Method for producing electrolytic manganese metal by using ammonia gas instead of aqueous ammonia to neutralize to remove iron

Abstract

The invention discloses a method for producing electrolytic manganese metal by using ammonia gas instead of aqueous ammonia to neutralize to remove iron, comprising working procedures of leaching chemical combination, purification, electrolysis, post treatment and the like. The working procedure of the leaching chemical combination comprises the steps of fully adding anolyte enabling material to react into a reactor, then adding sulphuric acid, adding manganese carbonate ore and manganese dioxide ore, introducing steam in the feeding process for heating, controlling the temperature at 70-75 DEG C and stirring for 2-2.5 hours in the leaching process, wherein the special point of the leaching process is that: introducing ammonia gas to the inside of feed liquid when fe2+ is less than or equal to 0.001g / l and stopping supplying air until the pH value of the feed liquid reaches 6.2-6.8. The ammonia gas replaces the aqueous ammonia for neutralizing operation, thereby eliminating plenty of industrial water brought by flushing the aqueous ammonia, not only saving water as well as time and work load for flushing the aqueous ammonia, but also effectively controlling water balance of the system and avoiding the problem of water expansion. An ammonia gas pipeline outlet is arranged at a position 2-4 meters under the level of the feed liquid, thereby avoiding the problem that the ammonia gas is overflowed to pollute the environment caused by flushing the aqueous ammonia and neutralizing by adopting the aqueous ammonia.

Description

technical field [0001] The invention belongs to the technical field of electrolytic manganese metal, and particularly relates to a method for producing electrolytic manganese metal by neutralizing and removing iron with ammonia gas in the compound leaching process. Background technique [0002] In the production process of electrolytic manganese metal, there are mainly the following methods at present. One is to use manganese oxide ore as raw material, roast and reduce it, and then undergo acid leaching and deep purification to prepare pure manganese salt solution for electrolytic production. Obtain high-purity electrolytic manganese metal; the other is to use manganese carbonate ore as raw material, then undergo acid leaching, oxidation and iron removal and deep purification to obtain pure manganese salt solution, which is used for electrolysis to obtain high-purity electrolytic manganese metal. Using manganese-containing waste as raw material, through acid leaching, oxidat...

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Problems solved by technology

[0009] In the process of compounding, ammonia water is generally used as neutralizer to remove iron, but the use of ammonia water to neutralize and remove iron has the following disadvantages: first, it increases the time for workers to prepare ammonia water and increases the workload; second, because our company's electrolytic manganese plant The equipment conditions of the ammonia water blending tank are limited, and the amount of ammonia water used is relatively large, so it is obvious that the continuity of the use of ammonia water cannot be completely guaranteed, and the turnover rate of the feed liquid will be affected by a certain program; If the acid control requirements are slightly higher, then a large amount of ammonia water is required for neutralization, which will cause ammonia expansion in the system and bring many unfavorable factors to production; fourth, when filling ammonia water, the industrial water brought in by neutralization in each tank is about 4 Tons, 3----5 cans are produced every day, and 12-20 tons of industrial water will be brought in, which will cause water imbalance in the system; fifth, when ammonia water is used for neutralization, the outlet of the ammonia water pipeline is not installed in the In the reaction feed liquid, ammonia water flows into the feed liquid during the addition process, and part of the ammonia gas will be discharged outside the plant through the fan, which has a certain degree of adverse effects on environmental protection