Process for preparing lithium carbonate from spodumene

Abstract

The invention discloses a process for preparing lithium carbonate from spodumene. The process comprises the following steps of crushing, grinding and sieving the spodumene to be 100 to 150 microns, soas to obtain primary raw ore powder; putting the primary raw ore powder into a program control box type electric furnace to carry out crystal form transformation calcination, so as to obtain a primary calcined raw material; grinding the primary calcined raw material, obtaining acidized clinker, carrying out hot processing on the acidized clinker in a fluidized bed reactor, transforming the acidized clinker to be in a dissoluble form used for separating lithium, then filtering, transmitting the filtered acidized clinker in a process pipeline in a manner of reversely flowing with a hot-processgas moved out from the fluidized bed reactor, and enabling the hot gas to be directly in contact with the acidized clinker; introducing a carbon dioxide gas into a hydrogenation reaction kettle to transform the lithium carbonate into a lithium hydrogen carbonate solution, and carrying out a reaction, so as to obtain a carbonated solution; heating the lithium hydrogen carbonate solution subjected to impurity removal to boil, filtering, washing and drying to obtain required battery-grade or high-purity lithium carbonate.

Description

technical field [0001] The invention relates to a method for preparing lithium carbonate, in particular to a process for preparing lithium carbonate from spodumene. Background technique [0002] Due to its strong electrochemical activity and being a light metal, lithium has a wide range of uses. At present, the application fields of lithium include: ceramics and glass, synthetic rubber, aluminum production, plastics, pharmaceuticals, lubricants, air conditioners, televisions (fluorescent screens), lithium batteries, lithium alloys and nuclear industry, etc.; consumption reaches tens of thousands of tons per year , and still growing. In the world's total lithium resources, brine lithium ore accounts for about 75%, and hard rock lithium ore accounts for 25%. In my country's total lithium resources, brine lithium ore accounts for about 72%, and hard rock lithium ore accounts for 28%. [0003] As the main raw material for preparing other lithium salts, lithium carbonate is an ...

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Problems solved by technology

In addition, high energy demands and large quantities of fuel increase CO2 emissions