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Iron ore sintered biomass fuel and preparation method and application thereof

A biomass fuel and biomass technology, which is applied in the field of biomass sintering fuel to replace fossil fuels to achieve emission reduction, iron ore sintering fuel, and biomass sintering fuel, can solve the problems of large reactivity gap and asynchronous fuel combustion, etc. To achieve the effect of low volatile content, reducing damage, and compact structure

Active Publication Date: 2020-01-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the large gap between the reactivity of biomass fuel used for iron ore sintering in the pyrolysis process and fossil fuels in the prior art, resulting in the defect of asynchronous fuel combustion in the sintering process

Method used

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  • Iron ore sintered biomass fuel and preparation method and application thereof
  • Iron ore sintered biomass fuel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The mixed slag of cotton straw, iron beneficiation tailing slag and silica tailing slag (SiO 2 70%, Fe 2 O 3 30%) respectively grind to 0.2~0.6mm, 0~0.005mm, according to the mass percentage of 99%, 1% respectively, mix uniformly, and then under the mechanical pressure of 400kg / cm 3 , Compress the mixed biomass into biomass particles under the conditions of compression time 0.5min and room temperature. The particles are first heated to 200°C at a heating rate of 20°C / min and stayed for 30 minutes to complete low-temperature pretreatment. Then the particles are heated to 600°C at a heating rate of 5°C / min and stay for 15 minutes, and the carbonization process Keep the atmosphere at N 2 85%, Ar15%, gas flow rate is 0.05L / min. The prepared biomass has a combustion heat value of 27MJ / kg, a volatile content of 2.0%, and a specific surface area of ​​20m 2 / g, porosity is 19%, apparent density is 1.7g / cm 3 . Substituting 40% coke powder with fixed carbon content for iron ore...

Embodiment 2

[0034] The mixed slag of cotton straw, iron beneficiation tailing slag and silica tailing slag (SiO 2 60%, Fe 2 O 3 40%) respectively grind to 0.2~0.6mm, 0~0.005mm, according to the mass percentage of 98.5%, 1.5% respectively, mix uniformly, and then under the mechanical pressure of 500kg / cm 3 , Compress the mixed biomass into biomass particles under the conditions of compression time 1min and compression temperature 70℃. Heat the particles to 250°C at a heating rate of 15°C / min and stay for 40 minutes to complete the low-temperature pretreatment, then heat the particles to 650°C at a heating rate of 4°C / min, and stay for 20 minutes, the carbonization process Keep the atmosphere at N 2 85%, Ar 15%, gas flow rate is 0.05L / min. The prepared biomass has a combustion heat value of 28MJ / kg, a volatile content of 1.5%, and a specific surface area of ​​17m 2 / g, porosity is 16%, apparent density is 1.85g / cm 3 . Substituting 50% coke powder with fixed carbon content for iron ore sint...

Embodiment 3

[0036] The mixed slag of cotton straw, iron beneficiation tailing slag and silica tailing slag (SiO 2 80%, Fe 2 O 3 20%) respectively grind to 0.2~0.6mm, 0~0.005mm, according to the mass percentage of 98%, 2% respectively, mix uniformly, and then under the mechanical pressure of 600kg / cm 3 , Compress the mixed biomass into biomass particles under the conditions of compression time 1min and compression temperature 70℃. The particles are heated to 250°C at a heating rate of 15°C / min and stay for 40 minutes to complete the low-temperature pretreatment. Then the particles are heated to 700°C at a heating rate of 3°C / min and stay for 25 minutes, and the carbonization process Keep the atmosphere at N 2 85%, Ar 15%, gas flow rate is 0.05L / min. The prepared biomass has a combustion heat value of 30MJ / kg, a volatile content of 1.2%, and a specific surface area of ​​15m 2 / g, porosity is 14%, apparent density is 2.0g / cm 3 . Substituting its fixed carbon content for 55% of coke powder f...

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Abstract

The invention discloses an iron ore sintered biomass fuel and a preparation method and application thereof. The preparation method comprises the steps that biomass powder is mixed with iron selectingtailing slag-silica tailing slag mixed powder and then are pressed into biomass particles; and the biomass particles are placed in a protective atmosphere and then subjected to low-temperature pretreatment and high-temperature carbonization treatment in sequence to obtain high quality biomass fuel with heat value of 26-33MJ / kg, volatile content of 0.5-3%, specific surface area of 10-25m<2> / g, porosity of 15-25%, apparent density of 1.5-2.2g / cm<3>. According to the iron ore sintered biomass fuel, the combined effects of inert components SiO2 in ore slag to weaken the thermochemical reaction activity of the biomass fuel and iron oxides to promote the efficient cracking of volatiles are fully utilized, and can replace the use of biomass fuel of fossil fule with high proportions to achieve efficiently reducing the emission of SOx, NOx and CO2 from the source.

Description

Technical field [0001] The invention relates to biomass sintering fuel, in particular to an iron ore sintering fuel prepared by synergistic resource utilization of tailings slag and waste biomass and a method thereof, and also relates to a method for replacing fossil fuels with biomass sintering fuel to achieve emission reduction, and belongs to steel Sintering technology in the field of metallurgy. Background technique [0002] In the production process of iron and steel enterprises, the energy consumption of the sintering process accounts for about 10% of the total energy consumption, and the consumption of solid fuel accounts for about 80% of the energy consumption of the process. The solid fuel consumed by traditional sintering is mainly anthracite coal powder and crushed coke powder. At present, the world's energy form is becoming increasingly severe, the price of fossil fuels continues to rise, and the cost of sintering remains high; at the same time, the combustion of fos...

Claims

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Application Information

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IPC IPC(8): C10L5/44C10L9/10
CPCC10L5/442C10L5/445C10L9/10Y02E50/10Y02E50/30
Inventor 季志云范晓慧甘敏李浩锐倪佳苗陈许玲黄晓贤袁礼顺黄斌斌武钰峰吕薇唐庆余汪国靖
Owner CENT SOUTH UNIV
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