Method and system for enrichment of lithium from aluminum oxide plant sodium aluminate solution

Abstract

The invention discloses a method and system for enrichment of lithium from an aluminum oxide plant sodium aluminate solution. The method includes: subjecting a sodium aluminate solution containing lithium to heat exchange cooling, then reacting the cooled sodium aluminate solution containing lithium with an aluminum hydroxide adsorbent for lithium precipitation, performing filtering, then collecting the filter cake, and conducting heating for re-dissolution, filtering the re-dissolved slurry, subjecting an obtained second filter cake to pulping, then performing filtering, and conducting performing repeated countercurrent washing to obtain a third filter cake, i.e. a lithium-rich adsorbent. The system includes an adsorption component, an adsorbent preparation slot, a first centrifugal pump,a first stage heat exchanger, a second stage heat exchanger, a first filter component, a re-dissolution component, a second filter component, a second centrifugal pump, a third filter component and athird centrifugal pump. The invention for the first time puts forward and applies the adsorbent prepared by aluminum hydroxide seed crystal to the lithium-rich sodium aluminate solution to adsorb lithium, and realizes high-efficiency separation of lithium; cooling adsorption and rapid heating are utilized to realize fast and efficient separation; and adsorbent re-dissolution is utilized for further enrichment of lithium in the adsorbent to create favorable conditions for subsequent extraction of lithium salt.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for extracting high value-added lithium salt from the semen of alumina produced by Bayer method or sintering method, in particular to a method for enriching lithium from sodium aluminate solution in an alumina factory methods and systems. Background technique [0002] Lithium carbonate, an inorganic compound with the formula Li 2 CO 3 , as colorless monoclinic crystals or white powder. Density 2.11g / cm 3 , Melting point 618℃, soluble in dilute acid, slightly soluble in water, more soluble in cold water than hot water, insoluble in alcohol and acetone. Widely used in batteries, ceramic glass, lubricants, pharmaceuticals and other industries. [0003] Lithium carbonate is the basic material for the production of secondary lithium salts and lithium metal products, so it has become the most used lithium product in the lithium industry, and other lithiu...

AI Technical Summary

Problems solved by technology

[0011] It can be seen from Table 1 that Li in the products of alumina factories in central my country 2 O is generally high, usually imported alumina Li 2 O is only 0.006%. If it is estimated at 0.1%, the alumina production is estimated at 12 million tons / year, and the Li 2 O is as high as 12,000 tons. These lithium resources have not been rationally utilized. What's more, the lithium enrichment in the electrolyte of the electrolysis plant that uses lithium-rich alumina as raw material for a long time exceeds a reasonable range, which leads to the deterioration of the working conditions of the electrolysis cell, which in turn has to be limited Lithium-rich alumina

[0012] After checking the relevant literature at home and abroad, there is no report on the enrichment of lithium from the sodium aluminate solution in the alumina factory

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