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Sulphoaluminate modified carbon steel slag and use method thereof

A technology of sulfoaluminate and modified carbon, which is applied in the field of carbon steel slag modification, can solve the problems of operation difficulty and cost increase, and achieve the effects of increased activity index, high structural activity, and simple quenching method

Pending Publication Date: 2021-09-17
刘新阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a sulfoaluminate modified carbon steel slag and its use method, which solves the problems of operation difficulty and cost increase in the existing carbon steel slag modification

Method used

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  • Sulphoaluminate modified carbon steel slag and use method thereof
  • Sulphoaluminate modified carbon steel slag and use method thereof

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Effect test

Embodiment 1

[0037] This embodiment provides a sulfoaluminate modified carbon steel slag, the preparation method of which comprises the following steps:

[0038](1) Prepare the mixture: Mix carbon steel slag and modifier with a weight ratio of 4:1 to form mixture A; put the carbon steel slag in a drying oven at 105°C before mixing until the moisture content is 0.6%, and use Disc mill and ball mill grind it to a specific surface area of ​​350m 2 / kg of carbon steel slag powder; the modifier is composed of fly ash and β-type hemihydrate gypsum with a weight ratio of 3:1; the fly ash is dried to a moisture content of 0.8% before mixing;

[0039] (2) Compression molding: use a mold with an inner diameter of 30mm, set the press to pressurize the mixture A with a force of 50kN for 10 seconds, and press the mixture into a cake B with a diameter of 30mm and a thickness of 9mm;

[0040] (3) Calcination: put the cake B in step (2) into a high-temperature furnace for calcination at 1220°C~1230°C for...

Embodiment 2

[0047] This embodiment provides a sulfoaluminate modified carbon steel slag, the preparation method of which comprises the following steps:

[0048] (1) Preparation of mixture: Mix carbon steel slag with modifier at a weight ratio of 3:1 to form mixture A; put carbon steel slag in a drying oven at 105°C before mixing until the moisture content is 0.9%, and use Disc mill and ball mill grind it to a specific surface area of ​​350m 2 / kg of carbon steel slag powder; the modifier is composed of fly ash and β-type hemihydrate gypsum with a weight ratio of 4:1; the fly ash is dried to a moisture content of 1% before mixing;

[0049] (2) Compression molding: use a mold with an inner diameter of 30mm, set the press to pressurize the mixture A with a force of 50kN for 10 seconds, and press the mixture into a cake B with a diameter of 30mm and a thickness of 9mm;

[0050] (3) Calcination: put the cake B in step (2) into a high-temperature furnace for calcination at 1220°C~1230°C for 50...

Embodiment 3

[0057] This embodiment provides a sulfoaluminate modified carbon steel slag, the preparation method of which comprises the following steps:

[0058] (1) Preparation of mixture: Mix carbon steel slag with modifier at a weight ratio of 5:1 to form mixture A; put carbon steel slag in a drying oven at 105°C before mixing until the moisture content is 1%, and use Disc mill and ball mill grind it to a specific surface area of ​​350m 2 / kg of carbon steel slag powder; the modifier is composed of fly ash and β-type hemihydrate gypsum with a weight ratio of 2:1; the fly ash is dried to a moisture content of 0.6% before mixing;

[0059] (2) Compression molding: use a mold with an inner diameter of 30mm, set the press to pressurize the mixture A with a force of 50kN for 10 seconds, and press the mixture into a cake B with a diameter of 30mm and a thickness of 9mm;

[0060] (3) Calcination: put the cake B in step (2) into a high-temperature furnace for calcination at 1220°C~1230°C for 20...

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Abstract

The invention provides sulphoaluminate modified carbon steel slag, a preparation method of which comprises the following steps: mixing carbon steel slag and a modifier to form a mixture A; pressing and forming: pressing the mixture into a material cake B; calcining: calcining the material cake B in a high-temperature furnace at 1220-1230 DEG C to form a material cake C; quenching: cooling the material cake C in a high-temperature furnace, taking out the material cake C when the temperature is reduced to 700 DEG C, and quenching the material cake C to room temperature to obtain sulphoaluminate modified carbon steel slag D; and powder preparation: grinding the sulphoaluminate modified carbon steel slag D into fine powder, then adding 5% of dihydrate gypsum as a grinding aid, and carrying out ball milling together with the modified carbon steel slag to obtain the modified carbon steel slag powder. After the modifier is added into the carbon steel slag, the carbon steel slag is mixed with cement mortar, the activity index of a mortar test block is greatly improved, and the activity indexes of 3d and 28d are both close to 100% at most; moreover, during tests, the surface and the test block are good in stability, and can be used as a mixed material to be doped into cement.

Description

technical field [0001] The invention relates to the technical field of carbon steel slag modification, in particular to a sulphoaluminate modified carbon steel slag and a use method thereof. Background technique [0002] Steel slag is a solid waste obtained by cooling the molten waste whose temperature is above 1400°C in the steelmaking process. The emission of steel slag is about 10-15% of steel production. According to the data from the National Bureau of Statistics, my country's crude steel output in 2017 was 831.728 million tons, a year-on-year increase of 5.7%, so the production of steel slag in 2017 was about 108.125 million tons. In the national "Eleventh Five-Year Development Plan", it is pointed out that the comprehensive utilization rate of steel slag should reach more than 86%, and basically realize zero discharge. However, the current situation of China's comprehensive utilization is far from this plan. The utilization rate is only 30%, and there is still a lot...

Claims

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Application Information

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IPC IPC(8): C04B20/04C04B18/14
CPCC04B20/04C04B18/142C04B20/023Y02W30/91
Inventor 刘新阳蔡基伟李汶晋刘毅豪张东岭宋朋伟贾翔宇史俊礼亢飞翔王贺月付晓宇曹鑫袁英豪罗斐
Owner 刘新阳