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Method for recycling aluminum ash or aluminum slag by alkaline leaching method

A technology for aluminum ash and aluminum slag, which is applied in the field of recycling and utilization of aluminum ash and aluminum slag, and can solve problems such as the waste of aluminum resources and the environment.

Inactive Publication Date: 2021-05-11
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, metal aluminum, alumina and aluminum nitride account for more than 70% of the total mass. For a long time, aluminum ash and aluminum slag have been regarded as waste slag and piled up, which not only causes waste of aluminum resources but also brings environmental problems

Method used

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  • Method for recycling aluminum ash or aluminum slag by alkaline leaching method

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Experimental program
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Effect test

Embodiment 1

[0058] 100g of aluminum ash (with an aluminum oxide content of 72%) with a particle size of 1 to 30 μm is subjected to alkali leaching treatment for 3.0 h in a reactor filled with 250 mL of 25% sodium hydroxide solution in mass concentration, and the alkali leaching treatment The temperature is 95°C, after filtering and washing, 240mL sodium metaaluminate crude product solution is obtained;

[0059] Add 5g of calcium sulfate dihydrate to the crude sodium metaaluminate solution to carry out desilication reaction, the temperature of the desilication reaction is 95°C, the time is 3.0h, filter to obtain 232mL pure sodium metaaluminate solution (aluminum Sodium acid molar weight is 0.85mol);

[0060] After heating the pure sodium metaaluminate solution to 70°C, carbon dioxide was introduced, and filtered in a filter to obtain 42g of aluminum hydroxide crystals;

[0061] The aluminum hydroxide crystal is roasted, the temperature of the roasting is 1230° C., and the time is 3 hours ...

Embodiment 2

[0063] 100g of aluminum ash (with an aluminum oxide content of 72%) with a particle size of 1 to 30 μm was subjected to alkali leaching treatment for 3.5 hours in a reactor filled with 300 mL of a 30% sodium hydroxide solution, the alkali leaching treatment The temperature is 240°C, after filtering and washing, 280mL sodium metaaluminate crude product solution is obtained;

[0064] Add 5g CaO·Al to the sodium metaaluminate crude product solution 2 o 3 ·6H 2 O carries out desilication reaction, the temperature of described desilication reaction is 90 ℃, time is 3h, filter, obtain 265mL pure sodium metaaluminate solution (the molar weight of sodium metaaluminate is 1.28mol);

[0065] After the pure sodium metaaluminate solution was completely reacted with 100 mL of hydrochloric acid with a concentration of 1 mol / L at 85°C, it was filtered in a filter to obtain 90 g of aluminum hydroxide crystals;

[0066] The aluminum hydroxide crystals were roasted at a temperature of 1240° ...

Embodiment 3

[0068] 100g of aluminum ashes (with an aluminum oxide content of 72%) with a particle size of 1 to 30 μm were subjected to alkali leaching treatment for 3.5 hours in a reactor filled with 320 mL of 35% sodium hydroxide solution in mass concentration, and the alkali leaching treatment The temperature is 230°C, after filtering and washing, 300mL sodium metaaluminate crude product solution is obtained;

[0069] Add 5g CaO·Al to the sodium metaaluminate crude product solution 2 o 3 ·6H 2 O carries out desilication reaction, the temperature of described desilication reaction is 90 ℃, time is 3h, filter, obtain 285mL pure sodium metaaluminate solution (the molar weight of sodium metaaluminate is 1.32mol);

[0070] After the pure sodium metaaluminate solution was completely reacted with 100 mL of hydrochloric acid with a concentration of 1 mol / L at 85°C, it was filtered in a filter to obtain 88 g of aluminum hydroxide crystals;

[0071] The aluminum hydroxide crystals are roasted ...

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Abstract

The invention relates to the technical field of recycling of aluminum ash and aluminum slag, in particular to a method for recycling aluminum ash or aluminum slag through an alkaline leaching method. The method provided by the invention comprises the following steps: carrying out alkaline leaching on aluminum ash or aluminum slag in a strong alkaline solution to obtain a sodium metaaluminate crude product solution; carrying out desiliconization reaction on the sodium metaaluminate crude product solution to obtain a pure sodium metaaluminate solution; reacting the pure sodium metaaluminate solution with acid to obtain aluminum hydroxide; and roasting the aluminum hydroxide to obtain the aluminum oxide. The purity of aluminum hydroxide or aluminum oxide obtained through the method is high, resource regeneration of aluminum ash or aluminum slag can be well achieved, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of recycling aluminum ash and aluminum slag, in particular to a method for recycling aluminum ash or aluminum slag by alkali leaching. Background technique [0002] Aluminum ash is the dust produced by the oxidation of some substances in the process of melting and casting aluminum ingots in aluminum factories, and is an industrial waste formed after collection. The newly produced aluminum ash is called primary aluminum ash, which has a high aluminum content, and the residue after aluminum extraction is called secondary aluminum ash. Its chemical composition is: about 3-8% metal aluminum powder, 5- 20% aluminum nitride, 20-50% aluminum oxide and other metal oxides. Aluminum slag refers to the slag-like solid waste produced in the process of furnace cleaning and overhaul. Due to the different formation conditions, their chemical composition is also different. But all contain a variety of minerals formed by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/0693C01P2006/80
Inventor 马新伟贺超男徐成昊武瑾荷马世驭
Owner HARBIN INST OF TECH AT WEIHAI
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