Spodumene powdery suspension preheating calcination crystal form transformation process

Abstract

The invention discloses a spodumene powdery suspension preheating calcination crystal form transformation process. A beta-type spodumene powdery finished product with the crystal form conversion rate being larger than or equal to 98% is obtained. The process comprises the following steps: firstly, by taking alpha-type spodumene as a raw material, beneficiating, crushing and grinding to obtain alpha-type spodumene fine powder of which the moisture content is less than 1%; and then preheating the alpha-type spodumene powder by the suspension preheater and performing high-temperature calcination by a suspension calcining furnace for crystal form transformation, so that material circulation re-calcination is realized through the cyclone separator and the automatic distribution valve; and finally, enabling the beta-type spodumene powdery finished product discharged from the suspension calcining furnace system to enter a suspension cooling system to be cooled. The whole process of preheating, calcining and crystal transformation of the spodumene powder and cooling of the finished beta-type spodumene powder is completed in a suspension state. The process is advanced, green and energy-saving; the automation degree is high, and intellectualization can be achieved; and the single-line production scale can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium extraction from spodumene, in particular to a crystal transformation process of spodumene powder suspension preheating calcination. Background technique [0002] Lithium is an indispensable key mineral raw material for the development of the new energy industry. It has been widely used in high-tech fields. Especially since the country has vigorously supported the development of the new energy industry, the price of lithium salt has increased by leaps and bounds. In 2018, lithium consumption in the lithium battery industry accounted for 56%, exceeding the sum of lithium consumption in other industries. Although the total amount of lithium resources in brine occupies an advantage, and the cost of extracting lithium from brine is lower than that of ore, the output of lithium extracted from ore has exceeded the output of lithium extracted from brine since 2018, and the proportion of lithium extracted ...

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Problems solved by technology

[0005] (1) The heat transfer in the rotary kiln is poor (radiation heat transfer), the calcination time is long, the temperature control is difficult, the production capacity is low, the energy consumption of the finished product is high, the equipment occupies a large area, the equipment investment is high, and the production cost is high

[0006] (2) Due to the poor heat transfer performance of high-temperature calcination in the rotary kiln, local hard sintered lumps will appear in the calcined transformed materials, which are easy to form kiln skin or produce large pieces, which will increase the power consumption of the subsequent grinding section system

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