Method for comprehensively utilizing lepidolite mineralogical reconstruction lithium-extraction slags

A technology for extracting lithium slag and lepidolite, which is applied in the field of mineral processing, can solve the problems of comprehensive utilization of lithium extraction slag and achieve the effects of expanding comprehensive utilization rate, short treatment process, and less consumption of chemical materials and energy

Active Publication Date: 2014-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, in the existing research on lepidolite minerals, the research work on lepidolite ore phase reconstruction is mainly carried out as an important

Method used

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  • Method for comprehensively utilizing lepidolite mineralogical reconstruction lithium-extraction slags

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Experimental program
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Effect test

Embodiment 1

[0042] In the reaction kettle, the leached slag is slurried with the aluminized slag washing liquid at a liquid-solid ratio of 2:1, heated to about 90°C, and about 0.5 of the slag is added to industrial concentrated hydrochloric acid for acid leaching treatment; the treatment time is about 0.5 hours .

[0043] After the acid leaching is completed, filter and wash to separate the acid-dissolved slag and the leachate. Transfer the leaching liquid into a heating reaction kettle, heat and keep it warm to about 65°C, add -600 mesh calcium oxide powder to carry out solid phase conversion reaction, the time is about 6 hours, and the final pH value is controlled to be 9.5-10, and aluminum hydroxide is precipitated.

[0044] After the solid-liquid separation, the neutralized slag of precipitated aluminum is transferred to the heating and stirring reactor, and the neutralized slag is slurried and washed with the lithium extraction slag acid solution at a temperature of about 80°C for ab...

Embodiment 2

[0050] In the reaction kettle, the leached slag is slurried with the aluminized slag washing liquid at a liquid-solid ratio of 5:1, heated to about 50°C, and about 0.7% of the slag is added to industrial concentrated hydrochloric acid for acid leaching treatment; the treatment time is about 2 hours .

[0051] After the acid leaching is completed, filter and wash to separate the acid-dissolved slag and the leachate. Transfer the leaching solution into a heating reaction kettle, heat and keep it warm to about 40°C, add -800 mesh calcium oxide powder to carry out solid phase conversion reaction, the time is about 2 hours, and the final pH value is controlled to be 9.5-10, and aluminum hydroxide is precipitated.

[0052] After the solid-liquid separation, the neutralization slag of aluminum precipitation is transferred to the heating and stirring reactor, and the neutralization slag is slurried and washed with the acid solution of the lithium extraction slag at a temperature of ab...

Embodiment 3

[0058] In the reaction kettle, the leached slag is slurried with the aluminized slag washing liquid at a liquid-solid ratio of 3:1, heated to about 70°C, and about 0.3 of the slag volume is added to industrial concentrated hydrochloric acid for acid leaching treatment; the treatment time is about 3 hours .

[0059] After the acid leaching is completed, filter and wash to separate the acid-dissolved slag and the leachate. Transfer the leaching solution into the heating reaction kettle, heat and keep it warm to about 80°C, add -400 mesh calcium oxide powder to carry out solid phase conversion reaction, the time is about 4 hours, the final pH value is controlled to be 9-9.5, and aluminum hydroxide is precipitated.

[0060] After the solid-liquid separation, the neutralization slag of aluminum precipitation is transferred to the heating and stirring reactor, and the neutralization slag is slurried and washed with the lithium extraction slag acid solution at a temperature of about ...

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Abstract

The invention provides a method for comprehensively utilizing lepidolite mineralogical reconstruction lithium-extraction slags, wherein the technique of extracting battery-grade lithium carbonate by treating lepidolite by a mineralogical reconstruction method is set as the background of the method, and the lepidolite mineralogical reconstruction lithium-extraction leaching slags are utilized comprehensively. The lithium-extraction leaching slags are subjected to the process steps of stripping, precipitating aluminum hydroxide by a conversion method, concentrating and crystallizing calcium chloride, selecting fluorite out of acid leaching slags, and all the steps cooperate with one another to realizing economic and efficient utilization of the lithium slags together.

Description

technical field [0001] The invention relates to a mineral processing and sorting method, which belongs to the field of mineral processing. Specifically related to the phase reconstruction design of lepidolite, according to the conversion of fluorine to CaF 2 Carry out lepidolite mineral phase reconstruction design and process lepidolite, so that F in the mineral can be replaced by insoluble mineral CaF 2 It is a method for comprehensive utilization of the obtained lithium extraction slag after being fixed in solid-phase minerals and extracting compounds of metal elements such as lithium, potassium, rubidium, and cesium. Background technique [0002] Li in lepidolite 2 The O content is greater than 3.5%, which is an important resource for lithium extraction. The chemical constitution of lepidolite is K{Li 2-x Al 1+x [Al 2x Si 4-2x o 10 ](F,OH) 2} (x=0~0.5); the chemical composition of lepidolite varies greatly, usually containing SiO 2 47~60%, Al 2 o 3 22~29%, FeO...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 胡启阳李新海郭华军王志兴
Owner CENT SOUTH UNIV
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