Method for preparing concrete micro-expansion agent from industrial solid waste steel slag

A technology of industrial solid waste and micro-expansion agent, applied in the field of building materials, can solve the problems of high grinding energy consumption, long storage time, poor grindability, etc.

Active Publication Date: 2021-04-27
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the three major problems of low activity, poor volume stability, poor grindability and high grinding energy consumption that restrict the use of high added value of steel slag. Bad problem, low production cost method for preparing concrete micro-expansive agent from industrial solid waste steel slag

Method used

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  • Method for preparing concrete micro-expansion agent from industrial solid waste steel slag
  • Method for preparing concrete micro-expansion agent from industrial solid waste steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) After the industrial solid waste steel slag is crushed to a particle size of 10mm, then demagnetized and screened to remove the iron phase in the steel slag;

[0040] After demagnetization and screening, the content of elemental iron in steel slag is 0.5-2%;

[0041] 2) Take 100 parts of steel slag after step 1) demagnetization and screening, and put 80 parts of water in a wet drum type ball mill for ball milling to obtain fluid slurry; 1.5, the grinding ball is made of high manganese steel;

[0042] 3) Take the fluid slurry obtained in step 2) and place it in a vertical sand mill for wet grinding until the median particle size of the steel slag particles reaches 8 μm, the gradation interval of the grinding balls is 1.5-2.6 mm, and the ball-to-material ratio 1.5, the grinding ball is made of alumina;

[0043] 4) Add sodium methylene bis-naphthalene sulfonate and 0.4% sodium hexametaphosphate in an amount of 0.1% by mass fraction of steel slag to the steel slag part...

Embodiment 2

[0045] 1) After crushing the industrial solid waste steel slag to a particle size of 20 mm, then demagnetize and screen to remove the iron phase in the steel slag;

[0046] After demagnetization and screening, the content of elemental iron in steel slag is 0.5-2%;

[0047] 2) Take 100 parts of steel slag after demagnetization and screening in step 1), and put 100 parts of water in a wet roller ball mill to obtain a fluid slurry; 1.8, the material of the grinding ball is low alloy wear-resistant steel;

[0048] 3) Take the fluid slurry obtained in step 2) and place it in a vertical sand mill for wet grinding until the median particle size of the steel slag particles reaches 6 μm, the grading range of the grinding balls is 1.5-2.3 mm, and the ball-to-material ratio 1.8, the material of the grinding ball is zirconia;

[0049] 4) Add 0.3% polycarboxylate superplasticizer and 0.3% lignin sulfonate to the steel slag particles with a median particle size of 6 μm obtained in step 2)...

Embodiment 3

[0051] 1) After crushing industrial solid waste steel slag to a particle size of 25 mm, demagnetization and screening are performed to remove the iron phase in the steel slag;

[0052] After demagnetization and screening, the content of elemental iron in steel slag is 0.5-2%;

[0053] 2) Take 100 parts of steel slag after demagnetization and screening in step 1), and put 90 parts of water in a wet roller ball mill to obtain fluid slurry; 2.3, the material of the grinding ball is chromium molybdenum silicon manganese steel;

[0054] 3) Take the fluid slurry obtained in step 2) and place it in a vertical sand mill for wet grinding until the median particle size of the steel slag particles reaches 5 μm, the grading range of the grinding balls is 1.0-2.0 mm, and the ball-to-material ratio 2.2, the grinding ball is made of alloy steel;

[0055] 4) Add 0.2% polycarboxylate superplasticizer and 0.6% sucrose to the steel slag particles with a median particle size of 5 μm obtained in...

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Abstract

The invention discloses a method for preparing a micro-expansion agent for concrete from industrial solid waste steel slag. The industrial solid waste steel slag is crushed to a particle size of 10-30mm, demagnetized and sieved to remove the iron phase; water is added and ball milled in a wet roller type ball mill to obtain Fluid slurry; placed in a vertical sand mill for liquid-phase activation until the median particle size of steel slag is below 8 μm; adding anti-agglomeration agents and retarders to obtain concrete micro-expansive agents. The invention does not require pretreatment of industrial solid waste steel slag, nor does it need to be dried; it adopts wet roller type ball mill and wet vertical sand mill for superfine treatment, so that it has sufficient stress intensity and stress frequency; the slurry is placed for a long time long. The concrete micro-expansion agent prepared by the invention can replace 20-50% of the amount of cement in concrete, can be uniformly dispersed in cement concrete, has high activity, the expansion stress produced is limited, and no poor volume stability occurs. The problem.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing a concrete micro-expansion agent from industrial solid waste steel slag. Background technique [0002] Steel slag is the waste slag produced in the steelmaking process, about 1 ton of steel slag is discharged for every 3 tons of steel produced. According to the division of steelmaking process, steel slag is divided into three types: oxygen converter slag, electric arc furnace slag and ladle slag. The composition of different steel slags is different, but its main mineral composition is dicalcium silicate (C 2 S), tricalcium silicate (C 3 S), tetracalcium aluminoferrite (C 4 AF), calcium ferrite (C 2 F), calcium oxide-iron oxide-manganese oxide-magnesia solid solution (RO phase), free calcium oxide (f-CaO), free magnesium oxide (f-CaO) and elemental iron. [0003] Steel slag can be used as flocculant in sewage treatment, soil cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C04B24/18C04B24/10
CPCC04B40/0039C04B24/20C04B22/16C04B24/18C04B2103/302C04B24/10
Inventor 贺行洋郑正旗苏英王迎斌谭洪波陈威胡华超彭凯李佳伟黄中辉
Owner HUBEI UNIV OF TECH
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