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Thermal-state calcium-increasing modified stainless steel slag and use method thereof

A stainless steel slag and modification technology, applied in cement production and other directions, can solve the problems of low hydration activity and unstable volume of steel slag, and achieve the effects of good test block stability, reducing environmental pollution problems and improving activity index.

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 thermal calcium-increasing modified stainless steel slag and its use method, which solves the problems of low hydration activity and unstable volume of the existing steel slag

Method used

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  • Thermal-state calcium-increasing modified stainless steel slag and use method thereof
  • Thermal-state calcium-increasing modified stainless steel slag and use method thereof

Examples

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Effect test

Embodiment 1

[0034] This embodiment provides a kind of hot-state calcium-enriched modified stainless steel slag, which is made of 85.4% by weight stainless steel slag and 14.6% calcium oxide and heated in a high-temperature furnace to react to form a modified stainless steel slag. The preparation method includes the following step:

[0035] (1) Preparation of mixture: take stainless steel slag and calcium oxide and mix to form mixture A;

[0036] (2) Compression molding: use a mold with an inner diameter of 30mm, pressurize under a pressure of 50kN for 10 seconds, and press the mixture a into a cake b with a diameter of 30mm and a thickness of 8mm;

[0037] (3) Calcination: put the pressed material cake b into a high-temperature furnace, and calcine it at 1225 ° C ~ 1275 ° C for 150 minutes to form material cake c; within this temperature range, material cake c has a slight melting phenomenon, which proves that stainless steel slag powder a has undergone a solid phase reaction with analyt...

Embodiment 2

[0044] This embodiment provides a kind of hot-state calcium-enriched modified stainless steel slag, which is made of 80% by weight stainless steel slag and 20% calcium oxide and heated in a high-temperature furnace to react to form a modified stainless steel slag. The preparation method includes the following step:

[0045] (1) Preparation of mixture: take stainless steel slag and calcium oxide and mix to form mixture A;

[0046] (2) Compression molding: use a mold with an inner diameter of 30mm, pressurize under a pressure of 50kN for 10 seconds, and press the mixture a into a cake b with a diameter of 30mm and a thickness of 8mm;

[0047] (3) Calcination: put the pressed material cake b into a high-temperature furnace, and calcine it at 1225 ° C ~ 1275 ° C for 100 minutes to form material cake c; within this temperature range, material cake c has a slight melting phenomenon, which proves that stainless steel slag powder a has undergone a solid phase reaction with analytical...

Embodiment 3

[0054] This embodiment provides a kind of hot calcium-increased modified stainless steel slag, which is made of 95% by weight stainless steel slag and 5% calcium oxide and heated in a high-temperature furnace to react to form a modified stainless steel slag. The preparation method includes the following step:

[0055] (1) Preparation of mixture: take stainless steel slag and calcium oxide and mix to form mixture A;

[0056] (2) Compression molding: use a mold with an inner diameter of 30mm, pressurize under a pressure of 50kN for 10 seconds, and press the mixture a into a cake b with a diameter of 30mm and a thickness of 8mm;

[0057] (3) Calcination: put the pressed material cake b into a high-temperature furnace, and calcine it at 1225 ° C ~ 1275 ° C for 200 minutes to form material cake c; within this temperature range, material cake c has a slight melting phenomenon, which proves that stainless steel slag powder a has undergone a solid phase reaction with analytically pur...

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Abstract

The invention provides hot-state calcium-increasing modified stainless steel slag and a using method thereof, and belongs to the technical field of steel slag modification. The hot-state calcium-increasing modified stainless steel slag is generated by heating 80-95% of stainless steel slag and 5-20% of calcium oxide in a high-temperature furnace for reaction. The preparation method comprises the following steps: mixing stainless steel slag and calcium oxide to form a mixture A; pressing the mixture A into a material cake b by using a mold; calcining the material cake b in a high-temperature furnace to form a material cake C; 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; grinding the steel slag powder, and drying the modified stainless steel slag powder to constant weight; and adding 5% of dihydrate gypsum, and uniformly mixing the materials to obtain the hot-state calcium-increasing modified stainless steel slag. As a quenching method is adopted for treatment after calcination, various mineral crystal form components cannot be rearranged in time, and the dicalcium silicate crystal form is reserved as a beta form, so that the maximum activity of minerals can be stimulated.

Description

technical field [0001] The invention relates to the technical field of steel slag modification, in particular to a thermal calcium-increasing modified stainless 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 stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/06C04B7/19C04B7/42
CPCC04B5/06C04B7/19C04B7/42Y02P40/10
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