Lithium carbonate is a common lithium salt, widely used in chemical industry, metallurgy, ceramics, glass, medicine and other fields. In the process of preparing lithium carbonate, there are a variety of raw materials that can be used as its raw material source. The following are some substances that can be used as raw materials for lithium carbonate:
1. Lithium pyroxene: lithium pyroxene is one of the main raw materials for lithium carbonate. It is a lithium-containing ore, and lithium is usually extracted by either the fire method or the wet method. The fire method is to heat the lithium pyroxene to a high temperature, so that it melts and separates out the lithium. Wet method is to use acid or alkali solution to dissolve lithium from lithium pyroxene, and then through precipitation to get lithium carbonate.

2. Lithium mica: Lithium mica is also a common lithium-bearing ore that can be used as a raw material for lithium carbonate. Unlike lithium pyroxene, lithium in lithium mica exists in the form of mica, so different extraction methods are needed. Usually flotation method is used to separate lithium mica from the ore, then lithium is dissolved by acid or alkali solution, and finally lithium carbonate is obtained by precipitation method.
3. Salt lake brine: Salt lake brine is rich in lithium resources, so it can also be used as a source of raw materials for lithium carbonate. The lithium in the brine of the salt lake exists in the form of ions, which can be separated by evaporation, concentration, precipitation and other steps, and then lithium carbonate can be obtained by precipitation method.
4. Recycling of used batteries: Used batteries contain a large number of metals and electrolytes, which also include lithium. Therefore, the lithium in recycled waste batteries can also be used as a source of raw materials for lithium carbonate. Usually, chemical dissolution, electrolysis and other methods are used to extract lithium from used batteries, and then lithium carbonate is obtained by precipitation method.

In the process of preparing lithium carbonate, it is necessary to choose a suitable extraction method according to the characteristics of the raw material and process requirements. At the same time, in order to improve the purity and yield of lithium carbonate, it is also necessary to pre-treat and refine the raw material.