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Preparation method of non-sintered carbon-bearing iron pellets

A sintering-free, iron ball technology, applied in the field of carbon and iron raw materials for smelting, can solve the problems of large blast furnace gas consumption, long process flow, air pollution by smoke and dust, etc.

Inactive Publication Date: 2011-05-11
SHANDONG CHUANGXIN HUMIC ACID TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of process is long, and a large amount of smoke and dust will be generated during the sintering process to pollute the air. About 20% of the returned materials will be repeatedly sintered. During the sintering process, a large amount of blast furnace gas, coke powder and electricity will be consumed. About 12% of energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: Input 50 kg of anthracite powder, 30 kg of blue coke powder, and 20 kg of coke powder with a particle size below 2mm into the mixer, and at the same time, add 870 kg of steel slag powder with an iron content of 60% and 40 kg of binder into the mixer for mixing and stirring , A small amount of water is properly added during the stirring process, and the wet adhesion shall prevail. After stirring evenly, put the mixed material into the double-roll molding machine, extrude into pellets, then stack and arrange the formed carbon-iron pellets for curing, cover the outside with plastic cloth, and keep the temperature at 35-50°C. After stacking for 24 hours, remove the plastic cloth and dry it in the air, or dry it with a dryer at a temperature of 100-400°C until the water content is less than 4%. Finally, the iron content is 52%, 1,000 kg of carbon-iron pellets with sulfur and phosphorus content meeting the smelting requirements can be used as smelting raw materials...

example 2

[0008] Example 2: Input 170 kg of anthracite powder and 30 kg of semi-coal powder with a particle size below 2mm into the mixer, and at the same time, add 760 kg of steel slag powder with an iron content of 55% and 30 kg of binder into the mixer for stirring, and add an appropriate amount of water. Wet, add the mixed material into the roller forming machine and extrude into pellets, then stack and arrange the formed pellets, cover with plastic cloth, keep the temperature at 20-35°C, cover for 30 hours for full curing, and then uncover Remove the plastic cloth for drying, or add it to the dryer for drying, reduce the moisture in the pellets to less than 4%, and form 1,000 kg of carbon-iron pellets with an iron content of 41.8% that meet the smelting requirements, which can be used as smelting raw materials Add it directly to the iron-smelting furnace to smelt iron.

example 3

[0009] Example 3: Add 50 kg of coke powder with particle size below 2 mm, 930 kg of steel slag powder with 50% iron content and 20 kg of binder into the mixer for stirring, adding appropriate amount of water for wetting. Put the mixed material into the double-roll molding machine, extrude into pellets, then arrange and stack the pellets, cover them with plastic cloth, keep the temperature at 30-40°C, and cure for 26 hours , remove the plastic cloth and dry it in the air, or put it in a dryer for drying until the moisture content in the pellets drops below 4%, and finally form 1,000 kg of carbon-iron pellets with an iron content of 46.5%, which can be directly used as smelting raw materials Add it to the iron furnace to smelt molten iron.

[0010] The binder in the above-mentioned examples is made by mixing 80-90% of the patented dry powder briquette binder (Patent No. ZL200610045496X) of the main inventor of the present invention with 10-20% of sodium silicate. It is selected...

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Abstract

The invention relates to a preparation method of non-sintered carbon-bearing iron pellets, comprising the following steps: mixing pulverized combustion media and steel slag powder, then adding adhesive in proportion, wherein the components in proportion are as follows: 5-20% of combustion media, 76-93% of steel slag powder and 2-4% of adhesive; adding a proper amount of water and stirring evenly, adding into a double roller type forming machine for extrusion forming, then stacking, curing and drying until the moisture content of the cured pellets is smaller than 4% to obtain the non-sintered carbon-bearing iron pellets. The combustion media comprise anthracite duff, blue carbon powder and coke powder; the steel slag powder is iron-containing slag formed by crushing, grinding and magnetically separating steelmaking slag, and the iron content of the steel slag powder is greater than or equal to 50%; the adhesive is compounded from dry powdered coal adhesive and sodium silicate in proportion of 80-90%:10-20%; and the curing temperature is 20-60 DEG C, the stacking time is 10-30 hours, and the drying temperature is 100-400 DEG C. The invention can save energy consumption, reduce pollution, reduce cost and improve efficiency.

Description

technical field [0001] The invention relates to carbon iron raw materials for smelting, in particular to the production of carbon iron pellets. Background technique [0002] Blast furnace ironmaking technology has become more and more mature in the history of nearly a hundred years. At the same time of large-scale development, it has brought problems such as long process flow, large investment, and serious pollution. Coking coal is a scarce coal, and the coking process will also increase consumption. and pollution. At present, the carbon-iron pellets used in domestic pig iron smelting are generally firstly mixed with iron concentrate powder plus bentonite or binder and 4-6% coke powder to make pellets, and then passed through a shaft furnace or sintered Machine sintering to make pellets or agglomerates, which are then crushed after cooling, and put into the ironmaking furnace together with coke to be smelted into molten iron. Steel slag powder is used as an auxiliary mater...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/248
Inventor 孙明广曾宪成田厚宇孙明亮翟桂元杜茂福乔英云
Owner SHANDONG CHUANGXIN HUMIC ACID TECH
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