Production of pre-reduced chrome ore pellet by external heated shaft furnace

An externally heated shaft furnace technology, applied in the field of shaft furnaces, can solve problems such as complex process technology, huge equipment, and difficult operation, and achieve the effects of easy operation, high labor productivity, and reduced CO gas emissions

Inactive Publication Date: 2009-04-29
李志忠
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the rotary kiln method has the problems and shortcomings of huge equipment, complicated process technology, and very difficult operation.

Method used

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  • Production of pre-reduced chrome ore pellet by external heated shaft furnace
  • Production of pre-reduced chrome ore pellet by external heated shaft furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The chromium ore pre-reduction shaft furnace and electric furnace smelting production process are as follows:

[0029]

[0030] 1. Ball pressing process: chrome ore powder (<5mm), metallurgical coke powder (<3mm), bentonite (<80 mesh), added to the mixer according to the ratio of 100:15-20:4-5, and then dry mixed and wet After mixing, it is added to the counter-rolling ball machine, and the particle size of the cold-pressed ball is <30mm. It can be dried at 200-300℃ and then loaded into the shaft furnace by the elevator, or directly into the shaft furnace without drying.

[0031] 2. Shaft furnace pre-reduction process: Shaft furnace is divided into preheating section, reduction section and cooling section. The shaft furnace consists of several reduction reaction chambers with independent systems. The dried chromium ore pellets are loaded into the silo on the top of the shaft furnace. The charge first enters the preheating section, the upper part of the preheating section ...

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Abstract

The invention discloses a chrome ore prereduction external heating type shaft furnace, which is characterized in that multilayer gas burner flame paths arranged on both sides of reduction reaction chambers with a rectangular cross section indirectly supply heat under the condition of air separation. The shaft furnace consists of a plurality of independently working reaction reduction chambers; the reduction reaction chambers and the gas burner flame paths are built by tailored high aluminium special-form refractory bricks; and the shaft furnace body is vertically arranged on a bearing girder. Dried carbon-contained chrome ore pellets are added into a bin on the top end of the shaft furnace and are discharged out of the furnace through the preheating section, the reduction section and the cooling section of the shaft furnace. The temperature of the reduction reaction is 1,300 to 1,400 DEG C; the material stays at the reduction section for 3 to 4 hours; and the comprehensive reduction degree is 60 to 70 percent. The prereduced pellet ore is used for producing high carbon ferrochrome in a closed electric furnace. The cold pellet ore which is charged into the closed electric furnace can reduce the power consumption for ferrochrome by above 25 percent, improve the yield by above 40 percent, reduce the emission by above 20 percent, and improve the chrome recovery rate by above 3 percent. The chrome ore prereduction external heating type shaft furnace can be used for continuous production, and has the advantages of circulation, high economical efficiency, environmental protection, energy conservation, emission reduction, and the like.

Description

(1) Technical field [0001] The invention relates to a shaft furnace, in particular to an externally heated shaft furnace used for pre-reduction of chrome ore. (2) Background technology [0002] The technical scheme of the present invention is to use internationally cheap powdered chromium ore to produce a pre-reduced chromium ore pellet with a reduction degree of chromium and iron of 60-70%, which is used to produce high-carbon ferrochromium products to achieve large The purpose of saving electric energy, reducing emissions, increasing output and reducing costs. [0003] At present, domestic pre-reduction of chromium ore pellets has done a lot of experimental research work. Due to the complex technology, it has not been able to move towards industrial production. Foreign countries such as Japan have successfully developed the pre-reduction process of chromium ore pellets with the rotary kiln method, which is called the SRC method. And built a 18000KVA closed ferrochrome electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/12C22B34/32F27B1/02
Inventor 李志忠
Owner 李志忠
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