CN103435079B - Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature - Google Patents
Technology for producing aluminium oxide by decomposing mineral containing aluminosilicate at low temperature Download PDFInfo
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- CN103435079B CN103435079B CN201310396927.7A CN201310396927A CN103435079B CN 103435079 B CN103435079 B CN 103435079B CN 201310396927 A CN201310396927 A CN 201310396927A CN 103435079 B CN103435079 B CN 103435079B
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Abstract
The invention relates to a technology for producing aluminium oxide by decomposing a mineral containing aluminosilicate at a low temperature. The technology for producing the aluminium oxide by decomposing the mineral containing aluminosilicate at a low temperature comprises the following steps of: (1) grinding the mineral containing aluminosilicate, uniformly mixing the mineral containing aluminosilicate with 20-60wt% strong alkali solution at a mass ratio of 1.0: (0.5-2.5), then carrying out a hydrothermal reaction for 1-8 hours in a high-pressure container at the temperature of 200-300 DEG C and the pressure of 2-6MPa, and carrying out solid-liquid separation, thus obtaining potassium mother liquor and aluminium extracting clinker; (2) leaching the aluminium extracting clinker for 20-40 minutes by adopting 5-50wt% acid liquor, wherein the consumption of the acid liquor is 1-10 times weight of the aluminium extracting clinker, filtering, then regulating pH value of a solution containing aluminium to be 8-10, and carrying out solid-liquid separation to obtain filtrate and filter residue; (3) calcining. The technology for producing the aluminium oxide by decomposing the mineral containing aluminosilicate at the low temperature has the advantages of simple technological process, low decomposition temperature, short calcination time, low energy consumption, low production cost, good economic benefit and low pollution to the environment.
Description
Technical field
The present invention relates to a kind of technique of producing aluminum oxide, especially relate to the technique that a kind of aluminosilicate minerals low-temperature decomposition produces aluminum oxide.
Background technology
Aluminum oxide is a kind of important industrial raw material, mainly for the production of metallic aluminium, also can be applicable in chemical industry, electronics, pottery and pharmaceutical industries.Traditional processing technology all with bauxite or diaspore type ore for raw material extracts alumina product.China is alumina producing big country, and the country that to be a bauxite resource relatively poor of China, need a large amount of import bauxite resource, external dependence degree is up to 50%.Day by day in short supply along with the continual development of world economy and bauxite resource, seek the production carrying out aluminum oxide containing aluminium non-bauxitic substitution of resources part bauxite, be conducive to alleviating the contradiction that domestic high-quality bauxite resource lacks relatively, for effectively reducing external resource interdependency, improve the resource degree of self-sufficiency, ensure that national aluminium Industrial Security and Sustainable development tool are of great significance.
Aluminosilicate minerals is as the maximum existence form of aluminium in the earth's crust, and form 75% of earth's crust gross weight, resource reserve is very abundant, is a kind of bauxite alternate resources that can be used for extracting alumina product.But due to its Stability Analysis of Structures, silicon content is high, sial separating difficulty is comparatively large, fails to be fully used and universal suitability for industrialized production always.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of aluminosilicate minerals low-temperature decomposition to produce the technique of aluminum oxide.
The present invention solve that its technical problem adopts technical scheme be: a kind of aluminosilicate minerals low-temperature decomposition produces the technique of aluminum oxide, comprises the following steps:
(1) by after levigate for aluminosilicate minerals (fineness is-100 orders preferably), 35wt%-50wt% preferred with 20wt%-60wt%() strong base solution in mass ratio for the preferred 1.0:1.0-2.0 of 1.0:0.5-2.5() ratio mix, then in high pressure vessel, hydro-thermal reaction is carried out, temperature of reaction is 200 DEG C-300 DEG C, pressure is 2MPa-6MPa, reaction times is the preferred 2h-4h of 1h-8h(), solid-liquid separation, must carry potassium mother liquor and carry aluminium grog;
(2) step (1) gained is carried the preferred 10wt%-25wt% of aluminium grog 5wt%-50wt%() acid solution leaching 20min-40min, the consumption of acid solution is 1-10 times (preferred 2-5 doubly) carrying aluminium clinker weight, reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to 8-10, obtain Al (OH)
3throw out, solid-liquid separation obtains filtrate and filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 950 DEG C-1200 DEG C calcining 1.5h-2.5h.
Further, in step (1), described aluminosilicate minerals is the silicate minerals containing part aluminum-oxygen tetrahedron in the crystal layer structures such as feldspar, mica, kaolin, montmorillonite, illite, zeolite or garnet.
Further, in step (1), described strong base solution is sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution or solution of potassium carbonate.
Further, step (1) gained carries potassium mother liquor and step (2) gained filtrate as the raw material extracting potash fertilizer.
Further, in step (2), acid solution used is sulfuric acid, hydrochloric acid or nitric acid.
Further, in step (2), residue of aluminum-extracted can be used for preparing cement, pottery etc.
Compared with prior art, the present invention has the following advantages:
(1) can extract from bauxite alternate resources-aluminosilicate minerals and obtain aluminium metallurgy raw material-alchlor, aluminum oxide total recovery can up to more than 90%;
(2) technical process is simple, and decomposition temperature is low, and roasting time is short, and energy consumption is low, and production cost is low, good in economic efficiency;
(3) used to carry aluminum feedstock resource reserve very abundant, and selected reagent source is extensive, cheap;
(4) aluminosilicate minerals decomposes the raw material that the mother liquor obtained can be used as extraction potash fertilizer, and residue of aluminum-extracted can be used for preparing cement, pottery etc., and resource is effectively fully utilized, and meanwhile, without " three wastes " discharge, environmental pollution is little.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
embodiment 1
The present embodiment comprises the following steps:
(1) feldspar is levigate, cross 100 mesh sieves, the ratio being 1.0:1.0 according to Feldspar Powder and 40wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 220 DEG C, and pressure is 3MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, carries potassium mother liquor as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 80%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 2
The present embodiment comprises the following steps:
(1) feldspar is levigate, cross 100 mesh sieves, the ratio being 1.0:1.5 according to Feldspar Powder and 40wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal, temperature of reaction is 240 DEG C, and pressure is 4MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue,, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 84%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 3
The present embodiment comprises the following steps:
(1) feldspar is levigate, cross 100 mesh sieves, the ratio being 1.0:2.0 according to Feldspar Powder and 45wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 240 DEG C, and pressure is 4MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in 1000 DEG C of calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 92%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 4
The present embodiment comprises the following steps:
(1) feldspar is levigate, cross 100 mesh sieves, the ratio being 1.0:2.0 according to Feldspar Powder and 45wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 280 DEG C, and pressure is 6MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 94%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 5
The present embodiment comprises the following steps:
(1) mica is levigate, cross 100 mesh sieves, the ratio being 1.0:2.0 according to mica powder and 45wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 240 DEG C, and pressure is 4MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 94%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 6
The present embodiment comprises the following steps:
(1) montmorillonite is levigate, cross 100 mesh sieves, the ratio being 1.0:2.0 according to montmorillonite powder and 45wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 240 DEG C, and pressure is 4MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 92%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 7
The present embodiment comprises the following steps:
(1) garnet is levigate, cross 100 mesh sieves, the ratio being 1.0:2.0 according to pomegranate stone flour and 45wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 240 DEG C, and pressure is 4MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 25wt% sulfuric acid to leach 30min, sulfuric acid quality used is 2 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 94%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
embodiment 8
The present embodiment comprises the following steps:
(1) feldspar is levigate, cross 100 mesh sieves, the ratio being 1.0:1.0 according to pomegranate stone flour and 40wt% sodium hydroxide solution mass ratio mixes, then in high pressure vessel, carry out hydro-thermal reaction, temperature of reaction is 220 DEG C, and pressure is 3MPa, reaction times is 2h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog, and mother liquor is as the raw material extracting potash fertilizer;
(2) step (1) gained is carried aluminium grog 18wt% hydrochloric acid leaching 30min, hydrochloric acid quality used is 3 times of the quality carrying aluminium grog, the reactive aluminum in grog is dissolved and enters liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to be 9, obtain Al (OH)
3throw out, solid-liquid separation obtains filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 1000 DEG C calcining 2h, obtained high purity aluminium oxide.
The aluminum oxide total recovery of the present embodiment is 70%, and silica content, lower than 0.04%, reaches metallurgical-grade aluminum oxide purity requirement.
Claims (6)
1. aluminosilicate minerals low-temperature decomposition produces a technique for aluminum oxide, it is characterized in that, comprises the following steps:
(1) after aluminosilicate minerals is levigate, the ratio being 1.0:0.5-2.5 in mass ratio with the strong base solution of 20wt%-60wt% mixes, then in high pressure vessel, hydro-thermal reaction is carried out, temperature of reaction is 200 DEG C-300 DEG C, pressure is 2MPa-6MPa, reaction times is 1h-8h, solid-liquid separation, must carry potassium mother liquor and carry aluminium grog;
(2) step (1) gained is carried the acid solution leaching 20min-40min of aluminium grog 5wt%-50wt%, the consumption of acid solution is 1-10 times that carries aluminium clinker weight, the reactive aluminum in grog is made to enter liquid phase, filtering separation removing undissolved residue, then regulate the pH value containing aluminum solutions to 8-10, obtain Al (OH)
3throw out, solid-liquid separation obtains filtrate and filter residue, and filter residue main component is Al (OH)
3;
(3) be Al (OH) by step (2) gained main component
3filter residue in temperature 950 DEG C-1200 DEG C calcining 1.5h-2.5h.
2. aluminosilicate minerals low-temperature decomposition according to claim 1 produces the technique of aluminum oxide, and it is characterized in that: in step (1), described aluminosilicate minerals is feldspar, mica, kaolin, montmorillonite, illite, zeolite or garnet.
3. aluminosilicate minerals low-temperature decomposition according to claim 1 and 2 produces the technique of aluminum oxide, and it is characterized in that: in step (1), described strong base solution is sodium hydroxide solution or potassium hydroxide solution.
4. aluminosilicate minerals low-temperature decomposition according to claim 1 and 2 produces the technique of aluminum oxide, it is characterized in that: step (1) gained carries potassium mother liquor and step (2) gained filtrate as the raw material extracting potash fertilizer.
5. aluminosilicate minerals low-temperature decomposition according to claim 1 and 2 produces the technique of aluminum oxide, and it is characterized in that: in step (2), acid solution used is sulfuric acid, hydrochloric acid or nitric acid.
6. aluminosilicate minerals low-temperature decomposition according to claim 1 and 2 produces the technique of aluminum oxide, it is characterized in that: in step (2), undissolved residue is for the preparation of cement or pottery.
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| CN103818914B (en) * | 2014-02-26 | 2015-05-27 | 化工部长沙设计研究院 | Method for preparing sodium alumino silicate through decomposing feldspar |
| CN112573531B (en) * | 2019-09-27 | 2023-01-31 | 清华大学 | Method for preparing negative active material |
| CN111574215B (en) * | 2020-05-26 | 2022-02-08 | 莆田学院 | Method for preparing yttrium aluminum garnet powder |
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| CN101112990A (en) * | 2007-07-05 | 2008-01-30 | 东北大学 | Method for co-production of white carbon black, aluminum oxide and kerogen by kerosene shale |
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| CN103172094A (en) * | 2013-03-19 | 2013-06-26 | 浙江树人大学 | Method for using waste aluminum ash and waste acid without causing pollution to environment |
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2013
- 2013-09-04 CN CN201310396927.7A patent/CN103435079B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4797270A (en) * | 1987-07-17 | 1989-01-10 | Alumina Espanola S.A. | Method for the obtention of an especial alumina from the powder produced in metallurgical alumina calcination |
| CN1807251A (en) * | 2005-01-21 | 2006-07-26 | 中南大学 | Method for extracting alumina from high silicon bauxite |
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| CN103172094A (en) * | 2013-03-19 | 2013-06-26 | 浙江树人大学 | Method for using waste aluminum ash and waste acid without causing pollution to environment |
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