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Method for dissolving out to extract lithium from defluorinated lepidolite in pipeline

A lepidolite and defluorination technology, which is applied in the field of lithium extraction from ore, can solve the problem of inability to efficiently extract lithium in lepidolite, and achieve the effects of low heat loss, low energy consumption and fast flow rate

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

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the prior art cannot efficiently extract the lithium element in lepidolite, and proposes a method for extracting lithium by pipeline dissolution of defluorinated lepidolite and sulfate solution of alkali metal or alkaline earth metal

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  • Method for dissolving out to extract lithium from defluorinated lepidolite in pipeline

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Effect test

Embodiment 1

[0025] The natural lepidolite concentrate with a lithium oxide content of 4.5wt% is defluorinated by high-temperature roasting, and then crushed to a particle size of D 90 =100 μm, the obtained defluorinated lepidolite ore powder, sodium sulfate, additive CaO are slurried in the mixing tank with water in a weight ratio of 1:1:0.3, the solid-liquid weight ratio of the slurry is 1:8, and the slurry is in The preheater is preheated to a temperature of 90°C, and then pumped into the pipeline reactor, heated by a jacket or directly injected with pressurized steam for high-temperature and high-pressure dissolution reaction. The flow rate of the slurry is 5m / min, and the reaction temperature is 230°C. ℃, the reaction pressure is 2.8MPa, and the reaction time is 240min. After the reaction is completed, the slurry is cooled to 30-60℃ by heat exchange through a heat exchanger, and then solid-liquid separation is carried out to obtain lithium sulfate, sodium sulfate, potassium sulfate, an...

Embodiment 2

[0027] The natural lepidolite concentrate with a lithium oxide content of 5wt% is defluorinated by high-temperature roasting, and then crushed to a particle size of D 90 =75 μm, the obtained defluorinated lepidolite ore powder, potassium sulfate, additive CaO are slurried in the mixing tank with water at a weight ratio of 1:1:0.3, and the solid-to-liquid weight ratio of the slurry is 1:7. The preheater is preheated to a temperature of 80°C and then pumped into the pipeline reactor to heat through a jacket or directly into high-pressure steam for high-temperature and high-pressure dissolution reaction. The flow rate of the slurry is 0.5m / min, and the reaction temperature is 220°C. ℃, the reaction pressure is 2.4MPa, and the reaction time is 300min. After the reaction is completed, the slurry is cooled to 30-60℃ by heat exchange through a heat exchanger, and then solid-liquid separation is carried out to obtain lithium sulfate, sodium sulfate, potassium sulfate, and sulfuric acid...

Embodiment 3

[0029] The natural lepidolite concentrate with a lithium oxide content of 4.5wt% is defluorinated by high-temperature roasting, and then crushed to a particle size of D 90 =75 μm, obtained defluorinated lepidolite powder, sodium sulfate and calcium sulfate, additive NaHCO 3 Slurry is mixed with water in the mixing tank at a weight ratio of 1:1.5:0.1. The solid-to-liquid weight ratio of the slurry is 1:8. The slurry is pumped into the pipeline reactor and heated by jacket or directly by high-pressure steam. Carry out high temperature and high pressure dissolution reaction, the flow rate of the slurry is 4m / min, the reaction temperature is 240°C, the reaction pressure is 3.4MPa, and the reaction time is 300min. After the reaction is completed, the slurry is cooled to 40-80°C by heat exchange through a heat exchanger , and then carry out solid-liquid separation to obtain a filtrate containing lithium sulfate, sodium sulfate, potassium sulfate, rubidium sulfate and cesium sulfate....

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Abstract

The invention relates to a method for dissolving out to extract lithium from defluorinated lepidolite in a pipeline. The method comprises the following steps: blending defluorinated lepidolite ore powder, sulfate of alkaline metal or alkaline earth metal, an additive and water according to the ratio to obtain slurry; after pre-heating the paste through a pre-heater, directly conveying the slurry into a pipeline reactor by utilizing a pump and carrying out high-temperature and high-pressure dissolving-out reaction; after reacting, cooling and recycling heat; carrying out solid-liquid separationon the slurry and washing; concentrating filtrate and removing impurities; adding sodium carbonate lithium-settling crystals to obtain a lithium salt product; circulating a lithium-settling mother solution until ingredients are blended to form slurry or sodium separation is carried out; then recycling potassium sulfate, rubidium sulfate and cesium sulfate. The method provided by the invention hasa simple system structure; compared with other lepidolite dissolving-out and lithium extraction technologies, the pipeline reactor is not provided with a mechanical stirring device and high pressureis easy to realize; the method has the advantages of less investment, low cost, small energy consumption and capability of comprehensively utilizing reaction dreg. The method is green and environmentally friendly, has high economic benefits and has an industrial production and application prospect.

Description

technical field [0001] The invention belongs to the technical field of extracting lithium from ores, and in particular relates to a method for extracting lithium by defluorinated lepidolite pipe stripping. Background technique [0002] Lithium has various excellent properties. Lithium and lithium salts have been widely used in high-tech fields such as aluminum-lithium alloys, lithium batteries, and nuclear fusion. Lithium resources are mainly stored in salt lake brine and ore. my country is rich in lepidolite resources, mainly distributed in Jiangxi. At present, the ore lithium extraction technology mainly includes sulfate method, limestone method and sulfuric acid method. These methods all have disadvantages such as high production cost, high energy consumption, and large amount of slag. development is of great significance. [0003] Lepidolite is a fluorine-containing lithium-containing mineral with a dense structure, and the fluorine in the mineral will affect the yield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01D5/00C01D17/00
CPCC01D15/08C01D5/00C01D17/003
Inventor 旷戈陈玉红李付杰汤军军刘瑜邢盛洲
Owner FUZHOU UNIV
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