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Method for recovering alumina from aluminium base nickel-contained waste slag

A technology of alumina and nickel waste slag, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, preparation of alumina/hydroxide, and removal of solid waste, which can solve problems such as environmental pollution and waste. Achieve benefits to the environment, short production cycle, significant economic and social benefits

Inactive Publication Date: 2008-07-09
山东铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of waste slag is piled up, which seriously pollutes the environment. At the same time, a large amount of Al in the waste slag 2 o 3 And some valuable metals, such as nickel, vanadium, molybdenum, cobalt, etc., are not utilized and are wasted

Method used

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  • Method for recovering alumina from aluminium base nickel-contained waste slag

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Experimental program
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Effect test

Embodiment 1

[0024] The method for reclaiming aluminum oxide from aluminum-based nickel-containing waste slag of the present invention is carried out according to the following steps successively:

[0025] (1) Batching sintering: the alumina-based nickel-containing catalyst waste residue is mixed with circulating liquid caustic soda, 30% NaOH solution and Na 2 CO 3 After batching, enter the ball mill for mixing and grinding, and the proportion control [Na 2 O] / {[Al 2 o 3 ]+[SiO 2 〕} The molar ratio is 1.05, the moisture content of the slurry is 42%, the fineness is <2mm, the temperature is 47±2°C, the slurry is calcined in a rotary kiln, the calcining temperature is 1200°C±60°C, and the time is 30 minutes.

[0026] (2) Dissolution of alkaline adjustment solution and solid-liquid separation: Stir and dissolve the clinker adjustment solution in a slurryer to form a crude sodium aluminate solution, the temperature of the dissolution adjustment solution is 75±5°C, Al 2 o 3 12g / l, Na 2 ...

Embodiment 2

[0029] The method for reclaiming aluminum oxide from aluminum-based nickel-containing waste slag of the present invention is carried out according to the following steps successively:

[0030] (1) Batching sintering: combine alumina-based nickel-containing catalyst waste residue with circulating liquid caustic soda, 35% NaOH solution and Na 2 CO 3 After batching, enter the ball mill for mixing and grinding, and the proportion control [Na 2 O] / {[Al 2 o 3 ]+[SiO 2 〕} The molar ratio is 1.15, the moisture content of the slurry is 48%, the fineness is less than 2mm, the temperature is 40±2°C, the slurry is calcined in a rotary kiln, the calcination temperature is 1150°C±50°C, and the time is 45 minutes.

[0031] (2) Dissolution of alkaline adjustment solution and solid-liquid separation: Stir and dissolve the clinker adjustment solution in a slurryer to form a crude sodium aluminate solution, the temperature of the dissolution adjustment solution is 76±6°C, Al 2 o 3 14g / l, ...

Embodiment 3

[0034] The method for reclaiming aluminum oxide from aluminum-based nickel-containing waste slag of the present invention is carried out according to the following steps successively:

[0035] (1) Batching sintering: combine alumina-based nickel-containing catalyst waste residue with circulating liquid caustic soda, 50% NaOH solution and Na 2 CO 3 After batching, enter the ball mill for mixing and grinding, and the proportion control [Na 2 O] / {[Al 2 o 3 ]+[SiO 2 〕} The molar ratio is 1.12, the moisture content of the slurry is 40%, the fineness is less than 2mm, and the temperature is 36±2°C. The slurry is calcined in a rotary kiln at a temperature of 1240°C±60°C for 30 minutes.

[0036] (2) Dissolution of alkaline adjusting solution and solid-liquid separation: Stir and dissolve the clinker using adjusting solution in a slurryer to form a crude sodium aluminate solution. The temperature of the adjusting solution is 80±5°C. 2 o 3 15g / l, Na 2O 132g / l, prepared with NaOH...

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Abstract

This invention relates to a method for retrieving aluminium oxide from the aluminum-based slag with nickel, which comprises the following steps: (1) nodulizing ingredient: proportioning the aluminum-based slag with nickel, cycle alkali liquor, NaOH solution and Na2CO3, grinding the mixture in a ball grinding machine in an approximate mole proportion of Na2O / Al2O3 +SiO2 of 1.0-1.2, getting the slip into rotary kiln, calcining to get the clinker, (2) dissolving out alkaline correction liquor: dissolving out the slip by alkaline correction liquor wherein the concentration of Na2O is 130-140 g / L and Al2O3 is 10-15 g / L in alkaline correction liquor, (3) solid-liquid separating: solid-liquid separating the dissolving out liquid to get sodium aluminate crude liquid and nickel slag, (4) producing aluminium oxide: common desiliconisating the aluminate crude liquid, then disassembling, filtering and baking to get aluminium oxide production.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of aluminum-based nickel-containing waste slag, which is used for recycling Al in waste slag 2 o 3 . Background technique [0002] On the one hand, with the rapid development of electrolytic aluminum in recent years, the gap between the supply and demand of alumina in the domestic market has further widened. It is estimated that by 2005, the production capacity of electrolytic aluminum will reach 7 million tons, and the demand for alumina will reach at least 14 million tons. However, the actual production capacity of alumina in my country only reached 6 million tons in 2003, and there is a huge market gap, which needs to be filled by a large amount of imported alumina. Therefore, the production capacity of domestic alumina is also expanding rapidly. However, the consumption of domestic bauxite is also very fast, especially the high-grade bauxite has become more and more scarce. Many place...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14B09B3/00C01F7/30
Inventor 宋文清贾元平于健谢圣洪李芝顺管章峰李文成刘昌俊巩庆刚刘玮王少武史立达
Owner 山东铝业有限公司