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A kind of building molding material and method thereof produced by using silicon thermal method magnesium smelting waste slag as raw material

A technology of magnesium smelting waste slag and molding materials, which is applied in the field of building molding materials, can solve problems such as high production costs, large equipment investment, and complex production processes, and achieve the effects of reducing emissions, reducing molding pressure, and obvious economic and environmental benefits

Active Publication Date: 2020-11-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the obvious advantage of using various waste residues to produce building molding materials without using cement and other cementitious materials. However, this method requires carbonization gas pressure greater than 1bar, so it is necessary to control industrial CO 2 The exhaust gas is compressed and pressurized, and it needs to be carbonized and cured in a pressure vessel, which causes problems such as complex production process, large equipment investment and high production cost, and the product has no market competitiveness; in addition, due to γ-2CaO·SiO 2 Magnesium slag has basically no cohesiveness even after adding water. Experiments have found that under the molding pressure of tens of MPa or even one or two hundred MPa, some magnesium slag can hardly be pressed into prefabricated parts that can be produced and transported. Therefore, this method Difficult to put into practical industrial application

Method used

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  • A kind of building molding material and method thereof produced by using silicon thermal method magnesium smelting waste slag as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A kind of method of the present invention is that the waste slag of magnesium smelting of silicothermal method is raw material production building molding material, and its implementation steps are as follows,

[0062] Step 1, raw material preparation;

[0063] Take the non-moisture-absorbing magnesium smelting reduction waste slag after natural cooling and pulverization, sieve it with a 10-mesh sieve, manually roll all the sieve to 90 mesh, and evenly blend with the powdered sieve to prepare the Powdered magnesium slag raw material 10kg;

[0064] Step 2, stir and hydrate;

[0065] Pour the blended powdered magnesium slag raw material into the container, add water while stirring and mixing, until it can be kneaded into a block with hands, and the amount of water added is 3kg;

[0066] Step 3, compression molding;

[0067] Make a steel mold according to the standard brick size, take the raw materials after mixing and hydration, manually fill them into the mold, pound ...

Embodiment 2

[0072] Carry out according to the steps of Example 1, wherein use 30 mesh sieves to sieve the non-moisture-absorbing magnesium smelting reduction waste slag, and all the oversieves are manually rolled to 120 mesh to obtain 2.1 kg of magnesium slag raw materials; when proceeding to step 2 , the amount of water added is 0.42kg; when it comes to step 3, use a press to press the pressure of 1MPa to form it, and then get another piece of magnesia slag brick after demoulding; step 4 carbonization maintenance is carried out under the conditions of 0.15MPa and 30°C, and continuous maintenance After 6 hours, the magnesia slag brick was taken out, and the compressive strength of the magnesia slag brick was tested to be 40MPa, and the flexural strength was 12MPa.

Embodiment 3

[0074] Carry out according to the steps of Example 1, wherein use 90 mesh sieves to sieve the non-moisture-absorbing magnesium smelting reduction waste slag, and manually roll the oversize to 150 mesh to obtain 3.0 kg of magnesium slag raw material; when proceeding to step 2 , the amount of water added is 0.3kg; when it comes to step 3, use a press to press the pressure of 10MPa to form, and then get a magnesia slag brick after demoulding; step 4 carbonization maintenance is carried out under the conditions of 0.2MPa and 60°C, and continuous maintenance After 8 hours, the magnesia slag brick was taken out, and the compressive strength of the magnesia slag brick was tested to be 55MPa, and the flexural strength was 17MPa.

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Abstract

The invention discloses a building forming material produced by taking silicothermic waste residues as raw materials and a method for producing the building forming material. The method comprises thesteps:1, pulverizing reducing slag discharged by a silicothermic process reduction process to obtain a magnesium slag raw material, adding water while stirring before moisture absorption until the rawmaterials completely and uniformly absorb water without effusion and can be kneaded into blocks to obtain a stirred and hydrated magnesium slag raw material; 2, pressing the stirred and hydrated magnesium slag raw material under the pressure of 1-10 MPa to form a building forming material prefabricated member with a required shape; and 3, placing the prefabricated member in an atmosphere of smokedischarged by a dolomite calcining kiln adopted in a calcination process of a silicothermic process in a damp state, and carbonizing and curing the prefabricated member for 4-8 h by using CO2 gas inthe smoke atmosphere to obtain a carbonized magnesium slag formed building material. The building forming material not only has the advantages that other additives such as a gelatinizer, an admixtureand an excitant do not need to be added, but also is capable of greatly reducing the emission of CO2 serving as a greenhouse gas and obvious in economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of metallurgical waste slag reuse, in particular to a building molding material produced by using silicon thermal magnesium smelting waste slag as a raw material and a method thereof. Background technique [0002] Magnesium is one of the lightest structural metal materials, and has the advantages of high specific strength and specific stiffness, good damping and machinability, and easy recycling. 80% of the world's magnesium is produced in my country, and it is mainly smelted by silicon thermal reduction method. However, 1 ton of metal magnesium produced by this method will produce 5-6 tons of smelting waste, namely magnesium slag, and emit 5-6 tons of greenhouse gas CO 2 . In order to solve the environmental pollution problem of magnesium slag dust, direct landfill is mainly used for disposal at present, and only a small amount of magnesium slag is used as cement additive, or made into building bricks by adding ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/10C04B40/02
CPCC04B28/10C04B2111/00017C04B2201/50C04B18/144C04B40/0236C04B40/0259
Inventor 徐欣马建勋李宗文马鸿敏
Owner XI AN JIAOTONG UNIV
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