PRODUCTION METHOD OF HIGH PURITY COBALT CHLORIDE AQUEOUS SOLUTION

• Main Authors: NAKAGAWA HIDEKAZU, SHINGU MASAHIRO, FUJI AKIKO, HAYATA JIRO
• Format: Patent
• Language: English; Japanese
• Published: 06.02.2020
• Subjects: APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS; PRODUCTION AND REFINING OF METALS; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

To provide an efficient production method of a high purity cobalt chloride aqueous solution of a low Mg concentration.SOLUTION: The production method of a high purity cobalt chloride aqueous solution is comprised of a solvent extraction step S1 and solution cleaning steps S2-S4. The solvent extraction step S1 is comprised of an extraction stage S11 of mixing an amine-based extraction agent in a nickel chloride aqueous solution containing Co and MG and thus extracting Co into an organic phase to obtain a nickel chloride aqueous solution without Co, a washing stage S12 of washing the organic phase with a washing fluid, and a back extraction stage S13 of back extracting the organic phase after the washing to obtain a crude cobalt chloride aqueous solution. In the solution cleaning steps S2-S4, impurities are removed by adding cobalt carbonate slurry or the like to a mixture of the crude cobalt chloride aqueous solution and the cobalt chloride aqueous solution containing Mg. The high purity cobalt chloride aqueous solution obtained in the solution cleaning steps S2-S4 is supplied to an electrolysis step S5. An electrolysis waste solution discharged from the electrolysis step S5 is distributed to a solution for the washing fluid, a solution for a raw material for producing the cobalt carbonate, a solution for repulping the produced cobalt carbonate, and a solution to be concentrated by evaporation for feeding to the electrolysis step.SELECTED DRAWING: Figure 1 【課題】 低Ｍｇ濃度で高純度の塩化Ｃｏ水溶液の効率よい製造方法を提供する。【解決手段】 Ｃｏ及びＭｇを含有する塩化Ｎｉ水溶液にアミン系抽出剤を混合してＣｏを有機相に抽出して脱Ｃｏ塩化Ｎｉ水溶液を得る抽出段Ｓ１１、該有機相を洗浄液で洗浄する洗浄段Ｓ１２、及び該洗浄後の有機相を逆抽出して粗塩化Ｃｏ水溶液を得る逆抽出段Ｓ１３から構成される溶媒抽出工程Ｓ１と、該粗塩化Ｃｏ水溶液と含Ｍｇ塩化Ｃｏ水溶液との混合液に炭酸Ｃｏスラリー等を添加して不純物を除去する浄液工程Ｓ２〜Ｓ４とから構成され、該浄液工程で得た高純度塩化Ｃｏ水溶液を電解工程Ｓ５に供給すると共に、該電解工程Ｓ５からの電解廃液を上記洗浄液用のものと、上記炭酸Ｃｏの生成原料用のものと、該生成した炭酸Ｃｏのレパルプ用のものと、電解給液用として蒸発濃縮するものとに分配する。【選択図】 図１