CN112011691A - Efficient resource utilization method for red mud - Google Patents

Efficient resource utilization method for red mud Download PDF

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CN112011691A
CN112011691A CN202010891627.6A CN202010891627A CN112011691A CN 112011691 A CN112011691 A CN 112011691A CN 202010891627 A CN202010891627 A CN 202010891627A CN 112011691 A CN112011691 A CN 112011691A
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titanium
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red mud
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sulfuric acid
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何耀
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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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1236—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching
    • C22B34/124—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors
    • C22B34/1245—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors containing a halogen ion as active agent
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/14—Obtaining zirconium or hafnium
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/20—Obtaining niobium, tantalum or vanadium
    • C22B34/22—Obtaining vanadium
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/20—Obtaining niobium, tantalum or vanadium
    • C22B34/24—Obtaining niobium or tantalum
    • 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
    • C22B59/00—Obtaining rare earth metals
    • 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

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  • Manufacturing & Machinery (AREA)
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  • Mechanical Engineering (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a red mud high-efficiency resource utilization method, wherein red mud is leached by dilute hydrochloric acid, the obtained ore pulp is separated by a thickener (or an ore washing tank), the overflow of the upper part (containing suspended matters, namely active soil) is used as a compound water purifying agent product, the sediment of the lower part is subjected to countercurrent washing by a multistage thickener (or an ore washing tank) by dilute hydrochloric acid with the pH value of 0.5-1, the washing liquid is used for diluting concentrated hydrochloric acid and then is used as leaching initial acid, the sediment of the last stage is subjected to magnetic separation to produce an iron concentrate product and titanium-rich slag, the titanium-rich slag is subjected to cyclic leaching by sulfuric acid to obtain titanium-rich liquid and sulfuric acid leaching slag, titanium, scandium and vanadium are recovered from the titanium-rich liquid, the residual liquid is used for producing polymeric ferric aluminum sulfate products, and the sulfuric acid leaching slag is used as raw materials for extracting zirconium, tantalum and. The method has the advantages of simple production process, low energy consumption, good production environment, no wastewater and waste residue discharge in the production process, realization of the complete drying and squeezing of the red mud resource, and remarkable economic benefit.

Description

Efficient resource utilization method for red mud
Technical Field
The invention belongs to the field of hydrometallurgy and solid waste resource utilization, and particularly relates to a red mud high-efficiency resource utilization method.
Background
The red mud is solid waste residue produced by leaching bauxite with high temperature, high pressure and strong base and performing solid-liquid separation, and the main components of the red mud are iron, aluminum, silicon, calcium, sodium, titanium, oxygen and a small amount of rare metals such as scandium, zirconium, vanadium, tantalum, niobium and the like. In red mudThe mineral composition contained is complex, wherein: the hematite (alpha-Fe) generated in the process of high-temperature high-pressure strong alkali dissolution treatment of bauxite2O3) Hydrated garnet [ Ca ]3AlFe(SiO4)(OH)8]Sodium silicate (Na)2O·Al2O3·1.68SiO2·1.73H2O), calcium aluminate (Ca (AlO)2)2) Perovskite (CaTiO)3) New minerals such as goethite (alpha-FeOOH) and diaspore (Al)2O3·H2O), gibbsite (Al)2O3·3H2O), calcium hydroxide (Ca (OH)2) Calcium carbonate (CaCO)3) And gangue, sodium hydroxide (NaOH) and sodium aluminate (NaAlO) entrained in the new mineral and the residual mineral2) Sodium silicate (Na)2SiO3) Sodium carbonate (Na)2CO3) And water soluble bases and salts.
The red mud has high silicon and calcium contents, and more than 65 percent of silicon and more than 95 percent of calcium are easily dissolved in dilute hydrochloric acid. The silicic acid is generated after the silicon-containing mineral is dissolved by dilute acid, and the silicic acid is mainly in a pulp in a sol state due to low solubility of the silicic acid in water and is easy to agglomerate into silica gel, so that the leaching solution is difficult to filter and separate and recover valuable metals; when calcium in the red mud reacts with sulfuric acid, the amount of the produced calcium sulfate dihydrate slag is 4.3 times of the calcium content of the red mud, and the slag amount is too large, so that serious adverse effect is generated on the recovery of valuable metals. In order to overcome the problems, the conventional developed red mud resource recycling process is often too complex, so that the product recycling cost is too high, even the recycling cost is far higher than the market price of the recycled product, the process is not feasible in technical economy, the problem of treatment and discharge of secondary waste residues and wastewater also exists in the aspect of environmental protection, the industrial technology for large-scale utilization of the red mud still has no breakthrough progress at home and abroad till now, and most of the red mud can only be stockpiled for a long time. The stockpiling of the red mud occupies precious land resources, and has the risk of dam break and the risk of releasing alkaline substances to pollute the environment. Until now, the comprehensive utilization of red mud is still an urgent problem for the development of the aluminum industry.
On the other hand, with the rapid development of the industry and agriculture of ChinaThe environmental awareness of people is improved, a large amount of sewage needs to be strictly purified, so that a large amount of high-efficiency water purifying agent products are needed to meet market demands, and the red mud contains substances with water purifying effect, accounts for more than 90%, and contains rare metal resources such as titanium, scandium, zirconium, vanadium, tantalum, niobium and the like. The acid ore pulp obtained after the reaction of the red mud and the dilute hydrochloric acid contains Al3+、Fe3+、Ca2+、Na+、H4SiO4(silica sol), active earth and undecomposed minerals containing iron, aluminum, titanium, scandium, zirconium, vanadium, tantalum, niobium and the like. Al (Al)3+、Fe3+、Ca2+、H4SiO4(silica sol) when used for sewage purification treatment, Al is contained in the solution because the pH value of the solution is neutral3+、Fe3+Hydrolysis to give hydroxide precipitate, H4SiO4(silica sol) dehydration to form precipitated silica, also with Ca in solution2+、Mg2+Or other heavy metal ions react to generate silicate precipitates which have strong functions of adsorbing and capturing heavy metal ions and suspended matters in the sewage, so that the water treatment device has the functions of removing heavy metals, COD, turbidity, decoloration, deodorization, and the like for purifying the sewage. The active soil is the residue of silicate mineral after the former high temperature high pressure alkali treatment and this strong acid treatment, has very big specific surface area and activity, exist with the suspended solid form in the acid ore pulp, when being used for sewage purification treatment, because of the pH value of solution is neutral, active soil and the aforesaid precipitate synergism of hydrolysising have superstrong absorption, the heavy metal ion in the net capture sewage, ammonium ion (ammonia nitrogen) and suspended solid effect, consequently have superstrong remove heavy metal, remove COD, remove ammonia nitrogen, remove turbid, decoloration, go smelly etc. purify the function of sewage. Therefore, it is urgent and necessary to develop a technology for extracting the water purifying substances from red mud to obtain water purifying agent products at low cost and extracting rare metal resources enriched in the residue.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method has the advantages that the components which are useful for sewage treatment in the red mud are extracted by a simple process and low production cost, the high-efficiency composite water purifying agent product is prepared, meanwhile, iron ore concentrate and rare metals such as titanium, scandium and vanadium are extracted from the remaining residues, the purpose of completely draining and squeezing the red mud resources is realized, and the purpose of changing the red mud into things of value is realized.
The invention is realized by the following modes: red mud is leached by dilute hydrochloric acid, the obtained ore pulp is separated by a thickener (or an ore washing tank), the overflow of the upper part (containing suspended matters, namely active soil) is used as a compound water purifying agent product, the sediment of the lower part is subjected to countercurrent washing by a multistage thickener (or an ore washing tank) by dilute hydrochloric acid with the pH value of 0.5-1, a washing liquid is used for diluting concentrated hydrochloric acid and is used as a leaching initial acid, the sediment of the last stage is subjected to magnetic separation to produce an iron concentrate product and titanium-rich slag, the titanium-rich slag is circularly leached by sulfuric acid to obtain a titanium-rich liquid and sulfuric acid leached slag, titanium, scandium and vanadium are recovered from the titanium-rich liquid, a residual liquid is used for producing a polymeric ferric aluminum sulfate product, and the sulfuric acid leached slag is used for extracting zirconium, tantalum and niobium or used as a. The method comprises the following specific steps:
1. leaching with dilute hydrochloric acid: leaching the red mud by using dilute hydrochloric acid, wherein the leaching condition is as follows: 1-2 mol/L of dilute hydrochloric acid, the liquid-solid ratio (ml/g) is 5-6, after reacting for 10-20 minutes, adding concentrated hydrochloric acid and red mud until the liquid-solid ratio is 4.0-4.5, the reaction temperature is 20-80 ℃, the reaction time is 0.5-1.5 hours, and the pH value of the end-point solution is less than or equal to 2. The obtained acid ore pulp contains Ca2+、Na+、H4SiO4(silica sol) and Al3+、Fe3+Active earth and undecomposed minerals containing iron, aluminum, titanium, scandium, zirconium, vanadium, tantalum, niobium and the like.
2. Separating slag and liquid of acid ore pulp: separating the acid ore pulp by using a thickener (or an ore washing tank), drying the upper overflow (containing active soil which exists in the form of suspended matters) serving as a composite water purifying agent product to obtain a solid water purifying agent product, carrying out countercurrent washing on the lower sedimentation slag 1 by using dilute hydrochloric acid with the pH value of 0.5-1 in a multistage thickener (or an ore washing tank) to obtain sedimentation slag 2 enriched with iron, titanium, scandium and vanadium and washing liquor 1, and using the washing liquor 1 to dilute concentrated hydrochloric acid to serve as leaching initial acid.
3. Magnetic separation iron selection: and (3) selecting iron from the sediment 2 by using a pulsating high-gradient magnetic separator, wherein the magnetic separation background field intensity is 0.8-1.0T, and the pulsating impact frequency is 210-240 times/min, so that an iron concentrate product and titanium-rich slag enriched with titanium, scandium and vanadium are obtained.
4. Sulfuric acid circulating leaching: the leaching conditions are as follows: 2-4 mol/L of sulfuric acid, the liquid-solid ratio (ml/g) of 4-6, the reaction temperature of 20-80 ℃, the reaction time of 1.0-3.0 h, and after solid-liquid separation, obtaining titanium liquid and sulfuric acid leaching residue, wherein when the titanium liquid contains TiO2And when the concentration is less than or equal to 30g/L, returning the titanium liquid to leaching, and continuously leaching the titanium-rich slag after adding concentrated sulfuric acid and washing liquid. When the titanium solution contains TiO2When the concentration is more than 30g/L, the titanium liquid is subjected to open-circuit recovery of titanium, scandium and vanadium. The sulfuric acid leaching residue is washed to form harmless residue which is used as a raw material for extracting zirconium, tantalum and niobium or used as a building material raw material, and the washing solution 2 is returned to leaching and recycling.
5. And (3) recovering titanium: TiO-containing obtained in the above step 42More than 30g/L of titanium liquid, and iron filings are used for reducing Fe in the titanium liquid3+And then heating and boiling for 2.0-3.0 h, and hydrolyzing the titanium liquid to obtain metatitanic acid serving as a raw material for preparing titanium dioxide.
6. And (3) scandium recovery: after metatitanic acid is extracted by titanium liquid hydrolysis, scandium is extracted from residual liquid by 15% P2O4+ 5% TBP + 80% sulfonated kerosene, and scandium-rich slag is obtained by back extraction by 10% sodium hydroxide solution and is used as a scandium extraction raw material.
7. And (3) recovering vanadium: and (3) neutralizing the scandium extraction raffinate with red mud until the pH value is 2.0-2.5, performing solid-liquid separation, returning filter residues to the step 1 to perform dilute hydrochloric acid leaching, extracting vanadium from the filtrate by using 15% P2O4 (subjected to saponification treatment), 10% BTP and 75% kerosene, using 10% sulfuric acid as a stripping agent, and using a sodium carbonate solution to precipitate vanadium to obtain vanadium-rich slag as a vanadium extraction raw material.
8. Raffinate utilization: the vanadium extraction raffinate mainly contains aluminum sulfate and ferrous sulfate, and the ferrous sulfate is oxidized into high iron by hydrogen peroxide to produce liquid or solid polymerized ferric aluminum sulfate products.
The red mud treatment method has the beneficial effects that:
1. leaching red mud with dilute hydrochloric acid to obtain hydrated garnet [ Ca ] in red mud3AlFe(SiO4)(OH)8]Sodium silicate (Na)2O·Al2O3·1.68SiO2·1.73H2O), calcium aluminate (Ca (AlO)2)2) Goethite (. alpha. -FeOOH), hydrocalcite (Ca (OH)2) Calcium carbonate (CaCO)3) Minerals such as sodium hydroxide (NaOH), sodium aluminate(NaAlO2) Sodium carbonate (Na)2CO3) Reacting and dissolving alkali and salt with dilute hydrochloric acid, adding concentrated hydrochloric acid and red mud after leaching reaction for 10-20 minutes until the total liquid-solid ratio is 4.0-4.5, so that Al in the acid ore pulp3+、Fe3+、Ca2+Ions and H4SiO4The concentration of the effective component of the water purifying agent such as silica sol is increased. Hematite (alpha-Fe) in red mud due to low hydrochloric acid concentration during the whole reaction process2O3) Perovskite (CaTiO)3) And minerals containing scandium, zirconium, vanadium, tantalum, niobium and the like are hardly leached, so that the minerals containing iron, titanium, scandium, zirconium, vanadium, tantalum, niobium and the like are enriched in the leaching slag. The acid ore pulp mainly contains Al3+、Fe3+、Ca2+And Na+Ion, H4SiO4(silica sol) and activated soil (which is present in the pulp in suspension). In the prior art, the residue and liquid are separated by adopting a filtering mode, the filtering speed is slow, and the effective component H for purifying the sewage is ensured4SiO4The loss of the (silica sol) and the active soil in the filter residue is caused, the amount of the residue is increased, the difficulty of recovering metals such as iron, titanium, scandium, zirconium, vanadium, tantalum, niobium and the like from the filter residue is increased, and the production benefit is greatly reduced. The invention adopts the thickener (or ore washing tank) to separate and counter-flow wash the bottom flow, which not only solves the problem of large amount of H4SiO4The difficult problem of slag-liquid separation of the ore pulp of (silica sol) and active soil and the recovery of Al in the ore pulp3+、Fe3+、Ca2+、H4SiO4The (silica sol) and the active soil are used as effective components of the composite water purifying agent, and the metals such as iron, titanium, scandium, zirconium, vanadium, tantalum, niobium and the like are enriched in leaching residues, so that the recycling cost is greatly reduced. The composite water purifying agent is very convenient to use and has excellent purifying effects of removing heavy metals, COD, ammonia nitrogen, turbidity, decoloration, odor and the like. When the treatment solution is used, only a proper amount of treatment solution needs to be added into sewage, the pH value of the sewage is adjusted to be neutral (the pH value is 6-9) by using lime after the treatment solution is uniformly stirred, the treatment solution is stirred for a moment and stands for several minutes, and the clear and transparent qualified treatment solution is obtained.
2. Most of iron in the red mud is recycled by iron ore concentrate products, and the rest of iron and most of silicon, aluminum and calcium are recycled by compound water purifying agents and polymeric ferric sulfate aluminum products.
3. Rare metals such as titanium, scandium, vanadium and the like in the red mud are enriched and recycled, the final tailing amount is only about 15 percent of the red mud amount, and the red mud can be used as raw materials for extracting zirconium, tantalum and niobium or building materials.
4. The process is simple, the energy consumption is low, the production environment is good, no wastewater and waste residue are discharged in the production process, the resource recycling rate is high, and remarkable economic benefits can be generated.
Drawings
FIG. 1 is a flow chart of a process for efficiently recycling red mud
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Examples
As shown in figure 1, the efficient resource utilization method of the red mud comprises the following steps:
1. diluting concentrated hydrochloric acid to 1.5mol/L by using washing liquor 1, wherein the liquid-solid ratio (ml/g) is 6, adding concentrated hydrochloric acid and red mud after reacting for 15 minutes until the total liquid-solid ratio is 4.5, the reaction temperature is 20-60 ℃, the reaction time is 1.0h, and the pH value of the final solution is 1.0.
2. And (2) separating the acid ore pulp obtained in the step (1) by using a thickener, drying the acid ore pulp to obtain a solid water purifying agent product by using overflow at the upper part as a composite water purifying agent product, and performing countercurrent washing on the sediment slag 1 at the lower part by using a five-stage thickener by using dilute hydrochloric acid with the pH value of 0.5-1 to obtain sediment slag 2 and washing liquor 1 which are enriched with iron, titanium, scandium and vanadium.
3. And (3) selecting iron from the sediment 2 by using a pulse high-gradient magnetic separator, wherein the magnetic separation background field intensity is 0.9T, and the pulse frequency is 220 times/min, so that an iron concentrate product and titanium-rich slag enriched with titanium, scandium and vanadium are obtained. The iron concentrate contains 56 percent of Fe, the total recovery rate of Fe is 61 percent, and the titanium-rich slag contains TiO215.7％，The titanium, scandium and vanadium content is enriched by more than 3 times.
4. Diluting concentrated sulfuric acid to 4mol/L by using washing liquor 2, leaching titanium-rich slag, wherein the liquid-solid ratio (ml/g) is 5, the reaction temperature is 20-70 ℃, the reaction time is 2.0h, and after solid-liquid separation, obtaining titanium liquid and sulfuric acid leaching slag, wherein the titanium liquid contains TiO225.2g/L, washing the sulfuric acid leaching slag to obtain harmless slag which is used as a raw material for extracting zirconium, tantalum and niobium or used as a building material raw material, and returning the washing liquid 2 to leaching and recycling. To TiO 22Adding concentrated sulfuric acid into 25.2g/L titanium solution until the sulfuric acid concentration of the solution is 3mol/L, continuously leaching the titanium-rich slag, and carrying out solid-liquid separation to obtain TiO-containing titanium solution243.6g/L。
5. TiO-containing obtained in the above step 4243.6g/L of titanium liquid, and reducing Fe in the titanium liquid by iron filings3+And then heating and boiling for 2.0-3.0 h, and hydrolyzing the titanium liquid to obtain metatitanic acid serving as a raw material for preparing titanium dioxide.
6. After metatitanic acid is extracted by titanium liquid hydrolysis, scandium is extracted from residual liquid by 15% P2O4+ 5% TBP + 80% sulfonated kerosene, and scandium-rich slag is obtained by back extraction by 10% sodium hydroxide solution and is used as a scandium extraction raw material.
7. And (3) neutralizing the scandium extraction raffinate with red mud until the pH value is 2.0-2.5, performing solid-liquid separation, returning filter residues to the step 1 to perform dilute hydrochloric acid leaching, extracting vanadium from the filtrate by using 15% P2O4 (subjected to saponification treatment), 10% BTP and 75% kerosene, using 10% sulfuric acid as a stripping agent, and using a sodium carbonate solution to precipitate vanadium to obtain vanadium-rich slag as a vanadium extraction raw material.
8. The vanadium extraction raffinate produced in the step 7 mainly contains aluminum sulfate and ferrous sulfate, and the ferrous sulfate is oxidized into high iron by hydrogen peroxide to produce liquid or solid polymerized ferric aluminum sulfate.

Claims (3)

1. A method for efficiently recycling red mud is characterized by comprising the following steps: red mud is leached by dilute hydrochloric acid, the obtained ore pulp is separated by a thickener (or an ore washing tank), the overflow of the upper part (containing suspended matters, namely active soil) is used as a compound water purifying agent product, the sediment of the lower part is subjected to countercurrent washing by a multistage thickener (or an ore washing tank) by dilute hydrochloric acid with the pH value of 0.5-1, a washing liquid is used for diluting concentrated hydrochloric acid and is used as a leaching initial acid, the sediment of the last stage is subjected to magnetic separation to produce an iron concentrate product and titanium-rich slag, the titanium-rich slag is circularly leached by sulfuric acid to obtain a titanium-rich liquid and sulfuric acid leached slag, titanium, scandium and vanadium are recovered from the titanium-rich liquid, a residual liquid is used for producing a polymeric ferric aluminum sulfate product, and the sulfuric acid leached slag is used for extracting zirconium, tantalum and niobium or used as a.
2. The red mud of claim 1 leached with dilute hydrochloric acid under the leaching conditions: 1-2 mol/L of dilute hydrochloric acid, the liquid-solid ratio (ml/g) is 5-6, after reacting for 10-20 minutes, adding concentrated hydrochloric acid and red mud until the liquid-solid ratio is 4.0-4.5, the reaction temperature is 20-80 ℃, the reaction time is 0.5-1.5 hours, and the pH value of the end-point solution is less than or equal to 2.
3. The titanium-rich slag of claim 1, which is leached with sulfuric acid under the following conditions: 2-4 mol/L of sulfuric acid, the liquid-solid ratio (ml/g) of 4-6, the reaction temperature of 20-80 ℃, the reaction time of 1.0-3.0 h, and after solid-liquid separation, obtaining titanium liquid and sulfuric acid leaching residue, wherein when the titanium liquid contains TiO2And when the concentration is less than or equal to 30g/L, returning the titanium liquid to leaching, and continuously leaching the titanium-rich slag after adding concentrated sulfuric acid and washing liquid. When the titanium solution contains TiO2When the concentration is more than 30g/L, the titanium liquid is subjected to open-circuit recovery of titanium, scandium and vanadium.
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CN113444875A (en) * 2021-06-28 2021-09-28 贵州理工学院 Resource utilization method for synergistic treatment of antimony sulfide concentrate and aluminum industrial waste residues
CN113857209A (en) * 2021-09-24 2021-12-31 南华大学 Red mud recycling method and application thereof
CN114480860A (en) * 2022-01-11 2022-05-13 中国科学院地球化学研究所 Method for selectively leaching rare earth elements from red mud
CN115725860A (en) * 2022-09-15 2023-03-03 新疆盛安新材料科技有限公司 High-silicon vanadium-containing residue acid leaching vanadium extraction method

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CN113444875B (en) * 2021-06-28 2022-11-29 贵州理工学院 Resource utilization method for synergistic treatment of antimony sulfide concentrate and aluminum industrial waste residues
CN113857209A (en) * 2021-09-24 2021-12-31 南华大学 Red mud recycling method and application thereof
CN113857209B (en) * 2021-09-24 2023-01-24 南华大学 Red mud recycling method and application thereof
CN114480860A (en) * 2022-01-11 2022-05-13 中国科学院地球化学研究所 Method for selectively leaching rare earth elements from red mud
CN114480860B (en) * 2022-01-11 2022-12-23 中国科学院地球化学研究所 Method for selectively leaching rare earth elements from red mud
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