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Dioxin control method in iron ore sintering co-processing garbage fly ash process

A technology of waste fly ash and co-processing, applied in chemical instruments and methods, improvement of process efficiency, removal of solid waste, etc., can solve problems such as environmental pollution, reduce excitation points, reduce the probability of dioxin generation, prevent Effects of harmful gases escaping

Active Publication Date: 2019-07-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the volatilization and secondary generation of harmful substances such as dioxins in the high-temperature treatment process of garbage fly ash in the prior art, which cause environmental pollution, the purpose of the present invention is to provide a method for treating waste fly ash by using the sintering process in the steel production process Garbage fly ash, on the premise of not affecting the output and quality of sinter, realizes the effective consolidation of fly ash and the efficient degradation of dioxin in fly ash, so as to realize the clean disposal of garbage fly ash

Method used

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  • Dioxin control method in iron ore sintering co-processing garbage fly ash process

Examples

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Embodiment 1

[0032] Mix the garbage fly ash with 5% milk of lime, 15% biochar and 2% municipal sludge (moisture content is about 30%) to make pellets with a particle size of 4mm, and Dry at 80°C for 60 minutes (dry until the water content is less than 5%); then mix the conventional sintering raw materials and then granulate, and add them evenly along the horizontal axis of the cylinder granulator at the last 1 minute after the sintering raw materials are granulated, so that the fly ash is small The balls and sintering raw materials are mixed evenly, the amount of fly ash pellets is 2% of the mass of sintering raw materials, and the obtained mixture is ignited and sintered after being distributed. , the sintering index and the dioxin content in the flue gas are shown in Table 1. It can be seen that the sintering index equivalent to the benchmark can be obtained after the waste fly ash is granulated and dried, and the dioxin content in the fly ash is 91.25%. %. It can be seen that compared ...

Embodiment 2

[0034] Garbage fly ash was evenly mixed with milk of lime accounting for 10% of the mass of fly ash, 6% of biochar and 5% of municipal sludge (moisture content about 35%), and made into pellets with a particle size of 6mm. Dry at ℃ for 20 minutes (dry until the moisture content is less than 5%); then mix the conventional sintering raw materials and then granulate, and add them evenly along the horizontal axis of the cylinder granulator at the last 1 minute after the sintering raw materials are granulated, so that the fly ash pellets Mix evenly with the sintering raw materials, the amount of fly ash pellets is 1% of the mass of the sintering raw materials, and the obtained mixture is ignited and sintered after being distributed. The sintering index and the dioxin content in the flue gas are shown in Table 1. It can be seen that the sintering index equivalent to the benchmark can be obtained by adding the garbage fly ash to sintering after granulation and drying, and the degradat...

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Abstract

The invention discloses a method for controlling dioxin in the process of iron ore sintering synergistic treatment of garbage fly ash. The method comprises mixing, granulating and drying the four components of garbage fly ash, milk of lime, flammable solid fuel and sludge. , to obtain pellets containing garbage fly ash; iron ore sintering raw materials are granulated and mixed with the pellets containing garbage fly ash, and then ignited and sintered after the cloth is placed; this method realizes The efficient degradation of dioxin contained in fly ash itself prevents the secondary formation of dioxin in the sintering process of garbage fly ash; this method not only makes the degradation rate of dioxin in garbage fly ash reach more than 90%, but also ensures the The effective consolidation of the fly ash achieves the purpose of cleaning the waste fly ash during the sintering process.

Description

technical field [0001] The present invention relates to a method for processing garbage fly ash, in particular to a method for synergistically treating garbage fly ash by using iron ore sintering process, and in particular to a method for utilizing iron ore sintering to realize dioxin and other persistent organic matter in garbage fly ash The decomposition method belongs to the technical field of waste fly ash treatment. Background technique [0002] Garbage fly ash is the fine particle matter captured in the flue gas purification system and heat recovery system (such as economizer, waste heat boiler, etc.) of waste incineration plants. It is an inevitable product of waste incineration, accounting for about 3-5 %. In my country, due to the failure to effectively classify waste before incineration, the incineration fly ash contains easily leached heavy metal pollutants and highly toxic dioxins. According to the "National Hazardous Waste List" implemented on August 1, 2016 It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C22B1/244
CPCC22B1/244B09B3/00B09B2101/30Y02P10/20
Inventor 范晓慧甘敏周志安刘水石汪国靖姜涛陈许玲季志云李光辉袁礼顺王壮壮黄柱成杨永斌郭宇峰张元波李骞朱忠平王英坡孙亚飞王燕南赵新泽田野
Owner CENT SOUTH UNIV
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