CN111570095B - Process for recovering titanium dioxide acidolysis residues - Google Patents
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- CN111570095B CN111570095B CN202010362663.3A CN202010362663A CN111570095B CN 111570095 B CN111570095 B CN 111570095B CN 202010362663 A CN202010362663 A CN 202010362663A CN 111570095 B CN111570095 B CN 111570095B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
- B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/002—Inorganic compounds
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/007—Modifying reagents for adjusting pH or conductivity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
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Abstract
The invention relates to the technical field of titanium dioxide production by a sulfuric acid method, and particularly discloses a process for recovering titanium dioxide acidolysis residues, which comprises the following steps: washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, adding hydrochloric acid into the filter residue for reaction, filtering to obtain filter cake, washing, and drying; crushing and grinding the filter cake into powder with the particle size of 35-120 mu m; mixing the powder to prepare a suspension with a solid content of 20-30 wt.%, adjusting the pH to 5.0-7.0, adding sodium silicate and nitrilotriacetic acid, stirring and mixing uniformly, and then adding a flotation collector to perform flotation to obtain the titanium ore. The process for recycling the titanium dioxide acidolysis residues fully recycles the residues in the titanium dioxide acidolysis process, not only can save mineral resources, but also can reduce the discharge of waste residues, and has good economic benefit and environmental benefit. Most of titanium elements in the residue are effectively recovered, the recovery rate of the titanium ore reaches over 88 percent, and the grade of the recovered titanium ore is improved.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production by a sulfuric acid method, and particularly relates to a process for recovering titanium dioxide acidolysis residues.
Background
Titanium dioxide is an important white pigment and is widely applied to the fields of plastics, papermaking, printing ink, chemical fibers, rubber, cosmetics and the like, and the production method mainly comprises a sulfuric acid method and a chlorination method. Due to the raw material sources, the technology and other reasons, most of the titanium dioxide production plants in China adopt a sulfuric acid method to produce titanium dioxide. The sulfuric acid method is to carry out acidolysis reaction on titanium ore and concentrated sulfuric acid to generate titanyl sulfate, then hydrolyze the titanyl sulfate to generate metatitanic acid, and calcine, intermediate crushing and post-treatment are carried out after the metatitanic acid is subjected to impurity removal to obtain the titanium dioxide product. In the production process of titanium dioxide, a solution after titanium ore acidolysis reaction contains a plurality of solid residues, the solid residues are treated as waste residues after sedimentation and filtration to obtain acidolysis residues, according to statistics, about 0.3-0.4 ton of acidolysis residues are generated in 1 ton of titanium dioxide, and according to analysis, the content of titanium dioxide in the residues is about 20%, so that the titanium dioxide has recycling value. Titanium dioxide in the acidolysis residue exists mainly as unreacted ilmenite, and a small amount of argillaceous minerals, pyroxene, magnesia-alumina spinel, olivine, quartz, pyrrhotite, pyrite and the like also exist in the acidolysis residue, and the titanium content is relatively low, so that the titanium dioxide cannot be directly returned to an acidolysis working section for utilization due to complex components. The problems of comprehensive utilization and resource treatment of the acidolysis residue are not well solved at present, and the acidolysis residue is basically discarded as waste, so that valuable resources in the acidolysis residue are wasted, the profit of the product is reduced, and the discharged waste residue is stored to cause harm to the environment.
The acidolysis residue is recycled, useful components in the residue need to be extracted to the maximum extent, so that pollution is reduced to the minimum, and the main treatment methods proposed at present comprise an acid leaching method, an extraction method, a gravity separation method, a magnetic separation method, a flotation method and the like, wherein the flotation method is an important treatment method, most of titanium dioxide in the acidolysis residue can be recovered, and a flotation product is used as a titanium dioxide production raw material. The existence of other materials in the acidolysis residue can influence the flotation effect, the poor selectivity of the collecting agent can also influence the flotation effect, and the recycling rate and the recycling quality of the acidolysis waste residue are not ideal.
Disclosure of Invention
The invention aims to provide a process for recovering titanium dioxide acidolysis residues, which is used for treating the acidolysis residues, recovering titanium ore in the residues and simultaneously improving the recovery rate and the recovery quality of the acidolysis residues.
In order to achieve the aim, the technical scheme of the invention is a process for recovering titanium dioxide acidolysis residues, which comprises the following steps:
(1) washing titanium dioxide acidolysis residues with water, filtering to obtain filter residues, adding hydrochloric acid into the filter residues, reacting at 50-60 ℃ for 2-3 h, filtering to obtain filter cakes, washing and drying the filter cakes;
(2) crushing and grinding the filter cake dried in the step (1) into powder, and controlling the particle size of the powder to be 35-120 mu m;
(3) adding water and a dispersing agent into the powder obtained in the step (2), mixing to prepare a suspension with a solid content of 20-30 wt.%, adding a pH regulator to adjust the pH to 5.0-7.0, adding sodium silicate and nitrilotriacetic acid, stirring and mixing uniformly, and then adding a flotation collecting agent to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 25-35 parts of alpha-sulfonated sodium stearate, 15-22 parts of polyether dodecyl amine acetate, 2-5 parts of salicylhydroxamic acid and 3-8 parts of pine oil;
(4) and (4) washing, filtering, drying and grinding the titanium ore obtained in the step (3) into mineral powder to obtain the raw material for producing titanium dioxide.
The technical scheme of the invention is mainly based on the following principle: firstly, the acidolysis residue is washed by water to remove the residual soluble substances such as sulfuric acid, ferrous sulfate and the like in the acidolysis residue. Most of mineral substances containing iron, aluminum, calcium, magnesium and the like in the residue are leached by hydrochloric acid, and the residual filter residue contains almost all titanium ores and a small amount of hydrochloric acid insoluble substances such as silica, pyroxene, aluminite and the like, so that the influence of various substances on the subsequent flotation effect is removed. Adding sodium silicate and nitrilotriacetic acid to inhibit other minerals such as silicon, calcium and aluminum, wherein the sodium silicate adsorbs on the surface of the silicate mineral through negatively charged silicate colloidal particles and silicate hydroxide radicals to make the mineral strongly hydrophilic and inhibit the silicate mineral; the nitrilotriacetic acid contains three carboxyl groups with strong hydrophilicity, the carboxyl groups are ionized into anions in water, the ionized carboxyl groups are complexed with minerals such as calcium, aluminum and the like, and the other carboxyl groups are hydrophilic groups, so that the whole complex is hydrophilic, and the calcium and aluminum minerals are inhibited. And finally, adding a flotation collector to float and separate out the titanium ore, wherein the flotation collector is combined with anionic collector sulfonated sodium stearate, cationic collector polyether dodecyl amine acetate and salicylhydroxamic acid to be adsorbed on the surface of the ilmenite through physical adsorption and chemical adsorption in an interpenetration manner, so that the titanium ore is good in selectivity and strong in collecting capacity, and the recovery rate of the titanium ore and the grade of the recovered titanium ore are improved.
Preferably, in the process for recovering titanium dioxide acidolysis residue, in the step (1), the mass percentage concentration of hydrochloric acid is 3-8%, and the volume ratio of the mass of the filter residue to the hydrochloric acid is 1g: 3-5 ml.
Preferably, in the process for recovering titanium dioxide acidolysis residues, the dispersing agent is sodium lignosulfonate or sodium dodecyl benzene sulfonate, and the addition amount of the dispersing agent is 0.2-0.5% of the mass of the powder.
Preferably, in the process for recovering titanium dioxide acidolysis residue, the total adding amount of the sodium silicate and the nitrilotriacetic acid is 0.01-0.05% of the mass of the powder, and the mass ratio of the sodium silicate to the nitrilotriacetic acid is 2-3: 1.
Preferably, in the process for recovering titanium dioxide acidolysis residue, the addition amount of the flotation collector is 0.12-0.25% of the mass of the powder.
Preferably, in the process for recovering the acidolysis residue of titanium dioxide, the pH regulator is sulfuric acid, oxalic acid or citric acid.
Preferably, in the process for recovering titanium dioxide acidolysis residues, the technological parameters of stirring and uniformly mixing are as follows: the stirring speed is 1200-1800 r/min, and the time is 3-5 min.
Compared with the prior art, the invention has the following beneficial effects:
1. the process for recycling the titanium dioxide acidolysis residues fully recycles the residues in the titanium dioxide acidolysis process, not only can save mineral resources, but also can reduce the discharge of waste residues and reduce environmental pollution, and has good economic benefit and environmental benefit.
2. The process for recovering titanium dioxide acidolysis residue firstly adopts hydrochloric acid to remove most of mineral impurities such as iron, aluminum, magnesium and the like in the acidolysis residue, and then adopts a flotation process to remove the remaining impurities to select qualified titanium ore. In the flotation process, sodium silicate and nitrilotriacetic acid are added to inhibit other minerals such as silicon, calcium, aluminum and the like, titanium ore is selected and collected by a flotation collector combining anionic collector sulfonated sodium stearate, cationic collector polyether dodecyl amine acetate and salicylhydroxamic acid, and the flotation collector is interpenetrated on the surface of the ilmenite through physical adsorption and chemical adsorption, so that the collecting effect is good. The method has the advantages that most of titanium elements in the residues are effectively recycled, the recycling effect is improved, the recovery rate of titanium ores in the residues reaches over 88%, and the grade of the recycled titanium ores is improved.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
A process for recovering titanium dioxide acidolysis residues comprises the following steps:
(1) washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, adding 5% hydrochloric acid by mass into the filter residue, adding 4ml hydrochloric acid into each gram of filter residue, reacting at 55 ℃ for 2h, filtering to obtain filter cake, washing the filter cake with distilled water for 4 times, and drying;
(2) crushing and grinding the filter cake dried in the step (1) into powder with the particle size of 35-75 mu m;
(3) adding the powder obtained in the step (2), water and sodium lignosulfonate into a flotation device, mixing to prepare suspension with a solid content of 25 wt.%, wherein the addition amount of the sodium lignosulfonate is 0.3% of the mass of the powder, adding sulfuric acid to adjust the pH value to be 5.0-6.0, adding sodium silicate and nitrilotriacetic acid in a mass ratio of 2:1, stirring uniformly, wherein the stirring speed is 1600r/min, the stirring time is 3min, and the addition amount of the sodium silicate and the nitrilotriacetic acid is 0.03% of the mass of the powder; then adding a flotation collector for flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 30 parts of sulfonated sodium stearate, 20 parts of polyether dodecyl amine acetate, 3 parts of salicylhydroxamic acid and 6 parts of pinitol oil, wherein the addition amount of the flotation collector is 0.18% of the powder;
(4) and (4) washing, filtering and drying the titanium ore obtained in the step (3), and grinding the titanium ore into mineral powder to obtain the raw material for producing titanium dioxide.
Example 2
A process for recovering titanium dioxide acidolysis residues comprises the following steps:
(1) washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, adding 3% hydrochloric acid by mass into the filter residue, adding 5ml hydrochloric acid into each gram of filter residue, reacting at 60 ℃ for 2h, filtering to obtain filter cake, washing the filter cake with distilled water for 4 times, and drying;
(2) crushing and grinding the filter cake dried in the step (1) into powder with the particle size of 75-120 mu m;
(3) adding the powder obtained in the step (2), water and sodium lignosulfonate into a flotation device, mixing to prepare a suspension with a solid content of 30wt.%, wherein the addition amount of the sodium lignosulfonate is 0.2% of the mass of the powder, adding sulfuric acid to adjust the pH value to be 6.0-7.0, then adding sodium silicate and nitrilotriacetic acid with a mass ratio of 2.5:1, stirring uniformly, wherein the stirring speed is 1600r/min, the time is 3min, the addition amount of the sodium silicate and the nitrilotriacetic acid is 0.02% of the mass of the powder, and adding a flotation collector to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 25 parts of sulfonated sodium stearate, 18 parts of polyether dodecyl amine acetate, 4 parts of salicylhydroxamic acid and 5 parts of pinitol oil, wherein the addition amount of the flotation collector is 0.22% of the powder;
(4) and (4) washing, filtering and drying the titanium ore obtained in the step (3), and grinding the titanium ore into mineral powder to obtain the raw material for producing titanium dioxide.
Example 3
A process for recovering titanium dioxide acidolysis residues comprises the following steps:
(1) washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, adding 3% hydrochloric acid by mass into the filter residue, adding 5ml hydrochloric acid into each gram of filter residue, reacting at 60 ℃ for 2h, filtering to obtain filter cake, washing the filter cake with distilled water for 4 times, and drying;
(2) crushing and grinding the filter cake dried in the step (1) into powder with the particle size of 75-120 mu m;
(3) adding the powder obtained in the step (2), water and sodium dodecyl benzene sulfonate into a flotation device, mixing to prepare a suspension with a solid content of 30wt.%, wherein the adding amount of the sodium dodecyl benzene sulfonate is 0.5% of the mass of the powder, adding oxalic acid to adjust the pH value to be 6.0-7.0, then adding sodium silicate and nitrilotriacetic acid with a mass ratio of 3:1, stirring uniformly, wherein the stirring speed is 1200r/min, the time is 5min, the adding amount of the sodium silicate and the nitrilotriacetic acid is 0.05% of the mass of the powder, and adding a flotation collector to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 32 parts of sulfonated sodium stearate, 15 parts of polyether dodecyl amine acetate, 5 parts of salicylhydroxamic acid and 3 parts of pinitol oil, wherein the addition amount of the flotation collector is 0.12% of powder;
(4) and (4) washing, filtering and drying the titanium ore obtained in the step (3), and grinding the titanium ore into mineral powder to obtain the raw material for producing titanium dioxide.
Example 4
A process for recovering titanium dioxide acidolysis residues comprises the following steps:
(1) washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, adding hydrochloric acid with the mass percentage concentration of 8% into the filter residue, adding 3ml of hydrochloric acid into each gram of filter residue, reacting at 60 ℃ for 2h, filtering to obtain filter cake, washing the filter cake with distilled water for 4 times, and drying;
(2) crushing and grinding the filter cake dried in the step (1) into powder with the particle size of 45-90 microns;
(3) adding the powder obtained in the step (2), water and sodium dodecyl benzene sulfonate into a flotation device, mixing to prepare a suspension with a solid content of 20 wt.%, wherein the adding amount of the sodium dodecyl benzene sulfonate is 0.2% of the mass of the powder, adding oxalic acid to adjust the pH value to be 5.5-6.5, then adding sodium silicate and nitrilotriacetic acid with a mass ratio of 2:1, stirring uniformly, wherein the stirring speed is 1450r/min, the stirring time is 5min, the adding amount of the sodium silicate and the nitrilotriacetic acid is 0.02% of the mass of the powder, and adding a flotation collector to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 35 parts of sulfonated sodium stearate, 18 parts of polyether dodecyl amine acetate, 2 parts of salicylhydroxamic acid and 3 parts of pinitol oil, wherein the addition amount of the flotation collecting agent is 0.12% of powder;
(4) and (4) washing, filtering and drying the titanium ore obtained in the step (3), and grinding the titanium ore into mineral powder to obtain the raw material for producing titanium dioxide.
Comparative example 1
The comparative example provides a process for recovering titanium dioxide acidolysis residue, which comprises the following steps:
(1) washing titanium dioxide acidolysis residue with water, filtering to obtain filter residue, and drying the filter residue;
(2) crushing the filter residue dried in the step (1) and grinding the filter residue into powder with the particle size of 35-75 mu m;
(3) same as in step (3) of example 1;
(4) same as in step (4) of example 1.
Comparative example 2
The comparative example provides a process for recovering titanium dioxide acidolysis residue, which is different from the process in example 1 in that: the flotation collector comprises the following components in parts by weight: 50 parts of sulfonated sodium stearate, 3 parts of salicylhydroxamic acid and 6 parts of pinitol oil, and other steps and parameters are the same as those in example 1.
Comparative example 3
The comparative example provides a process for recovering titanium dioxide acidolysis residue, which is different from the process in example 1 in that: the flotation collector comprises the following components in parts by weight: polyether dodecylamine acetate 50 parts, salicylic hydroxamic acid 3 parts, and terpineol oil 6 parts, and other steps and parameters were the same as in example 1.
Comparative example 4
The comparative example provides a process for recovering titanium dioxide acidolysis residue, which is different from the process in example 1 in that: the flotation collector comprises the following components in parts by weight: 30 parts of sulfonated sodium stearate, 20 parts of polyether dodecyl amine acetate and 6 parts of pine oil, and other steps and parameters are the same as those in example 1.
Comparative example 5
The comparative example provides a process for recovering titanium dioxide acidolysis residue, which is different from the process in example 1 in that: (3) adding the powder obtained in the step (2), water and sodium lignin sulfonate into a flotation device, mixing to prepare suspension with a solid content of 25 wt.%, wherein the addition amount of the sodium lignin sulfonate is 0.3% of the mass of the powder, adding sulfuric acid to adjust the pH value to be 5.0-6.0, then adding sodium silicate, stirring uniformly, wherein the stirring speed is 1600r/min, the time is 3min, the addition amount of the sodium silicate is 0.02% of the mass of the powder, and adding a flotation collector to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 25 parts of sulfonated sodium stearate, 18 parts of polyether dodecyl amine acetate, 4 parts of salicylhydroxamic acid and 5 parts of pinitol oil, wherein the addition amount of the flotation collector is 0.22% of powder. The other steps and parameters were the same as in example 1.
The titanium dioxide acidolysis residue was treated by the procedures of examples and comparative examples, and the grade of the untreated acidolysis residue was 15.57% (titanium dioxide content), and the results after treatment are shown in table 1, wherein the recovery rate was calculated by dividing the amount of the recovered titaniferous ore by the amount of the titaniferous ore in the residue and multiplying by one hundred percent. It can be seen from table 1 that the titanium ore grade recovered by the process for recovering titanium dioxide acidolysis residue of the present invention is up to more than 48%, and the recovery rate is up to more than 88%.
TABLE 1 titanium ore grade and recovery after treatment of titanium dioxide acidolysis residue
| Group of | Grade of titanium ore (%) | Recovery (%) |
| Example 1 | 48.64 | 88.72 |
| Example 2 | 48.52 | 88.19 |
| Example 3 | 48.61 | 88.46 |
| Example 4 | 48.57 | 88.50 |
| Comparative example 1 | 35.56 | 73.72 |
| Comparative example 2 | 36.12 | 74.35 |
| Comparative example 3 | 35.57 | 74.40 |
| Comparative example 4 | 34.62 | 75.10 |
| Comparative example 5 | 35.56 | 72.87 |
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. A process for recovering titanium dioxide acidolysis residues is characterized by comprising the following steps:
(1) washing titanium dioxide acidolysis residues with water, filtering to obtain filter residues, adding hydrochloric acid into the filter residues, reacting at 50-60 ℃ for 2-3 h, filtering to obtain filter cakes, washing and drying the filter cakes;
(2) crushing and grinding the filter cake dried in the step (1) into powder, and controlling the particle size of the powder to be 35-120 mu m;
(3) adding water and a dispersing agent into the powder obtained in the step (2), mixing to prepare a suspension with a solid content of 20-30 wt.%, adding a pH regulator to adjust the pH to 5.0-7.0, adding sodium silicate and nitrilotriacetic acid, stirring and mixing uniformly, and then adding a flotation collecting agent to perform flotation to obtain titanium ore; the flotation collector comprises the following components in parts by weight: 25-35 parts of alpha-sulfonated sodium stearate, 15-22 parts of polyether dodecyl amine acetate, 2-5 parts of salicylhydroxamic acid and 3-8 parts of pine oil; the total adding amount of the sodium silicate and the nitrilotriacetic acid is 0.01-0.05% of the mass of the powder, and the mass ratio of the sodium silicate to the nitrilotriacetic acid is 2-3: 1;
(4) and (4) washing, filtering, drying and grinding the titanium ore obtained in the step (3) into mineral powder to obtain the raw material for producing titanium dioxide.
2. The process for recovering titanium dioxide acidolysis residue according to claim 1, wherein in the step (1), the mass percentage concentration of the hydrochloric acid is 3-8%, and the volume ratio of the mass of the filter residue to the hydrochloric acid is 1g: 3-5 ml.
3. The process for recovering titanium dioxide acidolysis residue as claimed in claim 1, wherein the dispersant is sodium lignin sulfonate or sodium dodecyl benzene sulfonate, and the addition amount of the dispersant is 0.2-0.5% of the mass of the powder.
4. The process for recovering titanium dioxide acidolysis residue according to claim 1, wherein the flotation collector is added in an amount of 0.12-0.25% by mass of the powder.
5. The process for recovering titanium dioxide acidolysis residue as claimed in claim 1, wherein the pH regulator is sulfuric acid, oxalic acid or citric acid.
6. The process for recovering titanium dioxide acidolysis residue according to claim 1, wherein in the step (3), the stirring and uniformly mixing process parameters are as follows: the stirring speed is 1200-1800 r/min, and the time is 3-5 min.
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| 钛铁矿浮选药剂作用机理及进展;董文超等;《矿产保护与利用》;20190831(第4期);第159-164页 * |
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