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Steel slag property optimized handling method

A treatment method and steel slag technology, which is applied in the field of steel slag performance optimization, can solve the problems of low effective active component content, large fluctuation of steel slag composition, and restricted application, so as to reduce the cost, improve the volume stability and hydraulic activity, The effect of reducing costs and resource consumption

Inactive Publication Date: 2008-05-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current engineering application of research results in this field is obviously low. The fundamental reason is that the content of effective active components in steel slag is relatively small, the activity is low, and the content of free calcium oxide and free magnesium oxide is high (the free calcium oxide of general steel slag is 3-6%, free magnesium oxide is 4-11%), and the fluctuation of steel slag composition is large, which seriously restricts its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Based on the original steel slag, add components to the original steel slag to adjust the raw materials limestone (4.47% as CaO), clay (4.47% as SiO 2 Calculated as 2.19%) and bauxite (as Al 2 o 3 Calculated as 1.86%), mixed and ground together to a specific surface area of ​​325m 2 / Kg. The steel slag added with component adjustment raw materials was calcined in a silicon-molybdenum rod furnace at 1600°C, and the firing temperature was 1300°C. After the calcination is completed, the optimized steel slag is obtained through air cooling at the slag outlet, rapid cooling, granulation, and grinding.

[0022] After the above optimized treatment, the f-CaO content of the steel slag is about 1.2%, the pressure steaming stability is qualified, and the 28-day activity index is about 89.6%.

[0023] The XRD analysis diagrams of the steel slag before and after optimization are shown in Figure 1. The upper figure is the optimized XRD analysis chart, and the lower figure is the...

Embodiment 2

[0028] Add components to the original steel slag to adjust the raw materials limestone (6.82% as CaO), clay (6.82% as SiO 2 Calculated as 1.52%) and bauxite (as Al 2 o 3 Calculated as 2.11%), mixed and ground together to a specific surface area of ​​336m 2 / Kg. The steel slag added with component adjustment raw materials was calcined in a silicon-molybdenum rod furnace at 1600°C, and the firing temperature was 1300°C. After the calcination is completed, the optimized steel slag is obtained through water cooling at the slag outlet, rapid cooling, granulation, and grinding.

[0029] After the above optimized treatment, the f-CaO content of the steel slag is about 1.8%, the pressure steaming stability is qualified, and the 28-day activity index is about 87.6%.

Embodiment 3

[0031] Add components to the original steel slag to adjust the raw materials limestone (2.27% as CaO), clay (2.27% as SiO 2 Calculated as 4.28%) and bauxite (as Al 2 O 3 Calculated as 1.20%), mixed and ground together to a specific surface area of ​​336m 2 / Kg. The steel slag added with component adjustment raw materials was calcined in a silicon-molybdenum rod furnace at 1600°C, and the firing temperature was 1300°C. After the calcination is completed, the optimized steel slag is obtained through air cooling at the slag outlet, rapid cooling, granulation, and grinding.

[0032] After the above optimized treatment, the f-CaO content of the steel slag is about 1.0%, the pressure steaming stability is qualified, and the 28-day activity index is about 85.2%.

[0033] Compared with the original steel slag, the optimized steel slag prepared in the above-mentioned embodiments 1, 2 and 3 has a performance comparison in Table 1:

[0034] Table 1 Comparison of main physical proper...

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Abstract

The invention relates to a steel slag performance optimization treatment method. The following steps are adopted: a certain amount of steel slag is fetched, which is added with 2-10 percent of the weight of the steel slag of calcareous materials (counting in CaO), 1-5 percent of siliceous materials (counting in SiO2) and 1-4 percent of aluminum materials (counting in Al2O3); the slag and the materials are mixed and grinded into fine powders for the calcinations with the sintering temperature of 1200-1550 degree Celsius; after the calcinations, the fast granulation and the grinding are implemented at a slag outlet port through the wind cooling or the water cooling; the optimized steel slag is obtained. The invention has the beneficial effects of optimizing the mineral composition of the steel slag essentially, improving the volume stability of the steel slag and the water hardening activity, effectively utilizing the steel slag as resources, lowering the costs of cement, concrete and other related products and the resource consumption and being beneficial to the environmental protection.

Description

(1) Technical field [0001] The invention belongs to the technical field of comprehensive utilization of steel slag, and relates to a steel slag performance optimization treatment method for performing component modulation and performance optimization treatment on the steel slag. (2) Background technology [0002] Steel slag is the slag discharged during the production of steelmaking. In 2006, my country's steel output was about 360 million tons, and the annual steel slag was nearly 60 million tons. The cumulative stock of steel slag in the country reached more than 300 million tons. A large amount of steel slag is discarded and piled up, which not only pollutes the environment but also occupies a large amount of land. At the same time, it causes a waste of resources and affects the sustainable development of the iron and steel industry, which needs to be solved urgently. Therefore, it is necessary to carry out research on the reduction, recycling and high-value comprehensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/06
CPCC04B5/06
Inventor 程新周宗辉刘福田芦令超常钧黄世峰叶正茂
Owner UNIV OF JINAN
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