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Method for preparing tailing micro-aggregate and simultaneously producing magnetite

A technology of magnetite and tailings, applied in the direction of iron oxide/hydroxide, etc., can solve the problems of destroying the performance of cemented materials, flooding the surface of cemented materials, polluting the surface of cemented materials, etc., to reduce environmental pollution, Improved volume stability and simple manufacturing process

Active Publication Date: 2022-06-14
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the alkali content in the cementitious material is high, it may cause efflorescence on the surface of the cementitious material, contaminate the surface of the cementitious material, and damage the performance of the cementitious material

Method used

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  • Method for preparing tailing micro-aggregate and simultaneously producing magnetite
  • Method for preparing tailing micro-aggregate and simultaneously producing magnetite
  • Method for preparing tailing micro-aggregate and simultaneously producing magnetite

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] S1: Take 60 parts of steel slag, 20 parts of red mud, and 20 parts of fly ash and mix them evenly. The basicity of the mixture (CaO / SiO 2 The mass ratio) is 1.05, the mixture is ground to 150 mesh, and the mixture block is obtained by the pressure molding of 20MPa;

[0047] S2: use a heavy alumina crucible, put it into a high temperature box muffle furnace, heat the mixture to 1500°C under a nitrogen protective atmosphere to completely melt the mixture, the heating rate is 10°C / min, calcined for 30min, and then cooled to 1250°C ℃, the cooling rate is 15℃ / min, and the temperature is kept for 40min;

[0048] S3: Take out the sample and put it in water to cool to room temperature, then put the sample into a blast drying oven and dry it at 105°C for 24 hours, crush the dried sample, and grind it with a cement mill for 25 minutes to 50 mesh;

[0049] S4: The ground powder is subjected to magnetic separation with a magnetic separation tube, the magnetic field strength is 0.1...

preparation example 2

[0051] The method and raw materials are the same as those of Preparation Example 1, except that the difference lies in step S1, specifically: take 60 parts of steel slag, 30 parts of red mud, and 10 parts of fly ash, and mix them evenly, and the mixture alkalinity (CaO / SiO) 2 The mass ratio) was 1.24, the mixture was ground to 150 mesh, and the mixture block was obtained by pressure molding at 20 MPa.

preparation example 3

[0053] The method and raw materials are the same as those of Preparation Example 1, the difference is only in step S1, specifically: take 40 parts of steel slag, 40 parts of red mud, and 20 parts of fly ash and mix well, and the mixture alkalinity (CaO / SiO) 2 The mass ratio) was 0.81, the mixture was ground to 150 mesh, and the mixture block was obtained by pressure molding at 20 MPa.

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Abstract

The method comprises the following steps: mixing steel slag, an alkaline iron-containing solid waste and a siliceous modifier to obtain a mixture, adding the mixture into a high-temperature furnace, calcining in an inert atmosphere, cooling, then carrying out a thermal insulation reaction, and carrying out water cooling, drying, grinding and magnetic separation to obtain the magnetite and the tailing micro-aggregate. The alkaline iron-containing solid waste is selected from red mud or blast furnace ash. The preparation method provided by the invention can simultaneously treat the steel slag and various industrial solid wastes, realizes maximum resource utilization of the industrial solid wastes, reduces environmental pollution, and is simple in preparation process and suitable for large-scale production. The prepared tailing micro-aggregate is excellent in performance and can be used for replacing various building materials.

Description

technical field [0001] The invention belongs to the technical field of industrialized solid waste resource utilization, and in particular relates to a method for preparing tailings micro-aggregates and simultaneously producing magnetite. Background technique [0002] The use of solid waste in cement and other building materials is an effective way of recycling solid waste, with high environmental and economic benefits. Steel slag is a by-product of the steelmaking process. The massive accumulation of steel slag not only occupies a lot of land resources, but also the calcium, magnesium, manganese, phosphorus, sulfur and other substances in the steel slag will infiltrate into the ground under the action of rain erosion, causing pollution to the surrounding environment. [0003] Although the composition of steel slag is similar to that of cement, because the calcium silicate in steel slag is mainly composed of C 2 S (dicalcium silicate, 2CaO SiO 2 ) in the form of low early ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B20/02C01G49/02C04B28/04
CPCC04B20/04C04B20/023C04B20/02C04B28/04C01G49/02C04B2111/00017C04B2111/00724C04B2111/0075C04B2201/50C04B2201/52C04B18/142C04B18/0409C04B18/141C04B18/10C04B14/10Y02W30/91
Inventor 刘晓明郝先胜王亚光杜根杰鲁洋杨通元王梦凡
Owner UNIV OF SCI & TECH BEIJING
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