Technology for extracting lithium from seawater

A technology for extracting lithium and seawater, which is applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of reducing production costs and shortage of lithium resources, and achieve the effect of reducing production costs

Inactive Publication Date: 2018-11-13
南通四度化工贸易有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the increasingly tight problem of lithium resource sources and can reduce production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 50 kg of lithium metatitanate-type lithium adsorbent with a particle size of 300-800 um. Put the lithium adsorbent into a square box with a mesh of about 200um, hang the box on the ship, and tow it in the sea for 36 hours. Hoist the box to the ship, soak the box in a tank filled with 300L dilute sulfuric acid (mass concentration 2%), move the box up and down, let the lithium adsorbent fully contact with the dilute sulfuric acid for desorption, and the desorbed The feed liquid is the enrichment liquid. Concentrate the enriched solution with a reverse osmosis membrane, add alkali to precipitate impurities, filter out the precipitate, pass carbon dioxide into the solution to precipitate lithium, and obtain 2.2 kg of lithium carbonate.

Embodiment 2

[0033] Take 50 kg of lithium metatitanate-type lithium adsorbent with a particle size of 300-800 um. Put the lithium adsorbent in a cylindrical box, and open a mesh on the top surface and the ground of the cylinder, and the mesh is about 200um. Hang the box on the ship and tow it in the sea for 48 hours. The box is hoisted to the ship, and 260L of dilute hydrochloric acid (mass concentration 2%) is used to flow from the top of the cylindrical box to the bottom for desorption, and the desorbed feed liquid is the enrichment liquid. The enriched solution was heated and concentrated, and then other metal ion impurities were removed by ion exchange resin, and potassium carbonate was added to precipitate lithium to obtain 2.1 kg of lithium carbonate.

Embodiment 3

[0035] Take 50kg of manganese dioxide-type lithium adsorbent with a particle size of 300-800um. Put the lithium adsorbent into the spherical box, and open the mesh on the outer surface of the spherical shape, and the mesh size is about 150um. Hang the box on the ship and tow it in the sea for 42 hours. Lift the box to the workshop of the seaside factory area, soak the box in the dilute hydrochloric acid tank, move the box up and down, let the lithium adsorbent fully contact with 280L dilute hydrochloric acid (mass concentration 2%) for desorption, and the desorbed material The solution is the enrichment solution. The enriched solution was heated and concentrated, and then impurities were removed with alkali, and sodium carbonate was added to precipitate lithium to obtain 2.4 kg of lithium carbonate.

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PUM

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Abstract

The invention discloses a method for extracting lithium from seawater by utilizing a lithium adsorbent. The invention in particular relates to the method comprising the following steps: adsorbing thelithium in the seawater by utilizing the lithium adsorbent; then desorbing by adopting a desorption agent to prepare a lithium-enriched solution; carrying out re-concentration, purification and lithium sedimentation on the lithium-enriched solution to obtain lithium carbonate. The technology provided by the invention provides a new raw material source for the production of the lithium carbonate and dependence on minerals and bittern is reduced, so that the production cost is greatly reduced and the technology is suitable for industrialization.

Description

technical field [0001] The invention discloses a process for extracting lithium from seawater, in particular to a process for selectively adsorbing lithium in seawater to prepare lithium carbonate. Background technique [0002] Lithium is known as "energy metal" and has been widely used in the lithium battery industry. The strong demand in the lithium battery market and the shortage of supply have led to a sharp rise in the price of lithium salts. The earth is rich in lithium resources, but the current mining areas are mainly on land, mainly ore and salt lakes. [0003] With the increasing depletion of lithium ore and salt lake lithium resources, the abundant lithium resources in seawater become very important. [0004] An important factor restricting the exploitation of lithium resources in seawater is the lithium extraction technology in seawater. The concentration of lithium ions in seawater is low (about 0.17ppm). The adsorption capacity and development process for lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 林炳旺李珣珣
Owner 南通四度化工贸易有限公司
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