Abrégé

Disclosed in the present invention is a method for preparing low-impurity electrolytic manganese dioxide, comprising: reacting manganese oxide ore powder, pyrite powder, industrial sulfuric acid, and a waste electrolyte; then adding calcium carbonate or extremely fine manganese oxide ore powder to remove iron, and then performing pressure filtration; adding manganese sulfide to the filtrate to remove impurities, and then performing pressure filtration; next, adding manganese fluoride to remove impurities, and performing filtering to obtain an electrolyte; then electrolyzing the obtained semi-finished electrolytic manganese dioxide product, and then performing procedures such as crushing, rinsing, pressure filtration, and drying to obtain a product. According to the method, a semi-finished electrolytic manganese dioxide product is refined, to effectively remove impurities in the product, and thus, low-impurity electrolytic manganese dioxide is obtained.

Classes IPC  ?

• C25B 1/21 - Oxydes de manganèse
• C22B 3/08 - Acide sulfurique

Abrégé

Disclosed in the present invention is a preparation method for electrolytic manganese dioxide for a mercury-free alkaline zinc-manganese battery: first mixing and reacting a portion of electrolytic waste liquid with manganese oxide powder and pyrite powder; then adding industrial sulphuric acid and the remaining electrolytic waste liquid in sequence and, after reacting, adding calcium carbonate or ultrafine manganese oxide powder to remove iron, and press-filtering to obtain a filtrate; adding barium sulphide and manganese fluoride in sequence to remove impurities to obtain a manganese sulphate electrolyte; electrolysing to obtain an EMD semi-finished product; and then crushing, rinsing, press-filtering, and drying to obtain a product. The present method can prepare an EMD product with low impurity content and high product quality.

Classes IPC  ?

• C25B 1/21 - Oxydes de manganèse
• C22B 3/08 - Acide sulfurique
• C22B 47/00 - Obtention du manganèse

Abrégé

Disclosed is a method for preparing electrolytic manganese dioxide for producing a lithium manganate material. The method comprises: firstly, mixing manganese oxide mineral powder, pyrite powder and sulfuric acid for a reaction so as to obtain a slurry; neutralizing residual sulfuric acid in the slurry with calcium carbonate powder and removing iron, then adding a sulfide mixture to remove heavy metals, and then adding a filter aid to filter off a precipitate so as to obtain solution B; and electrolyzing solution B to obtain an EMD semi-finished product, and then carrying out processes such as crushing, hot water acid washing, filter pressing, and drying, so as to obtain EMD for producing a lithium manganate material. The method of the present invention has a low cost and small energy consumption, and can produce a high-quality electrolytic manganese dioxide product.

Classes IPC  ?

• C25B 1/21 - Oxydes de manganèse
• C25B 15/00 - Conduite ou entretien des cellules
• B08B 3/08 - Nettoyage impliquant le contact avec un liquide le liquide ayant un effet chimique ou dissolvant