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Comprehensive utilization method of high-aluminum-content waste alkali liquor

A technology of aluminum waste and lye, applied in the preparation of aluminum chloride, aluminum halide, alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of consumption of neutralizing agents, waste of aluminum resources and alkali resources, etc.

Inactive Publication Date: 2020-06-09
3R ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method consumes a large amount of neutralizing agents, and at the same time produces a large amount of aluminum-containing solid waste, resulting in a waste of aluminum resources and alkali resources.

Method used

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  • Comprehensive utilization method of high-aluminum-content waste alkali liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 160ml of high-aluminum-containing waste lye (the mass fraction of aluminum is 20.16% based on Al2O3, the content of free sodium hydroxide is 21.97%, and the caustic ratio is 1.39), 160ml of tap water, 7g of aluminum hydroxide crystals, and a seed crystal coefficient of 0.1. Place in a corrosion-resistant reaction kettle, stir and react at room temperature for 72 hours, and then separate the solid and liquid by suction filtration. Collect the filtrate. The obtained aluminum hydroxide was washed with water to neutrality, and baked at 130 degrees Celsius for 2 hours to obtain 54 g of aluminum hydroxide powder, and the recovery rate of aluminum hydroxide was 67.14%.

Embodiment 2

[0024] 200ml of high aluminum-containing waste lye (the aluminum is 19.86% based on the mass fraction of aluminum oxide, the content of free sodium hydroxide is 23.49%, and the caustic ratio is 1.51), 200ml of tap water, 11.4 aluminum hydroxide crystals, and a seed crystal coefficient of 0.13. Place in a corrosion-resistant reaction kettle, stir and react at room temperature for 72 hours, and then separate the solid and liquid by suction filtration. Collect the filtrate. The obtained aluminum hydroxide was washed with water to neutrality, and baked at 130 degrees Celsius for 2 hours to obtain 67 g of aluminum hydroxide, and the recovery rate of aluminum hydroxide was 63.40%.

Embodiment 3

[0026] 320ml of high-aluminum-containing waste lye (the aluminum is 19.86% based on the mass fraction of aluminum oxide, the content of free sodium hydroxide is 23.49%, and the caustic ratio is 1.51), 160ml of tap water, 41.5g of aluminum hydroxide crystals, and a seed crystal coefficient of 0.3. Place in a corrosion-resistant reaction kettle, stir and react at room temperature for 72 hours, and then separate the solid and liquid by suction filtration. Collect the filtrate. The obtained aluminum hydroxide was washed with water until neutral, and baked at 130 degrees Celsius for 2 hours to obtain 119.4 g of aluminum hydroxide, and the recovery rate of aluminum hydroxide was 56.31%.

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Abstract

The invention discloses a comprehensive utilization method of high-aluminum-content waste alkali liquor, wherein the method comprises the steps: treating aluminum-containing waste alkali generated inRaney nickel production by a seed crystal decomposition method at room temperature to obtain high-added-value aluminum hydroxide powder, and regulating the basicity of aluminum chloride obtained by carrying out a reaction on waste mud with hydrochloric acid by using the obtained filtrate to obtain a polyaluminum chloride product. The utilization of two aluminum resources, namely the high-aluminum-content waste alkali liquor and the aluminum sludge, is realized, wastes are treated by wastes, and wastes are changed into valuable things.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a comprehensive utilization method of high-aluminum-containing waste lye. Background technique [0002] Raney nickel is a catalyst widely used in many chemical fields such as hydrogenation, dehydrogenation, and dehalogenation. The main production principle and steps of Raney nickel are: mixing aluminum and nickel in a certain proportion, melting, cooling, and pulverizing to obtain an aluminum-nickel alloy, and then using a solution with a concentration of 20-40% sodium hydroxide to dissolve the aluminum in the aluminum-nickel alloy Dissolution, further centrifugation and water washing to obtain Raney nickel products. A large amount of spent caustic soda with high aluminum content will be produced during the dissolution of aluminum, and the main components of the spent soda are sodium metaaluminate and sodium hydroxide. Aiming at this high-aluminum-containing wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01F7/56
CPCC01F7/14C01F7/56
Inventor 蓝立财宋德生邓炳林陈建龙丁德才罗莉娟
Owner 3R ENVIRONMENTAL TECH CO LTD
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