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A kind of method of recycling aluminum and aluminum slag to produce alumina

A technology of aluminum ash slag and alumina, which is applied in the field of recycled aluminum ash slag to produce alumina, can solve the problems of ineffective acid leaching treatment, long acid leaching time, and increased dosage, so as to reduce time, The effect of shortening the time and reducing the working time

Active Publication Date: 2020-08-04
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] CN106745130A provides a method for preparing alumina from aluminum ash slag, but when the aluminum ash slag powder is subjected to acid leaching treatment, because the acid leaching time is too long, usually 2-24h, it cannot be effectively processed in a short time. The acid leaching treatment; and after the acid leaching treatment, adding hydrogen peroxide and NaOH solution to save the pH value of the acid leaching solution will increase the dosage, thereby increasing the cost

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  • A kind of method of recycling aluminum and aluminum slag to produce alumina

Examples

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Effect test

Embodiment 1

[0035] A method for resourceful production of alumina from recycled aluminum ash slag, mainly comprising the following steps:

[0036] S1: Grinding and cleaning aluminum ash

[0037] Put the rough-filtered aluminum ash into a cleaning device for sieving, grind the aluminum ash with a particle size greater than 150 mesh, and then wash with a mixed solution of ionized water and cleaning agent according to the mass ratio of 150:2 to desalinate, Dry to obtain aluminum ash powder with a particle size of less than or equal to 150 mesh; wherein, the washing and drying conditions are: the aluminum ash to be washed and the mixed solution are cleaned according to the volume ratio of 1:2, the washing time is 1.5h, and the washing temperature is 20 ℃, the drying temperature is 50℃, the drying time is 2h, and the sieving condition is less than 150 mesh;

[0038] S2: low temperature alkaline smelting

[0039] Mix finely ground aluminum ash with NaOH and NaNO 3 The mixed smelting agent co...

Embodiment 2

[0049] Different from Example 1, it is a method for resourceful production of alumina from recycled aluminum and aluminum ash, which mainly includes the following steps:

[0050] S1: Grinding and cleaning aluminum ash

[0051] Put the rough-filtered aluminum ash into a cleaning device for sieving, grind the aluminum ash with a particle size greater than 150 mesh, and then wash with a mixed solution of ionized water and cleaning agent according to the mass ratio of 150:2 to desalinate, Dry to obtain aluminum ash powder with a particle size of less than or equal to 150 mesh; wherein, the washing and drying conditions are: the aluminum ash to be washed and the mixed solution are cleaned according to the volume ratio of 1:2, the washing time is 1.5h, and the washing temperature is 20 ℃, drying temperature 60 ℃, drying time 2h, sieving condition is less than 150 mesh;

[0052] S2: low temperature alkaline smelting

[0053] Mix finely ground aluminum ash with NaOH and NaNO 3 The ...

Embodiment 3

[0062] Different from Example 1, it is a method for resourceful production of alumina from recycled aluminum and aluminum ash, which mainly includes the following steps:

[0063] S1: Grinding and cleaning aluminum ash

[0064] Put the rough-filtered aluminum ash into a cleaning device for sieving, grind the aluminum ash with a particle size greater than 150 mesh, and then wash with a mixed solution of ionized water and cleaning agent according to the mass ratio of 150:2 to desalinate, Dry to obtain aluminum ash powder with a particle size of less than or equal to 150 mesh; wherein, the washing and drying conditions are: the aluminum ash to be washed and the mixed solution are cleaned according to the volume ratio of 1:2, the washing time is 1.5h, and the washing temperature is 20 ℃, drying temperature 80 ℃, drying time 2h, sieving condition is less than 150 mesh;

[0065] S2: low temperature alkaline smelting

[0066] Mix finely ground aluminum ash with NaOH and NaNO 3 The ...

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Abstract

The invention discloses a method for resource production of aluminum oxide by aluminum ash residues of recycled aluminum. The method comprises the following steps: grinding and cleaning the aluminum ash residues; performing low-temperature alkaline smelting; performing water leaching, and removing impurities of a leaching liquid; introducing excessive CO2 to obtain an aluminum hydroxide precipitate; and performing high-temperature roasting. Cleaning apparatus used in the method comprises a shell, a shaking device, a grinding device, a cleaning device, drying devices and a heating device; the shell comprises a grinding chamber and a cleaning chamber; the shaking device is arranged at the upper end of the grinding chamber; the grinding device is arranged in the grinding chamber; the cleaningdevice is arranged in the cleaning chamber; the two drying devices are separately arranged on the left and right sides of the upper end of the cleaning chamber; and the shaking device, the grinding device, the cleaning device, the drying devices and the heating device are controlled by an automatic PLC. The method provided by the invention has higher efficiency, shorter time and a higher resourceutilization degree.

Description

technical field [0001] The invention relates to the technical field of metal recovery and utilization, in particular to a method for recycling aluminum and aluminum ash to produce alumina. Background technique [0002] At present, my country's aluminum products mainly come from the smelting of bauxite (primary aluminum) and the regeneration of waste aluminum (recycled aluminum). Among them, primary aluminum requires high-intensity mining and consumption of bauxite resources, and its reserves have been difficult to meet the needs of aluminum and aluminum. There is a huge demand for aluminum alloys; and recycled aluminum adopts the model of "resources-production-consumption-renewable resources", using waste aluminum as raw material, and producing metal aluminum through pretreatment, melting, refining, casting and other processes, making aluminum a kind of Resources that can be recycled. Compared with primary aluminum, recycled aluminum has the advantages of simple process, low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/42
CPCC01F7/02C01F7/42
Inventor 杜建伟马英温勇张明杨贺框
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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