Method for making pellet by fine-grinded steel slag instead of bentonite

A technology of bentonite and pellets, which is applied in the field of waste utilization of converter steel slag, can solve the problems of decreased iron content in pellets, increased energy consumption of blast furnaces, and occupation of land, so as to reduce energy consumption of ironmaking and realize recycling , cheap effect

Inactive Publication Date: 2006-07-19
TANGSHAN GUOFENG IRON & STEEL
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Problems solved by technology

Converter slag generally contains Fe 2 o 3 15~25%, CaO45~50%, SiO 2 8 to 15% and a certain amount of MgO, S, P, etc., and the metal iron content in steel slag is calculated as 14%, so a large amount of metal in the piled steel slag has not been recovered, and the converter steel slag is discarded in the slag yard, which is not only a waste resources, but also occupy a large amount of land, and cause environmental pollution
Therefore, the comprehensive utilization of converter steel slag has been in...

Method used

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Embodiment Construction

[0012] The present invention is described in detail below in conjunction with embodiment.

[0013] The steps of the method for producing pellets by using finely ground steel slag instead of bentonite as described in this embodiment are as follows:

[0014] 1. Grinding: Finely grind converter steel slag to -200 mesh > 90% steel slag powder.

[0015] 2. Mixing: adding the steel slag powder meeting the above-mentioned condition 1 into the fine iron powder in an amount of 1 to 10% of the weight of the fine iron powder.

[0016] 3. Pelletizing: add water accounting for 6-10% of the total weight of the mixed raw materials consisting of iron concentrate powder and steel slag powder that meet the above 2 conditions, and make green balls with a particle size of 8-20mm by a pelletizing machine; Testing, green balls must have good anti-knock performance, high dry and wet ball compression and drop strength.

[0017] 4. Roasting: Send the raw balls that meet the above 3 conditions into a...

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Abstract

The method to use fine-grinding steel sludge instead of bentonite to prepare the pellet ore comprises: a. fine grinding the steel sludge into power with 200items content more than 90%; b. adding 1-10m% former steel sludge into refined iron powder instead of bentonite; c. adding 6-10% water into the mixture; generating 8-20mm raw roll; d. sending former balls into shaft furnace or chain-pellet for drying and baking. The experiments show the product has up to the standard, increases grade 2.2% and reduces SiO2 1.7%, and realizes sludge recovery.

Description

Technical field: [0001] The invention relates to waste utilization of converter steel slag, in particular to a method for producing pellets by using finely ground steel slag instead of bentonite. Background technique: [0002] At present, my country discharges more than 40 million tons of steel slag every year, accounting for 12.09% of solid waste in the iron and steel industry, and its comprehensive utilization rate is only 36%. It is mainly used as blast furnace flux and sinter raw materials, steel slag cement, bricks and blocks. Converter slag generally contains Fe 2 o 3 15~25%, CaO45~50%, SiO 2 8 to 15% and a certain amount of MgO, S, P, etc., and the metal iron content in steel slag is calculated as 14%, so a large amount of metal in the piled steel slag has not been recovered, and the converter steel slag is discarded in the slag yard, which is not only a waste It consumes resources, takes up a lot of land, and causes environmental pollution. Therefore, the compreh...

Claims

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Application Information

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IPC IPC(8): C22B1/14C22B1/243
Inventor 陈连旺于原浩
Owner TANGSHAN GUOFENG IRON & STEEL
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