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Steel slag activation method

An activation method, steel slag technology, applied in the field of steel slag activation, can solve the problems of low strength, long coagulation time, low hydration activity, etc., and achieve the effect of meeting the requirements of flexural resistance and strength improvement

Inactive Publication Date: 2013-03-06
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the silicon content in steel slag is only about 9%, which is much less than that in cement (20% to 30%), its hydration activity is low, and the building materials made of it not only have a long setting time, but also have high strength. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get hot stuffy steel slag raw material and process according to the activation method of the present invention:

[0016] (1) Soak the hot stuffy steel slag raw material in a mixed solution of sodium silicate and sodium aluminate for 15 days, the content of sodium silicate in the mixed solution of sodium silicate and sodium aluminate is 80%, and the content of sodium aluminate is 20%;

[0017] (2) naturally air-dry the steel slag after soaking for 48 hours;

[0018] (3) heating the naturally air-dried steel slag to 800°C, and then keeping it warm for 4 hours;

[0019] (4) Cool the steel slag to room temperature under natural conditions, and then perform grinding (traditional ball milling) until the fineness reaches a specific surface area greater than 450M 2 / Kg to obtain activated steel slag powder.

[0020] Take 225 grams of activated steel slag powder, 225 grams of PO42.5 cement, 225 grams of water, and 1350 grams of standard sand to make a 40x40x160mm test piece, a...

Embodiment 2

[0025] Get hot stuffy steel slag raw material and process according to the activation method of the present invention:

[0026] (1) Soak the hot stuffy steel slag raw material in the mixed solution of sodium silicate and sodium aluminate for 15 days, the sodium silicate content in the mixed solution of sodium silicate and sodium aluminate is 50%, and the sodium aluminate content is 50%;

[0027] (2) naturally air-dry the steel slag after soaking for 48 hours;

[0028] (3) heating the naturally air-dried steel slag to 800°C, and then keeping it warm for 4 hours;

[0029] (4) Cool the steel slag to room temperature under natural conditions, and then perform grinding (traditional ball milling) until the fineness reaches a specific surface area greater than 450M 2 / Kg to obtain activated steel slag powder.

[0030] Take 225 grams of activated steel slag powder, 225 grams of PO42.5 cement, 225 grams of water, and 1350 grams of standard sand to make a 40x40x160mm test piece, and t...

Embodiment 3

[0035] Get hot stuffy steel slag raw material and process according to the activation method of the present invention:

[0036] (1) Soak the hot stuffy steel slag raw material in a mixed solution of sodium silicate and sodium aluminate for 15 days, the content of sodium silicate in the mixed solution of sodium silicate and sodium aluminate is 90%, and the content of sodium aluminate is 10%;

[0037] (2) naturally air-dry the steel slag after soaking for 48 hours;

[0038] (3) heating the naturally air-dried steel slag to 800°C, and then keeping it warm for 4 hours;

[0039] (4) Cool the steel slag to room temperature under natural conditions, and then perform grinding (traditional ball milling) until the fineness reaches a specific surface area greater than 450M 2 / Kg to obtain activated steel slag powder.

[0040] Take 225 grams of activated steel slag powder, 225 grams of PO42.5 cement, 225 grams of water, and 1350 grams of standard sand to make a 40x40x160mm test piece, a...

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Abstract

The invention provides a steel slag activation method comprising the following steps: hot disintegration steel slag is soaked for 15 days in a mixed solution of 50 to 90 % sodium silicate and 10 to 50 % sodium aluminate, the soaked steel slag is naturally dried for 48 hours, and the naturally dried steel slag is heated to 800 DEG C and is then insulated for 4 hours; and under the natural condition, the steel slag is cooled to the room temperature, then the steel slag is ground fine until the specific surface of the steel slag reaches above 450 M<2> / Kg, and activated steel slag micro powder is obtained. The activity index of steel slag obtained through the method can be improved by about 50 %, and the strength of gelled material produced by steel slag obtained through the method can be more than doubled.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for activating steel slag. Background technique [0002] Steel slag is the molten slag discharged from the steelmaking process. Steel slag is mainly the oxides formed after the oxidation of each element in the metal charge, the eroded furnace lining and repairing materials, the impurities brought in by the metal charge, and the slag-forming materials specially added to adjust the properties of steel slag, such as limestone and dolomite , iron ore, silica, etc. The main mineral composition of steel slag is tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodoxene, dicalcium ferrite, RO (R represents oxides of magnesium, iron and manganese, namely FeO, MgO, Solid solution formed by MnO), free lime (fCaO), etc. [0003] The metallurgical industry of various countries in the world will discharge about 130KG of steel slag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/00
Inventor 孙家瑛
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG