CN115818989A - Method for efficiently preparing high-activity steel slag and application thereof - Google Patents
Method for efficiently preparing high-activity steel slag and application thereof Download PDFInfo
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- CN115818989A CN115818989A CN202211240225.5A CN202211240225A CN115818989A CN 115818989 A CN115818989 A CN 115818989A CN 202211240225 A CN202211240225 A CN 202211240225A CN 115818989 A CN115818989 A CN 115818989A
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Abstract
The invention discloses a method for efficiently preparing high-activity steel slag, which is characterized in that industrial waste steel slag is mechanically crushed, and the specific surface area reaches 390-570m 2 Per kg, placing the steel slag powder in 5% H 2 And 95% of N 2 And (3) carrying out heat treatment on the mixed gas at 500-900 ℃ for 10-40 minutes, wherein the gas flux is 5-15mL/min, so as to obtain the modified steel slag material. The steel slag composite excitant prepared by the invention can reasonably utilize a large amount of waste steel slag materials, improves the activity index and stability after being mixed with cement, has simple and efficient preparation method, is suitable for industrial production, and is beneficial to reducing and inhibiting the use amount of clinker and the emission of carbon dioxide.
Description
The technical field is as follows:
the invention relates to the technical field of steel slag activation, in particular to a method for efficiently preparing high-activity steel slag and application thereof.
The background art comprises the following steps:
the steel slag is waste slag generated in metallurgical industry, contains a large amount of available components such as slag steel, calcium oxide, iron, magnesium oxide and the like, and can not be processed in time, so that a large amount of steel slag occupies land and pollutes the environment, and the problems of processing and resource utilization of the steel slag are more and more emphasized.
The invention aims to reasonably utilize a large amount of waste steel slag, improve the activity and strength of the waste steel slag and improve the application value of the waste steel slag in the aspect of building materials.
The invention content is as follows:
the invention discloses a method for efficiently preparing high-activity steel slag, which is implemented by mechanically crushing industrial waste steel slag, wherein the specific surface area of the industrial waste steel slag reaches 390-570m 2 Per kg, placing the steel slag powder in 5% H 2 And 95% of N 2 And (3) carrying out heat treatment on the mixed gas at 500-900 ℃ for 10-40 minutes, wherein the gas flux is 5-15mL/min, so as to obtain the modified steel slag material.
According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
The invention has the beneficial effects that: in the high-temperature steel-making process, the over-burnt CS phase and part of inert glass phase in the steel slag are very stable and do not react with water, so that the activity index of the steel slag is low and the steel slag cannot replace cement clinker 2 The activation of the steel slag can generate a large amount of oxygen vacancies, so that a stable structure area is unstable, the hydration reaction is more violent, and the activity index of the steel slag is improved.
The specific implementation mode is as follows:
the method for efficiently preparing high-activity steel slag and the application thereof are further explained by combining with the embodiment.
Example 1:
the experimental conditions are 500 ℃, the treatment time is 10min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 2:
the experimental conditions are 600 ℃, the treatment time is 10min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Experimental example 3:
the experimental conditions are 700 ℃, the treatment time is 10min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 4:
the experimental conditions are 800 ℃, the treatment time is 10min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 5:
the experimental conditions are 600 ℃, the treatment time is 20min, and the gas flux is 10mL/min to obtain the modified steel slag material. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 6:
the experimental conditions are 600 ℃, the treatment time is 30min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 7:
the experimental conditions are 600 ℃, the treatment time is 40min, and the gas flux is 10mL/min, so that the modified steel slag material is obtained. According to the test standard of GB/T17671-1999, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed and maintained for 28 days in a water sample environment at the temperature of 25 ℃, and the compressive strength is measured.
Example 8:
the experimental conditions are 600 ℃, the treatment time is 20min, and the gas flux is 5mL/min to obtain the modified steel slag material. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Example 9:
the experimental conditions are 600 ℃, the treatment time is 20min, and the gas flux is 15mL/min, so that the modified steel slag material is obtained. According to the GB/T17671-1999 test standard, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed, and the mixture is cured for 28 days in a water sample environment at the temperature of 25 ℃ to test the compressive strength.
Comparative example 1:
30 percent of common steel slag material and 70 percent of common Portland cement are mixed, and the mixture is maintained for 28 days in a water sample environment at 25 ℃ to measure the compressive strength.
Comparative example 2:
standard cement
TABLE 1 examination results of all examples and comparative examples (data in the tables compressive strength is compared with standard cement)
Table 1 shows the compressive strengths of the samples of examples 1 to 9 and comparative examples 1 to 2. As can be seen from Table 1, according to the test results of the examples and the comparative examples, when the temperature is 600 ℃ and the gas flux is 10mL/min, the compressive strength of the sample obtained by treating for 20min is the highest, and the promotion effect of the gas on the activity of the steel slag is more obvious.
The principle of the invention is as follows: in the high-temperature steel-making process, the over-sintered CS phase and part of inert glass phase in the steel slag are very stable and do not react with water, so that the activity index of the steel slag is low and the steel slag cannot replace cement clinker. Through the activation of partial small molecular H2, a large amount of oxygen vacancies can be generated in the steel slag, the stable structure area is unstable, the hydration reaction is more violent, and the activity index of the steel slag is improved.
The above description is only a preferred embodiment of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work shall fall within the scope of the present invention.
Claims (2)
1. The method for efficiently preparing the high-activity steel slag is characterized in that the industrial waste steel slag is mechanically crushed, and the specific surface area reaches 390-570m 2 Per kg, placing the steel slag powder in 5% H 2 And 95% of N 2 And (3) carrying out heat treatment on the mixed gas at 500-900 ℃ for 10-40 minutes, wherein the gas flux is 5-15mL/min, so as to obtain the modified steel slag material.
2. The use of a high-activity steel slag according to claim 1, wherein: according to the test standard of GB/T17671-1999, 30 percent of modified steel slag material and 70 percent of ordinary portland cement are mixed and maintained for 28 days in a water sample environment at the temperature of 25 ℃, and the compressive strength is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211240225.5A CN115818989A (en) | 2022-10-11 | 2022-10-11 | Method for efficiently preparing high-activity steel slag and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211240225.5A CN115818989A (en) | 2022-10-11 | 2022-10-11 | Method for efficiently preparing high-activity steel slag and application thereof |
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| CN115818989A true CN115818989A (en) | 2023-03-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4545797A (en) * | 1983-06-13 | 1985-10-08 | Texaco Inc. | Process for manufacturing porous slag |
| FR2610616A1 (en) * | 1987-02-11 | 1988-08-12 | Mendelsohn Natie | Processes and materials for improving the qualities of silico-calcic slags |
| CN101724727A (en) * | 2009-09-28 | 2010-06-09 | 莱芜钢铁集团有限公司 | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources |
| CN105110660A (en) * | 2015-08-19 | 2015-12-02 | 韶关学院 | Method for reducing, quenching and tempering molten steel slags in reducing atmosphere |
| CN110396563A (en) * | 2019-08-26 | 2019-11-01 | 苏州大学 | Steel slag recovery method |
-
2022
- 2022-10-11 CN CN202211240225.5A patent/CN115818989A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4545797A (en) * | 1983-06-13 | 1985-10-08 | Texaco Inc. | Process for manufacturing porous slag |
| FR2610616A1 (en) * | 1987-02-11 | 1988-08-12 | Mendelsohn Natie | Processes and materials for improving the qualities of silico-calcic slags |
| CN101724727A (en) * | 2009-09-28 | 2010-06-09 | 莱芜钢铁集团有限公司 | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources |
| CN105110660A (en) * | 2015-08-19 | 2015-12-02 | 韶关学院 | Method for reducing, quenching and tempering molten steel slags in reducing atmosphere |
| CN110396563A (en) * | 2019-08-26 | 2019-11-01 | 苏州大学 | Steel slag recovery method |
Non-Patent Citations (1)
| Title |
|---|
| 李心林;刘旭隆;李园超;李秋菊;洪新;: "中低温碳氢还原-磁选不锈钢渣的实验研究", 过程工程学报, no. 01 * |
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