摘要:
The present invention provides a manganese sulfate purification and crystallization method. The use amount and the type number of impurity removal agents used in the method of the present invention are small, a filtrate obtained after crystallization and filtration is distilled, recovered ethanol is used for circulating crystallization, a distilled liquid is used as a manganese slag leaching base solution again to be added into a reaction kettle, and sulfuric acid is added again for preparing a manganese sulfate solution by means of cyclic leaching. The process is simple and easy to implement, the additive amount is small, high-temperature crystallization is not needed, and process costs are greatly reduced.
摘要:
Provided is a method for preparing manganese sulfate, which comprises the following steps: adding sulfide with reducing ability to manganese dioxide ore by quantification according to the reaction molar ratio to fully react, determining the end-point of reaction, and then separating and washing solid product; reacting the solid product with 9-12mol/L H 2 SO 4 , controlling the end-point of reaction to pH 3-5, keeping the MnSO 4 concentration in the reaction liquid within the range of 300 - 400g/L, and then separating solid from liquid after reaction; and using H 2 SO 4 to acidify the separated solution until the pH value of the solution is 2-3, adding hydrogen peroxide and heating, finely filtering to remove solid phase, and then vaporizing, condensing, crystallizing and dewatering the filtered liquid to obtain manganese sulfate. The method enables a plurality of heavy metals to be converted into indissoluble sulfides while obtaining manganous compounds that are dissoluble in acid. At the same time, manganese sulfate low in calcium, magnesium and heavy metals is obtained.
摘要翻译:本发明提供硫酸锰的制备方法,其特征在于,通过根据反应摩尔比定量添加二氧化锰矿还原能的硫化物进行充分反应,确定反应终点,然后分离洗涤固体 产品; 使固体产物与9-12mol / LH 2 SO 4反应,控制反应终点为pH 3-5,使反应液中的MnSO 4浓度保持在300-400g / L范围内,然后分离固体 反应后液体; 并使用H 2 SO 4将分离的溶液酸化直至溶液的pH值为2-3,加入过氧化氢并加热,精细过滤除去固相,然后蒸发,冷凝,结晶和脱水过滤液体,得到 硫酸锰。 该方法能够将多种重金属转化为不溶性硫化物,同时获得可溶于酸的二价锰化合物。 同时,获得了低钙,镁和重金属的硫酸锰。
摘要:
A method for producing manganese(II) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.
摘要:
In a method for recovering an active metal of a lithium secondary battery, a cathode active material mixture is prepared from a cathode of a lithium secondary battery. A first reductive process using a first reductive reaction gas and a second reductive process using a second reductive reaction gas that has a higher reaction source concentration than that of the first reductive reaction gas are performed sequentially and continuously to convert the cathode active material mixture into a preliminary precursor mixture. A lithium precursor is recovered from the preliminary precursor mixture. A lithium recovery ratio may be increased by a stepwise reduction while preventing an increase of heating value.
摘要:
Provided is a method for preparing manganese sulfate monohydrate by desulfurizing fume with middle-low grade manganese dioxide ore, which comprises: preparing a slurry by using middle-low grade manganese dioxide ore powder, first putting sulfur-containing fume in an absorbing device and controlling gas velocity and gas-liquid ratio, and then adding manganese dioxide slurry and controlling the slurry to backwards flow relative to the sulfur-containing fume, discharging the desulfurized fume from the absorbing device, pressure-filtering and separating the slurry discharged from the absorbing device, recycling the mother liquor to the absorbing device, and continuing the recycling operation until the manganese sulfate in the mother liquor is >=200g/l, agitating and washing the obtained filter cake at 60-70°C, adjusting pH value of the clear solution obtained by pressure-filtering and separating to 2-4, adding manganese sulfide under agitation at 25-95 °C, and filtering and removing impurities, continuing agitating, pressure-filtering and separating, vaporizing the obtained clear filtrate, and obtaining manganese sulfate monohydrate after drying in the air stream. Desulfurizing efficiency is improved, the production cost of manganese sulfate is reduced, the recycling rate of total manganese is improved, and the valuable metals are recycled in high efficiency.
摘要:
L'invention se rapporte à un sulfate ferreux heptahydraté technique traité pour éliminer des traces d'eau intercristalline contenant de l'acide libre et ainsi le rendre susceptible d'écoulement libre. Le traitement consiste à le mélanger avec des phosphates calciques anhydres broyées finement, contenant au moins un atome de calcium pour un atome de phosphore. Au contact de l'acide sulfurique, il se forme à partir d'orthophosphates tri ou bicalciques, ou leur précurseur pyrophosphate et métaphosphate, des orthophosphates bi ou monocalci- ques, qui cristallisent avec de l'eau de substitution. A partir d'un sulfate ferreux brut, qui s'agglomère en masses, on obtient des produits parfaitement fluides contenant de 90 à 97 % de cristaux de sulfate de fer heptahydraté, et d'aspect très voisin du sulfate ferreux heptahydraté. On peut associer ce traitement à un traitement classique, tel que mélange avec un sulfate ferreux partiellement déshydraté et un neutralisant tel que carbonate de calcium. Par ailleurs le procédé est applicable à d'autres sulfates métalliques hydratés cristallisés, sulfate cuivrique, sulfates d'aluminium, de magnésium et de zinc.