Novel method for spodumene calcining transformation

Abstract

The invention relates to a method for producing lithium carbonate, lithium hydroxide and lithium chloride with spodumene. Aiming at the defect of the calcination transformation technology of the spodumene concentrate, the invention provides a new method of the fluidization and dynamic calcination transformation of the spodumene concentrate: the spodumene concentrate from a concentration plant is dried and milled to granules with the granularity of minus 250 meshes to minus 350 meshes; then a fluidization dynamic calcinator is adopted to carry out high temperature calcination transformation to the concentrate, the material temperature is controlled between 900 and 1200 DEG C; because the material in the furnace is fluidized and transfers heat and is delivered in the form of air delivery with hot air, the process is rapid in heat transfer rate, high in efficiency and short in calcination time, which overcomes the technical defect of the existing calcination technology that the material is easy to be agglomerated and avoids cooling and ball-milling procedures. When the calcined material is treated by the procedures of leaching, purging, filtering, etc., the obtained filtrate (raw material liquid) can be utilized for producing products such as lithium carbonate, lithium hydroxide, lithium chloride and so on by adopting existing different technologies.

Description

technical field [0001] The invention relates to a production method for producing lithium carbonate, lithium hydroxide and lithium chloride from spodumene. Background technique [0002] Lithium and its compounds have unique physical and chemical properties, and are widely used in the fields of energy, chemical industry, atomic energy, ceramics, metallurgy, etc., especially in lithium batteries, making the market's main products of lithium - lithium carbonate, hydroxide The consumption of lithium and lithium chloride has increased sharply, and the market price has doubled. Therefore, it is of great significance to invent a new and economically feasible method for producing lithium products from spodumene concentrate. [0003] To produce lithium carbonate, lithium hydroxide or lithium chloride from spodumene, the current domestic process route and principle are: [0004] [0005] Using spodumene as raw material, no matter producing lithium carbonate, lithium hydroxide or ...

AI Technical Summary

Problems solved by technology

[0006] 1. Rotary kiln high temperature calcination has poor heat transfer performance, long calcination time, low production capacity, high energy consumption, large equipment investment and high cost

[0007] At present, the internal heating rotary kiln widely used in the lithium industry is used for transformation and calcination of spodumene. The material is slowly rotated in the kiln from the kiln tail to the kiln head to contact with the heating gas to transfer heat, and gradually heat up to about 1100 ° C. Due to the slow heat transfer rate , the calcination time is about 30-120 minutes, the heating uniformity of the material is poor, and local sintering is prone to occur, the transformation rate of the material can only reach 95-97%, and the consumption of clean coal (≥7400Kcal / Kg) is large, which makes the production cost Very high; and the equipment is bulky, its diameter is generally about 2 meters, the length is 35-40 meters, the investment is large, and the power consumption is high;

[0008] 2. The exhaust gas dust collection system is huge and the investment is high

[0009] At present, the dust collection system of rotary kiln generally adopts cyclone dust collection and wet dust collection, which are bulky, occupy a large area, and have poor economy;

[0010] 3. Ball mill ball milling material has high energy consumption, large investment and high noise

[0011] The ball mill is mainly used for crushing materials with high hardness. This equipment has high energy consumption, large investment and high noise.

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