Comprehensive recovery technology of solid waste gas ash and zinc-containing ferrovanadium slag

Abstract

The invention provides a comprehensive recovery technology of solid waste gas ash and zinc-containing ferrovanadium slag. By combining advantages of low iron content and rich carbon of gas ash and characteristics of high iron content and rich precious metals of ferrovanadium slag, and by the adoption of a rotary-kiln fire method fuming enrichment technology, the material undergoes comprehensive recovery. Advanced equipment such as a waste heat boiler, a negative-pressure bag collector, a pneumatic emulsification desulfurization tower and the like are configured to carry out efficient recovery and harmless environmental-protection processing of flue gas so as to achieve the purpose of clean production. By a beneficiation combined method, iron-containing kiln slag undergoes high added-value exploitation. Thus, the environmental protection problem of resource disposition is solved, and the effect of comprehensive utilization with low energy consumption, high yield and high added-value is achieved. Problems of short kiln age, high energy consumption and low concentration of SO2 during the treating process of ferrovanadium slag can be solved by the technology provided by the invention, and problems of poor iron separation effect and overhigh content of fluorine and chlorine in zinc hypoxide also can be solved. The technology has good economic benefit and high popularization and practical value.

Description

technical field [0001] The invention belongs to the field of secondary resource recycling in metallurgical processes, and relates to a process for comprehensively recovering valuable metals from low-grade zinc-containing solid waste residues by using a clean pyrotechnic enrichment technology, and performing harmless treatment, in particular to a A metallurgical method for comprehensively extracting nonferrous metals from gas mud (ash) and zinc-iron-vanadium slag. technical background [0002] my country is the world's largest iron and steel country, and its production capacity accounts for more than 60% of the world's total. The iron and steel industry produces a large amount of metallurgical smoke and dust every year, and most of the solid waste such as sintering dust, gravity ash, converter ash, iron oxide scale, water slag, and steel slag has been effectively recycled and utilized in iron and steel enterprises. Blast furnace ironmaking gas ash (Mud) has always been a maj...

AI Technical Summary

Problems solved by technology

Although this type of technology can also effectively extract valuable metals in the alumina slag, it consumes a large amount of fuel, and at the same time, due to the decomposition of sulfate in the slag, SO in the flue gas 2 The high concentration (about 1-3%) not only corrodes equipment and refractory materials, but also is difficult to recycle and treat, which affects the iron selection effect of kiln slag and easily causes kiln ring formation, resulting in high technology development costs

[0010] To sum up, the two types of patented technologies mentioned above are limited to professional development from the perspective of the characteristics of a single raw material, resulting in the failure to give full play to the value advantages of the two types of secondary resources, and the overall comprehensive utilization of resources is low. my country's metallurgical industry has limited efforts to promote energy conservation and emission reduction, the development of circular economy, and the establishment of a completely clean production development model

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