Slag is a by-product in the process of blast furnace ironmaking. During the formation of slag, iron oxide is reduced to metallic iron at high temperature. Impurities such as silicon dioxide and aluminum oxide in iron ore react with lime to form molten products with silicate and aluminosilicate as the main components, it has high potential activity and hydraulic properties.
Therefore, after the slag is ground into mineral powder, it can be directly mixed into cement and concrete in a certain proportion, which is the choice of many cement and commercial concrete enterprises to improve product performance and reduce costs.
As for the question whether vertical mill or ball mill is a good choice for slag grinding, vertical mill is widely used in the industry at present. Let's take a look at this:
Comparison between vertical mill and ball mill:
First of all, from the perspective of floor area, the vertical mill is a vertical structure, integrating crushing, drying, grinding and graded conveying, with compact layout and small floor area; The ball mill is of horizontal structure, which is not complete, loosely connected and covers a large area. The floor area of the vertical mill is about 50% of that of the ball mill system, which can greatly reduce the site construction cost in the early stage.
Secondly, the vertical mill directly rolls and grinds the materials on the grinding plate through the grinding roller, which has low energy consumption. Compared with the ball milling system, it can save about 30% ~ 40% of the energy consumption.
Thirdly, from the material point of view, the important parts of SMMVIK Machinery vertical mill are made of high-quality steel and high-performance wear-resistant materials, so the wearing parts have long service time and high efficiency; The ball mill lining plate and steel ball have large loss, high replacement frequency and high operation cost in the later stage.
Finally, from the aspect of environmental protection, the vertical mill operates under the negative pressure system, and is equipped with pulse dust collector, noise reducer and other environmental protection measures. The dust emission concentration can be controlled at 20mg/m3, which is in line with the national environmental protection regulations; However, the ball mill is noisy during operation, which has a great impact on the surrounding environment.
