Manufacturing method of lithium carbonate
I. Overview
Lithium carbonate is an important raw material for the production of chemicals, which is widely used in batteries, ceramics, glass and other fields. With the continuous development and application of science and technology, the manufacturing methods of lithium carbonate are also being improved and optimized. This article will introduce several common manufacturing methods of lithium carbonate.
II. Manufacturing methods
1. Ore method
Ore method is a common manufacturing method of lithium carbonate, mainly using lithium ore as raw material, after crushing, grinding, leaching, purification, precipitation and other processes, to produce lithium carbonate products. The specific process is as follows:
(1) Lithium ore crushing and grinding
After crushing the lithium ore to a certain size, it is added to the ball mill for grinding, so that the lithium minerals in the ore are exposed, which facilitates the subsequent leaching reaction.
(2) Leaching
The ground ore is added to leaching agents such as sulfuric acid or hydrochloric acid, and the leaching reaction is carried out at a certain temperature, so that the lithium minerals are converted into soluble lithium salts.
(3) Purification
The impurity ions, such as iron, magnesium, calcium, etc., in the leaching solution are removed by adding precipitant and adjusting pH.
(4) Precipitation
Add precipitant such as sodium carbonate or sodium hydroxide to the purified leaching solution, so that the lithium salt is converted into lithium carbonate precipitate, and the lithium carbonate product is obtained after filtration, washing, drying and other processes.
2. Salt Lake Method
The salt lake method is a method of utilizing the brine resources of salt lakes to produce lithium carbonate. The specific process flow is as follows:
(1) Brine collection
The brine containing lithium is collected from the salt lake.
(2) Removal of impurities
Remove impurity ions, such as sodium, potassium, magnesium, etc., from the brine by chemical or physical methods.
(3) Precipitation
A precipitant such as sodium carbonate or sodium hydroxide is added to the purified brine, so that the lithium salt is converted into lithium carbonate precipitate, and the product of lithium carbonate is obtained through the processes of filtration, washing and drying.
3. Recycling method
Recycling method is a method of utilizing lithium-containing wastes such as waste batteries and catalysts as raw materials to produce lithium carbonate. The specific process flow is as follows:
(1) Waste crushing and classification
The lithium-containing wastes such as waste batteries, catalysts, etc. are crushed and classified to obtain the lithium-containing components.
(2) Acid leaching
The lithium-containing component is added to a leaching agent such as sulfuric acid or hydrochloric acid, and the leaching reaction is carried out at a certain temperature, so as to convert lithium elements into soluble lithium salts.
(3) Purification
The impurity ions in the leaching solution are removed by adding precipitant and adjusting pH.
(4) Precipitation
Add precipitant such as sodium carbonate or sodium hydroxide into the purified leaching solution, so that lithium salt is converted into lithium carbonate precipitate, and then get lithium carbonate product after filtration, washing, drying and other processes.
Three, manufacturing equipment
In the manufacturing process of lithium carbonate, it is necessary to use to the crusher, ball mill, leaching tank, reactor, filter, dryer and other equipment. The selection and configuration of these equipments should be determined according to the specific production process and output to ensure production efficiency and product quality.
Four, the production environment and safety measures
The production process of lithium carbonate involves chemical reactions and high temperature and high pressure operations, so it is necessary to keep the production environment clean and dry, and strictly implement the safety regulations. Meanwhile, effective fire and explosion-proof measures should be taken to ensure production safety.
V. Quality control and testing methods
In order to ensure the stable and reliable quality of lithium carbonate products, it is necessary to establish a perfect quality control system and testing methods. Through the quality control of raw materials, production process monitoring and product quality testing, to ensure that the product meets the relevant standards and requirements.
VI. Summary and Prospect
As an important raw material for the production of chemicals, lithium carbonate has been continuously improved and optimized in its manufacturing method, which has improved the production efficiency and product quality. In the future, with the continuous progress and application of science and technology, the manufacturing method of lithium carbonate will be more environmentally friendly, efficient and energy-saving.
