CN105936508A - Method for extracting silica from ore slag - Google Patents
Method for extracting silica from ore slag Download PDFInfo
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- CN105936508A CN105936508A CN201610381980.3A CN201610381980A CN105936508A CN 105936508 A CN105936508 A CN 105936508A CN 201610381980 A CN201610381980 A CN 201610381980A CN 105936508 A CN105936508 A CN 105936508A
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- silicon dioxide
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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
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
The invention discloses a method for extracting silica from ore slag. The method comprises the following steps: 1, introducing oxygen to the ore slag, sequentially carrying out primary roasting, secondary roasting and tertiary roasting, and cooling the three-roasted ore slag to obtain a material a; 2, fusing the material a and sodium carbonate, and carrying out water quenching to obtain fine articles; 3, carrying out wet grinding on the fine particles to form a thick slurry, carrying out multi-step alkali dissolving, and filtering the obtained solution to obtain a filtrate which is a material b; 4, introducing carbon dioxide to the material b, and filtering the material b to obtain a filtrate which is a material c; 5, adding ethyl acetate to the material c in a dropwise manner, adding a sulfuric acid solution, centrifuging the obtained solution, taking the obtained filtrate, washing the filtrate with distilled water, drying the washed material in a drying box, and cooling the dried material at room temperature to obtain silica. The purity of the obtained silica reaches 98% or above.
Description
Technical field
The present invention relates to a kind of extracting method, a kind of method particularly relating to extract silicon dioxide in slag.
Background technology
Ore residue after ore dressing or smelting is referred to as slag, containing units such as abundant aluminum and silicon in slag
Element, and silicon dioxide is had many uses general, is mainly used in glass processed, waterglass, pottery, enamel, fire proofed wood
Material, aerogel blanket, ferrosilicon, molding sand, elemental silicon, cement etc., the huge market demand, hence with slag
In element silicon to extract silicon dioxide be the problem that at present technology needs solution badly.
Summary of the invention
For solving technical problem present in background technology, the present invention proposes to extract silicon dioxide in a kind of slag
Method, technological process is simple to operation, low cost, and the silica purity that obtains is high, the efficiency of extraction
Good.
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, is then passed through oxygen, carries out a roasting successively,
After baking and three roastings, be cooled to room temperature and obtain material a；
S2, material a is mixed homogeneously with sodium carbonate after put in stove and melt, obtain molten mass, then
By molten mass shrend, obtain fine grained material；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Taking a filter cake sodium hydroxide solution A to dissolve, then heat concentration, baking is dried to obtain dry
Powder, by dry mash water dissolution, is filtrated to get secondary filtrate and secondary filter cake；Then secondary filter cake is used
Sodium hydroxide solution B dissolves, and filters, obtains three filtrates and three filter cakes；By first-time filtrate, secondary filter
Liquid and three filtrates merge, and dilute with water filters, takes filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, takes filtrate after filtration and obtain material c；
S5, ethyl acetate is added drop-wise in material c, does not stop stirring during dropping, be subsequently adding sulphuric acid
Solution, centrifugation takes filtrate, then uses distilled water wash filtrate, and the material after washing is placed on drying baker
In be dried, be cooled to room temperature and obtain silicon dioxide.
Preferably, in S1, the temperature of a roasting is 280-350 DEG C, and the time of a roasting is 1-3h；
The temperature of after baking is 500-550 DEG C, and the time of after baking is 2-4h；The temperature of three roastings is
600-650 DEG C, the time of three roastings is 0.5-1.5h.
Preferably, in S2, melt putting in stove after material a and sodium carbonate mix homogeneously, melted temperature
Degree is for 1150-1350 DEG C, and the melting time is 30-40min, obtains the molten mass of 1050-1150 DEG C, then will
Molten mass shrend, obtains fine grained material.
Preferably, in S2, the weight ratio of material a and sodium carbonate is 1:1.2-1.8.
Preferably, in S2, the particle diameter of fine grained material is 1-5mm.
Preferably, in S3, the fine grained material wet grinding obtained by S2 becomes thick slurry, dilutes, is filtrated to get one
Secondary filtrate and a filter cake；Take a filter cake sodium hydroxide solution A in 70-80 DEG C of dissolving, then heat dense
Contracting, bakees and is dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter cake；
Then by secondary filter cake with sodium hydroxide solution B in 65-85 DEG C of dissolving, filter, obtain three filtrates and three times
Filter cake；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water, filter, take filtrate and obtain
Material b.
Preferably, in S3, the concentration of sodium hydroxide solution A is 45-55wt%；Sodium hydroxide solution B's is dense
Degree is 65-75wt%.
Preferably, in S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 5.2-6.3,
Take filtrate after filtration and obtain material c.
Preferably, in S5, the mass ratio of ethyl acetate, material c and sulfuric acid solution is 5-15:2-8:3-9.
Preferably, in S5, the concentration of sulfuric acid solution is 28-32wt%.
Preferably, in S5, the time of washing is 20-50min.
Preferably, in S5, the temperature being dried is 80-120 DEG C, and the time being dried is 1-5h.
In the present invention, in S1, the oxygen being passed through is as the calcined gas of carbon removing step, as those skilled in the art
Routine techniques means, therefore the consumption of oxygen does not limits in the present invention.
In S3, the carbon dioxide being passed through regulates gas as acidity, as the conventional skill of those skilled in the art
Art means, its consumption does not limits, therefore the consumption of carbon dioxide does not limits in the present invention.
In the present invention, with slag as major ingredient, first slag is carried out a point benefit calcining, removes the carbon in slag,
By adding sodium carbonate fusion after making carbon fully remove, it is to allow the SiO in slag2And Al2O3With Na2CO3
Reaction transforms into solvable Na2O·SiO2And Na2O·Al2O3, separate with other compositions in slag, soda
Na newly-generated when alkali melts2O·Al2O3·2SiO2It is easy to be decomposed by NaOH, discharges Na2O·Al2O3With
Na2O·SiO2。Na2O·Al2O3Meet water can part hydrolyze, produce Al (OH)3With NaOH；Na2O·Fe2O3
Meet water all to hydrolyze, produce Fe (OH)3With NaOH.It is dissolved in water by wet grinding and to the underflow material after wet grinding,
Na2O·Al2O3And Na2O·Fe2O3NaOH and Na that hydrolysis produces2O·Al2O3·2SiO2Reaction, part
Na2O·Al2O3·2SiO2It is decomposed into Na2O·Al2O3And Na2O·SiO2It is dissolved in water and enters solution.Cross
After filter, the Na of dissolving2O·Al2O3And Na2O·SiO2With comprise unreacted Na2O·Al2O3·2SiO2Solid
And Fe (OH)3, part Al (OH)3Impurity solid separate in advance.Filter cake after wet grinding, dissolving adds
Caustic soda NaOH solution baking are dried to dry mash, and NaOH is by filter cake in its effect
Na2O·Al2O3·2SiO2All it is decomposed into Na2O·Al2O3And Na2O·SiO2.Meanwhile, the Al in filter cake (OH)3
With Fe (OH)3Also Na is again changed into2O·Al2O3And Na2O·Fe2O3。SiO2At Na2O·Al2O3In solution
Stabilizing dissolved degree the lowest, excess SiO2Meeting and Na2O·Al2O3Generate Na2O·Al2O3·2SiO2Precipitation,
Make Al2O3With SiO2Extraction ratio reduce, Na2O alkaline consumption increases.After dry powder dissolves, Na2O·Al2O3And Na2O·SiO2
It is fully dissolved in water, part Na2O·Al2O3Hydrolyze, produce Al (OH)3With NaOH；Na2O·Fe2O3Entirely
Portion hydrolyzes, and produces Fe (OH)3With NaOH.The NaOH that hydrolysis produces can strengthen again SiO further2In the solution
Molten stability of solution.Solution after being dissolved by dry powder filters and separates, except impurity in filter cake, and also part
Al(OH)3.Dissolve the filter cake after dry powder dissolves with soda bath, make the Al (OH) in filter cake3React with NaOH
Change into Na2O·Al2O3Dissolve and enter solution and magazins' layout.Filtrate CO after dilution hydrolysis2Gas pressurized
Carry out carbonating process, neutralize NaOH, reduce the pH value of solution, make remaining Na in solution2O·Al2O3
Almost all hydrolysis becomes Al (OH)3Precipitation.Isolate Al (OH)3After, solution becomes Na2CO3And NaHSiO3
Mixed solution.Continue Na2CO3And NaHSiO3Mixed solution CO2Gas pressurized carries out carbonating process, fall
The pH value of low solution, makes NaHSiO in solution3Almost all hydrolysis becomes H2SiO3Precipitation.Isolate H2SiO3
After, solution becomes dilute Na2CO3Solution.The technological process of the present invention is simple to operation, low cost, two obtained
Silicon oxide purity is high, and the purity of silicon dioxide has reached more than 98%.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method extracting silicon dioxide in a kind of slag that the present invention proposes.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail, it should be appreciated that embodiment is served only for
The bright present invention rather than be used for limiting the invention, any made on the basis of the present invention amendment,
Equivalents etc. are the most within the scope of the present invention.
As it is shown in figure 1, a kind of slag that Fig. 1 is the present invention to be proposed extracts the flow process of the method for silicon dioxide
Schematic diagram.
With reference to Fig. 1, the method extracting silicon dioxide in a kind of slag that the present invention proposes, comprise the steps:
S1, slag is put in reactor, in reactor, is then passed through oxygen, carries out a roasting successively,
After baking and three roastings, be cooled to room temperature and obtain material a；
S2, material a is mixed homogeneously with sodium carbonate after put in stove and melt, obtain molten mass, then
By molten mass shrend, obtain fine grained material；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Taking a filter cake sodium hydroxide solution A to dissolve, then heat concentration, baking is dried to obtain dry
Powder, by dry mash water dissolution, is filtrated to get secondary filtrate and secondary filter cake；Then secondary filter cake is used
Sodium hydroxide solution B dissolves, and filters, obtains three filtrates and three filter cakes；By first-time filtrate, secondary filter
Liquid and three filtrates merge, and dilute with water filters, takes filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, takes filtrate after filtration and obtain material c；
S5, ethyl acetate is added drop-wise in material c, does not stop stirring during dropping, be subsequently adding sulphuric acid
Solution, centrifugation takes filtrate, then uses distilled water wash filtrate, and the material after washing is placed on drying baker
In be dried, be cooled to room temperature and obtain silicon dioxide.
Embodiment 1
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, be then passed through oxygen, carry out a roasting, one
The temperature of secondary roasting is 315 DEG C, and the time of a roasting is 2h, and a roasting continues to be passed through oxygen after terminating,
Carrying out after baking, the temperature of after baking is 525 DEG C, and the time of after baking is 3h, and after baking is tied
Continuing after bundle to be passed through oxygen, carry out three roastings, the temperature of three roastings is 625 DEG C, the time of three roastings
For 1h, it is cooled to room temperature and obtains material a；
S2, melt putting in stove after 1 part of material a and 1.5 parts of sodium carbonate mix homogeneously by weight,
Melt temperature is 1200 DEG C, and the melting time is 35min, obtains the molten mass of 1100 DEG C, then by molten mass
Shrend, obtains the fine grained material that particle diameter is 3mm；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Take filter cake concentration be the sodium hydroxide solution A of 50wt% in 75 DEG C of dissolvings, then heat
Concentrate, bakee and be dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter
Cake；Then by sodium hydroxide solution B that secondary filter cake concentration is 70wt% in 75 DEG C of dissolvings, filter,
To three filtrates and three filter cakes；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water,
Filter, take filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 5.75, take filtrate after filtration and obtain
To material c；
S5, by weight 10 parts of ethyl acetate are added drop-wise in 5 parts of material c, do not stop during dropping to stir
Mixing, being subsequently adding 6 parts of concentration is the sulfuric acid solution of 30wt, and centrifugation takes filtrate, then with distillation washing
Washing filtrate, wash time is 35min, is placed in drying baker by the material after washing and is dried, and baking temperature is
100 DEG C, drying time is 3h, is cooled to room temperature and obtains silicon dioxide.
Embodiment 2
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, be then passed through oxygen, carry out a roasting, one
The temperature of secondary roasting is 280 DEG C, and the time of a roasting is 3h, and a roasting continues to be passed through oxygen after terminating,
Carrying out after baking, the temperature of after baking is 500 DEG C, and the time of after baking is 4h, and after baking is tied
Continuing after bundle to be passed through oxygen, carry out three roastings, the temperature of three roastings is 600 DEG C, the time of three roastings
For 1.5h, it is cooled to room temperature and obtains material a；
S2, melt putting in stove after 1 part of material a and 1.2 parts of sodium carbonate mix homogeneously by weight,
Melt temperature is 1350 DEG C, and the melting time is 30min, obtains the molten mass of 1150 DEG C, then by molten mass
Shrend, obtains the fine grained material that particle diameter is 1mm；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Take filter cake concentration be the sodium hydroxide solution A of 45wt% in 80 DEG C of dissolvings, then heat
Concentrate, bakee and be dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter
Cake；Then by sodium hydroxide solution B that secondary filter cake concentration is 65wt% in 85 DEG C of dissolvings, filter,
To three filtrates and three filter cakes；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water,
Filter, take filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 5.2, take filtrate after filtration and obtain
To material c；
S5, by weight 5 parts of ethyl acetate are added drop-wise in 8 parts of material c, do not stop during dropping to stir
Mixing, being subsequently adding 3 parts of concentration is the sulfuric acid solution of 28wt%, and centrifugation takes filtrate, then uses distilled water
Wash filtrate, the time of washing is 20min, is placed in drying baker by the material after washing and is dried, the temperature being dried
Degree is 120 DEG C, and the time being dried is 1h, is cooled to room temperature and obtains silicon dioxide.
Embodiment 3
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, be then passed through oxygen, carry out a roasting, one
The temperature of secondary roasting is 350 DEG C, and the time of a roasting is 1h, and a roasting continues to be passed through oxygen after terminating,
Carrying out after baking, the temperature of after baking is 550 DEG C, and the time of after baking is 2h, and after baking is tied
Continuing after bundle to be passed through oxygen, carry out three roastings, the temperature of three roastings is 650 DEG C, the time of three roastings
For 0.5h, it is cooled to room temperature and obtains material a；
S2, melt putting in stove after 1 part of material a and 1.8 parts of sodium carbonate mix homogeneously by weight,
Melt temperature is 1150 DEG C, and the melting time is 40min, obtains the molten mass of 1050 DEG C, then by molten mass
Shrend, obtains the fine grained material that particle diameter is 5mm；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Take filter cake concentration be the sodium hydroxide solution A of 45wt% in 80 DEG C of dissolvings, then heat
Concentrate, bakee and be dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter
Cake；Then by sodium hydroxide solution B that secondary filter cake concentration is 65wt% in 85 DEG C of dissolvings, filter,
To three filtrates and three filter cakes；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water,
Filter, take filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 6.3, take filtrate after filtration and obtain
To material c；
S5, by weight 15 parts of ethyl acetate are added drop-wise in 2 parts of material c, do not stop during dropping to stir
Mixing, being subsequently adding 9 parts of concentration is the sulfuric acid solution of 32wt%, and centrifugation takes filtrate, then uses distilled water
Wash filtrate, the time of washing is 50min, is placed in drying baker by the material after washing and is dried, the temperature being dried
Degree is 80 DEG C, and the time being dried is 5h, is cooled to room temperature and obtains silicon dioxide.
Embodiment 4
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, be then passed through oxygen, carry out a roasting, one
The temperature of secondary roasting is 300 DEG C, and the time of a roasting is 2.5h, and a roasting continues to be passed through oxygen after terminating,
Carrying out after baking, the temperature of after baking is 510 DEG C, and the time of after baking is 3.5h, and after baking is tied
Continuing after bundle to be passed through oxygen, carry out three roastings, the temperature of three roastings is 610 DEG C, the time of three roastings
For 1.2h, it is cooled to room temperature and obtains material a；
S2, melt putting in stove after 1 part of material a and 1.3 parts of sodium carbonate mix homogeneously by weight,
Melt temperature is 1300 DEG C, and the melting time is 32min, obtains the molten mass of 1120 DEG C, then by molten mass
Shrend, obtains the fine grained material that particle diameter is 2mm；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Take filter cake concentration be the sodium hydroxide solution A of 48wt% in 78 DEG C of dissolvings, then heat
Concentrate, bakee and be dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter
Cake；Then by sodium hydroxide solution B that secondary filter cake concentration is 68wt% in 82 DEG C of dissolvings, filter,
To three filtrates and three filter cakes；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water,
Filter, take filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 5.5, take filtrate after filtration and obtain
To material c；
S5, by weight 8 parts of ethyl acetate are added drop-wise in 6 parts of material c, do not stop during dropping to stir
Mixing, being subsequently adding 4 parts of concentration is the sulfuric acid solution of 29wt%, and centrifugation takes filtrate, then uses distilled water
Wash filtrate, the time of washing is 25min, is placed in drying baker by the material after washing and is dried, the temperature being dried
Degree is 115 DEG C, and the time being dried is 2h, is cooled to room temperature and obtains silicon dioxide.
Embodiment 5
The method extracting silicon dioxide in a kind of slag that the present invention proposes, comprises the steps:
S1, slag is put in reactor, in reactor, be then passed through oxygen, carry out a roasting, one
The temperature of secondary roasting is 330 DEG C, and the time of a roasting is 1.5h, and a roasting continues to be passed through oxygen after terminating,
Carrying out after baking, the temperature of after baking is 540 DEG C, and the time of after baking is 2.5h, and after baking is tied
Continuing after bundle to be passed through oxygen, carry out three roastings, the temperature of three roastings is 640 DEG C, the time of three roastings
For 0.8h, it is cooled to room temperature and obtains material a；
S2, melt putting in stove after 1 part of material a and 1.7 parts of sodium carbonate mix homogeneously by weight,
Melt temperature is 1200 DEG C, and the melting time is 38min, obtains the molten mass of 1080 DEG C, then by molten mass
Shrend, obtains the fine grained material that particle diameter is 4mm；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Take filter cake concentration be the sodium hydroxide solution A of 48wt% in 78 DEG C of dissolvings, then heat
Concentrate, bakee and be dried to obtain dry mash, by dry mash water dissolution, be filtrated to get secondary filtrate and secondary filter
Cake；Then by sodium hydroxide solution B that secondary filter cake concentration is 68wt% in 82 DEG C of dissolvings, filter,
To three filtrates and three filter cakes；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water,
Filter, take filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, reduces filtrate pH to 5.5, take filtrate after filtration and obtain
To material c；
S5, by weight 14 parts of ethyl acetate are added drop-wise in 3 parts of material c, do not stop during dropping to stir
Mixing, being subsequently adding 8 parts of concentration is the sulfuric acid solution of 31wt%, and centrifugation takes filtrate, then uses distilled water
Wash filtrate, the time of washing is 45min, is placed in drying baker by the material after washing and is dried, the temperature being dried
Degree is 85 DEG C, and the time being dried is 4h, is cooled to room temperature and obtains silicon dioxide.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art is in the technical scope that the invention discloses, according to this
The technical scheme of invention and inventive concept thereof in addition equivalent or change, all should contain the protection in the present invention
Within the scope of.
Claims (10)
1. the method extracting silicon dioxide in a slag, it is characterised in that comprise the steps:
S1, slag is put in reactor, in reactor, is then passed through oxygen, carries out a roasting successively,
After baking and three roastings, be cooled to room temperature and obtain material a；
S2, material a is mixed homogeneously with sodium carbonate after put in stove and melt, obtain molten mass, then
By molten mass shrend, obtain fine grained material；
S3, the fine grained material wet grinding obtained by S2 become thick slurry, dilute, be filtrated to get first-time filtrate and
Secondary filter cake；Taking a filter cake sodium hydroxide solution A to dissolve, then heat concentration, baking is dried to obtain dry
Powder, by dry mash water dissolution, is filtrated to get secondary filtrate and secondary filter cake；Then secondary filter cake is used
Sodium hydroxide solution B dissolves, and filters, obtains three filtrates and three filter cakes；By first-time filtrate, secondary filter
Liquid and three filtrates merge, and dilute with water filters, takes filtrate and obtain material b；
S4, in material b, it is passed through carbon dioxide, takes filtrate after filtration and obtain material c；
S5, ethyl acetate is added drop-wise in material c, does not stop stirring during dropping, be subsequently adding sulphuric acid
Solution, centrifugation takes filtrate, then uses distilled water wash filtrate, and the material after washing is placed on drying baker
In be dried, be cooled to room temperature and obtain silicon dioxide.
The method extracting silicon dioxide in slag the most according to claim 1, it is characterised in that S1
In, the temperature of a roasting is 280-350 DEG C, and the time of a roasting is 1-3h；The temperature of after baking
For 500-550 DEG C, the time of after baking is 2-4h；The temperature of three roastings is 600-650 DEG C, three times
The time of roasting is 0.5-1.5h.
The method extracting silicon dioxide in slag the most according to claim 1 and 2, it is characterised in that
In S2, melting putting in stove after material a and sodium carbonate mix homogeneously, melt temperature is
1150-1350 DEG C, the melting time is 30-40min, obtains the molten mass of 1050-1150 DEG C, then will be melted
Body shrend, obtains fine grained material；
Preferably, in S2, the weight ratio of material a and sodium carbonate is 1:1.2-1.8；
Preferably, in S2, the particle diameter of fine grained material is 1-5mm.
4., according to the method extracting silicon dioxide in the slag described in any one of claim 1-3, its feature exists
In, in S3, the fine grained material wet grinding obtained by S2 becomes thick slurry, dilutes, is filtrated to get first-time filtrate
With a filter cake；Take a filter cake sodium hydroxide solution A in 70-80 DEG C of dissolving, then heat concentration,
Baking is dried to obtain dry mash, by dry mash water dissolution, is filtrated to get secondary filtrate and secondary filter cake；So
After by secondary filter cake with sodium hydroxide solution B in 65-85 DEG C of dissolving, filter, obtain three filtrates and three times
Filter cake；First-time filtrate, secondary filtrate and three filtrates are merged, dilute with water, filter, take filtrate and obtain
Material b.
The method extracting silicon dioxide in slag the most according to claim 4, it is characterised in that S3
In, the concentration of sodium hydroxide solution A is 45-55wt%；The concentration of sodium hydroxide solution B is 65-75wt%.
6., according to the method extracting silicon dioxide in a kind of slag described in any one of claim 1-5, it is special
Levy and be, in S4, in material b, be passed through carbon dioxide, reduce filtrate pH to 5.2-6.3, filter
After take filtrate and obtain material c.
7., according to the method extracting silicon dioxide in a kind of slag described in any one of claim 1-6, it is special
Levying and be, in S5, the mass ratio of ethyl acetate, material c and sulfuric acid solution is 5-15:2-8:3-9.
8., according to the method extracting silicon dioxide in a kind of slag described in any one of claim 1-7, it is special
Levying and be, in S5, the concentration of sulfuric acid solution is 28-32wt%.
9., according to the method extracting silicon dioxide in a kind of slag described in any one of claim 1-8, it is special
Levying and be, in S5, the time of washing is 20-50min.
10. according to the method extracting silicon dioxide in a kind of slag described in any one of claim 1-9, its
Being characterised by, in S5, the temperature being dried is 80-120 DEG C, and the time being dried is 1-5h.
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| CN201610381980.3A CN105936508A (en) | 2016-06-01 | 2016-06-01 | Method for extracting silica from ore slag |
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| CN201610381980.3A CN105936508A (en) | 2016-06-01 | 2016-06-01 | Method for extracting silica from ore slag |
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| CN101172633A (en) * | 2007-10-11 | 2008-05-07 | 刘成长 | Technique for producing hydroted alumina and silicic acid with high-silicon low-aluminium mineral raw material |
| CN102534190A (en) * | 2012-01-20 | 2012-07-04 | 彭武星 | Three-section type heating and roasting method for refining vanadium pentoxide |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101172633A (en) * | 2007-10-11 | 2008-05-07 | 刘成长 | Technique for producing hydroted alumina and silicic acid with high-silicon low-aluminium mineral raw material |
| CN102534190A (en) * | 2012-01-20 | 2012-07-04 | 彭武星 | Three-section type heating and roasting method for refining vanadium pentoxide |
Non-Patent Citations (1)
| Title |
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| 秦晓东等: "高比表面积超细二氧化硅粉体的制备", 《石油大学学报（自然科学版）》 * |
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Application publication date: 20160914 |