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Process for extracting lithium from lithionite by fluorine chemistry

A technology of fluorine chemistry and lepidolite, which is applied in the field of lithium extraction from ores, can solve the problems of high production cost, low lithium extraction rate, and large amount of waste residue, and achieve the effects of low production cost, high lithium extraction rate, and low production energy consumption

Inactive Publication Date: 2010-11-17
江西海汇龙洲锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all carry out high-temperature calcination of lithium minerals, and then use different methods to process the calcined slag to further produce lithium salts. There are high production costs, high energy consumption, low lithium extraction rate, and large amount of waste residues. Industrial production can only be used. Outstanding issues such as high-grade spodumene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: The weight ratio of raw materials is lepidolite: additive: sulfuric acid = 1:0.1:0.5, the additive is 30% hydrofluoric acid, the pre-reaction temperature in the pre-reactor is 50°C, and the preheating time is 0.1 hour , the mixed material enters the reactor and reacts at a reaction temperature of 150-350°C for 4 hours. The reaction process gradually heats up. After the temperature reaches 350°C, the reaction ends. The pH of the solution is to remove aluminum, magnesium, calcium, iron and other ionic impurities; after the impurities are filtered out, the solution is concentrated, and lithium ions are precipitated and filtered to obtain more than 80% of the crude lithium salt product. According to the needs of the application, the corresponding refined Lithium salt.

Embodiment 2

[0028] Example 2: The weight ratio of raw materials is lepidolite: additive: sulfuric acid = 1:2:5, and the additive is 70% calcium fluoride. The pre-reaction temperature in the pre-reactor is 150°C, and the preheating time is 1 hour. The mixed material enters the reactor and reacts at a reaction temperature of 150-350°C for 4 hours. At the end, after the reaction slag is leached with water, the liquid and solid are separated to obtain a sulfate solution, and the pH of the solution is adjusted to remove aluminum, magnesium, calcium, iron and other ion impurities; after the impurities are filtered out, the solution is concentrated, and lithium ions are precipitated and filtered. Obtain more than 80% of the crude lithium salt product, and prepare the corresponding refined lithium salt according to the needs of the application.

Embodiment 3

[0029] Example 3: The weight ratio of raw materials is lepidolite: additive: sulfuric acid = 1:1:3, the additive is a mixture of 70% calcium fluoride and 30% hydrofluoric acid, and the pre-reaction temperature in the pre-reactor is 150 ℃, the preheating time is 1 hour, the mixed material enters the reactor, and reacts at a reaction temperature of 150-350 ℃ for 4 hours, and the temperature is gradually raised during the reaction process. After the temperature reaches 350 ℃, the reaction ends. Solid separation to obtain sulfate solution, adjust the pH of the solution to remove aluminum, magnesium, calcium, iron and other ion impurities; after the impurities are filtered, the solution is concentrated, filtered after lithium ions are precipitated, and more than 80% of the crude lithium salt product is obtained. According to the needs of the application, the corresponding refined lithium salt can be prepared.

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Abstract

The invention provides a process for extracting lithium from lithionite by fluorine chemistry, comprising the following steps: throwing raw materials of lithionite powder, an additive and sulfuric acid based on the weight ratio of 1: (0.1-2): (0.5-5) into a pre-reactor, and then stirring to react or simply stirring and then throwing the raw materials into the reactor to react, wherein, the additive is one or more of a fluorine-containing mineral substance, salt or acid; reaction conditions in the pre-reactor are as follows: preheating the raw materials at the temperature of 50-150 DEG C for 0.1-2 hours, and then transferring into the reactor to react at the temperature of 150-350 DEG C for 0.5-4 hours; immediately evacuating the gas generated during the reaction process; leaching the obtained reaction residue with water and then carrying out liquid-solid separation to obtain a sulfate liquor; and adjusting pH into 5.0-10.0 to eliminate ionic impurities such as aluminum, magnesium, calcium, ferrum and the like; and after the liquid-solid separation is carried out, concentrating the sulfate liquor, precipitating lithium ions and then filtering to obtain a crude lithium salt product or the corresponding refined lithium salt product as required. The process of the invention has the advantages of low reaction temperature, small production energy consumption and high lithium extraction efficiency; and various valuable components of the lithionite mineral substance can be comprehensively utilized during the production process of lithium salt.

Description

technical field [0001] The invention relates to the technical field of extracting lithium from ores, and more specifically relates to a process for chemically extracting lithium from lepidolite fluorine. 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] At present, the main raw materials for extracting lithium are salt lake brine and solid lithium minerals. China has abundant reserves of lepidolite and spodumene. The metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
Inventor 旷戈林诚王占前叶长燊林荣英
Owner 江西海汇龙洲锂业有限公司
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