Lithium slag treatment method

A treatment method, lithium slag technology, applied in sustainable waste treatment, solid waste management, lithium carbonate; Pollution hazards of land and environment, simple treatment method, and high comprehensive utilization rate

Active Publication Date: 2019-07-16
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to provide a treatment method that can absorb lit

Method used

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Experimental program
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Effect test

Embodiment 1

[0053] A kind of processing method of lithium slag:

[0054] 1. Use a sulfuric acid solution with a mass concentration of 30% to carry out acid leaching on the lithium slag at a temperature of 90°C. The liquid-solid mass ratio of the sulfuric acid solution to the lithium slag is 4:1. After 1 hour of acid leaching, filter to obtain the leaching solution. In the lithium slag, 88 Lithium, Rubidium, Cesium, Potassium, Aluminum and Sodium above % are dissolved into the leach solution, and the filter cake is washed to be acid leaching residue, which is mainly quartz and gypsum, which can be used as concrete admixtures.

[0055] 2. The leaching liquid is cooled and crystallized at -10°C to obtain alum and crystallization mother liquor. Add lime milk to the crystallization mother liquor to react until the pH value is 1, stop adding lime milk, and filter to obtain the first purified liquid and the first product. The first The product is gypsum.

[0056] 3. Add milk of lime to the firs...

Embodiment 2

[0061] A kind of processing method of lithium slag:

[0062] 1. Use a sulfuric acid solution with a mass concentration of 50% to carry out acid leaching on the lithium slag at a temperature of 70°C. The liquid-solid mass ratio of the sulfuric acid solution to the lithium slag is 3:1. After 2 hours of acid leaching, filter to obtain the leaching solution. In the lithium slag, 88 Lithium, Rubidium, Cesium, Potassium, Aluminum and Sodium above % are dissolved into the leach solution, and the filter cake is washed to be acid leaching residue, which is mainly quartz and gypsum, which can be used as concrete admixtures.

[0063] 2. The leaching liquid is cooled and crystallized at a temperature of 0°C to obtain alum and crystallization mother liquor. Add lime milk to the crystallization mother liquor to react until the pH value is 2, stop adding lime milk, and filter to obtain the first purified liquid and the first product, the first product For plaster.

[0064] 3. Add milk of li...

Embodiment 3

[0069] A kind of processing method of lithium slag:

[0070] 1. Use a sulfuric acid solution with a mass concentration of 70% to carry out acid leaching of the lithium slag at a temperature of 50°C. The liquid-solid mass ratio of the sulfuric acid solution to the lithium slag is 2:1. After 3 hours of acid leaching, filter to obtain the leaching solution. In the lithium slag, 88 Lithium, Rubidium, Cesium, Potassium, Aluminum and Sodium above % are dissolved into the leach solution, and the filter cake is washed to be acid leaching residue, which is mainly quartz and gypsum, which can be used as concrete admixtures.

[0071] 2. Cool and crystallize the leaching solution at -5°C to obtain alum and crystallization mother liquor. Add lime milk to the crystallization mother liquor to react until the pH value is 1.5, stop adding lime milk, filter to obtain the first purified liquid and the first product, the first The product is gypsum.

[0072] 3. Add milk of lime to the first puri...

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Abstract

The invention relates to a lithium slag treatment method. The method comprises the following steps: leaching a lithium slag with a first sulfuric acid solution, performing filtering to obtain a leaching solution and an acid leaching slag, performing cooling crystallization on the leaching solution to obtain alum and a crystallization mother liquor, adding a lime milk into the crystallization mother liquor and stopping the addition of the lime milk until the pH value is 1-2, and performing filtering to obtain a first purified liquid and a first product. The treatment method of the lithium slagis simple, the lithium slag comprehensive utilization rate is high, and thus the treatment method is suitable for industrial applications. Specifically, by leaching with sulfuric acid, the leaching rates of lithium, rubidium, cesium, potassium, aluminum and sodium are all above 88%, the main components in the obtained acid leaching slag are quartz and gypsum, and the quartz and gypsum can be usedas concrete admixtures for the secondary utilization.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste in the smelting industry, in particular to a treatment method for lithium slag. Background technique [0002] Lepidolite is a silicate mineral with high comprehensive utilization value and is a precious and rare mineral resource. At present, the methods for extracting lithium carbonate from lepidolite mainly include limestone sintering method, sulfate roasting method, pressure cooking method, chlorination roasting method and sulfuric acid method. Among them, after using the sulfate roasting method to extract lithium carbonate, a large amount of lithium slag will be produced. The traditional method is to only store and dispose of the lithium slag, which not only occupies land, but also easily causes environmental pollution. At present, there are no effective measures for the disposal of lithium slag. Contents of the invention [0003] Based on this, it is necessary to pro...

Claims

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Application Information

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IPC IPC(8): C04B18/04C01D5/02C01D15/08C01F7/74C01F7/76C01F11/46
CPCC01D5/02C01D15/08C01F7/74C01F7/76C01F11/46C04B18/0427C04B18/0445Y02W30/91
Inventor 张秀峰谭秀民张利珍张永兴伊跃军马亚梦
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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