Novel environment-friendly process for producing lithium carbonate

Abstract

The invention relates to the technical field of lithium carbonate production, and particularly relates to a novel environment-friendly process for producing lithium carbonate. The process comprises the steps of sequentially carrying out high-temperature calcination on spodumene through a rotary kiln, recycling smoke dust generated in the calcination process to a double-shaft humidification stirrer for humidification treatment through a tail gas treatment system, carrying out calcination again, cooling in a cooling kiln, ball-milling in a ball mill, roasting in an acidification kiln, cooling, size mixing, leaching, carrying out squeezing separation in a filter press, carrying out freezing separation of sodium sulfate, and conducting evaporation concentration, carbonization, centrifugal drying, air jet pulverization and the like. The special double-shaft humidification stirrer is additionally arranged at the dust collecting position, dust is humidified, the risk of dust emission is reduced, and the environmental protection problem is effectively solved.

Description

technical field [0001] The present invention relates to lithium carbonate production technical field, particularly a kind of novel environment-friendly type production technology of lithium carbonate. Background technique [0002] Lithium carbonate can be used to make ceramics, drugs, catalysts, etc. Commonly used lithium-ion battery raw materials. 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. The process uses spodumene as raw material to produce lithium carbonate, which is obtained through high-temperature calcination transformation, cooling, ball milling, acidification roasting, cooling, pulping, leaching and pressing separation, freezing and separation of sodium sulf...

AI Technical Summary

Problems solved by technology

The process uses spodumene as raw material to produce lithium carbonate, which is obtained through high-temperature calcination transformation, cooling, ball milling, acidification roasting, cooling, pulping, leaching and pressing separation, freezing and separation of sodium sulfate, evaporation, carbonization, centrifugal drying and other process steps. This method requires the spodumene 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, dust is likely to be generated at the collection point and cause environmental problems. At the same time, the dust is also It also contains active ingredients, resulting in low utilization of raw materials

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