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Steel-scoria and mine-scoria cement by using steel-scoria ball milled waste mud and its production method

A technology for steel slag tailings and slag cement, applied in the field of building materials, can solve the problems that steel slag cement is difficult to be widely recognized and affects the volume stability of steel slag cement.

Inactive Publication Date: 2009-09-30
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high free calcium oxide and magnesium oxide contained in steel slag, which affects the volume stability of steel slag cement, it is difficult for steel slag cement to be widely recognized by the market.

Method used

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  • Steel-scoria and mine-scoria cement by using steel-scoria ball milled waste mud and its production method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0010] 2. Preparation method of steel slag tailings slag cement

[0011] The preparation method of steel slag tailings slag cement of the present invention, the steps are as follows:

[0012] (1) Use the steam produced by waste heat boilers in iron and steel enterprises as a heat source to heat-treat wet steel slag tailings at a temperature of 100°C-120°C, keep the water content of steel slag tailings below 4%, and break large pieces of gypsum to below 10mm ; Send the crushed steel slag tailings into the ball mill for grinding until the Blaine specific surface area is 450-470m 2 / kg;

[0013] (2) Grind silicate clinker, blast furnace slag and natural gypsum to Blaine specific surface area of ​​450-470m 2 / kg;

[0014] (3) The steel slag tailings processed in step (1) and the silicate clinker, blast furnace slag and natural gypsum processed in step (2) are dosed according to the following weight ratio: 20% to 40% of steel slag tailings, blast furnace slag 35% to 45%, silica...

specific Embodiment approach

[0020] The present invention will be further described below in conjunction with the examples, but not limited thereto.

[0021] The steel slag tailings used in the examples are the sludge produced by the converter steelmaking steel slag after wet ball mill grinding, water washing and iron selection, the silicate clinker is 525# ordinary Portland cement clinker, and the blast furnace slag is Blast furnace slag treated by granulation and water quenching, natural gypsum is ordinary natural dihydrate gypsum. The chemical composition of each raw material is shown in Table 1.

[0022] Table 1 raw material chemical composition table (mass percentage %)

[0023] raw material

Embodiment 1

[0024] Embodiment 1: steel slag tailings slag cement and preparation method thereof, the steps are as follows:

[0025] (1) Use the steam produced by the waste heat boiler of the iron and steel enterprise as a heat source to heat-treat the wet steel slag tailings at a temperature of 105°C, so that the water content of the steel slag tailings is about 3%, and the large pieces of gypsum are broken to below 10mm; The final steel slag tailings are sent to a ball mill for grinding until the Blaine specific surface area is 460m 2 / kg;

[0026] (2) Grind silicate clinker, blast furnace slag and natural gypsum to Blaine specific surface area of ​​460m 2 / kg;

[0027] (3) The steel slag tailings, silicate clinker, blast furnace slag and natural gypsum processed through steps (1) and (2) are proportioned according to the following weight ratio: 40% of steel slag tailings, 35% of blast furnace slag, silicate 20% of clinker and 5% of natural gypsum are mixed in a mixer. Product proper...

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Abstract

The invention relates to a steel slag tailings slag cement and a production method for applying steel slag ball mill tailings to steel slag slag cement. First, the steel slag ball mill tailings with high water content are heat-treated for drying and dehydration, so that the water content of the steel slag tailings is reduced to Within 4%, the crushed steel slag tailings are sent to a ball mill for grinding, then mixed with silicate clinker, blast furnace slag and natural gypsum in proportion, and mixed in a mixer to produce steel slag of different grades Slag cement. The invention efficiently utilizes the solid waste of iron and steel enterprises, turns waste into wealth, has simple production process, and significantly reduces cement production cost.

Description

technical field [0001] The invention relates to a method for producing steel slag slag cement by using steel slag ball mill tailings and the cement produced by the method, belonging to the field of building materials. Background technique [0002] Steel slag is a by-product produced in the steelmaking process of iron and steel enterprises, most of which are converter steel slags. At present, most of the converter steel slags of major domestic steel companies still adopt extensive wet treatment methods, that is, red hot steel slag is pumped with water. After quenching and cracking into block slag, the slag field is crushed, magnetically separated and screened. When the iron content (TFe content is about 20%) of the tailing slag after magnetic separation is high, except for a small part, it is used for the production of steel slag powder preparation Apart from cement, most of the tailings are used for road construction and landfill, which not only wastes resources but also pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/147C04B7/21
CPCC04B7/153Y02P40/10C04B7/19C04B7/21
Inventor 刘智伟孙庆亮李志峰许倩王玮种振宇孙业新董晓春管山吉江丹刘永恒
Owner LAIWU IRON & STEEL GRP
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