A method for producing low-silicon flux pellets with a large-scale belt roaster

A belt-type roaster and flux-based technology, which is applied in the fields of iron and steel smelting and pellet production, to achieve the effects of reducing slag ratio, improving furnace grade, and excellent comprehensive performance

Active Publication Date: 2021-03-19
SHOUGANG JINGTANG IRON & STEEL CO LTD
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Problems solved by technology

However, the industrial research on the production of flux pellets by large-scale belt roasters is still blank in China

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  • A method for producing low-silicon flux pellets with a large-scale belt roaster

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Embodiment Construction

[0024] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] The prepared raw materials (including iron concentrate powder, calcium-containing flux, and binder) are compounded, wetted, pelletized, roasted, and classified to obtain finished low-silicon flux pellets. Specific steps are as follows:

[0026] a. Raw material preparation: iron concentrate powder (TFe 69.65%, SiO 2 1.76%, particle size-200 mesh 83.30%), slaked lime powder (CaO 64.73%, particle size-200 mesh 91.26%), bentonite (SO 2 51.23%, blue absorption 31.27%, expansion multiple 19.61, water absorption 467.85);

[0027] b. Compounding: Mix 96.4% of iron concentrate powder, 3.5% of slaked lime powder, and 0.4% of bentonite in proportion, and mix them evenly in a powerful mixer with a mixing efficiency >98%;

[0028] c. Wetting: add ...

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Abstract

The invention discloses a method for producing low-silicon fluxed pellets by a large belt-type roasting machine. A large belt-type roasting machine technology is utilized to produce the low-silicon fluxed pellets. The method comprises the steps of raw material mixing, wetting, pelletizing, roasting, cooling and finished product grading. Specifically, iron concentrate powder, a binder and a calcium-containing flux are sequentially subjected to raw material mixing, wetting, pelletizing, roasting and finished product grading and thus the low-silicon fluxed pellets are obtained. The pellets produced through the method comprise 2.0-2.5% of SiO2, and 1.0-1.2% of CaO / SiO2, and the compressive strength of each pellet is greater than or equal to 2500 N. The low-silicon fluxed pellets produced through the method are high in compression resistance and excellent in metallurgical property, can be used as the quality raw materials for blast furnaces, and the basis is provided for the blast furnacesto increase the pellet adding proportion, improve the in-furnace grade and decrease the slag ratio.

Description

technical field [0001] The invention relates to a method for producing low-silicon flux pellets by a large-scale belt roaster, which belongs to the technical field of iron and steel smelting, in particular to the technical field of pellet production. Background technique [0002] Since the 1970s, countries such as Europe, North America, and Japan have begun to produce flux-based pellets, and have been popularized and applied in blast furnace smelting, and some blast furnaces have achieved full-flux pellet smelting. [0003] In recent years, with the continuous increase in the demand for blast furnace smelting concentrates and the increasing demand for energy conservation and emission reduction in steel production in my country, the production of pellets has grown by leaps and bounds, but the pellets are basically acidic pellets. The blast furnace raw material feeding structure is basically high-basic sinter and acid pellets. In order to balance the acid-base balance of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/2406C22B1/243
Inventor 刘文旺黄文斌李明王晓朋安钢青格勒吴小江魏红旗霍吉祥董相娟孙宝家
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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