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Technological method for recycling lithium from lithium-containing waste liquid of medicine and synthetic plastics industries

A process method and waste liquid technology, applied in the direction of lithium halide, lithium carbonate;/acid carbonate, etc., to achieve the effect of resource conservation, saving rare resources, and easy industrialization and application

Active Publication Date: 2015-12-09
江西环锂新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery and treatment of the above-mentioned lithium-containing waste liquid is still in the research stage. How to develop a set of lithium recovery methods that are environmentally friendly, cost-controllable, and simple and easy to operate is imperative.

Method used

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  • Technological method for recycling lithium from lithium-containing waste liquid of medicine and synthetic plastics industries

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Pharmaceutical and synthetic plastic lithium-containing waste liquid raw material 1 contains 2.5g / l lithium and a pH value of 3.6. After evaporation and concentration, the lithium concentration becomes 9g / l and the pH value becomes 2.4; add sodium hydroxide to adjust the pH value to 9.5; adding an appropriate amount of sodium carbonate and then filtering; drying the filter residue at 65°C; roasting the dried filter residue at 400°C for 1.5h; passing the roasted volatiles into an incinerator for combustion treatment at 1100°C; The filter residue is slurried with water, acidified by passing into carbon dioxide; the acidification solution is passed into an anion and cation mixed resin bed for purification; the purification solution is heated and decomposed to obtain lithium carbonate precipitation, washed three times with pure water, and centrifuged to obtain pure wet lithium carbonate; The pure product of lithium carbonate is the pure product of powdery lithium carbonate, ...

Embodiment 2

[0027] Pharmaceutical and synthetic plastic lithium-containing waste liquid raw material 1, containing lithium 2g / l, pH value is 4.2, after concentrated by evaporator, lithium concentration becomes 10g / l, pH value becomes 3.6; add sodium hydroxide and sodium carbonate Adjust the pH value to 8.5 with mixed alkali; filter after feeding an appropriate amount of carbon dioxide; dry the filter residue at 75°C; roast the dried filter residue at 415°C for 2 hours; Slurry the filter residue roasted at 415°C with water, pass through carbon dioxide to acidify; pass the acidified solution into a chelating resin bed for purification; heat and decompose the purified solution to obtain lithium carbonate precipitation, wash with pure water three times, and centrifuge to obtain pure wet lithium carbonate; The pure wet lithium carbonate is dried to obtain the pure powdery lithium carbonate. The main content of lithium carbonate is 93.2%.

Embodiment 3

[0029] Lithium-containing waste liquid raw materials for pharmaceuticals and synthetic plastics No. 2, lithium content 8.5g / l, pH value 8.8, add appropriate amount of sodium carbonate and filter; filter residue is dried at 60°C; dried filter residue is roasted at 450°C for 1.5 h; Roasting volatiles are fed into an incinerator for combustion treatment at 1150°C; the filter residue roasted at 450°C is slurried with water, and then acidified with carbon dioxide; the acidification solution is passed into a chelating resin bed for purification; the purification solution is heated and decomposed to obtain lithium carbonate precipitation , washed three times with pure water, and centrifuged to obtain pure wet lithium carbonate; the pure wet lithium carbonate was acidified by adding hydrochloric acid, separated by concentrated crystallization, and dried to obtain pure powdery anhydrous lithium chloride. The main content of lithium chloride was 99.2%, the detection meets the requirement...

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Abstract

The invention discloses a technological method for recycling lithium from lithium-containing waste liquid of medicine and synthetic plastics. The technological method comprises the following steps of: (1) preparing feedstocks; (2) evaporating and concentrating the feedstocks so as to obtain crude lithium carbonate; (3) drying the crude lithium carbonate; (4) calcinating the dried lithium carbonate so as to obtain crude powdery lithium carbonate; (5) adding water into the crude powdery lithium carbonate so as to pulpify the crude powdery lithium carbonate, and introducing CO2 into the lithium carbonate slurry so as to acidify the lithium carbonate slurry; (6) performing resin purification on the acidified lithium carbonate slurry so as to obtain lithium bicarbonate purified liquid; (7) heating the lithium bicarbonate purified liquid for decomposition and washing and separating the liquid so as to obtain wet pure lithium carbonate; and (8) drying the wet pure lithium carbonate so as to obtain powdery pure lithium carbonate; or acidifying the wet pure lithium carbonate, then concentrating and crystallizing the acidified lithium carbonate, and drying the crystallized lithium carbonate so as to obtain the powdery pure lithium carbonate. The technological method disclosed by the invention is simple in process, high in recycling rate, controllable in cost, and easy to popularize and apply in industrial production. Through the recycling of the lithium-containing waste liquid resources in the medicine and synthetic plastics industry, a national precious rare resource is saved.

Description

technical field [0001] The invention relates to the field of recycling and utilization of national scarce resources, in particular to a process method for recycling lithium from lithium-containing waste liquid of medicine and synthetic plastics. Background technique [0002] Lithium metal, n-butyllithium, lithium chloride, lithium carbonate and other lithium-containing compounds have been used in the field of medicine and synthetic plastics for a long time. Due to the unique catalytic properties of lithium, it is widely used in medicine and synthetic plastics. In the synthesis process of intermediates, lithium-containing compounds are widely used, but with the completion of the intermediate synthesis process, the catalytic properties of lithium-containing compounds are also terminated, and finally the lithium-containing compounds are separated from the intermediates and flow into the sewage treatment system in the form of waste liquid. Failure to use reasonable technology to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01D15/04
Inventor 何君韦
Owner 江西环锂新能源科技有限公司
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