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Raw material heating and pre-reduction technology in production process of iron alloy

A production process and ferroalloy technology, which is applied in the field of raw material heating pre-reduction process in the ferroalloy production process, can solve the problems of large floor area, large heat loss of reducing agent, excessive height and load of submerged arc furnace workshop, etc.

Inactive Publication Date: 2015-05-13
乌兰察布市旭峰新创实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hot charging process has the following defects: the production line is too long, resulting in a large footprint, and a large investment in construction and equipment.
The process is as follows: the ore and coke powder are pelletized and sintered after being ground, heated and reduced in the preheating tank, and after the reduction reaction reaches the specified standard, the hot material is mixed with carbon into the furnace again, and after being mixed with carbon into the furnace again, it is not fully stirred , the situation in the furnace is not easy to control, the charcoal is easy to burn at high temperature, and the heat loss is relatively large when adding a reducing agent. When the roof is lifted, the height and load of the submerged arc furnace workshop are too large, and the architectural design is very difficult. The construction investment is still very large, and the safety cannot be guaranteed under the condition of long-term high-temperature continuous operation.
Each preheating tank is equipped with several distributing pipes. Once a distributing pipe is not feeding smoothly, it is difficult to solve the problem in time.
Furthermore, the actual feeding amount of each material tube is not easy to monitor, the preheating tank and slide tube will affect the welding of the electrode cylinder and the addition of electrode paste, and it will also cause the working area of ​​the furnace top electrode paste platform to be narrow and the working environment is poor

Method used

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  • Raw material heating and pre-reduction technology in production process of iron alloy

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Comparison scheme
Effect test

Embodiment 1

[0023] A raw material heating pre-reduction process in the production process of ferromanganese alloy comprises the following steps:

[0024] a. Mix various ores and reducing agents according to the conventional size of 5-50 mm;

[0025] b. Enter the material particles into the batching bin on the upper part of the submerged arc furnace through the lifting mechanism;

[0026] c. Send the material into the sealed preheating tank of the monomer through the mobile batching mechanism in the batching bin, and the shape of the monomer preheating tank is ring-shaped in the preheating bin;

[0027] d. The material entering the preheating tank is heated to 1300-1350°C by the high-temperature flame gas penetrating the uniformly distributed material, and the partial reduction reaction reaction ratio is 32-36%. The high-temperature flame gas is fully sealed by the lower part Produced by the combustion of coal gas produced in the reduction reaction of the submerged arc furnace,

[0028] ...

Embodiment 2

[0031] A raw material heating pre-reduction process in the ferrochromium alloy production process, which comprises the following steps:

[0032] a. Mix various ores and reducing agents according to the conventional size of 5-50 mm;

[0033] b. Enter the material particles into the batching bin on the upper part of the submerged arc furnace through the lifting mechanism;

[0034] c. Through the mobile batching mechanism in the batching bin, the materials are continuously fed into 24 sealed preheating tanks, and the 24 preheating tanks are evenly arranged in a ring shape in the batching bin;

[0035] d. The material entering the preheating tank is heated to about 1400°C by the high-temperature flame gas penetrating the uniformly distributed material, and the partial reduction reaction reaction ratio is about 35%. It is generated by the combustion of gas generated in the reduction reaction of the furnace, and the material is guaranteed to be in a reducing atmosphere during the pro...

Embodiment 3

[0039] A raw material heating pre-reduction process in the production process of high-carbon ferromanganese alloy, which comprises the following steps:

[0040] a. Mix various ores and reducing agents according to the conventional size of 25-40 mm;

[0041] b. Enter the material particles into the batching bin on the upper part of the submerged arc furnace through the lifting mechanism;

[0042] c. Through the mobile batching mechanism in the batching bin, the materials are continuously fed into 20 sealed preheating tanks, and the 20 preheating tanks are evenly arranged in a ring shape in the batching bin;

[0043] d. The material entering the preheating tank is heated to 1400-1500°C by the high-temperature flame gas penetrating the evenly distributed material, and the partial reduction reaction reaction ratio is 50-55%. The high-temperature flame gas is fully sealed by the lower part It is generated by the combustion of gas generated in the reduction reaction of the submerge...

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Abstract

The invention discloses a raw material heating and pre-reduction technology in the production process of iron alloy. The raw material heating and pre-reduction technology comprises the steps as follows: a, fine grinding, pelletizing and drying are performed after materials are mixed; b, material particles are lifted to enter a proportioning bin at the upper part of a submerged arc furnace; c, the material particles are respectively and continuously conveyed into a plurality of sealed preheating tanks through a movable proportioning mechanism in the proportioning bin; d, the material particles are heated to 800-1,100 DEG C by high-temperature gas flame under an oxygen-free environment; e, the material particles are smelted after entering the submerged arc furnace; f, the iron alloy is obtained intermittently. According to the invention, the process sequences of the step d and the step b are adjusted, the step c is increased, and a single static preheating tank is creatively modified into an annular dynamic multi-preheating-tank form, so that the submerged arc furnace workshop height is reduced, the centre of gravity is reduced, the one-time construction investment is lowered, the safety is further improved greatly, the consistency of the physico-chemical state of the uniformly mixed materials is ensured, and stability in the reduction reaction, product reliability and low cost in operation are achieved.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy reduction technology, in particular to a raw material heating pre-reduction technology in the ferroalloy production process. Background technique [0002] The submerged arc furnace method is currently a conventional method for the production of ferroalloys. It is mainly used for reducing smelting ores, carbonaceous reducing agents and solvents and other raw materials. . Alternative materials include charcoal, petroleum coke, pitch coke, gas coke, metallurgical coke, bituminous coal and anthracite. However, considering the physical and chemical properties and actual production, the carbonaceous reducing agent used in the submerged arc furnace method is mainly metallurgical coke. Although Japan, Norway, Germany, the United States and the former Soviet Union have added bituminous coal, wood chips, anthracite and semi-coke in different proportions in addition to metallurgical coke to improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06C22C33/00C22C38/04
Inventor 李书成李伟锋
Owner 乌兰察布市旭峰新创实业有限公司