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Method for producing aluminum oxide by improved sintering process

A sintering method, alumina technology, applied in alumina/aluminum hydroxide and other directions, can solve the problem of high energy consumption, achieve the effects of low energy consumption, improve cycle efficiency and stable operation

Inactive Publication Date: 2010-06-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the one hand, the sintering technology of silicon slag alone is not yet mature, and on the other hand, it needs to be sintered at high temperature after all, so the energy consumption is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] in lye N k Under the condition of 110g / L, the silicon slag (A / S is 1.7, N / S is 0.45, Fe 2 o 3 content of 1.84%), high-iron red mud (Fe 2 o 3 content is 18%) and lime, the amount of lime added is based on the total C / S (CaO and SiO 2 The mass ratio in the solid phase) is 2.1 to add, and the amount of high-iron Bayer red mud is based on the total Fe after mixing with silicon slag 2 o 3 The content is 10% added, the reaction temperature is 280°C, and the reaction time is 30 minutes. The solid phase residue after treatment can reach an aluminum-silicon ratio of 0.73 and a sodium-silicon ratio of 0.08. The alumina recovery rate of silicon slag can reach 57%, and the recovery rate of sodium oxide The rate is up to 83%. After washing, it can be discharged directly, and the liquid phase enters the crude liquid system to adjust α k .

Embodiment 2

[0017] in lye N k Under the condition of 130g / L, add silicon slag (A / S is 1.7, N / S is 0.45, Fe 2 o 3 content of 1.84%), lime and high-iron red mud (Fe 2 o 3 Content is 24%), the amount of lime added according to C / S (CaO and SiO 2 The mass ratio) is added as 1.4, and the amount of high-iron Bayer red mud is based on the total Fe after mixing with silicon slag 2 o 3 The content is 9% added, the reaction temperature is 260°C, and the reaction time is 2 hours. The solid phase residue after treatment can reach an aluminum-silicon ratio of 0.64, a sodium-silicon ratio of 0.16, and the alumina recovery rate of the silicon slag can reach 62%. The recovery rate reaches 64%. After washing, it can be discharged directly, and the liquid phase enters the crude liquid system to adjust α k .

Embodiment 3

[0019] in lye N k Under the condition of 170g / L, add silicon slag (A / S is 1.7, N / S is 0.45, Fe 2 o 3 content of 1.84%), lime and high-iron red mud (Fe 2 o 3 Content is 38%), the amount of lime added is according to C / S (CaO and SiO 2 The mass ratio) is added as 1.5, and the amount of high-iron Bayer red mud is based on the total Fe after mixing with silicon slag 2 o 3 The content is 11% added, the reaction temperature is 240°C, and the reaction time is 2 hours. The solid phase residue after treatment can reach an aluminum-silicon ratio of 0.54, a sodium-silicon ratio of 0.11, and the alumina recovery rate of the silicon slag can reach 68%. The recovery rate is up to 75%. After washing, it can be discharged directly, and the liquid phase enters the crude liquid system to adjust α k .

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Abstract

The invention discloses a method for producing aluminum oxide by an improved sintering process, which relates to a treatment method for removing silicon slag from sintering process crude liquid during producing aluminum oxide. The method is characterized by comprising the following steps: adding alkali liquid, lime CaO and Bayer process red mud into the silicon slag of sintering process crude liquid desilication; treating the mixture; separating the treated slurry; adding the separated liquid phase into a crude liquid system for adjusting the ak of the sintering process crude liquid to ensure that the ak is stabilized; adding the solid phase into a sintering process red mud washing system; and washing the solid phase and then discharging the solid phase outside. The method of the invention solves the difficulty in wet treatment of the silicon slag, and avoids futile cycle of the silicon slag in the sintering process flow so as to reduce the reduced ratio of sintering process clinkers, improve the yield of a clinker kiln, cancel a sintering process seed decomposing system and improve the cycle efficiency of a sintering process system.

Description

technical field [0001] An improved method for producing alumina by sintering method relates to a method for treating crude liquid desiliconization slag of sintering method in the production process of alumina. Background technique [0002] In the production process of alumina, the crude liquid of the sintering method needs to undergo normal pressure, medium pressure and deep desiliconization to obtain semen with a high silicon content index before it can be decomposed to produce aluminum hydroxide. The solid phase silicon slag after desiliconization is mainly The components are sodium-silicon slag and calcium-silicon slag, which contain active ingredients alumina and sodium oxide. Discarding them will affect the recovery rate of alumina and increase the alkali consumption. At present, in industrial production, silicon slag and bauxite (and some Bayer process red mud) are generally prepared together to prepare raw slurry, and the valuable components of alumina and sodium oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 李新华尹中林顾松青武国宝
Owner GUIZHOU BRANCH CHINA ALUMINUM IND