Environment-friendly process for producing lithium carbonate by mixing spodumene and lithium polymer

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 a lithium polymer. The process comprises the following steps: sequentially carrying out high-temperature calcination on spodumene through a rotary kiln and cooling through a cooling kiln, adding the lithium polymer, and carrying out ball milling on the lithium polymer and the calcined spodumene through a jaw crusher and a ball mill, and roasting in an acidification kiln, cooling, size mixing, leaching, squeezing separation by a filter press, performing freezing separation of sodium sulfate, evaporation concentration, carbonization, centrifugal drying, air jet pulverization and the like to obtain the product. The spodumene and the lithium polymer are used as raw materials, the grade of the lithium polymer reaches 8.5%-12% (Li2O), the content of Al is 25.05%, the content of Mg is 1.23%, the content of Si is 0.84%, and the content of Mn is 0.69%. The lithium polymer is a novel mineral source, and the dilemma of insufficient spodumene resources is solved; 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 lithium polymer. 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. [0004] When producing lithium carbonate by the traditional process, spodumene needs to be calcined at a hi...

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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

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