Road steel slag pretreatment method

A pretreatment, steel slag technology, applied in the direction of solid waste removal, etc., can solve the problems of few free calcium oxide content, reducing free calcium oxide content, unfavorable large-scale application of steel slag, etc., to shorten the aging time, accelerate water Chemical reaction, not easy to decompose

Inactive Publication Date: 2019-04-16
葛洲坝武汉道路材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are not many methods to reduce the content of free calcium oxide in steel slag and the effect is not obvious
There are two main methods. One is to add oxygen and quartz sand to the high-temperature liquid steel slag, which can melt and chemically crystallize free calcium oxide, thereby reducing the content of free calcium oxide. The other is aging, which is naturally The time required for aging is relatively long, which is not conducive to the large-scale application of steel slag. Accelerated aging is to accelerate the hydration reaction of free calcium oxide through steam aging or steam pressure aging, but the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for pretreatment of road steel slag, said method comprising the following steps:

[0020] (1) Solution preparation: mix 100 parts of water, 3 parts of industrial acetic acid, 0.5 part of calcium dihydrogen phosphate, 10 parts of calcium chloride, and 3 parts of sodium pyrophosphate in parts by weight to prepare a solution.

[0021] (2) Continuously spray the steel slag from three different steel mills with the prepared solution at room temperature to keep the surface of the steel slag in a wet state for 30 days. The spray volume is 50 liters of mixed solution per ton of steel slag.

[0022] (3) Refer to GB / T 176-2008 Determination of free calcium oxide in the chemical analysis method of cement - ethylene glycol method to determine the content of free calcium oxide before and after three types of steel slag pretreatment. The comparison test results are shown in Table 1.

[0023] Table 1 Test results

[0024] Free calcium oxide content (%)

Embodiment 2

[0026] A method for pretreatment of road steel slag, said method comprising the following steps:

[0027] (1) Solution preparation: Mix 100 parts of water, 6 parts of industrial acetic acid, 1 part of calcium dihydrogen phosphate, 20 parts of calcium chloride, and 4.5 parts of sodium pyrophosphate to prepare a solution by weight.

[0028] (2) Continuously spray the steel slag from three different steel mills with the prepared solution at room temperature to keep the surface of the steel slag in a wet state for 60 days. The spray volume is 30 liters of mixed solution per ton of steel slag.

[0029] (3) Refer to GB / T 176-2008 Determination of free calcium oxide in the chemical analysis method of cement - ethylene glycol method to measure the content of free calcium oxide before and after pretreatment of three types of steel slag. The comparison results are shown in Table 2 below.

[0030] Table 2 Test results

[0031] Free calcium oxide content (%)

Embodiment 3

[0033] A method for pretreatment of road steel slag, said method comprising the following steps:

[0034] (1) Solution preparation: 100 parts by weight of water, 10 parts of industrial acetic acid, 2 parts of calcium dihydrogen phosphate, 30 parts of calcium chloride, and 6 parts of sodium pyrophosphate were mixed evenly to prepare a solution.

[0035] (2) Continuously spray the steel slag from three different steel plants with the prepared solution at room temperature to keep the surface of the steel slag in a wet state for 90 days. The spray volume is 40k liters of mixed solution per ton of steel slag.

[0036] (3) Refer to GB / T 176-2008 Determination of free calcium oxide in the chemical analysis method of cement - ethylene glycol method to measure the content of free calcium oxide before and after pretreatment of three types of steel slag. The comparison results are shown in Table 3 below.

[0037] Table 3 Test results

[0038] Free calcium oxide content (%)

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PUM

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Abstract

The invention discloses a road steel slag pretreatment method. Waste steel slag generated in a steelmaking process in a steel mill is intensively stacked after being treated through processes such ascrushing and iron separation, and a solution obtained by mixing a plurality of materials at a normal temperature is used for carrying out continuous spraying treatment on the intensively stacked steelslag. The solution comprises materials including, by weight part, 100 parts of water, 6-10 parts of industrial acetic acid, 0.5-2 parts of monocalcium phosphate, 10-30 parts of calcium chloride and 3-6 parts of sodium pyrophosphate, after the materials are mixed to be uniform, 30-90 days of spraying treatment is carried out on the stacked steel slag at the normal temperature, and the content of free calcium oxide in the steel slag can be obviously reduced. The content of the free calcium oxide of the treated steel slag is lower than 3%, and the steel slag can be used for building and maintaining of high-grade roads.

Description

technical field [0001] The invention relates to a method for pretreatment of steel slag for roads. Specifically, a mixed solution is used to continuously spray the steel slag to reduce the content of free calcium oxide in the steel slag and improve the utilization rate of the steel slag in road engineering. Background technique [0002] Steel slag is solid waste discharged during the steelmaking process. With the continuous production of steel slag, a large amount of steel slag has been piled up like a mountain for a long time, which will not only occupy a large area of ​​land, but also cause varying degrees of pollution to the surrounding environment. The use of steel slag in road construction is an effective way to use steel slag on a large scale. However, due to the large differences in the composition of steel slag, different steel mills have different treatment processes for steel slag, and the steel slag from many steel mills cannot meet the requirements for road use. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 聂珊崔培强王凯田孝武刘飞蔡悟阳欧阳奕波
Owner 葛洲坝武汉道路材料有限公司
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