Technology for comprehensively recycling leaching residue in production of electrolytic manganese metal and manganese dioxide

Abstract

The invention discloses a technology for comprehensively recycling a leaching residue in production of electrolytic manganese metal and manganese dioxide. The concrete technology comprises the following parts: recovery of manganese, ammonium sulfate, calcium sulfate and an ammonia gas, recovery of manganese-enriched ore, dihydrate gypsum, ferrum and sulfur cobalt nickel copper concentrate; crystal separation of ammonium sulfate, and preparation of composite fertilizer stock. By adopting the technology, a novel document technique is opened up for comprehensive recycling of the leaching residue produced in the process of producing electrolytic manganese metal and electrolytic manganese dioxide; not only can the ammonium sulfate, the ammonia gas, the ferromanganese ore concentrate, the sulfur cobalt nickel copper concentrate, the dihydrate gypsum, the quartz sand and the calcium sulfate be comprehensively recovered, but also associated products of the ammonia gas, the sulfuric acid, the manganese-enriched ore and the compound fertilizer stock can be prepared. Thus, comprehensive recycling of all components and zero emission are achieved.

Description

technical field [0001] The invention belongs to the technology of comprehensive utilization of waste slag, in particular to a method for comprehensive recycling and utilization of leached slag produced in the production process of electrolytic manganese and electrolytic manganese dioxide to achieve zero discharge. Background technique [0002] Most of the production enterprises of electrolytic manganese metal and manganese dioxide use manganese ore or pyrolusite as raw materials to produce metal manganese and electrolytic manganese dioxide through acid leaching. The process produces a large amount of leaching slag, which is generally in the form of black muddy paste. It dries to a green lump. At present, my country is the largest producer of electrolytic manganese in the world, accounting for 98.6% of the total global production. In 2012, my country's electrolytic manganese production capacity reached 450,000 tons, the actual output reached 1.7 million tons, and the amount ...

AI Technical Summary

Problems solved by technology

In 2012, my country's electrolytic manganese production capacity reached 450,000 tons, the actual output reached 1.7 million tons, and the amount of electrolytic manganese slag was nearly 10 million tons. In addition to the accumulated electrolytic manganese slag of more than 60 million tons over the years, the accumulation will consume a large area land, causing serious damage to the ecological environment

A large amount of heavy metal ions, toxic elements, and ammonium salts in the slag yard will infiltrate into groundwater, rivers, and soil with the erosion of rainwater, which will not only lose mineral resources, but also occupy a large amount of land

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