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Iron-rich metallurgy dust mud and high-calcium garbage incineration fly ash collaborative fusion treatment method

A technology for waste incineration fly ash and metallurgical dust sludge, applied in the direction of improving process efficiency, can solve the problems of large output, difficult to large-scale secondary resource utilization, etc., achieve high economic value, avoid the addition of binders, The effect of reducing energy consumption

Active Publication Date: 2019-10-25
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems that the current metallurgical industry has a large output of valuable metallurgical dust and sludge, it is difficult to use large-scale secondary resources, and waste incineration fly ash requires economical and efficient high-temperature harmless treatment and resource utilization, the purpose of the present invention is to provide a A method for synergistically processing iron-rich metallurgical dust and high-calcium waste incineration fly ash by melting method. Based on the chemical composition characteristics of iron-rich metallurgical dust and high-calcium waste incineration fly ash, the two are combined into pellets, And use the rotary hearth furnace reduction process to obtain high-quality granular iron, simultaneously obtain molten slag that can be used as raw material for refractory materials, and recover valuable zinc-containing dust and other non-ferrous metallurgical raw materials, realizing iron-rich zinc-containing dust sludge and waste incineration fly ash Harmless treatment and resource utilization have achieved the purpose of comprehensive utilization of solid waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Waste incineration fly ash (grate furnace incinerator fly ash with a calcium content higher than 20%) is pretreated by water washing under the condition of a solid-to-liquid ratio of 1kg:8L to remove soluble chloride salts, and filter to remove water to 16 %; mix iron-rich metallurgical dust (blast furnace gas ash with TFe content higher than 40%), coke powder and waste incineration fly ash pretreated by water washing, so that the composition of the mixture meets TFe=54.7%, n C / n O =1.2, (CaO+MgO) / SiO 2 = 1.4, press it into a flat agglomerate with a diameter of 25mm by using a double-roller ball press machine, and dry the agglomerate at 300°C for 20 minutes to keep the moisture content below 0.5%; spread the dried agglomerate into a carbon substrate In the rotary hearth furnace of raw material (sulfur content 0.3%, fixed carbon 80% biomass charcoal and anthracite mixed carbon-based fuel, mixed with magnesium slag at a mass ratio of 9:1), reduction is carried out at 1...

Embodiment 2

[0032]Waste incineration fly ash (grate furnace incinerator fly ash with a calcium content higher than 20%) is pretreated by washing with water at a solid-to-liquid ratio of 1kg:5L to remove soluble chloride salts, and press filter to remove water to 13 %; mix iron-rich metallurgical dust (converter mud with TFe content higher than 40%), biochar and waste incineration fly ash pretreated by washing, so that the composition of the mixture meets TFe=49.6%, n C / n O =1.1, (CaO+MgO) / SiO 2 = 1.2, use the double-roller briquetting machine to press it into a briquette with a diameter of 15 mm, and use the double-roller briquetting machine to press it into a flat agglomerate with a diameter of 15 mm. 0.5%; the dried agglomerate is spread into the carbon-based material (the mixed carbon-based fuel of biochar and anthracite with a sulfur content of 0.4% and 78% of fixed carbon, mixed with magnesium slag in a mass ratio of 8:1) In the rotary hearth furnace, the reduction was carried ou...

Embodiment 3

[0034] Waste incineration fly ash (fluidized bed incinerator fly ash with a calcium content higher than 20%) is pretreated by washing with water at a solid-to-liquid ratio of 1kg:5L to remove soluble chloride salts, and filter to remove water to 13 %; mix iron-rich metallurgical dust (TFe content higher than 40% iron scale), coke powder and waste incineration fly ash pretreated by washing, so that the composition of the mixture meets TFe=47.3%, n C / n O =1.0, (CaO+MgO) / SiO 2 = 1.1, use a double-roller briquetting machine to press it into a briquette with a diameter of 20 mm, and use a double-roller briquetting machine to press it into a flat agglomerate with a diameter of 20 mm. 0.5%; the dry agglomerate is spread into the carbon-based material (the mixed carbon-based fuel of biochar and anthracite with a sulfur content of 0.3% and 80% of fixed carbon, mixed with magnesium slag in a mass ratio of 10:1) In the rotary hearth furnace, the reduction is carried out at 1250°C, an...

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Abstract

The invention discloses an iron-rich metallurgy dust mud and high-calcium garbage incineration fly ash collaborative fusion treatment method. According to the method, high-calcium garbage incinerationfly ash is subjected to washing pretreatment and then is mixed with iron-rich metallurgy dust mud and a carbonaceous reducing agent, clusters are formed through pressing, drying is conducted, and block masses are obtained; carbon-based backing materials are distributed at the bottom of a rotary hearth furnace, then, the block masses are distributed on the surface layers of the carbon-based backing materials, fusion reducing is conducted, grained iron and CaO-SiO2-MgO-FeO slag is obtained, and zinc-rich raw materials are recycled from smoke. According to the method, through iron-rich metallurgy dust mud and high-calcium garbage incineration fly ash collaborative treatment, the garbage incineration fly ash is harmlessly treated, and meanwhile valuable utilization of metallurgy dust mud is achieved.

Description

technical field [0001] The invention relates to a method for reusing secondary metal resources, in particular to a method for synergistically processing iron-rich metallurgical dust and high-calcium waste incineration fly ash through a melting method to comprehensively recover metal resources such as iron and zinc and obtain raw materials for refractory materials The invention belongs to the technical field of harmless treatment and resource utilization of metallurgical solid waste and waste incineration fly ash. Background technique [0002] The rapid development of the metallurgical industry, especially the iron and steel industry has made a great contribution to the growth of the national economy, but a large amount of solid waste generated in the smelting production process has also caused pollution to the ecological environment. According to statistics, in 2018, my country's iron and steel industry contained Iron dust sludge production exceeded 80 million tons. Iron-bea...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/248C21B13/00C22B19/30C22B19/20
CPCC21B13/0066C22B1/248C22B7/001C22B19/20C22B19/30Y02P10/20
Inventor 甘敏范晓慧汪国靖叶恒棣王兆才周志安季志云陈许玲黄晓贤袁礼顺
Owner CENT SOUTH UNIV
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