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Method for producing silicon iron smelting carbonaceous reducing agent by using industrial waste residues

A technology of industrial waste slag and reducing agent, which is applied in the field of ferrosilicon smelting, can solve the problems of high cost and unutilization, and achieve the effects of qualified products, resource saving and remarkable economic benefits

Inactive Publication Date: 2013-09-04
宁夏兴平精细化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When ferrosilicon is smelted, the requirements for carbonaceous reducing agent are very special. It is necessary to use coke or semi-coke with particle size of 1-1.5cm, fixed carbon content greater than 82-84%, and ash content less than 14% as carbonaceous reducing agent. The disadvantage of the method is that the cost is too high, the market price is 1,000 yuan / ton, and coke, semi-coke, and calcined coal powder become industrial waste residues that cannot be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 30% of semi-coke powder (with a particle size below 1mm), 30% of calcined coal powder (with a particle size below 1mm), 30% of coke powder (with a particle size below 1mm), and 10% of pieces of medium-temperature coal tar pitch, according to the above Mix and mix evenly in a quantitative ratio, add it to a constant temperature stirring pot at 200°C and stir for 15 minutes, open the outlet of the stirring pot, feed the mixture into the inlet of the extrusion molding machine, and turn on the extrusion molding machine to extrude the mixture into a diameter Irregular pellets of 1cm to 1.5cm can become carbonaceous reducing agents for ferrosilicon smelting after natural cooling. After laboratory testing, the main content indicators of the pellets are 83% fixed carbon, 8% ash, and 8% volatile matter. The reducing agent is mixed with silica and steel shavings in a certain proportion, and can be put into the furnace to smelt ferrosilicon to meet the needs of ferrosilicon sm...

Embodiment 2

[0014] Take 28% semi-coke powder (with a particle size below 1mm), 29% calcined coal powder (with a particle size below 1mm), 29% coke powder (with a particle size below 1mm), and 14% medium-temperature coal tar pitch in pieces, according to the above Mix and mix evenly in a quantitative ratio, add it to a constant temperature stirring pot at 200°C and stir for 15 minutes, open the outlet of the stirring pot, feed the mixture into the inlet of the extrusion molding machine, and turn on the extrusion molding machine to extrude the mixture into a diameter Irregular pellets of 1cm to 1.5cm can become carbonaceous reducing agents for ferrosilicon smelting after natural cooling. The reducing agent is mixed with silica and steel shavings in a certain proportion, and can be put into the furnace to smelt ferrosilicon, and the carbonaceous reducing agent required for ferrosilicon smelting can participate in the smelting reaction.

Embodiment 3

[0016] Take 29% of semi-coke powder (with a particle size below 1mm), 28% of calcined coal powder (with a particle size below 1mm), 30% of coke powder (with a particle size below 1mm), and 13% of fragmented medium-temperature coal tar pitch, according to the above Mix and mix evenly in a quantitative ratio, add it to a constant temperature stirring pot at 200°C and stir for 15 minutes, open the outlet of the stirring pot, feed the mixture into the inlet of the extrusion molding machine, and turn on the extrusion molding machine to extrude the mixture into a diameter Irregular pellets of 1cm to 1.5cm can become carbonaceous reducing agents for ferrosilicon smelting after natural cooling. The reducing agent is mixed with silica and steel shavings in a certain proportion, and can be put into the furnace to smelt ferrosilicon, and the carbonaceous reducing agent required for ferrosilicon smelting can participate in the smelting reaction.

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Abstract

The invention relates to a method for producing silicon iron smelting carbonaceous reducing agent by using industrial waste residues. The method is characterized in that blue carbon powder, calcined coal powder, coke powder and medium temperature coal pitch are uniformly mixed according to the weight ratio of 28 to 30 percent : 28 to 30 percent : 28 to 30 percent : 10 to 16 percent; then stirring is performed for 10 to 15 min in a constant temperature condition at the temperature of 200 to 220 DEG C; finally extrusion forming is performed; and carbonaceous reducing agent is obtained after natural cooling. The method adopts industrial waste residues including the blue carbon powder, the calcined coal powder, the coke powder and the medium temperature coal pitch to produce the silicon iron smelting carbonaceous reducing agent, and the carbonaceous reducing agent can also be involved in smelting reaction, so that the industrial waste residue including blue carbon powder, calcined coal powder, the coke powder and the like can be sufficiently utilized during silicon iron smelting in conditions of low cost and low technical requirements, and the purposes of waste resource recycling, cost reducing, resource saving and environment protection are achieved. The pellet carbonaceous reducing agent manufactured according to the ratio of the method can be directly applied to silicon iron smelting, and totally meets smelting principle and actual operation, and the cost of the carbonaceous reducing agent is one half of that of coke or blue carbon, so that the economic benefit is obvious.

Description

technical field [0001] The invention relates to the technical field of ferrosilicon smelting, in particular to a method for producing a carbonaceous reducing agent for ferrosilicon smelting by using industrial waste slag. Background technique [0002] When ferrosilicon is smelted, the requirements for carbonaceous reducing agent are very special. It is necessary to use coke or semi-coke with particle size of 1-1.5cm, fixed carbon content greater than 82-84%, and ash content less than 14% as carbonaceous reducing agent. The disadvantage of the method is that the cost is too high, the market price is 1000 yuan / ton, and coke, semi-coke, and calcined coal powder become industrial waste residues that cannot be utilized. Contents of the invention [0003] The object of the present invention is to overcome the defects in the above-mentioned prior art, and provide a method for producing carbonaceous reductant for ferrosilicon smelting by using industrial waste slag to replace coke...

Claims

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Application Information

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IPC IPC(8): C01B31/02C22B5/10C01B32/05
Inventor 高飞
Owner 宁夏兴平精细化工股份有限公司
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