Processing and utilizing method for extracting carbon and iron from blast furnace metallurgy dust and sludge

A technology for metallurgical sludge and blast furnace, which is applied in chemical instruments and methods, wet separation, centrifuges with rotating drums, etc. Enhance selectivity, facilitate floc dispersion, and reduce the dosage of chemicals
CN103230831AInactive Publication Date: 2013-08-07NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Publication Date
2013-08-07
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A processing and utilizing method for extracting carbon and iron from blast furnace metallurgy dust and sludge belongs to the technical field of mineral processing. The method is characterized by including the steps that metallurgy dust and sludge containing polyacrylamide flocculant is processed, the metallurgy dust and sludge is graded through a hydrocyclone, coarse fraction products are ground and returned to grading operation, fine fraction products are subjected to once roughing and once fine selection through a horizontal centrifugal separator, and iron ore concentrate for metallurgy is obtained through filtering and dehydration operation. Ore pulp of tailing products of the horizontal centrifugal separator is processed through ultrasonic wave and dispersed by adding sodium hexametaphosphate, selective flocculant caustic starch is added, carbon is selected in a floatation mode under the effect of diesel and an n-amyl alcohol compound collecting agent, and carbon concentrate can be obtained through operation of once roughing, twice fine selection and once scavenging. The tailing products selected in the floatation mode are used as the final tailing products. The processing method for utilizing secondary resources of the blast furnace metallurgy dust and sludge containing the flocculant efficiently is provided and has important practical significance on cleaner production, recycling economy and energy saving and emission reduction in iron and steel industry.
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Description

technical field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for processing and utilizing carbon and iron extracted from blast furnace metallurgical dust. Background technique

[0002] Metallurgical dust sludge is a by-product discharged during the blast furnace production process, mainly including blast furnace gas sludge, converter dust sludge and dust removal ash. In the past, it was generally used to return to the sintering plant, and it was recycled in the iron and steel enterprise as an ingredient of sintering ore. However, the particle size of these dust and mud is very fine, much smaller than that of iron ore concentrate powder. When mixed into the sintering material, it will affect the air permeability of the sintering material layer, thereby affecting the efficiency of the sintering process. At the same time, metal Zn, Pb and other volatile elements in the dust sludge are enriched in the blast fur...

Claims

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