Technique for producing cold-bonded pellets from steel converter dust removal ash

A technology for steel-making converter and cold-solidified pellets, which is applied in the field of steel-making converter dust removal and production of cold-solidified pellets, can solve the problems of secondary pollution, recycling, etc. Effect

Active Publication Date: 2014-09-17
CHONGQING ZHONGZHA METALLURGY RENEWABLE RESOURCESCO
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  • Abstract
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Problems solved by technology

The dust is a fine powder with a particle size of 35-200 mesh. If it cannot be recycled, it will cause secondary pollution during transportation and stacking.

Method used

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  • Technique for producing cold-bonded pellets from steel converter dust removal ash

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] see figure 1 Process flow chart of the present invention, steelmaking converter dedusting ash production cold solidification pellet process method, it is characterized in that:

[0034] 1. Collect steelmaking converter dust to obtain coarse dust and fine dust, or after sieving to obtain coarse dust and fine dust. The particle size of the coarse dust is between 80-150 mesh, and the fine dust is The particle size is between 150-320; in steelmaking converter production, coarse dust removal and fine dust removal are separated, and generally collected separately to obtain coarse dust removal and fine dust removal with different particle sizes; or through sieving

[0035] 2. Weigh the iron oxide scale, coarse dust and fine dust according to the mass ratio (10~50):(20~80):(20~70), and mix them evenly; you can use a 1600-type mixing m...

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Abstract

The invention discloses a technique for producing cold-bonded pellets from steel converter dust removal ash, which comprises the following steps: separately collecting rough dust removal ash and fine dust removal ash of the steel converter, weighing iron scale, rough dust removal ash and fine dust removal ash in a mass ratio of (10-50):(20-80):(20-70), and uniformly mixing; adding the mixture into a magnesium chloride solution, and uniformly mixing, wherein the magnesium chloride solution accounts for 1-20 wt% of the total mass; and pelletizing with a pelletizer, stripping, and naturally solidifying to obtain the cold-bonded pellets. The dust removal ash does not need previous digestion treatment with water, thereby saving abundant water resources; the production technique is simple and feasible, and is implemented only by proportionally adding the inorganic weakly-alkaline binder into the iron scale, rough dust removal ash and fine dust removal, uniformly mixing and pelletizing; by using the inorganic weakly-alkaline binder, the finished cold-bonded pellets have the advantages of fewer impurities, low SiO2 content and high total iron content (not lower than 60%); and abundant cold-bonded pellets can be used in the steelmaking process, and the steelmaking process is not influenced by the addition amount.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of dedusting ash produced in the converter smelting process, and in particular relates to a process method for producing cold-set pellets from the dedusting ash of a steelmaking converter. [0002] Background technique [0003] During the converter smelting process, 2% of the raw and auxiliary materials added to the furnace will be converted into dust, which is converter dust. The amount of converter dust generated is about 20kg / t steel. The dust is mainly composed of iron oxide, and the mass fraction of iron oxide is 70-95%. The remaining 5-30% of the dust consists of oxide impurities such as calcium oxide and other metal oxides (mainly zinc oxide). Other compounds in steelmaking dust are iron-zinc spinel, iron-magnesium spinel, calcium carbonate and carbon. Steelmaking dust contains high iron and few harmful impurities. If it is discarded, it will not only occupy a large area of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248
Inventor 帅林李恒瑞吴建飞
Owner CHONGQING ZHONGZHA METALLURGY RENEWABLE RESOURCESCO
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