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Processing of cobaltous sulphate/dithionate liquors derived from cobalt resource

A technology of sodium dithionite and liquid agent, which is applied in the field of recycling water and sulfate

Active Publication Date: 2019-08-16
ROCHER MANGANESE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although U.S. Patent 8,460,631 describes the processing of a liquor containing manganese sulfate and manganese dithionate (which also contains sodium sulfate and sodium dithionate), it is not apparent from this invention how sodium sulfate and sodium dithionate can be combined with sulfuric acid Cobalt is processed together with cobalt dithionate in the presence or absence of lithium sulfate and lithium dithionate

Method used

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  • Processing of cobaltous sulphate/dithionate liquors derived from cobalt resource
  • Processing of cobaltous sulphate/dithionate liquors derived from cobalt resource
  • Processing of cobaltous sulphate/dithionate liquors derived from cobalt resource

Examples

Experimental program
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Effect test

Embodiment approach 1

[0035] For Embodiment 1, refer to Figure 1-3 .

[0036] The liquor comprising cobalt sulfate and cobalt dithionate is treated with sodium carbonate to form cobalt carbonate solid and a liquor comprising sodium sulfate and sodium dithionate.

[0037] Lithium sulfate and lithium dithionate, if present, are partially precipitated with cobalt carbonate solid as lithium carbonate solid.

[0038] Solids comprising cobalt carbonate and lithium carbonate solids, if present, are removed from the carbonated liquor by filtration or centrifugation.

[0039] The solids comprising cobalt carbonate and lithium carbonate solids (if present) are washed to remove soluble impurities and to produce clean material for reuse, for example, as a positive electrode material for lithium-ion batteries.

[0040] The filtrate or centrifugate containing sodium sulfate and sodium dithionate together with the remaining lithium sulfate and lithium dithionate (if present) is treated with a crystallizer to c...

Embodiment approach 2

[0047] For the second embodiment, refer to Figure 4-6

[0048] treating a liquor comprising cobalt sulfate and cobalt dithionate with sodium hydroxide to form cobalt hydroxide solid and a liquor comprising sodium sulfate and sodium dithionate;

[0049] removing solids comprising cobalt hydroxide from the hydroxide-treated liquor by filtration or centrifugation;

[0050] Washing solids comprising cobalt hydroxide to remove soluble impurities and produce clean material for reuse, for example, as cathode material for lithium-ion batteries;

[0051] The addition of sodium carbonate to the remaining solution causes the partial precipitation of lithium (if present) as lithium carbonate;

[0052] Lithium carbonate solids are removed from the carbonated liquor by filtration or centrifugation;

[0053] Washing lithium carbonate solids to remove soluble impurities and produce clean material for reuse, such as cathode material for lithium-ion batteries;

[0054] treating the filtrat...

Embodiment approach 3

[0059] For the third embodiment, refer to Figure 7-9 .

[0060] treating a liquor comprising cobalt sulfate and cobalt dithionate with lithium hydroxide to form cobalt hydroxide solid and a liquor comprising lithium sulfate and lithium dithionate;

[0061] The lithium hydroxide may be produced by processing lithium carbonate recovered by previous operations of the process. Wietelmann et al. ("Lithium and Lithium Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag GmbH & Co, 2013, p. 24) describe the production of lithium hydroxide by reacting lithium carbonate with calcium hydroxide;

[0062] removing solids comprising cobalt hydroxide from the hydroxide-treated liquor by filtration or centrifugation;

[0063] Washing solids comprising cobalt hydroxide to remove soluble impurities and produce clean material for reuse, for example, as cathode material for lithium-ion batteries;

[0064] The addition of sodium carbonate to the remaining solution caus...

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Abstract

A process for water removal and / or recycling of sodium sulfate and / or sodium dithionate containing liquors derived from processing cobalt resource material essentially free of lithium comprising the steps of precipitation of cobalt as cobaltous carbonate or cobaltous hydroxide followed by removal thereof from the liquor, crystallization of sodium sulfate and sodium dithionate and removal of the crystals, followed by heating of the crystals to anhydrous sodium sulfate, sulphur dioxide and water and then separating the anhydrous sodium sulfate.

Description

[0001] prior application [0002] This application is a non-provisional application claiming priority from Provisional Application No. 62 / 421,139 filed November 11, 2016. technical field [0003] The present invention relates to recovery of water and sulfate from sulfate and dithionate containing liquors such as those obtained from hydrometallurgical processing of cobalt containing resource materials such as positive electrode materials from lithium ion batteries. Background technique [0004] It is well known that reducing agents such as sulfur dioxide can be used in combination with sulfuric acid to leach cobalt from higher valent cobalt containing resource materials such as cobalt(III) oxide to produce cobalt sulfate and cobalt dithionate. This is described in the following reaction: [0005] co 2 o 3 +SO 2 +H 2 SO 4 = 2CoSO 4 +H 2 o [0006] co 2 o 3 +2SO 2 +H 2 SO 4 =2CoS 2 o 6 +H 2 o [0007] Cobalt present in rechargeable lithium-ion battery cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/18C01D15/02C01D15/08C22B23/00C22B23/06C22B26/12
CPCC01G51/04C01G51/42C01G53/006C01D5/00C01D5/18C01D15/08H01M10/0525C01G51/06C01B17/64H01M2004/028Y02E60/10C01G53/06C01G53/04C01F7/02C01G45/00C01G45/02C01F7/77C02F2103/34H01M10/052
Inventor N.乔J.C-Y.琼格A.M.纳库D.D.沃肯廷
Owner ROCHER MANGANESE INC
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