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Caustic Digestion Method

A caustic alkali and solution technology, applied in the field of caustic alkali digestion, can solve the problems of high energy consumption and uneconomical

Active Publication Date: 2022-03-04
LITHIUM AUSTRALIA NL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high energy consumption associated with the roasting of low-grade lithium concentrates has proven to be uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0075] Example 1a. Caustic Digestion - Lepidolite

[0076] Lepidolite (P 80 157 μm) of four samples (CL-1, CL-2, CL-3 and CL-4) were mixed (20) with different concentrations of sodium hydroxide solution to provide a mixture with a solids content of 10% by weight.

[0077] Samples CL-1 and CL-2 were heated (30°C) to 148°C to 154°C at atmospheric pressure in a conventional baffled reactor for 6 hours, and samples CL-3 and CL-4 were heated under vapor pressure in a reactor and heated to 220°C and 240°C respectively for 4 hours (caustic digestion). The operating conditions for the caustic digestion test and the resulting metal extraction results are provided in Table 1.

[0078] Atmospheric caustic digestion of samples CL-1 and CL-2 showed extraction of Li up to about 50%.

[0079] For samples CL-3 and CL-4 that underwent caustic digestion under reactor conditions, high extraction of lithium (99%) and high extraction of all other alkali metals (such as K, Rb, and Cs) were achi...

Embodiment 1b

[0080] Example 1b. Caustic Digestion - Spodumene

[0081] Li was extracted from spodumene by caustic digestion under reactor conditions of high temperature and pressure (vapor pressure only) with a residence time of 4 h monitored under similar conditions to lepidolite.

[0082] from P 80 The extraction of Li from 76 μm spodumene was 77%, which is significantly larger than that of P 80 100 μm spodumene (40% to 57%).

Embodiment 2

[0083] Embodiment 2. caustic baking

[0084] Lepidolite ore (P 80 157μm) Li extraction. A summary of the results of these two tests is presented in Table 2.

[0085] Li extraction was observed to increase from 68% to 86% as the baking temperature increased from 250 °C to 350 °C within 1 h. The more aggressive conditions in which caustic melting and typical "fusion" occur increase the overall extraction of major elements.

[0086] The resulting heated mixture was then diluted (40) to 20% by weight relative to caustic strength, followed by separation of solid and liquid.

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Abstract

The present disclosure provides methods for extracting and recovering lithium value from lithium-containing materials, particularly lithium-containing silicates such as spodumene and lepidolite. A method for extracting lithium value from a lithium-containing material includes heating a mixture of the lithium-containing material and caustic solution to up to 350°C. The mixture may be heated in a reaction vessel in the range of 200°C to 300°C. Alternatively, the mixture may be baked at a temperature ranging from 250°C to 350°C under atmospheric pressure. The heated mixture is then diluted, and aluminates and silicates are removed from the diluted heated mixture to produce a lithium-enriched solution. The lithium-enriched solution may be evaporated to increase its lithium concentration, and lithium carbonate and / or lithium hydroxide recovered from the evaporated lithium-enriched solution.

Description

technical field [0001] The present disclosure relates to a caustic digestion process for recovering lithium value from lithium-containing materials. In particular, the present disclosure relates to caustic digestion processes for the recovery of lithium carbonate and / or lithium hydroxide from lithium-containing silicates. Background technique [0002] The global supply of lithium currently originates from brine or hard rock deposits. [0003] In the former, lithium is concentrated into soluble salts by solar evaporation. Lithium produced from brines is generally low grade, and while the capital investment for brine production is high, operating costs are low. [0004] In the case of hard rock deposits, conventional mining and beneficiation techniques are used to produce high-grade spodumene concentrates. Technical lithium chemicals of battery grade (99.5%) or high purity (>99.9%) lithium carbonate can be obtained from various acid roasting and lime roasting processes. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/12
CPCC22B3/12C22B3/44C22B26/12Y02P10/20
Inventor 埃内伊·恰托维奇
Owner LITHIUM AUSTRALIA NL
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