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Method for producing pellets by coal injection of grate-rotary kiln

A rotary kiln and pelletizing technology, applied in the field of chain grate-rotary kiln coal injection production of pellets, can solve the problem of easy nodulation in the rotary kiln, reduce the nodulation phenomenon, prolong the production cycle, and ensure normal production Effect

Active Publication Date: 2018-03-09
太原钢铁(集团)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the existing technology and solve the technical problem of easy nodulation in the rotary kiln during the process of grate machine-rotary kiln coal injection to produce pellets, the invention provides a chain grate-rotary kiln coal injection to produce pellets method of mine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the first embodiment, the finely ground coke powder is first added to the coal powder in proportion, and then sprayed into the rotary kiln to roast the pellets. The specific production steps are as follows:

[0019] (1) Fine grinding of coke powder: fine grinding of coke powder until the fineness is less than 0.044mm, the weight of coke powder accounts for 82.7% of the total weight of coke powder; the weight percentage of each component in the coke powder is: volatile 1.12% ash, 12.67% ash, 86.03% fixed carbon, 0.03% unavoidable impurities;

[0020] (2) Fine grinding of mixed pulverized coal: evenly mix bituminous coal and anthracite with a weight ratio of 2:3 and then finely grind until the fineness is less than 0.044mm. The weight of the mixed pulverized coal accounts for 78.5% of the total weight of the mixed pulverized coal; The weight percent of each component in the mixed pulverized coal is: volatile matter 20.47%, ash content 10.98%, fixed carbon 68.52%, unavo...

Embodiment 2

[0031] Compared with Embodiment 1, the present embodiment 2 further increases the proportion of finely ground coke powder, and then sprays the pellets into the rotary kiln for roasting. The specific steps are characterized as follows:

[0032] (1), coke powder fine grinding: coke powder is finely ground until the fineness is less than 0.044mm. The weight of coke powder accounts for 82.7% of the total weight of coke powder, and the composition of coke powder is the same as that of Example 1;

[0033] (2) Fine grinding of mixed pulverized coal: uniformly mix bituminous coal and anthracite with a weight ratio of 2:3 and then finely grind until the fineness is less than 0.044mm. The weight of mixed pulverized coal accounts for 78.5% of the total weight of mixed pulverized coal. The composition of mixed pulverized coal is with embodiment one;

[0034] (3) Ingredients mixing: uniformly mix the finely ground coke powder in step (1) and the finely ground mixed coal powder in step (2) ...

Embodiment 3

[0039] Compared with embodiment two, present embodiment three further increases the ratio of finely ground coke powder, and then sprays into rotary kiln pellets for roasting. The specific steps are characterized as follows:

[0040] (1), coke powder fine grinding: coke powder is finely ground until the fineness is less than 0.044mm. The weight of coke powder accounts for 82.7% of the total weight of coke powder, and the composition of coke powder is the same as that of Example 1;

[0041] (2) Fine grinding of mixed pulverized coal: uniformly mix bituminous coal and anthracite with a weight ratio of 2:3 and then finely grind until the fineness is less than 0.044mm. The weight of mixed pulverized coal accounts for 78.5% of the total weight of mixed pulverized coal. The composition of mixed pulverized coal is with embodiment one;

[0042] (3) Ingredients mixing: uniformly mix the finely ground coke powder in step (1) and the finely ground mixed coal powder in step (2) with a weig...

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Abstract

The invention relates to a method for producing pellets by coal injection of a grate-rotary kiln, and belongs to the technical field of production methods of iron ore powder pellets, which solves thetechnical problem of easiness in nodulating in the rotary kiln in the production process. By adopting the technical scheme, the method comprises the following steps of (1) performing fine grinding oncoke powder or dry quenching coke powder; (2) fine grinding of mixed coal powder: uniformly mixing bitumite and anthracite according to a weight ratio of 2:3, and performing fine grinding; (3) proportioning and mixing: uniformly mixing the coke powder or the dry quenching coke powder after fine grinding and the mixed coal powder after fine grinding; (4) injection and roasting: injecting the mixture obtained in step (3) into the rotary kiln to roast, wherein the pellet in the rotary kiln is the hematite powder pellet. The method has the advantage that the coke powder or the dry quenching coke powder after fine grinding is injected into the grate-rotary kiln according to a certain ratio so as to produce the raw pellet, so that the nodulating phenomenon in the grate-rotary kiln is reduced, the production cycle is extended, the normal production in the rotary kiln is guaranteed, and the guarantee is provided for the production of high-quality pellets.

Description

technical field [0001] The invention belongs to the technical field of iron ore powder pellet production methods, and in particular relates to a method for producing pellets by spraying coal into a chain grate-rotary kiln. Background technique [0002] Grate-rotary kiln is the main process for the production of iron ore powder pellets. The heat source is mainly natural gas, coke oven gas, heavy oil or coal powder. Most of the domestic grate-rotary kilns are built in mines. Far away from the city, natural gas fuel cannot be supplied, there is no local steel plant, coke oven coke gas cannot be supplied, and the cost of heavy oil is also high, so most of the chain grate-rotary kiln pellet production lines choose pulverized coal injection for pelletizing Production of pellets. However, after a period of production of pulverized coal injection, according to the temperature in the rotary kiln, nodules will appear in the rotary kiln after 30 days to 60 days of production, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24
CPCC22B1/02C22B1/2406
Inventor 臧龙范建军王磊唐璐娟
Owner 太原钢铁(集团)有限公司
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