit.In general, the rock phosphate in powder cadmium content for coming from sedimentary rock is significantly higher than igneous rock.Reason
It is in the rock phosphate in powder of sedimentary rock the often organic matter containing higher amount, and cadmium can strongly be combined with organic matter, from
And cause rock phosphate in powder containing cadmium very universal.The phosphate fertilizer long-time service of these rocks phosphate in powder production will make heavy metal cadmium largely accumulate simultaneously band
Carry out severe environments risk.At present, the method for removing cadmium in rock phosphate in powder can be divided into two clocks.One kind be before rock phosphate in powder is processed,
The cadmium content of rock phosphate in powder is reduced with calcination method；Another kind is using gypsum cocrystallization method, sulfuric acid in wet process phosphatic fertilizer process
Salt precipitation method, ion-exchange, membrane separation process and solvent extraction etc. reduce the cadmium content in phosphoric acid.However these methods are often
Cost is higher, it is also possible to cause the solution loss of phosphorus, and bad to the removal effect of cadmium.Therefore there is an urgent need to seek effectively to reduce
The new method of cadmium content in rock phosphate in powder.
Switzerland《Advanced material is studied》Magazine (Advanced Materials Research, 1994, the 1-2 volumes,
155-162 pages) it reports and adds the method for ammonium chloride, calcium chloride and sodium chloride at high temperature to remove the cadmium in rock phosphate in powder.Australia
Big Leah chemical fertilizer industry federation (Fertilizer Industry Federation of Australia, Inc.,
Conference,Progress in the development of decadmiation of phosphorous
Fertilizers, 2001, the 101-106 pages) to point out gypsum cocrystallization method be most promising one in various method for removing cadmium
Kind, but the cost (beautiful yuan/ton of 20-45) that this method is higher limits its application.JMSM material science proceedings
(Proceedings of the JMSM 2008Conference, Physics Procedia, 2009, volume 2,1455-
Page 1460) it reports and utilizes hydrochloric acid, Na2The method that-EDTA and acetic acid reduce cadmium content in rock phosphate in powder respectively as extractant.
5th Black Sea basin analysis chemistry meeting (5th Black Sea Basin Conference on Analytical
Chemistry, 2009, article number PPI-9 (Ab18)) it reports and is made respectively using EDTA, calcium chloride, oxalic acid and tartaric acid
The method that cadmium content in rock phosphate in powder is reduced for extractant.Saudi Arabia《Arabic chemistry》Magazine (Arabian Journal
Of Chemistry, 2011, doi:10.1016/j.arabjc.2011.05.016) report microwave-excitation and Na2-EDTA
The method that United Technologies reduce cadmium content in rock phosphate in powder.Poland《Polish chemical technology》Magazine (Polish Journal of
Chemical Technology, 2012, volume 14, the 3rd phase, the 15-20 pages) it reports and utilizes Na2- EDTA, citric acid,
Tartaric acid, ammonium citrate, calcium chloride, ammonium acetate, ammonium chloride, oxalic acid and ammonium hydroxide reduce cadmium in rock phosphate in powder respectively as extractant
The method of content.The U.S.《Separation science and technology》Magazine (2016, volume 51, the 4th phase, the 718-726 pages) report leaching
Carrying reduces the method for cadmium content in rock phosphate in powder with electrodialysis United Technologies.The studies above is desirable with the powerful complexing energy of extractant
Power extracts the cadmium in rock phosphate in powder, but it is opposite have ignored existing forms of the cadmium in rock phosphate in powder, due to the cadmium master in rock phosphate in powder
To exist with organically combine state, it is difficult to directly be extracted by complexing agent.Therefore it is reduced using the method that complexing agent directly extracts
Cadmium content is ineffective in rock phosphate in powder.It is not retrieved also using hydrogen peroxide pre-oxidation treatment rock phosphate in powder before the present patent application, and
Joint EDTA microwave leaching technologies for reducing the method for cadmium content in rock phosphate in powder pertinent literature.
Invention content
1. technical problems to be solved by the inivention
It is difficult to destroy the combination of cadmium and organic matter in rock phosphate in powder for the prior art, can not effectively extract in rock phosphate in powder
Cadmium, the object of the present invention is to provide a kind of methods for reducing heavy metal cadmium content in rock phosphate in powder, and this method can will be in rock phosphate in powder
Cadmium extract, achieve the purpose that reduce rock phosphate in powder cadmium content.
2. technical solution
The principle of the present invention：Hydrogen peroxide pre-oxidation can remove the organic matter in rock phosphate in powder, destroy the knot of cadmium and organic matter
It closes, there is following EDTA complexing agents extremely strong complexing power can effectively extract cadmium, so as to reduce phosphorus ore
The content of cadmium in stone.
In order to achieve the above objectives, technical solution provided by the invention is：
A kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder pre-oxidizes removal organic matter by hydrogen peroxide, breaks
The combination of bad cadmium and organic matter, and then extract cadmium using EDTA complexing agents.
A kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder, step are：
(1) rock phosphate in powder used is crushed, and leads to and sieve with 100 mesh sieve, it is spare no more than the ground phosphate rock of 0.15mm to obtain granularity.
(2) according to the ratio 1 of ground phosphate rock quality and dioxygen water volume:5-1:20 (g/mL), add in a concentration of 0.1%-
0.5% hydrogen peroxide.
(3) hydrogen peroxide and ground phosphate rock mixed liquor are stirred at room temperature or vibrated 24 hours, after separation of solid and liquid, residual solids
It is spare.
(4) according to above-mentioned solid masses and the ratio 1 of EDTA complexing agent volumes:10-1:100 (g/mL) are added in a concentration of
The EDTA complexing agents of 0.05-0.2mol/L.
(5) above-mentioned mixed liquor is stirred at room temperature or vibrated 24 hours, after separation of solid and liquid, residual solids are dry in 105 degree
It is dry, you can to obtain the rock phosphate in powder that cadmium content reduces.
Preferably, the rock phosphate in powder cadmium content described in step (1) is in 1.0-232mg/kg.
Preferably, the EDTA complexing agents described in step (4) can be EDTA, Na2- EDTA or K2-EDTA。
3. advantageous effect
The invention discloses a kind of effective methods for reducing heavy metal cadmium content in rock phosphate in powder, utilize the pre- oxygen of hydrogen peroxide
Change the method that joint EDTA extractive techniques effectively reduce cadmium content in rock phosphate in powder, there is following effect：
(1) hydrogen peroxide is a kind of common oxidant, and raw material is easy to get, high treating effect；
(2) rock phosphate in powder after pre-oxidation treatment, cadmium therein are easier to be extracted by complexing agent；
(3) this method is of low cost compared with high-temperature process rock phosphate in powder method for removing cadmium, program is easy；It is directly extracted with other
Method is compared, as a result of pre-oxidation treatment, to the extraction effect of cadmium more preferably.
Description of the drawings
Fig. 1 is the operating process of this method.
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment, the present invention is described in detail.
Embodiment 1
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide that 50mL mass concentrations are 0.1% is added in, stirs or vibrates 24 hours, separation of solid and liquid will be residual
Solid is stayed to be transferred in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stirring or oscillation 24
Hour, separation of solid and liquid, residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.318mg/kg) reduces by 68.2% phosphorus ore
Stone.
Embodiment 2
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide that 50mL mass concentrations are 0.5% is added in, stirs or vibrates 24 hours, separation of solid and liquid will be residual
Solid is stayed to be transferred in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stirring or oscillation 24
Hour, separation of solid and liquid, residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.273mg/kg) reduces by 72.7% phosphorus ore
Stone.
Embodiment 3
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.2% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.2mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.259mg/kg) reduces by 74.1% rock phosphate in powder.
Embodiment 4
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.05mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.306mg/kg) reduces by 69.4% rock phosphate in powder.
Embodiment 5
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.5mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.251mg/kg) reduces by 74.9% rock phosphate in powder.
Embodiment 6
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.162mg/kg) reduces by 83.8% rock phosphate in powder.
Embodiment 7
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.286mg/kg) reduces by 71.4% rock phosphate in powder.
Embodiment 8
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.246mg/kg) reduces by 75.6% rock phosphate in powder.
Embodiment 9
Rock phosphate in powder sample 1 (cadmium content 1.0mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (0.155mg/kg) reduces by 84.5% rock phosphate in powder.
Embodiment 10
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (18.795mg/kg) reduces by 46.3% rock phosphate in powder.
Embodiment 11
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (17.885mg/kg) reduces by 48.9% rock phosphate in powder.
Embodiment 12
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (16.975mg/kg) reduces by 51.5% rock phosphate in powder.
Embodiment 13
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (18.305mg/kg) reduces by 47.7% rock phosphate in powder.
Embodiment 14
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (17.22mg/kg) reduces by 50.8% rock phosphate in powder.
Embodiment 15
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (16.66mg/kg) reduces by 52.4% rock phosphate in powder.
Embodiment 16
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (16.975mg/kg) reduces by 51.5% rock phosphate in powder.
Embodiment 17
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (16.17mg/kg) reduces by 53.8% rock phosphate in powder.
Embodiment 18
Rock phosphate in powder sample 2 (cadmium content 35mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (14.455mg/kg) reduces by 58.7% rock phosphate in powder.
Embodiment 19
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (195.8mg/kg) reduces by 15.6% rock phosphate in powder.
Embodiment 20
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (187mg/kg) reduces by 19.4% rock phosphate in powder.
Embodiment 21
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 50mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (176.1mg/kg) reduces by 24.1% rock phosphate in powder.
Embodiment 22
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid shifts residual solids
Into 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, solid-liquid
Separation, residual solids are in 105 degree of dryings, you can obtaining cadmium content (188.2mg/kg) reduces by 18.9% rock phosphate in powder.
Embodiment 23
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (179.8mg/kg) reduces by 22.5% rock phosphate in powder.
Embodiment 24
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 100mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (167.5mg/kg) reduces by 27.8% rock phosphate in powder.
Embodiment 25
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:10 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (178.2mg/kg) reduces by 23.2% rock phosphate in powder.
Embodiment 26
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:50 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (165mg/kg) reduces by 28.9% rock phosphate in powder.
Embodiment 27
Rock phosphate in powder sample 3 (cadmium content 232mg/kg) is taken, crushed and is sieved with 100 mesh sieve.Weigh the 10g rock phosphate in powder product in
In 500mL conical flasks, the hydrogen peroxide of 200mL 0.1% is added in, stir or is vibrated 24 hours, separation of solid and liquid, residual solids are turned
It moves on in 1 liter of beaker, by solid-to-liquid ratio 1:100 (g/mL) add in the EDTA complexing agents of 0.1mol/L, stir or vibrate 24 hours, Gu
Liquid detaches, and residual solids are in 105 degree of dryings, you can obtaining cadmium content (158.2mg/kg) reduces by 31.8% rock phosphate in powder.
Above-described embodiment is schematically described the invention and embodiments thereof, and there is no limit for the description
Property.So if those of ordinary skill in the art are enlightened by it, in the case where not departing from this creation objective, without creation
The protection domain designed the frame mode similar to the technical solution and embodiment, this patent should all be belonged to of property.
Claims (4)
- A kind of 1. effective method for reducing heavy metal cadmium content in rock phosphate in powder, it is characterised in that：It is pre-oxidized and removed by hydrogen peroxide Organic matter and EDTA complexing agents extract cadmium, and step is：（1）Rock phosphate in powder used is crushed, and leads to and sieves with 100 mesh sieve, it is spare no more than the ground phosphate rock of 0.15mm to obtain granularity；（2）According to the ratio 1 of ground phosphate rock quality and dioxygen water volume:5-1:20g/mL, it is 0.1%-0.5%'s to add in mass concentration Hydrogen peroxide；（3）Hydrogen peroxide and ground phosphate rock mixed liquor are stirred at room temperature or vibrated no less than 24 hours, after separation of solid and liquid, residual is solid Body is spare；（4）According to above-mentioned solid masses and the ratio 1 of EDTA complexing agent volumes:10-1:100g/mL adds in a concentration of 0.05- The EDTA complexing agents of 0.2mol/L；（5）Above-mentioned mixed liquor is stirred at room temperature or is vibrated no less than 24 hours, after separation of solid and liquid, residual solids drying obtains The rock phosphate in powder effectively reduced to cadmium content.
- 2. a kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder according to claim 1, it is characterised in that： Step（1）Described in rock phosphate in powder cadmium content in 1.0-232 mg/kg.
- 3. a kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder according to claim 1, it is characterised in that：Step Suddenly（4）Described in EDTA complexing agents be EDTA, Na2- EDTA or K2-EDTA。
- 4. a kind of effective method for reducing heavy metal cadmium content in rock phosphate in powder according to any one of claim 1-3, It is characterized in that：After processing, cadmium content reduces 15.6%-84.5%.
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| CN105032910A (en) * | 2015-06-12 | 2015-11-11 | 湖南大学 | Composite eluting agent for repairing arsenic contaminated soil and application method thereof |
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| CN105032910A (en) * | 2015-06-12 | 2015-11-11 | 湖南大学 | Composite eluting agent for repairing arsenic contaminated soil and application method thereof |
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