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Vertical furnace for coal base direct reduction and method for melting using same

A direct, shaft furnace technology, applied in the direction of shaft furnaces, furnaces, furnace types, etc., can solve the problems of low furnace utilization coefficient and high power consumption, and achieve the effect of high furnace utilization coefficient, large equipment production capacity, and reduced power consumption

Pending Publication Date: 2017-11-17
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional coal-based direct reduction equipment mainly includes rotary kiln, tunnel kiln, etc. The biggest feature is that the main body of the equipment is moving, and the materials and equipment move together, the furnace utilization factor is low, and the power consumption is high.

Method used

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  • Vertical furnace for coal base direct reduction and method for melting using same

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Effect test

Embodiment 1

[0020] Set up a coal-based reduction shaft furnace for the annual processing of 300,000 tons of iron ore concentrate, using blast furnace gas as the fuel gas, mixing iron ore concentrate, blue carbon and limestone at a mass ratio of 100:15:10 to make carbon-containing pellets, and placing them in In the shaft furnace, adjust the gas flow to 22000-25000Nm 3 / h, air flow 70000~80000Nm 3 / h and the temperature in the furnace is 850°C to reduce the carbon in the pellets to metal oxides to produce metallized pellets.

Embodiment 2

[0022] Set up a coal-based reduction shaft furnace for the annual processing of 500,000 tons of laterite nickel ore, using coke oven gas as fuel, mixing laterite nickel ore, anthracite and dolomite into carbon-containing pellets at a mass ratio of 100:10:5, and then Place it in the shaft furnace and adjust the gas flow to 5000-6000Nm 3 / h, air flow 32000~40000Nm 3 / h and the temperature in the furnace is 800°C to reduce the carbon in the pellets to metal oxides to produce metallized pellets.

Embodiment 3

[0024] Set up a coal-based reduction shaft furnace for processing 800,000 tons of chromite ore per year, using natural gas as fuel gas, mixing chromite, blue carbon, limestone, and silica into carbon-containing pellets at a mass ratio of 100:20:10, and then Put it in the shaft furnace, adjust the natural gas 8000~9000Nm 3 / h, air flow 60000~70000Nm 3 / h and the temperature in the furnace is 1200°C to reduce the carbon in the pellets to metal oxides to produce metallized pellets.

[0025] Wherein, the vanadium-titanium sea sand in this embodiment can be replaced by vanadium-titanium magnetite or vanadium-titanium sea sand ore.

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Abstract

The invention discloses a vertical furnace for coal base direct reduction and a method for melting using the same. The vertical furnace comprises a furnace body, a feeding port arranged on the upper end of the furnace body and discharging ports arranged on the lower end of the furnace body, a distributor is arranged in the part, on the end close to the feeding port, of the furnace body, combustion chambers are arranged on the side walls of the furnace body, and a gas inlet and an air inlet are formed in each combustion chamber separately. The method for melting using the same comprises the following steps: mixing ore, a reducing agent and a solvent according to the mass ratio of 100 to 5-20 to 5-15 to prepare carbon-containing pellets; and placing the carbon-containing pellets in the vertical furnace, and adjusting coal gas, air flow and temperature in furnace so that carbon in the pellets can reduce metal oxides before obtaining metalized pellets. The vertical furnace has the advantages that the furnace is a static device, so that a driving device is not needed, electricity consumption is greatly reduced, and meanwhile, materials are fully distributed in the furnace, the utilization coefficient of the furnace is high, and the equipment productivity is large.

Description

technical field [0001] The invention belongs to the field of non-blast furnace ironmaking, in particular to a coal-based direct reduction shaft furnace and a smelting method using the shaft furnace. Background technique [0002] Metallized pellets are iron ore that is directly reduced to metallic iron under solid conditions. Since the metallized pellets have not been smelted, they form a microporous structure during the deoxidation process, which looks like a sponge, so it is also called sponge iron. Sponge iron can replace scrap steel as raw material for electric furnace, and can also be used as raw material for other smelting reduction. [0003] According to the main energy source, direct reduction can be divided into coal-based direct reduction, gas-based direct reduction and electric thermal direct reduction. Traditional coal-based direct reduction equipment mainly includes rotary kiln, tunnel kiln, etc. The biggest feature is that the main body of the equipment is movi...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/006C21B13/008
Inventor 尹鑫平裴培赵吉诗季爱兵雷华
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST