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Comprehensive utilization method of aluminum-containing minerals

A technology of minerals and mineral raw materials, applied in the field of comprehensive utilization of aluminum-containing minerals, can solve problems such as unfavorable comprehensive utilization of iron and rare earth elements, red mud alkali pollution, loss of sodium and aluminum, and achieve the effect of avoiding pollution and corrosion problems

Inactive Publication Date: 2012-01-25
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems caused by this are mainly reflected in: (1) In addition to quartz sand, a considerable amount of silicon exists in the dissolved slag (or red mud) in the form of desiliconization products (silicon slag), which will cause sodium and aluminum At the same time, it causes alkali pollution of red mud; (2) The sodium-silicon slag in the dissolved slag is a crystallization product, which will be evenly coated on the surface of hematite, rare earth minerals and other components, which is not conducive to the iron and rare earth Comprehensive utilization of elements

Method used

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  • Comprehensive utilization method of aluminum-containing minerals
  • Comprehensive utilization method of aluminum-containing minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 100 g of dry red mud from an alumina plant in Shandong, and mix it with Na 2 o k Concentration 500 g / L lye 2 L mixed and heated to 20 o C, stirred for 8 h. After solid-liquid separation, 1.9 L of eluate was obtained, in which SiO 2 and Al 2 o 3 The content of zeolite is 6.54 g / L, 7.72 g / L, and the dissolution rate is 64% and 82% respectively; The zeolite product was obtained under hydrothermal conditions; 72.29g of the solid phase was obtained after dissolution, in which Fe 2 o 3 、TiO 2 The content reaches 46.42% and 2.35% respectively, SiO 2 The content is 9.51%, identified by XRD as SiO 2 Predominantly exists in the less reactive form of quartz. Quartz and iron oxide in the solid phase can be separated well. After separation by chute and shaking table, the total iron content in the iron concentrate is 55.05%.

[0035] Table 1 Composition in samples before and after dissolution

[0036] sample SiO 2 Fe 2 o 3 al 2 o 3 Na 2 o TiO...

Embodiment 2

[0038] The A / S of some bauxite in Henan was only 4.31, and 1000 g of the sample below 100 mesh was taken, and Na 2 o k Concentration 450 g / L lye 25 L mixed and heated to 220 o C, stirred for 5 h. After solid-liquid separation, 24.86 L of solution was obtained, in which SiO 2 and Al 2 o 3 The contents of 3.92 g / L and 21.19 g / L respectively; the dissolution liquid enters the alumina production process to prepare alumina, and the desilication product is adjusted and used to prepare zeolite; 375.12 g of dissolution slag is obtained by dissolution, the main element of which is CaO, and Residual SiO 2 and Al 2 o 3 , while rare earth elements such as Ce are also enriched.

[0039] Table 2 Composition in samples before and after dissolution

[0040] sample SiO 2 Fe 2 o 3 al 2 o 3 Na 2 o Ce CaO Bauxite, % 13.53 4.36 57.89 0.78 172.93×10 -4 15.44 Eluate, g / L 3.92 0.002 21.19 450.21 --- 0.06 Solid Phase,% 9.88 11.74 13...

Embodiment 3

[0042] Take 1000 g of bauxite from somewhere in Guigang, Guangxi, and mix it with Na 2 o k Concentration 200 g / L, α k =1.5 sodium aluminate lye 10 L mixed and heated to 220 o C, stirred for 0.5 h. After solid-liquid separation, 9.7 L of solution was obtained, in which SiO 2 and Al 2 o 3 The contents of the solution are 6.45 g / L and 289.11 g / L respectively; after desiliconization of the dissolution solution, part of the solution returns to the dissolution process, and part of it enters the alumina production process to prepare alumina, and the desilication slag is used to prepare zeolite after adjustment; the dissolution slag is obtained by dissolution 552.85g, the main element of which is Fe 2 o 3 , can be used directly as iron concentrate.

[0043] Table 3 Composition in samples before and after dissolution

[0044] sample SiO 2 Fe 2 o 3 Al 2 o 3 Na 2 o TiO 2 CaO Bauxite, wt% 8.54 43.67 45.89 1.53 2.30 3.45 Eluate, g / L ...

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Abstract

The invention provides a comprehensive utilization method of aluminum-containing minerals and relates to a comprehensive utilization method of silicon, aluminum, ferrum, sodium, rare-earth elements and the like in bauxite, red mud, kaolin and the like. The comprehensive utilization method is characterized by comprising the following steps: carrying out silicon and aluminum dissolving reaction on an aluminum-containing mineral raw material, and then directly carrying out solid-liquid separation to obtain a solid phase A and a dissolving liquid phase, wherein the solid phase A can be used as iron ore concentrate or for other purposes; adding lime or other substances in the dissolving liquid phase so that a silicon compound in the solution turns into silicon slag solid phase B, wherein the silicon slag B obtained by reaction is used for preparing zeolite or for other purposes, and a part of the obtained sodium aluminate solution enters into an alumina process to produce alumina, and the other part of the obtained sodium aluminate returns to the dissolving step. According to the invention, most of dissolving liquid returns to the dissolving process after desilication, and a part of the dissolving liquid is used for producing products such as alumina or sodium aluminate and the like; the solid phase is mainly rich in Fe2O3 and rare-earth minerals, thereby being beneficial to further comprehensive utilization; and elements such as silicon, aluminum, sodium, ferrum and the like in the minerals can be well used. Thus, the method provided by the invention has good economic benefits and social benefits.

Description

technical field [0001] A method for comprehensive utilization of aluminum-containing minerals relates to a method for comprehensive utilization of silicon, aluminum, iron, sodium, rare earth elements, etc. in materials such as bauxite, red mud, and kaolin. Background technique [0002] The grade of bauxite resources in my country is generally low. Appropriate comprehensive utilization technology can realize the comprehensive utilization of various elements and create good economic and environmental benefits. Red mud is an industrial solid waste produced after alumina is extracted from bauxite. Every ton of alumina produced will produce 0.6-2.0 tons of red mud. Red mud contains a variety of valuable elements (such as iron, aluminum, sodium, etc.), and a large amount of accumulation will not only pollute the environment, but also a waste of resources. [0003] Now there are many patents or periodical materials about the comprehensive utilization of red mud and bauxite, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14B09B1/00
Inventor 李旺兴陈湘清刘万超于延芬闫琨和新忠鲍春
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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