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

A technology for metallurgical sludge and blast furnace, applied in chemical instruments and methods, wet separation, centrifuges with rotating drums, etc. Conducive to floc dispersing, enhancing selectivity and reducing the effect of overgrinding

Inactive Publication Date: 2015-06-03
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN201210248833 also discloses a method for recovering valuable elements from blast furnace gas mud, using a floating magnetic process, but in the process, there is no flocculant in the gas mud raw material itself or the influence of the flocculant on the process is not considered

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

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Embodiment 1

[0018] Main raw materials: metallurgical dust; caustic starch; diesel oil; n-amyl alcohol; sodium hexametaphosphate

[0019] The total iron grade of the metallurgical dust sludge used is 25.00%, SiO 2 14.00%, fixed carbon content is 26.45%, SO 3 is 4.21%, CaO is 5.80%, ZnO is 5.74%, and Cl is 0.78%. Iron minerals mainly exist in the form of hematite, magnetite and elemental iron, and metallurgical dust contains a large amount of polyacrylamide.

[0020] The metallurgical dust is coarsely and subdivided by the hydrocyclone, and the classification particle size is 0.105mm. The coarse-grained products are ground by a rod mill and then returned to the classification operation. The fineness of the classified products is -200 mesh, accounting for 95%.

[0021] The graded fine-grained products go through a horizontal centrifugal concentrator for one roughing and one beneficiation, and the sorted concentrate products are filtered and dehydrated to obtain iron concentrates for smeltin...

Embodiment 2

[0025] Main raw materials: metallurgical dust; caustic starch; diesel oil; n-amyl alcohol; sodium hexametaphosphate

[0026] The total iron grade of metallurgical dust sludge used is 23.65%, SiO 2 13.59%, fixed carbon content is 27.55%, SO 3 is 3.89%, CaO is 5.62%, ZnO is 4.67%, and Cl is 0.52%. Iron minerals mainly exist in the form of hematite and magnetite, and metallurgical dust contains a large amount of polyacrylamide.

[0027] The metallurgical dust is coarsely and subdivided by the hydrocyclone, and the classification granularity is 0.105mm. The coarse-grained products are ground by a rod mill and then returned to the classification operation. The fineness of the classified products is -200 mesh, accounting for 98%.

[0028] The graded fine-grained products go through a horizontal centrifugal concentrator for one roughing and one beneficiation, and the sorted concentrate products are filtered and dehydrated to obtain iron concentrates for smelting. The operating cond...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B03D1/00B03B1/00B03B5/34B04B1/00B03D1/008B03D101/02
Inventor 张晋霞牛福生聂轶苗白丽梅刘淑贤梁银英
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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