Method for extracting lithium through secondary reverse leaching of spodumene by nitric acid

A spodumene and leaching technology, which is applied in the field of secondary reverse leaching of spodumene with nitric acid to extract lithium, can solve the problems of large slag production, inability to guarantee the extraction of lithium and other metal elements, etc., to reduce the amount of nitric acid and facilitate the realization of industrial The effect of chemicalization and short process flow

Active Publication Date: 2022-04-12
四川顺应锂材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only one leaching of spodumene after pretreatment cannot guarantee the maximum extraction of lithium and other metal elements, resulting in a very large amount of slag

Method used

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  • Method for extracting lithium through secondary reverse leaching of spodumene by nitric acid
  • Method for extracting lithium through secondary reverse leaching of spodumene by nitric acid
  • Method for extracting lithium through secondary reverse leaching of spodumene by nitric acid

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Experimental program
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Effect test

Embodiment 1

[0031] Adopt the method of the present invention to carry out lithium extraction to the spodumene raw material in table 1, specifically comprise the following steps:

[0032] S1: The spodumene raw material is ball milled so that the average particle size of the calcined material is less than 48 μm, and the spodumene is calcined at 1000° C. for 2.5 hours after ball milling;

[0033] S2: After calcination, spodumene and water are beaten according to the liquid-solid mass ratio of 2.5:1, and then nitric acid is added into the slurry according to 60wt% of the theoretical amount required for the main elements participating in the reaction, and the obtained solid-liquid mixture is carried out at a water bath temperature of 90°C One nitric acid leaching reaction, the reaction time is 3h, the solid-liquid mixture obtained after the reaction is filtered to obtain the leachate I and the leach residue I;

[0034] S3: The leaching slag I prepared in step S2 is beaten with water according ...

Embodiment 2

[0041] Adopt the method for embodiment 1 to carry out lithium extraction to the spodumene raw material in table 1, difference is:

[0042] In S1, the calcination temperature of spodumene is 980°C, and the calcination time is 1.5h;

[0043] In S2, the amount of nitric acid is 70wt% of the theoretical amount required for the main elements participating in the reaction, the liquid-solid mass ratio is 4:1, the water bath temperature is 100°C, and the leaching time is 2.5h;

[0044] In S3, the amount of nitric acid is 125wt% of the theoretical amount required for the main elements participating in the reaction, the liquid-solid mass ratio is 4:1, the acid leaching temperature is 160°C, and the leaching time is 2.5h;

[0045] In S4, MgO was added to adjust the pH of the solution to 9 and stirred for 1.5 h, and the reaction temperature was 65° C.;

[0046] In S5, the filtrate I obtained in step S4 is separated by extracting agent (t-BAMBP), diluent sulfonated kerosene, and sulfuric ...

Embodiment 3

[0049] Adopt the method for embodiment 1 to carry out lithium extraction to the spodumene raw material in table 1, difference is:

[0050] In S1, the calcination temperature of spodumene is 950°C, and the calcination time is 2h;

[0051] In S2, the amount of nitric acid is 50wt% of the theoretical amount required for the main elements participating in the reaction, the liquid-solid mass ratio is 2:1, the water bath temperature is 85°C, and the leaching time is 2h;

[0052] In S3, the amount of nitric acid is 130wt% of the theoretical amount required for the main elements participating in the reaction, the liquid-solid mass ratio is 2:1, the acid leaching temperature is 145°C, and the leaching time is 2h;

[0053] In S4, MgO was added to adjust the pH of the solution to 7 and stirred for 2 hours, and the reaction temperature was 70°C;

[0054] In S6, the filtrate I obtained in step S5 after extracting non-ferrous metals such as rubidium and cesium is concentrated and calcined,...

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Abstract

The invention discloses a method for extracting lithium from spodumene through secondary reverse leaching of nitric acid, which comprises the following steps: S1, ball-milling the spodumene, and calcining the ball-milled spodumene at 900-1300 DEG C for 1-5 hours; s2, pulping the calcined spodumene and water according to a liquid-solid mass ratio of (2.5-6): 1, then adding a proper amount of nitric acid into the slurry to carry out a primary leaching reaction for 1-6 hours, and filtering a solid-liquid mixture obtained after the reaction to obtain a leaching solution I and a leaching residue I; according to the method, the product value utilization of spodumene can be maximized, and lithium hydroxide, potassium hydroxide, nitric acid, magnesium oxide, rubidium salt and cesium salt can be prepared. The method is suitable for the field of mineral raw material treatment.

Description

technical field [0001] The invention belongs to the field of mineral raw material processing, and in particular relates to a method for extracting lithium by secondary reverse leaching of spodumene with nitric acid. Background technique [0002] In recent years, energy-saving and new energy vehicles, electric tools, electric bicycles, and new energy storage have become key areas for national investment and development. Lithium and its salts (lithium hydroxide, lithium carbonate, etc.) are the basic raw materials for the new energy industry, and spodumene contains lithium metal, the basic material for the new energy industry, and my country's lithium salt industry, especially the spodumene ore, extracts lithium The industry has strong scale and technological advantages in the world, so it is very important to optimize the development and application of spodumene. [0003] At present, lithium extraction from spodumene mainly includes sulfuric acid roasting, chloride roasting, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B1/02C22B3/06C22B3/22C22B3/26C22B26/10
CPCY02P10/20
Inventor 赵林何永但勇刘芸秀赵澎高波宋世杰李莉
Owner 四川顺应锂材料科技有限公司
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