| 摘要 |
<p>Provided is a method for producing mercury-free alkaline-manganese type electrolyzed manganese dioxide, which sequentially comprises: (1) mixing manganese oxide ore and pyrite, continuously feeding the mixture and sulfuric acid into a continuous leaching tank to form a one-stage or multi-stage continuous leaching, removing potassium ions first after leaching, and then removing iron by means of a neutral iron removal method, and adding lime powder at the late stage of iron removal to adjust the pH value of the solution to 6-6.5, so as to obtain a manganese sulfate solution after reaction at 90-95°C for 3-4 hours; (2) performing purification and impurities removal on the manganese sulfate solution by a two-stage continuous purification process, and performing one-stage continuous purification on the manganese sulfate solution, where calcium polysulfide is added, and then performing a two-stage purification, where the solution passes through a sluice and calcium and magnesium are dynamically removed, and then the solution is sent to a still tank to stand to deposit and remove impurities such as calcium and magnesium; and (3) subjecting the purified manganese sulfate solution to ultra-fine filtering, heating to 90-100°C by a plate heat exchanger, and then entering an elevated tank, and at the same time, adding a prepared suspending agent and a prepared foaming agent, and supplying the resulting product to electrolysis baths through pipelines for electrolysis, so as to obtain mercury-free alkaline-manganese type electrolyzed manganese dioxide. The method has the advantages of wide adaptability to manganese oxide ores, short process flow, and low production cost.</p> |
