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A method for controlling sinter quality and dioxin generation by using waste-derived carbon

A technology of deriving carbon and sintered ore, applied in the direction of improving process efficiency, etc., can solve problems such as increased concentration of combustible gas and organic pollutants, reduced production of coke powder, and decreased mechanical strength of sintered ore

Active Publication Date: 2022-03-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The carbon content of garbage-derived carbon is 60-80%, the low calorific value is 18.32-30.36MJ / kg, but the ash content is as high as 19-38% (the CaO content in the ash is as high as 40%), and the patent application number is 201810027221.6 invention patent Attempts have been made to assist iron ore sintering based on domestic waste-derived carbon, and use waste-derived carbon to replace part of coke powder to assist iron ore sintering. Experiments have found that when the proportion of waste-derived carbon instead of coke powder does not exceed 30%, the sintering of waste-derived carbon-assisted iron ore has a positive effect on sintering. The mechanical strength of the ore (falling index and drum index) is less affected, but when the ratio of waste-derived carbon instead of coke powder exceeds 30%, the mechanical strength of sintered ore decreases rapidly
Therefore, the ratio of waste-derived carbon to replace coke powder is limited, and it is difficult to further reduce the waste of resources and environmental pollution caused by the production of coke powder. At the same time, in the experiment, our research group found that excessive waste-derived carbon assisted iron ore sintering, resulting in rapid mechanical strength of sinter In addition to the decline, it will also reduce the combustion efficiency of solid fuels, resulting in an increase in the concentration of combustible gases and organic pollutants (dioxins and volatile organic compounds (VOCs), etc.) in the flue gas

Method used

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  • A method for controlling sinter quality and dioxin generation by using waste-derived carbon
  • A method for controlling sinter quality and dioxin generation by using waste-derived carbon
  • A method for controlling sinter quality and dioxin generation by using waste-derived carbon

Examples

Experimental program
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Embodiment 1

[0075] Configure 50Kg of raw materials: the mass percentages of mixed ore, return ore, solvent, and fuel are 58.27%, 24%, 13%, and 4.73% in sequence. The solvent includes quicklime, dolomite, and limestone, and the mass percentages are 3%, 4%, and 6% in sequence. The fuel is coke powder, and a sintering cup experiment is carried out. During the sintering cup experiment, a S Type thermocouple, make the thermocouple penetrate into the sintering cup about 110mm, monitor the temperature of the material layer in the sintering process by connecting the thermocouple to the temperature display, and obtain the curve of the temperature of the sintering cup with the sintering time, and calculate according to the curve: initial softening and melting temperature , the maximum sintering temperature, and the vertical sintering speed, and the concentration of dioxins in the sintering flue gas was monitored by a Shimadzu QP2010 gas chromatography-mass spectrometer.

Embodiment 2～ Embodiment 12

[0077] Configure 50Kg of raw materials: the mass percentages of mixed ore, returned ore, quicklime, dolomite, limestone, coke powder, and garbage-derived carbon are configured according to Table 6, and then the sintering cup experiment is carried out, and the initial softening and melting temperature and the maximum sintering temperature are measured at the same time. , vertical sintering speed, and the concentration of dioxins in the flue gas.

[0078] Table 6

[0079]

[0080] Table 6 shows the optimization of fuel and solvent structure and the optimized ore blending schemes of various garbage-derived carbons under the condition of ensuring the sintering mixture taste unchanged in Examples 1 to 12. Table 7 shows the influence of different sintering raw material structures on the melting temperature and the temperature of the sintering material layer in Examples 1 to 12. Table 8 shows the effects of different waste-derived carbon optimized ore mixes on sinter quality and ...

Embodiment 13～ Embodiment 14

[0087] Configure 5 groups of 50Kg raw materials of embodiment 13 in the manner of embodiment 1, configure 5 groups of 50Kg raw materials of embodiment 14 in the manner of embodiment 4, in each group of raw materials: mixed ore, return ore, unslaked lime, dolomite, limestone , coke powder, and waste-derived carbon are configured in turn according to Table 9, and the sintering cup experiment is carried out, and the figure 1 The sintering flue gas extracted from the bottom of each group of sintering cups is mixed with the combustion-supporting air 5 and introduced into each group of sintering cups. In the 5 groups of experiments in Example 13 and Example 14, the mixing amount of sintering flue gas is the introduced combustion-supporting air and 0%, or 20%, or 30%, or 40%, or 50% of the total volume of liquefied gas, and simultaneously measure the initial softening and melting temperature, the maximum sintering temperature, the vertical sintering speed, and the drum of the sample a...

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Abstract

The invention discloses a method for regulating the quality of sintered ore and the generation of dioxins by using garbage-derived carbon. By optimizing the structure and ratio of solid fuel and solvent in sintering ingredients, the ratio of garbage-derived carbon in sintered solid fuel can be increased to 30-50% %; For the change of alkali metal content caused by the increase of garbage-derived carbon in sintering ingredients, the structure of low-temperature ore-forming raw materials is constructed by optimizing ore blending with garbage-derived carbon to adapt to the characteristics of low temperature of sintering material layer. Under the premise of balanced content, it can be rapidly melted and ore-formed at a lower temperature to generate sufficient liquid phase intermediates. At the same time, it is supplemented by hot flue gas circulation to regulate the structure and quality of sintered ore and reduce dioxins during sintering. Emission of organic pollutants.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of municipal solid waste treatment and coal chemical technology, and more specifically relates to a method for regulating the quality of sintered ore and the generation of dioxins by using waste-derived carbon. Background technique [0002] Iron ore sintering is to mix iron ore powder, solid fuel (coke powder / anthracite) and flux (the main component is CaO) in a certain proportion, arrange them on the sintering machine, and generate high temperature by means of solid fuel combustion to generate a certain amount of liquid intermediate. The body wets and bonds the iron ore particles to form a porous massive sinter with a certain strength. [0003] The carbon content of garbage-derived carbon is 60-80%, the low calorific value is 18.32-30.36MJ / kg, but the ash content is as high as 19-38% (the CaO content in the ash is as high as 40%), and the patent application number is 201810027221.6 inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16Y02P10/20
Inventor 秦林波秦万里韩军赵波陈旺生张强
Owner WUHAN UNIV OF SCI & TECH