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A kind of method adopting lignin as reducing agent to produce direct reduced iron

A technology for lignin and reduced iron, applied in fluidized bed furnaces, furnaces, furnace types, etc., can solve the problems of unutilized lignin, complicated production process, increase production cost, etc., and achieve the effect of increasing fixed carbon content

Inactive Publication Date: 2021-08-10
NORTHEASTERN UNIV LIAONING +2
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  • Description
  • Claims
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Problems solved by technology

However, this method does not give full play to the value of lignin as a reducing agent, and it needs to be pretreated during the process of utilizing lignin, which will inevitably increase the production cost and complicate the production process

Method used

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  • A kind of method adopting lignin as reducing agent to produce direct reduced iron
  • A kind of method adopting lignin as reducing agent to produce direct reduced iron
  • A kind of method adopting lignin as reducing agent to produce direct reduced iron

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Experimental program
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Effect test

Embodiment 1

[0047] Take lignin as a reducing agent, mix it with iron ore powder according to C / O=1 (molar ratio), then take 5g sample and put it into a cylindrical mold for cold pressing, the pressure is 12KPa, and the time is 3min. The diameter of the sample taken is 10mm and the height is 10mm. Wherein the lignin particle size exceeds 40 mesh sieve, and the content of iron ore powder particle size exceeds 200 mesh sieve is 92%.

[0048] Then put the pressed cylindrical sample into the reduction furnace and heat it up to 600°C for 30 minutes with the furnace temperature rising at a rate of 10°C / min, then raise the temperature to 1100°C for 30 minutes, and finally cool down to room temperature with the furnace, and flow through the whole process 3L / h nitrogen. Detection of changes in gas composition during the reaction, including NO 2 , NO, SO 2 and CO 2 , and detect the content of total iron and metallic iron of direct reduced iron after the reaction, and observe its microscopic morp...

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Abstract

The invention relates to the technical field of ironmaking, in particular to a method for producing direct reduced iron by using lignin as a reducing agent. The invention provides a method for preparing direct reduced iron with energy saving and environmental protection, simple process and high production efficiency, and the method meets the requirements of low energy consumption, low cost and environmental protection in iron and steel production.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a method for producing direct reduced iron by using lignin as a reducing agent. Background technique [0002] With the depletion of fossil energy and the deterioration of the ecological environment, the development of sustainable clean fuels and chemical products has received extensive attention. Biomass is the fourth largest energy after coal, oil, and natural gas. It is also a renewable green carbon source. It has excellent characteristics such as wide distribution, rich resources, low content of harmful elements, and low pyrolysis temperature. It is suitable for use as The heating agent or reducing agent in the ironmaking process can play the role of replacing coal coke and saving energy and reducing emissions. Biomass is an important raw material for the sustainable development of energy and chemical industry. According to statistics, 10% to 14% of the total global energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C08H7/00
CPCC08H6/00C21B13/0066
Inventor 相冬文姜鑫沈峰满郑艾军李洋王小艾王中华
Owner NORTHEASTERN UNIV LIAONING
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