Method and system for recovering electrolytic manganese slag

Abstract

The invention discloses a method for recovering electrolytic manganese slag, which comprises the steps of manganese slag detoxification, waste slag utilization and waste gas recovery. The manganese slag detoxification process comprises the following steps: mixing manganese slag with sulfur and / or pyrite, drying, pulverizing, adding the powder into a fluidized bed, and heating to 920-1100 DEG C to perform high-temperature calcination. The system for recovering electrolytic manganese slag comprises a fluidized bed reactor, a gravity dust collector, a cyclone dust collector, a waste slag treatment device and a waste gas utilization device, wherein solid outlets of the fluidized bed reactor, gravity dust collector and cyclone dust collector are connected with the waste slag treatment device; a gas outlet of the fluidized bed reactor is communicated with the gravity dust collector; a gas outlet of the gravity dust collector is communicated with the cyclone dust collector; and a gas outlet of the cyclone dust collector is communicated with the waste gas utilization device. The high-temperature calcination is performed after the sulfur or pyrite is added to the manganese slag, and the reaction proceeds spontaneously after start, thereby saving abundant energies and avoiding secondary pollution.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and relates to a method for treating electrolytic chromium slag, in particular to a method and system for resource utilization of electrolytic manganese slag. Background technique [0002] With the increasing production of manganese, the problems brought about by electrolytic manganese slag are also becoming more and more serious. A large amount of manganese slag piled up not only puts a huge pressure on the environment, but also causes a waste of resources. Therefore, it is necessary to seek a process route for resource utilization of manganese slag. . [0003] At present, the utilization of manganese slag in my country is still in its infancy, and the technology needs to be mature. There are serious defects in the existing treatment methods: first, the existing method uses the electrolytic manganese slag fine powder clinker that has removed ammonia, nitrogen, sulfur, carbon, etc. The price ...

AI Technical Summary

Problems solved by technology

[0002] With the increasing production of manganese, the problems brought by electrolytic manganese slag are also becoming more and more serious. A large amount of manganese slag piled up not only puts a huge pressure on the environment, but also causes a waste of resources. Therefore, it is necessary to seek a process route for resource utilization of manganese slag

[0003] At present, the utilization of manganese slag in my country is still in its infancy, and the technology needs to be mature. There are serious defects in the existing treatment methods: first, the existing method will remove the electrolytic manganese slag fine powder clinker with 100 The price is about RMB / ton and sold to the cement plant as a retarder. Because the preparation of the retarder not only needs to consume a lot of coal, but also the cost of modified materials such as lime and soda ash is high, which eventually leads to the enterprise's income and lack of independent survival. Second, the organic matter such as ammonia, nitrogen, sulfur, carbon, etc. removed by electrolytic manganese slag is directly emptied through desorption treatment, which does not meet the national regulations on industrial solid pollution. In addition, heavy metal elements such as manganese, iron, chromium, and cadmium contained in electrolytic manganese slag still remain in the form of oxides in the fine powder material after roasting. If the material containing heavy metal is directly fired Building materials such as hollow bricks are prone to problems such as denitrification, deblocking and weathering, which seriously affect the subsequent resource utilization of materials

[0004] It can be seen that the existing manganese slag utilization technology has the defects of high cost, environmental pollution and substandard product quality. Therefore, it is necessary to develop a sustainable and low-cost resource utilization method for electrolytic manganese slag

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