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A kind of highly active iron and steel slag powder and its preparation method

A steel slag powder, high activity technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of complex composition of slag steel slag composite fine powder, low composite powder activity, low product activity, etc. Achieve the effect of improving later strength and corrosion resistance, solving poor stability and improving compactness

Inactive Publication Date: 2018-01-19
ENGRO CORPORATION
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AI Technical Summary

Problems solved by technology

Patent No. 201010152505.1 discloses a preparation method of modified S95 grade slag powder. The modified slag powder prepared by the invention consists of 50-85% S95 slag powder, 10-40% ultra-fine steel slag powder and 3-15% semi Composition of water gypsum, the material composition does not meet the relevant regulations in GB / T28293-2012 "Steel Slag Powder", and the specific surface area of ​​the ultra-fine steel slag powder used must be ground to 600m 2 / kg, because the grindability of steel slag is far less than that of slag, grinding steel slag into ultra-fine powder will consume a lot of energy and increase production costs, which is neither environmentally friendly nor economical
Patent No. 201210254966.9 discloses a composite micropowder of slag and steel slag, which is mainly composed of slag, tailing steel slag, glass material and solid active activator. In addition, the content of steel slag is only 10-20%. The activity of the composite powder is not high, and it can only reach the S75 level in GB / T180462008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete". It is also difficult to control the stability
Patent No. 201110057462.3 and Patent No. 201210017077.0 respectively disclose a steel slag composite powder and its preparation method, and steel slag composite micropowder and its preparation method. Relevant regulations in Iron and Steel Slag Powder, and the product activity is low
In short, the current patents on steel slag composite powder do not meet the requirements of GB / T 28293-2012 "Steel Slag Powder" on the performance of steel slag powder products and the composition of raw materials. Related patents and technical reports of a high-activity steel slag composite powder and its preparation method that meet the requirements of the national standard GB / T 28293-2012 "Steel Slag Powder"

Method used

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  • A kind of highly active iron and steel slag powder and its preparation method
  • A kind of highly active iron and steel slag powder and its preparation method
  • A kind of highly active iron and steel slag powder and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: take prepared sample 100g as 100% meter:

[0030] A. Take 63g of S95 grade slag powder, the density is 2.87g / cm 3 , the specific surface area is 438m 2 / kg;

[0031]B. Grinding steel slag, and introducing active modifier with a total weight of 0.2g of material by spraying while grinding steel slag, after the grinding is completed, take 30g of finely ground steel slag powder, with a density of 3.45g / cm 3 , with a specific surface area of ​​484m 2 / kg, free calcium oxide content 4.87%;

[0032] C. Take 7g of superfine slag powder with a density of 2.85g / cm 3 , the specific surface area is 852g / cm 3 .

[0033] Put the above three components into the mixer for high-efficiency mixing to obtain G95 steel slag powder. According to the national standard GB / T 28293-2012 "Steel Slag Powder", the strength and activity index of the steel slag powder are tested. The comparison cement is Portland cement produced by Taiwan United Company, the 7d compressive stren...

Embodiment 2

[0035] Embodiment 2: take prepared sample 100g as 100% meter:

[0036] A. Take 67g of S95 grade slag powder with a density of 2.87g / cm 3 , the specific surface area is 438m 2 / kg;

[0037] B. Grinding steel slag, and evenly dripping active modifier with a total weight of 0.2g of the substance while grinding steel slag, after the grinding is completed, take 30g of fine steel slag powder, with a density of 3.45g / cm 3 , with a specific surface area of ​​484m 2 / kg, free calcium oxide content 4.87%;

[0038] C. Take 3g of superfine slag powder with a density of 2.85g / cm 3 , the specific surface area is 852g / cm 3 .

[0039] Put the above three components into the mixer for high-efficiency mixing to obtain G95 steel slag powder. According to the national standard GB / T 28293-2012 "Steel Slag Powder", the strength and activity index of the steel slag powder are tested. The comparison cement is Portland cement produced by Taiwan United Company, the 7d compressive strength is 39...

Embodiment 3

[0042] Embodiment 3: take prepared sample 100g as 100% meter:

[0043] A. Take 71.2g of S95 grade slag powder with a density of 2.87g / cm 3 , the specific surface area is 438m 2 / kg;

[0044] B. Grinding steel slag, and adopting the mode of spraying to introduce the active modifier of material gross weight 0.15g while steel slag grinding, after grinding, take ground fine steel slag powder 25g, density is 3.45g / cm 3 , with a specific surface area of ​​484m 2 / kg, free calcium oxide content 4.87%;

[0045] C. Take 3.8g of superfine slag powder with a density of 2.85g / cm 3 , the specific surface area is 852g / cm 3 .

[0046] Put the above three components into the mixer for high-efficiency mixing to obtain G95 steel slag powder. According to the national standard GB / T 28293-2012 "Steel Slag Powder", the strength and activity index of the steel slag powder are tested. The comparison cement is Portland cement produced by Taiwan United Company, the 7d compressive strength is 3...

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Abstract

The invention discloses high-activity iron and steel slag powder, which comprises the following components, by weight part: 63-75 of S95-level slag powder, 20-30 of finely-ground steel slag powder, 3-8 of ultrafine slag powder, and a certain amount of an activity modifier. The invention also discloses a preparation method of the high-activity iron and steel slag powder. The preparation method includes steps of: milling steel slag while adding the activity modifier to prepare the finely-ground steel slag powder; performing water quenching of blast furnace slag, and milling the obtained slag to obtain the ultrafine slag powder; and uniformly mixing the finely-ground steel slag powder, the ultrafine slag powder, and S95-level slag powder to prepare the high-activity iron and steel slag powder satisfying the national standard GB / T28293-2012 "iron and steel slag powder". The high-activity iron and steel slag powder can be used in concrete in order to reduce the cement content and enhance the erosion resistance of concrete. The preparation method is suitable for massive processing of iron and steel slag produced from an iron and steel industry.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste and environmental protection engineering, and relates to a technology for producing a green building material using steel waste slag as a raw material, in particular to a technology for producing highly active steel slag powder by using steel waste slag. Background technique [0002] As early as 2006, my country promulgated the national standard GB / T 20491-2006 "Steel Slag Powder Used in Cement and Concrete". It is easy to cause expansion cracking of cement products or concrete. The existence of these poor stability problems greatly restricts the resource utilization of steel slag powder. How to solve the above problems is one of the main subjects studied by those skilled in the art. [0003] Those skilled in the research field found that steel slag powder and slag powder have synergistic and complementary effects, which can fundamentally solve the problem of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/147C04B18/14C04B18/12
CPCY02P40/10Y02W30/91
Inventor 陈恩义汪爱萍黄海卢斯文
Owner ENGRO CORPORATION