Environment-friendly process for producing lithium carbonate by mixing spodumene and salt lake ore

Abstract

The invention relates to the technical field of lithium carbonate production, in particular to an environment-friendly process for producing lithium carbonate by mixing spodumene and salt lake ore, which comprises the following steps: sequentially carrying out high-temperature calcination on spodumene in a rotary kiln, treating smoke dust generated in the calcination process by a tail gas treatment system, recovering dust into a double-shaft humidification stirrer, and carrying out humidification treatment, and carrying out calcining, cooling, fine grinding, acid adding reaction, cooling, size mixing, leaching, filter press squeezing separation, salt lake ore adding, purifying, filtering, causticizing, sodium sulfate re-freezing separation, evaporation and concentration, carbonization, centrifugal drying, air flow crushing and other process steps to obtain the product. According to the invention, the dilemma of insufficient spodumene resources is solved, and meanwhile, the problem of low quality of products produced by salt lake ore resources is solved; and dust is humidified through the double-shaft humidifying stirrer, the risk of dust emission is reduced, the environmental protection problem is effectively solved, effective components are recycled, and the utilization rate of raw materials is increased.

Description

technical field [0001] The invention relates to the technical field of lithium carbonate production, in particular to an environment-friendly process for producing lithium carbonate by mixing spodumene and salt lake ore. Background technique [0002] Lithium carbonate can be used to make ceramics, medicines, catalysts, etc., and is also a commonly used raw material for lithium-ion batteries. As the positive electrode material of lithium-ion batteries, the high-purity lithium carbonate used in the electrolyte has attracted more and more attention. At present, the methods for producing lithium carbonate include producing lithium carbonate from spodumene, extracting lithium from salt lake brine, and extracting lithium carbonate from seawater. [0003] However, spodumene resources are insufficient, and it is urgent to find new mineral sources to meet production needs. Salt Lake Ore Li 2 SO 4 ·H 2 The O content reaches 80.1-92.1%, with an average content of 85.1%. In the pri...

AI Technical Summary

Problems solved by technology

[0004] When producing lithium carbonate by the traditional process, spodumene needs to be calcined at a high temperature of 950-1200 ° C. The smoke generated during the calcination process passes through the tail gas treatment system to recover the dust and then calcined. However, it is easy to generate dust at the collection point and cause environmental problems. At the same time, the dust also contains active ingredients, resulting in low utilization of raw materials

Images