Clean production technology and method for lithium sulfate

A clean production and production method technology, applied in the direction of lithium sulfate/sulfite, etc., to achieve the effect of simple impurity removal process, reduction of impurity types and impurity content, and increase of leaching rate

Inactive Publication Date: 2018-08-10
天津二八科技股份有限公司
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Problems solved by technology

[0003] Aiming at problems such as long process route for extracting lithium from ore, waste of acid and alkali, etc., the present invention provides a clean production technology and production method for producing lithium sulfate from lithium ore, which realizes water recycling, zero discharge, and crystallization of potassium sulfate and sodium sulfate Used as a supplementary additive, it solves the problems of environmental protection and waste in the production process, and has good economic benefits

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  • Clean production technology and method for lithium sulfate

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Embodiment Construction

[0022] The invention has simple technological process, small amount of acid and alkali, material and energy recycling, realizes recycling of industrial waste water, zero discharge, and crystallizes potassium sulfate and sodium sulfate as supplementary additives, which is a typical practical clean production technology. The following is illustrated with specific examples:

[0023] 1. Screening: Screen the lepidolite ore with a 100-mesh iron sieve. If there are large particles, crush the large particles and sieve to obtain lepidolite ore powder that meets the requirements.

[0024] 2. Mixing: Mix the sieved lepidolite and roasting additive according to the mass ratio of 1:0.5, and stir evenly.

[0025] 3. Granulation: Stir the mixture with an appropriate amount of water, and granulate with a granulator to form a ball with a diameter of 10mm.

[0026] 4. Roasting: put the pellets into a roasting kiln for roasting, the roasting temperature is 920°C, and the roasting time is 20 mi...

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Abstract

The invention provides a clean production technology and method for lithium sulfate. A technique and a roasting additive are used. The production process comprises the steps of sieving, mixing, granulating, roasting, soaking, impurity deposition, crystalizing, drying and the like, and the roasting additive comprises components including Na2SO4, K2SO4, CaCO3, CaO and the like. By the clean production technology and method for lithium sulfate, the roasting conversion rate and leaching rate of lithium can be increased, moreover, acid is not used, types and contents of impurities in leaching liquid are less, a follow-up impurity removal process is simple, and acid and alkali consumption is low. The production process is simple, the lithium extracting rate is high, energy and materials are reused, and thus, the clean production technology and method are suitable for large-scale production.

Description

technical field [0001] The invention relates to a clean production technology of lithium sulfate and a production method thereof. Background technique [0002] At present, the raw materials for extracting lithium are mainly lithium-containing brine and lithium ore. The use of brine to extract lithium is subject to technical reasons, which makes the extraction of magnesium and boron difficult, the production process is complicated, and the purity of the extracted product is not high. Therefore, the current domestic production of battery-grade lithium carbonate mainly relies on lithium ore to extract lithium. However, to produce battery-grade lithium carbonate, high-purity lithium sulfate must be obtained in advance. The raw materials for extracting lithium from lithium ore depend on imports and the price is high. In order to obtain a higher extraction rate, a large amount of strong acid such as concentrated sulfuric acid is used for leaching. Magnesium, calcium and other im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/06
CPCC01D15/06C01P2006/80
Inventor 焦明月焦明伟
Owner 天津二八科技股份有限公司
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