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Method for enhancing early strength of steel slag cement

A technology of early strength and steel slag, applied in cement production and other directions, can solve the problem that the early strength of steel slag cement cannot be further improved, and achieve the effects of saving resource consumption, low production cost and simple process

Inactive Publication Date: 2012-07-11
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent does not carry out further treatment of steel slag, so that the early strength of steel slag cement cannot be further improved

Method used

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  • Method for enhancing early strength of steel slag cement
  • Method for enhancing early strength of steel slag cement
  • Method for enhancing early strength of steel slag cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: (the specific surface involved in the embodiment is the result that utilizes Burr's specific surface area measuring instrument to measure)

[0029] After the steel slag is dried to a moisture content of less than 1wt%, it is separately ground into several steel slag powders with different specific surface areas, and then used as a desulfurizer to absorb sulfur in the sulfur-containing flue gas, and the sulfur trioxide content in the desulfurized steel slag At 2wt% to 15wt%, several different desulfurized steel slags were obtained, and then dried until the moisture content was less than 1wt%, and then ground into desulfurized steel slag powders with specific surface areas shown in the table below, and the sulfur trioxide content was measured. See Table 1, spare.

[0030] Table 1. Specific surface area of ​​steel slag and sulfur trioxide content after desulfurization

[0031] Numbering

G5

G6

G7

G8

Specific surface ar...

Embodiment 2

[0041] Add water to the steel slag and grind it separately to form a steel slag slurry with a moisture content of 40wt%-50wt% (the specific surface area is 325.6m3 after sampling and drying. 2 / kg), and then used as a desulfurizer to absorb the sulfur in the sulfur-containing flue gas to obtain desulfurized steel slag with a sulfur trioxide content of less than 13wt%, and then dried at a high temperature to become desulfurized steel slag with a moisture content of less than 2.0wt%. The final specific surface area is 423.1m 2 / kg of desulfurized steel slag powder, the actual measurement of its sulfur trioxide content is 12.5wt%, for subsequent use.

[0042] Grind the dried slag with a moisture content less than 1wt% separately to several slag powders with different specific surface areas for use; grind the dried steel slag separately to a specific surface area of ​​339.4m 2 / kg steel slag powder, spare.

[0043] Then, mix desulfurized steel slag powder, slag powder, and steel...

Embodiment 3

[0050] Add water to the steel slag and grind it separately to form a steel slag slurry with a water content of 50wt%-60wt% (the specific surface area is 325.6m3 after sampling and drying. 2 / kg), and then used as a desulfurizer to absorb sulfur in sulfur-containing flue gas to obtain desulfurized steel slag with a sulfur trioxide content of less than 13wt%. After being dried to a moisture content of less than 2.5wt%, it is ground to obtain a specific surface area of ​​402.5m 2 / kg of desulfurized steel slag powder, the actual measurement of its sulfur trioxide content is 12.5wt%, for subsequent use.

[0051] Separately grind the dried slag to a specific surface area of ​​420.2m 2 / kg slag powder, for use; grind the dried steel slag separately to several steel slag powders with different specific surface areas, for use.

[0052] Then, mix desulfurized steel slag powder, slag powder and steel slag powder uniformly according to the ratio in Table 4 to prepare steel slag cement ...

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Abstract

The invention relates to a method for enhancing the early strength of steel slag cement. The method for enhancing the early strength of steel slag cement is characterized in that the method includes the following steps: (1) preparation of desulfurized steel slag: steel slag is dried and then ground into steel slag powder alone, or is directly added with water and ground into steel slag slurry alone, the steel slag powder or the steel slag slurry is then used as desulfurizing agent to absorb the sulfur in sulfureous flue gas, and is dried, and thereby the dried desulfurized steel slag is obtained; (2) preparation of steel slag cement: in percentage by weight, materials include 15 to 66 percent of dried desulfurized steel slag, 20 to 70 percent of slag, 0 to 60 percent of clinker, 0 to 7.2 percent of gypsum and 0 to 25 percent of cement mixture, wherein the percentages of the clinker, the gypsum and the cement mixture are not zero at the same time, and the materials are ground, so that the steel slag cement is prepared. The process of the method is simple, the production cost is low, the earth strength of the steel slag cement can be increased, moreover, steel slag can be promoted to replace limestone or lime to serve as desulfurizing agent for desulfurizing flue gas, and thereby the consumption of the limestone or lime resource is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for improving the early strength of steel slag cement. Background technique [0002] Steel slag is the waste slag produced in the steelmaking process. The amount is about 15% to 20% of the steel output. It is the second largest metallurgical waste slag after the blast furnace slag. The current utilization rate is only about 10%, and it cannot be used effectively. In addition to being used to backfill the foundation of a small number of projects every year, most of them are abandoned around the steel plant. Over the past few decades, it has piled up into mountains, some stretching for more than 10 kilometers, not only encroaching on a large number of fertile land, but also causing secondary pollution to air and water quality, seriously damaging the environment, and bringing ecological disasters to surrounding areas. [0003] At present, flue gas de...

Claims

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Application Information

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IPC IPC(8): C04B7/147
CPCY02P40/10
Inventor 林宗寿刘金军赵前李大志
Owner WUHAN UNIV OF TECH
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