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How To Grind Steel Slag Powder With High Specific Surface Area? Can Steel Slag Vertical Roller Mill Produce Ultra-fine Steel Slag Powder?


Release date: 2023-01-17 14:05:48

The annual emission of steel slag exceeds 100 million tons. If it is effectively utilized, it will greatly alleviate the current situation of raw material shortage and high prices in the building materials industry. Ultra-fine steel slag is an important way to improve the performance of steel slag, which has always been the direction of exploration. However, most of them have problems of low output and high energy consumption, and have not realized large-scale production for many years. How to grind steel slag powder with high specific surface area? Can steel slag vertical roller mill produce ultra-fine steel slag powder? As a manufacturer of steel slag ultra-fine vertical roller mill, HCMilling(Guilin Hongcheng) will give you specific analysis and answer below.

 

steel slag vertical roller mill

The specific surface area of common steel slag powder is about 400-450, and the specific surface area of steel slag 700 belongs to high specific surface steel slag powder. So, what are the advantages of steel slag 700 over superfine powder?

1. Significantly improved activity: after the steel slag powder has passed the ultra-fine test, the activity can be increased by about 20% compared with the 28-day activity of ordinary steel slag powder 80, and the 28-day activity can reach more than 100 according to GB/T 20491-2017 Steel Slag Powder for Cement and Concrete.

 

2. No increase in water demand: due to the filling and dispersion of ultra-fine steel slag powder, the porosity of the cementitious system is greatly reduced, so the water demand of the system does not increase with the increase of the specific surface area. The fluidity of ultra-fine steel slag powder is more than 100%, and the water demand ratio is less than 95%.

 

3. Significantly improve the stability: compared with ordinary steel slag powder, the free calcium oxide in high specific surface ultra-fine steel slag powder is more evenly distributed, fully exposed, and fully reacted in the early stage, greatly improving the poor stability of steel slag.

 

4. High economic benefits: after the steel slag powder and a certain proportion of S95 mineral powder are combined and superfine, the composite mineral admixture with better performance than S95 mineral powder can be obtained. The performance of the composite powder reaches or exceeds the performance of 95 mineral powder, and the proportion of mineral powder is not more than 50%. Take Tongling, Anhui Province as an example: the local S95 slag delivery price is 200 yuan/ton, and the steel slag tail slag delivery price is 50 yuan/ton. Steel slag tailings and S95 mineral powder are produced by steel slag fine powder vertical roller mill at a ratio of 5:5. The sales price of ultra-fine composite powder is 350 yuan/ton according to the local average price of S95 mineral powder. The processing cost of steel slag fine powder vertical roller mill is calculated as 55 yuan/ton. Cost calculation: raw material cost=200×0.5+50×0.5=125 yuan/ton; Processing cost=55 yuan/ton; Production cost=125+55=180 yuan/ton. Benefit calculation: profit=350-180=170 yuan/ton (the above data source network is for reference only)

 

How to grind steel slag powder with high specific surface area? Can steel slag vertical roller mill produce ultra-fine steel slag powder? The traditional technical route is that the ultra-fine steel slag powder adopts the combined grinding method. The steel slag tail slag is ground to a specific surface area of about 300m2/kg by the steel slag vertical roller mill or roller press, and then the steel slag powder enters the ultra-fine ball mill for ultra-fine grinding mill, and the final specific surface area reaches more than 700m2/kg. The disadvantage of this technical route is that the steel slag powder produced by the traditional steel slag vertical roller mill and roller press has a large particle size, which can not independently complete the production of high specific surface steel slag powder. It needs to add ultra-fine ball mill for secondary grinding, which not only has complex process flow, but also covers a large area of equipment, high energy consumption, and increases the production cost of high specific surface steel slag powder. HLMX series steel slag micro-powder vertical roller mill produced by HCMilling(Guilin Hongcheng) can solve this problem. The steel slag micro-powder produced by HLMX steel slag micro-powder vertical roller mill model can directly produce the particle size of 700 specific meters of steel slag without ball milling, saving the equipment space and energy consumption, and greatly reducing the investment cost. Therefore, what are the applications of steel slag 700 scale?

1. After being processed by steel slag grinding mill, it can be used in ordinary Portland cement: it can completely replace S95 mineral powder or directly add 10% - 20% in finished cement, and the strength of cement will not be reduced in 3d and 28d. Generally, the cement production cost can be reduced by more than 10 yuan/ton.

 

2. Application in ordinary concrete after processing with steel slag grinding mill: taking C30 concrete as an example, this product can completely replace S95 mineral powder or replace 40-80kg cement in the same amount. The strength of concrete 7d and 28d will not be reduced, and the production cost of concrete will be reduced by more than 10 yuan/m3.

 

3. Application in high-strength and high-performance concrete after being processed by steel slag grinding mill: at present, the main way to achieve high strength is to increase the amount of cement, resulting in high viscosity, rapid loss and large early shrinkage of concrete. Adding composite superfine powder can minimize the amount of cement, improve the workability of concrete, improve the later strength of concrete, reduce the release rate of hydration heat and hydration heat, reduce the risk of shrinkage cracking, and improve the corrosion resistance and harmful ion corrosion resistance of concrete.

 

4. Application in prefabricated concrete products after processing with steel slag grinding machine: composite superfine powder is mainly customized for different production processes of high-performance concrete for prefabricated components. When producing PC components, segments, sleepers, track plates and other prefabricated components, adding composite ultra-fine powder can reduce the amount of cement, reduce the risk of temperature difference cracks, improve the pore structure of concrete, improve the early strength of concrete, reduce steam curing time, and improve production efficiency.

 

It can be seen from the above that the production of steel slag 700 superfine powder has greatly improved the application value of steel slag powder, with good economic benefits and broad market prospects. As a manufacturer of steel slag micro-powder vertical roller mill, HCMilling(HCMilling(Guilin Hongcheng)) has a great advantage in the production of steel slag micro-powder with high specific surface. If you have a project demand for the production of high specific surface steel slag powder, please contact us for details of steel slag grinding mill and equipment.