Method for preparing alloy iron and glass ceramics

A technology of glass-ceramics and alloy iron, which is applied in the field of solid waste recycling, can solve the problems of low utilization rate and inability to realize resource utilization of waste incineration fly ash and red mud, achieve high economic value, improve comprehensive utilization rate of resources, The effect of excellent comprehensive performance

Active Publication Date: 2018-12-18
TSINGHUA UNIV
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Problems solved by technology

[0004] Chinese patent CN201510736743.X discloses a co-processing method of red mud and domestic waste incineration fly ash. By activating the red mud to form a heavy metal curing agent, it is combined with the waste incineration fly ash, solidified and formed after pulping, and the red mud can be Coordinated treatment and disposal of waste incineration fly ash and household waste incineration fly ash, but there is still a problem that the utilization rate is low and the resource utilization of waste incineration fly ash and red mud cannot be realized

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  • Method for preparing alloy iron and glass ceramics
  • Method for preparing alloy iron and glass ceramics
  • Method for preparing alloy iron and glass ceramics

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Effect test

Embodiment 1

[0052]The process conditions for preparing alloy iron and glass-ceramic from waste incineration fly ash and red mud are as follows: the amount of waste incineration fly ash is 33%, and the amount of red mud is 67%; the waste incineration fly ash and red mud are mixed evenly in proportion and put into the crucible , place the crucible in an induction furnace at 1300°C for reduction and melting for 120 minutes; quench it with water, crush it to -2mm with a crusher, and separate it by magnetic separation at a magnetic field strength of 110kA / m. The iron grade of 94.56% and the iron recovery rate of 85.47% can be obtained. Direct reduction alloy iron of trace ferrophile metals such as Ni and Cu; dry the crushed glass slag and place it in a crystallization furnace for heat treatment. 1200℃, until the glass slag completely slumps, and finally cools with the furnace. The glass-ceramic product was taken out from the crystallization furnace, and polished to obtain glass-ceramics. The p...

Embodiment 2

[0059] The process conditions for preparing alloy iron and glass-ceramics from waste incineration fly ash and red mud are as follows: the amount of waste incineration fly ash is 36%, the amount of red mud is 64%, and the waste incineration fly ash and red mud are mixed evenly in proportion and put into the crucible , place the crucible in an induction furnace at 1400°C for reduction and melting for 100 minutes; quench it with water, crush it to -2mm with a crusher, and separate it by magnetic separation at a magnetic field strength of 110kA / m. The iron grade of 93.94% and the iron recovery rate of 87.11% can be obtained. Direct reduction of alloy iron with trace amounts of Ni, Cu and other iron-loving metals; dry the water-quenched broken glass slag and place it in a crystallization furnace for heat treatment. Raise the temperature to 1200°C until the glass slag completely collapses, and finally cool down with the furnace. The glass-ceramic product is taken out from the crysta...

Embodiment 3

[0067] The process conditions for preparing alloy iron and glass ceramics from waste incineration fly ash and red mud are as follows: the amount of waste incineration fly ash is 40%, and the amount of red mud is 60%; the waste incineration fly ash and red mud are mixed evenly according to the proportion and put into the crucible , place the crucible in an induction furnace at 1600°C for reduction and melting for 90 minutes; quench it with water, crush it to -2mm with a crusher, and separate it by magnetic separation at a magnetic field strength of 110kA / m. Direct reduction alloy iron with trace amounts of ferrophilic metals such as Ni and Cu; dry the water-quenched broken glass slag and place it in a crystallization furnace for heat treatment. Raise the temperature to 1180°C until the glass slag completely collapses, and finally cool down with the furnace. The glass-ceramic product is taken out from the crystallization furnace, and the glass-ceramic product can be obtained by ...

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Abstract

The invention provides a method for preparing alloy iron and glass ceramics, and belongs to the field of solid waste recycling. The method is characterized in that a syneryistic effect between carbon,calcium and heavy metal components in waste incineration fly ash, and iron, aluminum, silicon and titanium main components in red mud is efficiently utilized, so that alloy iron and glass ceramics can be finally obtained, and therefore, waste is treated with waste, to-be-treated important hazardous wastes of waste incineration fly ash and red mud, and bulk industrial solid waste are recycled andcomprehensively utilized, a resource comprehensive utilization rate is increased, resource-saving type society is favorably established, a higher economic value can be realized, an alloy iron productis obtained through high-temperature reductive smelting and thermal treatment, and the alloy iron product is higher than iron concentrate in price; the alloy iron product contains trace elements suchas Ni and Cu, and has a higher value than that of a directly reduced iron product; and the obtained glass ceramic is better and more excellent in comprehensive performance as a small amount of titanium oxide and heavy metal is contained.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a method for preparing alloy iron and glass ceramics. Background technique [0002] In recent years, my country's domestic waste incineration has developed rapidly. The flue gas purification process of waste incineration produces a large amount of fly ash. According to the estimated amount of waste incineration, the amount of fly ash produced will reach about 10 million tons in 2020. Due to the enrichment of heavy metals and dioxins and complex characteristics, fly ash from waste incineration is a hazardous waste listed in the "National Hazardous Waste List" and requires special management. However, at present, the harmless disposal rate of fly ash in my country is relatively low, which is a weak link in the pollution control of waste incineration and environmental management of hazardous waste in my country. Based on the basic properties of fly ash, high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/06C03B32/02C22B7/00C21B15/00
CPCC03B32/02C03C10/0063C21B15/00C22B7/001Y02P10/20
Inventor 耿超刘建国吴世超贾宇锋
Owner TSINGHUA UNIV
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