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A method for collaborative resource treatment of garbage fly ash and metallurgical dust

A garbage fly ash and recycling technology, applied in the field of solid dust and garbage fly ash comprehensive treatment, can solve the problems of corrosive equipment, large investment, high energy consumption, etc., and achieve the effect of avoiding waste of resources

Active Publication Date: 2019-10-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, in the process of using high-temperature treatment of waste fly ash, due to the high Cl content in waste fly ash, it is easy to corrode equipment, and high-temperature treatment of waste fly ash alone has problems such as high energy consumption and large investment

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  • A method for collaborative resource treatment of garbage fly ash and metallurgical dust
  • A method for collaborative resource treatment of garbage fly ash and metallurgical dust

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Embodiment 1

[0027] The garbage fly ash, metallurgical dust, and solid fuel are prepared to make iron grade 47%, is 0.3, is 0.6, n (Cl) / n (2Pb+2Zn+K+Na) 0.85, the total carbon content is 10% of the mixture, made into pellets with a particle size of 12mm, and dried at 80°C for 60 minutes, and then the dried pellets were roasted at 1300°C for 10 minutes, and dusted with a bag filter The valuable metal dust in the flue gas was collected, and the composition of the final roasted product is shown in Table 1. The high temperature treatment process effectively removes K, Na, Pb, Zn, the contents are all lower than 0.05%, the dioxin in the fly ash is effectively degraded, the final iron grade of the agglomerate is 49.2%, and the drum strength is 79%, which can be used as a blast furnace Furnace charge. The removal rates of K, Na, Pb, and Zn in the roasting process are shown in Table 2, and the removal rates are all above 90%, so they can be enriched in flue gas and dust for recycling.

Embodiment 2

[0029] The waste fly ash, metallurgical dust, and solid fuel are prepared into 45% iron grade, is 0.25, is 0.5, n (Cl) / n (2Pb+2Zn+K+Na)1.0, the total carbon content of the mixture is 5%, made into pellets with a particle size of 10mm, and dried at 150°C for 20min, and then the dried pellets were roasted at 1150°C for 60min, and dusted with a bag filter. The valuable metal dust in the flue gas was collected, and the composition of the final roasted product is shown in Table 1. The high-temperature treatment process can effectively remove K, Na, Pb, and Zn, and ensure that the content in the agglomerate is less than 0.05%. The final iron grade of the agglomerate is 47.3%, and the drum strength is 75%. It can be used as a blast furnace ironmaking charge. The removal rates of K, Na, Pb, and Zn during the roasting process are shown in Table 2. The removal rates of K, Na, and Pb are all above 90%, and the removal rate of Zn also reaches 88.34%, so that it can be enriched in th...

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Abstract

The invention discloses a synergetic resource processing method of waste fly ashes and metallurgical dust. The synergetic resource processing method of the waste fly ashes and the metallurgical dust comprises the following steps that after the waste fly ashes, the metallurgical dust and solid fuel mixed materials are prilled or briquetted, drying and high-temperate roasting are conducted, smoke dust containing K, Na, Pb and Zn is recovered from smoke, and slag materials are iron-contained furnace materials. By means of the synergetic resource processing method of the waste fly ashes and the metallurgical dust, the qualified iron-contained furnace materials with harmful element content being below 0.05% can be obtained and can be directly used as ironmaking raw materials, the smoke dust which is rich in valuable metals such as K, Na, Pb and Zn is recovered, self-contained dioxin of the fly ashes is degraded, and the purpose of synergetic resource of the waste fly ashes and the metallurgical dust is achieved.

Description

technical field [0001] The invention relates to a method for synergistic processing of garbage fly ash and metallurgical dust, in particular to a method for producing qualified iron smelting charge and recovering elements such as K, Na, Pb and Zn from garbage fly ash and metallurgical dust, belonging to solid dust, Technical field of garbage fly ash comprehensive treatment. Background technique [0002] Waste incineration 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, accounting for about 3-5% of the amount of waste incinerated. Incineration fly ash contains easily leached heavy metal pollutants and highly toxic dioxins. According to the "National Hazardous Waste List" implemented in my country on August 1, 2016, waste incineration fly ash belongs to HW18, which is a hazardous waste. Environmental and human health hazards are enormous. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00C22B7/02C22B1/02
CPCB09B3/00B09B5/00C22B1/02C22B7/001C22B7/02Y02P10/20
Inventor 范晓慧汪国靖甘敏姜涛陈许玲李光辉袁礼顺季志云王壮壮黄柱成杨永斌郭宇峰张元波李骞朱忠平黄康郑如月姚佳文肖永贤王巧
Owner CENT SOUTH UNIV
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