A method for extracting lithium from clay-type lithium ore

A technology for extracting lithium and lithium ore, which is applied in the field of lithium extraction, can solve problems such as high cost, large amount of slag in the lithium extraction process, and large pollution, and achieve the effects of easy handling, improved performance, and reduced cost

Active Publication Date: 2022-05-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Avoid the problems of large amount of slag, high cost, and large pollution in the traditional lithium ore extraction process

Method used

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  • A method for extracting lithium from clay-type lithium ore
  • A method for extracting lithium from clay-type lithium ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Fill a 20cm-long circular tube with lithium-containing clay ore (containing Li 2 O content 0.62%), and the lithium-containing clay ore is compacted to a length of 10 cm, and the two ends of the lithium-containing clay ore in the circular tube are blocked with a sponge. Connect one end of the round tube to 1L containing 0.5mol / L Na 2 CO 3 +0.5mol / L NaHCO 3 The intercalation agent, which is inserted into the ruthenium-coated titanium plate anode, and the other end is connected to 1L containing 0.01mol / LNa 2 SO 4 The collector, into which the stainless steel cathode is inserted. A constant voltage of 40V (electric field strength of 2.0V / cm) was applied across the cathode and anode for electrolysis. Add Na to the intercalation agent and collector, respectively, during electrolysis 2 CO 3 and H 2 SO 4 , so that the pH of the two is controlled within the range of 6-13. After continuous electrolysis for 36 hours, the lithium concentration in the collector reached 865...

Embodiment 2

[0052] In the square electrolytic cell, two pieces of nylon cloth are used to vertically divide the cell area into three parts: the anode area, the middle area and the cathode area, and the middle area is filled with lithium-containing clay ore (containing Li 2 O content 0.44%), filled with 0.5L containing 0.005mol / L K in the anode area 2 SO 4 intercalation agent, and add 0.1mol MgCO 3 Powder, graphite plate anode inserted in the anode area; 0.5L containing 0.05mol / L KHCO in the cathode area 3 +0.05mol / L K 2 CO 3 +0.2mol / L KCl collector, insert graphite plate cathode in the cathode area. A constant voltage of 2.5V (electric field strength of 0.5V / cm) was applied across the cathode and anode for electrolysis. After continuous electrolysis for 50 hours, the lithium concentration in the collector reached 754mg / L.

Embodiment 3

[0054] Fill the 20cm long circular tube with 0.1mol / L CaCl 2 Lithium-containing clay minerals (containing Li 2 O content 0.35%), and the lithium-containing clay ore is compacted to a length of 10 cm, and the two ends of the lithium-containing clay ore in the circular tube are blocked with a sponge. Connect one end of the round tube to 1L containing 0.05mol / L Ca(HCO 3 ) 2 and 0.05mol / L CaCl 2 The intercalation agent, in which carbon fiber cloth anode is inserted, and the other end is connected to 1L collector containing 0.01mol / L NaCl, in which stainless steel cathode is inserted. A constant voltage of 2V (electric field strength of 0.1V / cm) was applied across the cathode and anode for electrolysis. After 120 hours of electrolysis, the lithium concentration in the collector reached 109mg / L.

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Abstract

The invention belongs to the field of electrochemical lithium extraction, and in particular relates to a method for extracting lithium from clay-type lithium ore, comprising the following steps: Step 1, setting up an anode area and a cathode area on both sides of the clay-type lithium ore, Insert the anode into the cathode area, insert the cathode into the cathode area; add an intercalation agent near the anode; step 2, apply a voltage between the anode and the cathode, and use the formed external electric field to drive the interlayer of clay-type lithium ore The lithium ions in the domain migrate along the direction of the electric field and gradually break away from the mineral particles, enter and concentrate in the cathode region. The beneficial effect of the present invention is that lithium can be directly extracted without pretreatment such as roasting, and without strong acid and high temperature and high pressure environment, which is energy-saving, environment-friendly, simple to operate, green and clean.

Description

technical field [0001] The invention belongs to the field of electrochemical lithium extraction, in particular to a method for extracting lithium from clay-type lithium ore. Background technique [0002] As an important energy strategic metal, lithium plays a significant role in the fields of energy storage / power battery, nuclear energy utilization, and metal materials. Driven by multiple factors such as market demand and technological development, there has been a global upsurge in research on the geological exploration, development and utilization of lithium resources. [0003] There are mainly two types of solid lithium ore, pegmatite type and clay type. Among them, the industrial development of pegmatite-type spodumene and lepidolite has become increasingly mature. The main process is to roast the minerals at a high temperature of 800-1200°C to activate and transform them, and then use sulfuric acid to leach lithium for lithium Production of salt products. [0004] Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/04
CPCC22B26/12C22B3/045Y02P10/20
Inventor 赵中伟何利华雷云涛刘旭恒孙丰龙
Owner CENT SOUTH UNIV
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