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Method for preparing alloy iron and cement material

A cement material and alloy iron technology, which is applied in chemical instruments and methods, cement production, manufacturing tools, etc., can solve the problems of inability to realize red mud resource utilization and high cost, and achieve reduction and harmlessness. High and improve the effect of comprehensive utilization of resources

Active Publication Date: 2019-01-25
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing red mud treatment methods, high-cost coke or coal powder reduction roasting is mainly used to recover the iron in it, and the obtained tailings are still solid waste, which cannot realize the resource utilization of red mud

Method used

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  • Method for preparing alloy iron and cement material

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Experimental program
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Effect test

Embodiment 1

[0043] The amount of waste incineration fly ash is 35wt%, and the amount of red mud is 65wt%. Mix the waste incineration fly ash and red mud evenly according to the proportion, put them into a crucible, and place the crucible in a muffle furnace for reduction roasting at 1200°C for 90 minutes; cooling, grinding once The fineness of the product -0.043mm is 71.32%, and the obtained product is magnetically separated under the condition of a magnetic field strength of 1.8kGs, and the iron grade can be obtained with an iron grade of 92.56%, and an iron recovery rate of 83.22%. ; The non-magnetic cement material is finely ground for the second time, and the fineness is -0.043mm, which is 97.36% and the specific surface area is 480m 2 / kg of cement material, the main phase of the cement material is vitreous body and tricalcium silicate, with water glass and sodium hydroxide as alkali activator, the compressive strength of 28 days is 78Mpa.

[0044] In this embodiment, the main chemic...

Embodiment 2

[0048] The amount of waste incineration fly ash is 40wt%, and the amount of red mud is 60wt%. Mix the waste incineration fly ash and red mud evenly according to the proportion, put them into a crucible, and place the crucible in a muffle furnace for reduction roasting at 1250°C for 60 minutes; cooling, the first stage The fineness of the grinding product -0.043mm is 73.48%. The obtained product is magnetically separated under the condition of a magnetic field strength of 1.8kGs, and the iron grade is 91.96%, and the iron recovery rate is 84.13%. Alloy iron; the non-magnetic cement material is finely ground twice to obtain a fineness of -0.043mm and 94.58% specific surface area of ​​550m 2 / kg of cement material, the main phase of the cement material is vitreous body and tricalcium silicate, with water glass and sodium hydroxide as alkali activator, the compressive strength of 28 days is 86Mpa.

[0049] In this embodiment, the main chemical components of waste incineration fly ...

Embodiment 3

[0054] The amount of waste incineration fly ash is 34wt%, the amount of red mud is 50wt%, and the amount of alumina reagent is 16wt%. The waste incineration fly ash, red mud, and alumina reagent are mixed evenly according to the proportion, then put into the crucible, and the crucible is placed in the muffle furnace at 1350°C Lower reduction roasting 90min; Cooling, the fineness of the primary grinding product -0.043mm is 69.32%, the product obtained is magnetically separated under the condition of a magnetic field strength of 1.8kGs, and can obtain iron grade 93.73%, iron recovery rate 85.94% containing trace Ni, Alloy iron of Cu, Cr and other ferrophilic metals; the non-magnetic cement material is subjected to secondary fine grinding, and the obtained fineness is -0.043mm, which is 92.14%, and the specific surface area is 571m 2 / kg, and CaO29.34%, Al 2 o 3 51.14%, a calcium aluminate material product whose main phase is calcium aluminate, and the calcium aluminate product ...

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Abstract

The invention provides a method for preparing alloy iron and a cement material and belongs to the field of resource recovery of solid wastes. According to the method, carbon, a synergistic effect of calcium and heavy metal components in garbage combustion fly ash and silicon, aluminum and silicon components in red mud is efficiently utilized to finally obtain the alloy iron and the cement materialand wastes are treated by wastes; components of the two wastes are complementary, and the carbon in the garbage combustion fly ash also can provide a reduction agent for reduction, so that iron minerals in the red mud are promoted to be reduced into metal iron; the metal iron is formed and siderophile heavy metal elements in the garbage combustion fly ash are promoted to enter an iron phase; meanwhile, the resource recovery of the solid wastes is realized through the cement material formed by Al2O2 and SiO2 in the red mud and CaO in the garbage combustion fly ash, so that recycling and comprehensive utilization of the two important dangerous wastes, which need to be urgently treated and include the garbage combustion fly ash and the red mud, and a lot of industrial solid wastes can be realized and the comprehensive utilization rate of resources is improved.

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 cement materials. Background technique [0002] In recent years, my country's domestic waste incineration technology has developed rapidly. As of the end of 2016, nearly 300 domestic waste incineration plants have been built nationwide, with a daily processing capacity of nearly 300,000 tons, accounting for more than 32% of the total amount of harmless disposal of urban domestic waste in my country. 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. Ho...

Claims

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Application Information

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IPC IPC(8): C04B7/26C22B1/02B03C1/02B09B3/00
CPCC22B1/02C04B7/243B03C1/02B09B3/00B09B5/00C04B2290/20B03C1/30Y02P40/121B09B2101/30B03C2201/20B09B3/40
Inventor 耿超刘建国吴世超于书尧
Owner TSINGHUA UNIV
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