A kind of method for ammonia extraction and modification of electrolytic manganese residue

Abstract

The invention relates to a method for extracting ammonium and modifying electrolytic manganese residue, and belongs to the field of environmental protection. The method comprises the steps: mixing the electrolytic manganese residue with one or more of quick lime, slake lime, carbide slag, steel slag, red mud or other alkaline slag, and heating and calcining the mixture under the condition of 200 to 500 DEG C. By adopting the method, the disadvantage that pollutants are formed in the heating process of the electrolytic manganese residue containing two volatile gases such as nitrogen and sulfur can be ingeniously avoided, the cementitious activity of the heated modified electrolytic manganese residue can be remarkably improved, and the modified electrolytic manganese residue can be used in cement factories, brick factories, concrete mixing plants and the like; more favorable advantages are as follows: the nitrogen element in the electrolytic manganese residue forms ammonia gas which is prepared into ammonia water to be recycled, and the sulfur element is cured in the residue in a form of calcium sulfate to be used as a beneficial cement excitant or retarder component. By adopting the process, the economical performance and environmental friendliness of an electrolytic manganese residue pretreatment method can be improved, an important significance for the recycling of the electrolytic manganese residue in China can be realized, the application prospect is wide, and the market value is vast.

Description

technical field [0001] The invention relates to a method for recycling electrolytic manganese slag resources. It belongs to the field of environmental protection. Background technique [0002] Electrolytic manganese is the second largest industry in the field of ferrous metallurgy in my country. In 2008, the production capacity of electrolytic manganese in my country reached 1.879 million tons, and the output reached 1.139 million tons, an increase of 19.6% and 11.2% respectively compared with 2007, accounting for 98.6% and 97.4% of the world respectively. According to the current grade of manganese carbonate ore, 6-10 tons of manganese slag are discharged for every ton of electrolytic metal manganese produced. The stock of manganese slag in my country has reached more than 50 million tons, and at the same time, more than 10 million tons of manganese slag are added every year. Manganese slag contains a variety of valuable components, and the realization of its "turning was...

AI Technical Summary

Problems solved by technology

When this method is calcined at 800°C and above, a large amount of sulfur dioxide gas will be produced, resulting in the need for gas desulfurization treatment of the flue gas, which greatly increases the preparation cost and is difficult to popularize.

A method of co-producing cement, sulfuric acid and gypsum using lead-zinc tailings and acid leaching electrolytic manganese slag as main raw materials (application number 200910044489.1) mentions that the produced SO2 gas is prepared into sulfuric acid and gypsum for recycling, but the flue gas is separated and extracted Medium sulfur dioxide gas is difficult and costly, and it is difficult to implement industrially