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Steel slag stability modifier and steel slag stability processing method

A treatment method and a stable technology, applied in the direction of recycling technology, etc., can solve the problems of poor utilization effect, achieve the effect of simple treatment method, low cost, and reduce the content of free calcium oxide

Inactive Publication Date: 2008-12-24
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel slag is the largest solid waste caused by metallurgical pollution. WISCO alone has hundreds of thousands of tons of it every year. The actual utilization effect is very poor, and stability is the key

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composition range of steel slag stability modifier is (mass percent, %): SiO 2 : 97.5, Al 2 o 3 : 1.86, CaO: 0.05, and the rest is water. The introduction is river sand powder containing quartz (natural river sand mineral grinding), less than 80 mesh. Add the above-mentioned steel slag stability modifier into the steel slag tank according to the ratio of 10kg of modifier and 90kg of steel slag for modification treatment, so as to obtain steel slag materials with qualified stability. The stability of steel slag can be improved by the impact force of liquid steel slag. The quality agent is evenly dispersed and reacts with the slag; part of the viscous slag can be stirred by blowing oxygen with a blow gun. The treated steel slag is used in cement production: 30g of modified steel slag added with 10% river sand powder, 70g of No. 325 Portland cement, the strength of the clean slurry test block is 16.78MPa in 3 days, and 26.35MPa in 7 days , 28-day strength of 47.81M...

Embodiment 2

[0014] The composition range of steel slag stability modifier is (mass percent, %): SiO 2 : 33.50, Al 2 o 3 : 15.50, CaO: 37.50, MgO: 9.50, and the rest are impurities and moisture. The introduced material is blast furnace slag (WISCO No. 7 blast furnace blast furnace slag), and the particle size is less than 1mm. The steel slag stability modifier is added to the steel slag pot according to the ratio of 15kg of modifier and 85kg of steel slag for modification treatment, and the steel slag is treated at a temperature between 1610°C and 1750°C. In order to obtain a steel slag material with qualified stability, the steel slag stability modifier can be evenly dispersed and reacted with the slag through the impact force of the liquid steel slag; part of the viscous slag can be stirred by blowing oxygen with a blow gun. According to the ratio of 30g of modified steel slag added with 15% blast furnace slag and 70g of No. 325 Portland cement, the strength of the clean slurry test b...

Embodiment 3

[0016] The composition range of steel slag stability modifier is (mass percent, %): SiO 2 : 36.70, Al 2 o 3 : 14.82, CaO: 35.63, MgO: 9.02, and the rest are impurities and moisture. The modifier introduced is (mass percentage, %) blast furnace slag (WISCO No. 7 blast furnace blast furnace slag) 95, river sand 5; they are mixed together and ground into a fine powder of less than 80 mesh. Add the above-mentioned steel slag stability modifier into the steel slag tank according to the ratio of 20kg of modifier and 80kg of steel slag for modification treatment, so as to obtain steel slag materials with qualified stability. The stability of steel slag can be improved by the impact force of liquid steel slag. The quality agent is evenly dispersed and reacts with the slag; part of the viscous slag can be stirred by blowing oxygen with a blow gun. According to the ratio of 30g of modified steel slag added with 20% blast furnace slag and 70g of No. 325 portland cement, the strength o...

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Abstract

The invention discloses a steel slag stability modifier and a method for treating the stability of steel slag. The method comprises the following steps that: the steel slag modifier is added into a steelmaking slag tank according to a proportion of between 0.5 and 50 percent of the total steel slag amount for carrying out modification treatment; the steel slag stability modifier comprises the following compositions in percentage by weight that: 30 to 99.88 percent of SiO2, 0.001 to 40 percent of Al2O3, 0.001 to 40 percent of CaO and 0.001 to 20 percent of MgO; and the introduced substances of the compositions can be one of blast furnace slag, quartz sand and riversand or a mixture of a plurality of kinds of the blast furnace slag, quartz sand and riversand. The steel slag stability modifier has wide material source and low cost; the method for treating the stability of steel slag is simple, safe, reliable and easy to operate. The method directly adopts the steel slag stability modifier with low cost after the steel slag is treated in a converter, properly carries out injection treatment in order to change the stability of the steel slag, thereby effectively reducing a content of free calcium oxide in the steel slag and enlarging a safe use range of the steel slag.

Description

technical field [0001] The invention belongs to the treatment technology of steel slag in the metallurgical industry, and in particular relates to a steel slag stability modification technology. Background technique [0002] With the development of the national circular economy, it is required to realize the reuse of waste resources in the metallurgical industry, especially the reuse of metallurgical slag and waste gas has become the focus of circular economy in the metallurgical industry. The most critical factor for the comprehensive utilization of steel slag is the stability of steel slag. There are many reasons for affecting the stability, among which the hydration and decomposition of free calcium oxide is the main reason. The free calcium oxide in the steel slag has been calcined at a high temperature of about 1700°C. It has a dense structure, coarse crystal particles, and an extremely slow hydration rate. hydration. At the same time, a certain amount of FeO, MgO and...

Claims

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Application Information

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IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 徐国涛袁凡成王悦张洪雷陈华圣刘黎
Owner WUHAN IRON & STEEL (GROUP) CORP
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