Novel method for spodumene calcining transformation

A technology of spodumene and spodumene concentrate, which is applied in the direction of lithium halide, lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., which can solve the heat transfer of high-temperature calcination in rotary kiln Poor performance, huge tail gas dust collection system, prone to local sintering and other problems, to achieve the effect of saving cooling process, ball milling process and small equipment investment

Inactive Publication Date: 2008-07-23
钟辉
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  • Abstract
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  • Claims
  • Application Information

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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

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Experimental program
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Effect test

Embodiment 1

[0022] With 100 kilograms of spodumene concentrate (see Table 1 for composition), dry this ore to a moisture content of 1.2% with an airflow dryer, and its heat source is from the tail gas from the fluidized dynamic calciner, and the dried material is pulverized with a pulverizer Grind to 80% through 250 mesh, and then use the self-designed and manufactured fluidized dynamic calciner for calcination transformation. The calcination temperature is 1050°C. The heat source of the calcination furnace is to inject the hot gas generated by the combustion of heavy oil into the furnace tube. The dried spodumene concentrate is fed into the calcination furnace at a flow rate of 25Kg / min. The temperature of the hot gas at the entrance of the calcination furnace is 1300°C, the temperature of the hot gas at the outlet of the calciner is 700°C, the temperature of the material is controlled at 1050°C, the vacuum degree in the control furnace is 5000Pa, the velocity of the hot gas is 30m / s, and...

Embodiment 2

[0026] Use 100 kilograms of spodumene concentrate (see Table 1 for the composition), and dry the ore to a moisture content of 1.2% with an airflow dryer. The dynamic calciner is used for calcination transformation. The calcining temperature is 1050°C. The heat source of the calciner is the hot air generated by the combustion of heavy oil, which is injected into the furnace tube. The temperature of the hot air at the entrance of the calciner is 1500°C, the temperature of the hot air at the outlet of the calciner is 850°C, and the temperature of the material is controlled at 900°C. -1200°C, control the vacuum degree in the furnace to 6000Pa, the furnace gas flow rate to 40m / s, and the furnace gas flow rate to 200Nm 3 / min, the residence time of the material in the furnace is 20 seconds, dust is collected with a cyclone dust collector and a bag filter, the tail gas is emptied, and the calcined material is mixed with concentrated sulfuric acid at 0.27:1.0 (mass ratio) , acidified...

Embodiment 3

[0028] Use 100 kilograms of spodumene concentrate (see Table 1 for composition), and carry out calcination transformation with a small-scale rotary kiln. The calcination temperature is 1050°C. The heat source of the calcination furnace is the hot air generated by spraying pulverized coal into the kiln for combustion. The residence time of the material in the kiln is 40 minutes. The dust is collected by a cyclone dust collector and a wet dust collector. The tail gas is emptied, and the calcined material is cooled by an external cooling water cooler, then enters a ball mill to grind to 80% (mass) -200 mesh, adds concentrated sulfuric acid to stir at 0.27:1.0 (mass ratio), and acidifies and roasts at 330°C The time is 30 minutes, take it out and cool it, leaching with water at 60°C for 30 minutes according to the solid-to-liquid ratio of 1.0:2.0 (mass ratio), adjust the pH of the leaching solution to 7.5 with industrial grade calcium oxide, filter it with a vacuum filter, and use ...

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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 ...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D15/02C01D15/04
CPCY02P20/10
Inventor 钟辉马振兴
Owner 钟辉
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