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A method and system for removing impurities from lepidolite leachate

A leachate and lepidolite technology, applied in the field of metallurgy, can solve the problems of reducing energy consumption, unwillingness to change the status quo, high loss rate of lithium, rubidium, and cesium, and achieve the effect of reducing energy consumption

Active Publication Date: 2017-01-11
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For a long time, the method of removing impurities from the lepidolite leachate mainly adopts the step-by-step precipitation method by controlling the pH value. Heating, which seriously affects the recovery rate of lithium, rubidium, and cesium, and also increases energy consumption
[0004] However, in this technical field, the traditional process has been adopted, and thinking inertia has been formed. Although it is necessary to reduce the loss rate of lithium, rubidium, and cesium in the impurity removal process of the lepidolite leaching solution, it is necessary to reduce energy consumption, but the technology in the art People are unwilling to change the status quo, and no one has ever thought about how to change the status quo

Method used

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  • A method and system for removing impurities from lepidolite leachate

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: get a part of 48L above-mentioned solution, adjust pH value to be 2-2.5 (if greater than 2.5 because of pH value, there will be Fe(OH) 3 Precipitate), in the nanofiltration membrane that pressure is 25MPa, carry out the separation of monovalent ion and multivalent ion, obtain filtrate 42L (if continue to separate, then filtration speed is too slow, energy consumption increases), lithium permeability is 78.5%. After step-by-step precipitation in the stock solution bucket, the lithium in the stock solution lost 3.1%. The total yield was 96.9% and the lithium loss rate was 3.1% during the impurity removal process.

Embodiment 2

[0039] Embodiment 2: Get a portion of the above-mentioned solution of 48L, and adjust the pH value to be 2-2.5 (if the pH value is greater than 2.5, there will be Fe(OH) 3 Precipitate), in the nanofiltration membrane that pressure is 30MPa, carry out the separation of monovalent ion and polyvalent ion, obtain filtrate 42L (if continue to separate, then filtration speed is too slow, energy consumption increases), lithium permeability is 80.3%. After step-by-step precipitation in the stock solution bucket, 2.9% of lithium was lost in the stock solution. The total yield was 97.1% and the lithium loss rate was 2.9% during the impurity removal process.

Embodiment 3

[0040] Embodiment 3: get a part of 48L above-mentioned solution, adjust pH value to be 2-2.5 (if greater than 2.5 because of pH value, there will be Fe(OH) 3Precipitation), the separation of monovalent ions and polyvalent ions was carried out in a nanofiltration membrane with a pressure of 35MPa to obtain 42L of filtrate, and the lithium permeability was 82.6%. After step-by-step precipitation in the stock solution bucket, 2.6% of lithium was lost in the stock solution. The total yield was 97.4% and the lithium loss rate was 2.6% during the impurity removal process.

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Abstract

The invention discloses an impurity removal method for a lepidolite leaching solution. The impurity removal method is characterized by comprising the following steps: firstly conducting solid-liquid separation on the leaching solution to bring convenience to suction filtration; conducting separation between monovalent ions and multivalent ions to remove impurities such as Fe, Al, Mn and Mg; preferably, utilizing a ceramic membrane to conduct the solid-liquid separation to the leaching solution to remove the solid impurity from the leaching solution, and then utilizing a nanofiltration membrane to conduct separation between the monovalent ions and the multivalent ions. The impurity removal method disclosed by the invention can lower loss ratio of lithium, rubidium and cesium in the lepidolite leaching solution and meanwhile reduce energy consumption.

Description

technical field [0001] The invention relates to a method and system for removing impurities from a lepidolite leaching solution, in particular to removing impurities from a lepidolite leaching solution by an integrated membrane method and a chemical precipitation method, and belongs to the technical field of metallurgy. Background technique [0002] The lepidolite leaching solution using the sulfate method contains a large amount of impurity elements, mainly aluminum, iron, manganese, and magnesium. [0003] For a long time, the method of removing impurities from lepidolite leaching solution mainly adopts the step-by-step precipitation method by controlling the pH value. Heating, which seriously affects the recovery rate of lithium, rubidium, and cesium, and also increases energy consumption. [0004] However, in this technical field, the traditional process has been adopted, and thinking inertia has been formed. Although it is necessary to reduce the loss rate of lithium, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B26/10C22B26/12
Inventor 周健郭春平文小强杨新华普建王玉香周新华陈佩琳
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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