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Crystal form transformation method for suspension roasting of natural spodumene

A technology of suspension roasting and conversion method, which is applied in the field of lithium extraction from ores, can solve the problems of difficult control of fluidized bed fluidization distribution, large and complex equipment, difficult temperature control, etc., and achieves easy comprehensive recycling, low equipment investment, and difficult material melting effect

Inactive Publication Date: 2018-02-27
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a crystal form conversion method for natural spodumene suspension roasting, which overcomes the problems of large equipment and difficult temperature control in the rotary kiln roasting crystal conversion process; and also overcomes the need to use a gas distribution device during fluidized bed roasting It has the advantages of simple equipment, low equipment investment, low energy consumption, large processing capacity, easy control of crystal transformation temperature, and more complete crystal transformation.

Method used

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  • Crystal form transformation method for suspension roasting of natural spodumene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Grind natural α-spodumene (lithium oxide content 1.5%) into spodumene powder with an average diameter of 0.15 mm; then put it into the secondary suspension roaster, and use the 950 ℃ high-temperature tail gas for fluidized drying and preheating, so that the temperature of the spodumene powder reaches 150°C and the water content is less than 2%, and then the dried and preheated spodumene powder and high-temperature tail gas are passed into the secondary cyclone dust collector for degassing Solid separation, after the tail gas obtained from the separation is separated from the gas and solid by the dust collector, the collected preheated stone powder and the preheated stone powder separated in the secondary cyclone dust collector are introduced into the first-stage suspension roaster together, and are separated from the bottom of the first-stage suspension roaster. The 1000°C high-temperature gas obtained from the combustion chamber is rapidly mixed (the flow direction of t...

Embodiment 2

[0025] Grind natural α-spodumene (2.4% lithium oxide content) into spodumene powder with an average diameter of 0.1mm; then put it into the secondary suspension roaster, and use the 1100 ℃ high-temperature tail gas for fluidized drying and preheating, so that the temperature of the spodumene powder reaches 400 °C and the water content is less than 2%, and then the dried and preheated spodumene powder and high-temperature tail gas are passed into the secondary cyclone dust collector for degassing Solid separation, after the tail gas obtained from the separation is separated from the gas and solid by the dust collector, the collected preheated stone powder and the preheated stone powder separated in the secondary cyclone dust collector are introduced into the first-stage suspension roaster together, and are separated from the bottom of the first-stage suspension roaster. The high-temperature gas at 1100°C obtained from the combustion chamber is rapidly mixed (the flow direction o...

Embodiment 3

[0027]Grind natural α-spodumene (4.3% lithium oxide content) into spodumene powder with an average diameter of 0.06mm; then put it into the secondary suspension roaster, and use the 1000 ℃ high-temperature tail gas for fluidized drying and preheating, so that the temperature of the spodumene powder reaches 200°C and the water content is less than 2%, and then the dried and preheated spodumene powder and high-temperature tail gas are passed into the secondary cyclone dust collector for degassing Solid separation, after the tail gas obtained from the separation is separated from the gas and solid by the dust collector, the collected preheated stone powder and the preheated stone powder separated in the secondary cyclone dust collector are introduced into the first-stage suspension roaster together, and are separated from the bottom of the first-stage suspension roaster. The high-temperature gas at 1150°C obtained by the combustion chamber is rapidly mixed (the flow direction of t...

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Abstract

The invention provides a crystal form transformation method for suspension roasting of natural spodumene. The crystal form transformation method comprises the following steps: after grinding natural alpha-spodumene to a certain grain size, throwing in a secondary suspension roasting furnace for fluidized drying and preheating, and then after conducting gas-solid separation by a secondary cyclone dust collector and a dust separator in sequence on the preheated spodumene powder, throwing in a primary suspension roasting furnace for suspension roasting at high-temperature gas, so as to enable thespodumene powder to conduct primary crystal form transformation; and after separation by a primary cyclone dust separator, placing high-temperature mineral powder in a heat insulation tank to complete the crystal form transformation, and finally transferring in a cooler for cooling to obtain beta-spodumene. A suspension roasting bed is adopted for roasting, and the crystal form transformation method has the advantages that equipment is simple, equipment investment is small, energy consumption is low, treatment capacity is high, the crystal form transformation temperature is easily controlled,and the crystal form transformation is more complete.

Description

technical field [0001] The invention relates to the technical field of lithium extraction from ores, and more specifically relates to a crystal form conversion method for natural spodumene suspension roasting. Background technique [0002] Lithium and lithium salts have been expanded from traditional application fields such as glass ceramics, electrolytic aluminum, grease, refrigeration, etc. to high-tech fields such as aluminum-lithium alloys, lithium batteries, nuclear fusion, etc., especially the explosive potential of new energy for high-efficiency batteries. The increase in demand poses an urgent challenge to the technological progress of the lithium salt industry. Research on new lithium mineral extraction technology is of great significance to the development of new energy sources in the world. [0003] Natural spodumene generally needs to be converted from α-type crystal form to β-type crystal form at high temperature to carry out subsequent lithium extraction. The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B1/02
CPCC22B1/02C22B26/12Y02P10/20
Inventor 旷戈刘瑜李付杰邢盛洲陈玉红汤军军
Owner FUZHOU UNIV
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