The preparation process of industrial grade lithium carbonate needs to pay attention to the following matters:
1. Raw material selection: the raw materials for the preparation of industrial-grade lithium carbonate are usually lithium pyroxene concentrate, salt lake brine, lithium mica and so on. For the selection of raw materials, its lithium grade, impurity content, mining costs and other factors should be considered to ensure that the preparation of lithium carbonate products in line with the requirements of industrial production.
2. Raw material treatment: before the preparation of industrial-grade lithium carbonate, it is necessary to carry out the necessary treatment of raw materials. For lithium pyroxene concentrate, need to grind and flotation; for salt lake brine, need to evaporation, desalination, magnesium removal and other treatments; for lithium mica, need to roast, acid leaching and other treatments. These processing steps can improve the extraction rate of lithium in the raw material and reduce the content of impurities in the product.
3. Lithium carbonate precipitation: after the treatment of raw materials, it is necessary to precipitate the lithium in solution in the form of lithium carbonate. This step is usually achieved by adding precipitant, the type and dosage of precipitant need to be selected and adjusted according to the raw materials and treatment process.
4. Product purification: after the precipitation of lithium carbonate, the product needs to be purified to further improve the purity and quality of the product. Purification methods include filtration, washing, drying and other steps, as well as the use of some physical or chemical methods to remove impurities.
5. Production safety: In the process of preparing industrial grade lithium carbonate, special attention needs to be paid to production safety. As it involves chemical reaction and high temperature equipment, operators need to have professional knowledge and skills, comply with the relevant safety regulations, to ensure timely maintenance of equipment and proper control of process parameters, in order to avoid accidents.
6. Environmental protection measures: In the process of preparing industrial-grade lithium carbonate, pollutants such as waste gas, waste water and solid waste will be generated. In order to protect the environment and comply with relevant regulations, enterprises need to take effective environmental protection measures, such as exhaust gas treatment, wastewater treatment and comprehensive utilisation of solid waste.
7. Energy consumption and cost control: The production process of industrial-grade lithium carbonate requires the consumption of a large amount of energy and raw materials, so the production process and equipment configuration should be optimised to improve the efficiency of energy use and reduce the consumption of raw materials, in order to reduce the production cost. At the same time, the production plan and marketing strategy should be reasonably arranged to avoid inventory backlog and waste.
In short, the preparation of industrial-grade lithium carbonate requires attention to a number of aspects, including raw material selection, raw material treatment, lithium carbonate precipitation, product purification, production safety, environmental protection measures, as well as energy consumption and cost control. Only when these aspects are given full attention and control, can the quality and efficiency of the preparation of industrial grade lithium carbonate be ensured.