Method for producing aluminum hydroxide by roasting bauxite at low temperature

A technology of aluminum hydroxide and low-temperature roasting, which is applied in the direction of alumina/aluminum hydroxide, aluminum silicate, and improvement of process efficiency. It can solve the problems of insufficient utilization of red mud and environmental pollution, and achieve temperature reduction, The effect of simplifying the process and equipment and reducing the production cost

Inactive Publication Date: 2019-01-29
陈湘清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, part of the red mud is used for the production of cement and other building materials, and a large amount of red mud cannot be fully and effectively utilized. It is necessary to build a red mud dam, which occupies a large area of ​​storage yard and causes serious pollution to the environment.

Method used

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  • Method for producing aluminum hydroxide by roasting bauxite at low temperature
  • Method for producing aluminum hydroxide by roasting bauxite at low temperature
  • Method for producing aluminum hydroxide by roasting bauxite at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The bauxite used is a diaspore type, the diaspore content is 80.3%, the alumina content is 65.04%, and the silicon dioxide content is 6.18%. The above contents are all percentages by mass.

[0043] The bauxite is ground and crushed, and then mixed with a caustic solution with a molecular ratio ≥ 10 to obtain a raw slurry. The prepared raw slurry has a molecular ratio of 1.05 (the molecular ratio is the molar ratio of sodium oxide to aluminum oxide), and the moisture The content is 37.5%;

[0044] The raw material slurry is sent into the roasting kiln for roasting, the roasting temperature is 600°C, the roasting time is 1 hour, and the clinker is obtained;

[0045] After the clinker is crushed, it is mixed with the adjusting liquid to carry out the dissolution reaction. After the dissolution reaction is completed, the dissolution liquid is obtained. The dissolution liquid is separated from the solid and liquid, and the obtained solid phase is mud, and the obtained liqui...

Embodiment 2

[0053] The adopted bauxite is gibbsite type, the content of gibbsite is 76.9%, the content of alumina is 67.23%, and the content of silicon dioxide is 8.01%. The above contents are all percentages by mass.

[0054] The bauxite is ground and crushed, and then mixed with a caustic solution with a molecular ratio ≥ 10 to obtain a raw slurry. The prepared raw slurry has a molecular ratio of 1.03 (the molecular ratio is the molar ratio of sodium oxide to aluminum oxide), and the moisture The content is 36.5%;

[0055] The raw material slurry is sent into a roasting kiln for roasting, the roasting temperature is 200°C, and the roasting time is 1.5 hours to obtain clinker;

[0056] After the clinker is crushed, it is mixed with the adjusting liquid to carry out the dissolution reaction. After the dissolution reaction is completed, the dissolution liquid is obtained. The dissolution liquid is separated from the solid and liquid, and the obtained solid phase is mud, and the obtained l...

Embodiment 3

[0064] The adopted bauxite is boehmite type, the content of boehmite is 82.6%, the content of alumina is 61.27%, and the content of silicon dioxide is 10.38%. The above contents are all percentages by mass.

[0065] The bauxite is ground and crushed, and then mixed with a caustic solution with a molecular ratio ≥ 10 to obtain a raw slurry. The prepared raw slurry has a molecular ratio of 1.02 (the molecular ratio is the molar ratio of sodium oxide to aluminum oxide), and the moisture The content is 35.8%;

[0066] The raw material slurry is sent into the roasting kiln for roasting, the roasting temperature is 420°C, and the roasting time is 1 hour to obtain clinker;

[0067] After the clinker is crushed, it is mixed with the adjusting liquid to carry out the dissolution reaction. After the dissolution reaction is completed, the dissolution liquid is obtained. The dissolution liquid is separated from the solid and liquid, and the obtained solid phase is mud, and the obtained l...

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Abstract

The invention belongs to the technical field of aluminum industries, and specifically discloses a method for producing aluminum hydroxide by roasting bauxite at a low temperature. The method includesmixing crushed bauxite with a caustic solution to obtain raw slurry; roasting the raw slurry with 160-890 DEG C to obtain clinkers; performing dissolution reaction on the clinkers to obtain digestionliquor, and performing solid-liquid separating on the digestion liquor, wherein a solid phase is a pug whose iron content is larger than or equal to 40%, the pug can be sold as an iron concentrate rawmaterial after washing, a liquid phase is crude liquid, and a desilication solid phase is a sodium aluminosilicate product after the desiliconization of the crude liquid; and adding aluminum hydroxide seeds into the liquid phase to perform decomposition reaction, and performing solid-liquid separating on decomposition liquid, wherein the obtain liquid phase is seeded precipitation spent liquor, and the solid phase is an aluminum hydroxide product. The method enhances decomposition rate and cyclic efficiency, and reduces energy consumption; and compared with traditional sintering methods, theroasting temperature can be obviously reduced, the method does not generate red mud, more than 70% of silicon dioxide in the bauxite is made into the sodium aluminosilicate products, and the standardof the quality of the prepared aluminum hydroxide is better than that of the aluminum hydroxide produced by the traditional sintering methods and Bayer process.

Description

technical field [0001] The invention relates to the technical field of aluminum industry, in particular to a method for producing aluminum hydroxide by roasting bauxite at a low temperature. Background technique [0002] At present, the industrial production of alumina mainly includes sintering method and Bayer method. The production of alumina by sintering mainly includes raw material preparation system, batching system, sintering system, clinker dissolution system, red mud sedimentation separation system, seed separation system or carbon separation system, evaporation system, and discharge system. The advantage of the sintering method is that the produced alumina has high whiteness and good purity, which can be widely used in various industrial fields such as chemical industry, building materials, plastics, rubber, coatings, glass fiber reinforced plastics, resins, electronics, ceramics, glass products, papermaking, and electrical insulation devices. ; The disadvantage is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01B33/26C22B1/02C22B3/44C22B21/00
CPCC01B33/26C01F7/02C01P2004/61C01P2006/65C01P2006/80C22B1/02C22B3/44C22B21/0015Y02P10/20
Inventor 陈湘清李花霞李民菁张伦和
Owner 陈湘清
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