Comparison Between Vertical Roller Mill And Ball Mill In Dry Grinding Steel Slag Equipment

Using the mechanical grinding method of dry grinding steel slag equipment to grind steel slag into micro powder and apply it to the production of building materials is an effective way for the resource reuse of steel slag. After the steel slag is finely ground to fine powder by dry method, the crystal structure of the steel slag is destroyed by mechanical force, and the surface and potential activity are partially released. It solves the problem of stability, provides a new application way for the application of steel slag, and can realize the pollution-free application of steel slag. This paper mainly shares the comparison of steel slag processing by dry steel slag vertical roller mill and ball milling equipment.

HLM vertical roller mill for steel slag powder made by HCM

Dry grinding steel slag equipment roller press + ball mill combined grinding system

The power consumption of ball mill alone is relatively high. Some scholars in the industry put forward the theory of "more breaking and less grinding", and use the mature roller press technology to support the ball mill combined grinding system. It can reduce the power consumption of grinding to a certain extent. The advantages and disadvantages of this process are summarized as follows:

The rolling machine gives full play to the high efficiency of crushing and coarse grinding stage, combined with the excellent grinding performance of ball mill, and realizes system stability and product stability on the basis of ensuring system energy consumption.

Steel slag and industrial waste slag are usually highly abrasive, the maintenance cycle cost of roller surface of roller press is lower than that of ball milling, and the structure is conducive to the external setting of University iron remover to remove the metal in the crushed materials in time.

The rolling machine is only a crushing equipment, and the drying and powder selection are outside, which requires many conveying links and a large building. Therefore, the process system is complex and the civil engineering investment is relatively high.

Vertical grinding system of dry grinding steel slag equipment

Steel slag vertical roller mill is a system with high efficiency. Because its grinding power consumption is low, and it integrates drying, grinding and powder selection, the process flow is simple. It is widely used in the preparation of cement raw meal and pulverized coal, and soon has been widely popularized in the field of slag grinding. When the vertical roller mill is used to produce ultra-fine mineral powder and the specific surface area of the finished product reaches more than 420 m2 / kg, the power consumption of the grinding system can be less than 45 kwh / T. Compared with the rod press + ball mill system, the vertical roller mill grinding system has the following characteristics:

(1) The vertical roller mill grinding system has relatively few equipment and relatively simple process flow. The core equipment, namely the vertical roller mill itself, integrates drying, grinding and powder selection. There is less external circulation of materials, less power consumption for material transportation, and large air volume for the system, which is very suitable for the grinding of high wet and viscous materials. Such as wet discharged fly ash, clay, etc.

(2) The vertical grinding mill process adopts the material bed grinding mill equipment, which can greatly reduce the power consumption of the system. Compared with the ball milling process, it has the advantages of high grinding efficiency, low energy consumption and simple system.

At present, vertical roller mill has been widely used in slag grinding process. Because the particle size composition of water quenched steel slag is similar to that of slag, vertical roller mill is also a good choice for steel slag grinding. However, due to the high iron content of steel slag and poor grindability, the requirement of product particle size is high. Therefore, when grinding with vertical roller mill, the wear is large, and the particles with high iron content are easy to accumulate at the grinding disc, which can not be eliminated in time, so it is difficult to form a stable material layer. In order to stabilize the thickness of the material layer of the grinding disc of the vertical roller mill and avoid large vibration, measures are often taken to reduce the feeding amount or lift the rod to discharge the material. In this way, the vertical roller mill is difficult to operate continuously and stably, which greatly affects the output and stability of steel slag grinding.

At present, a very small number of vertical roller mills in China are used for dry grinding steel slag, with poor stability. The application effect of imported vertical roller mills introduced by some steel mills is also more general. The large vertical roller mill of HCMilling(Guilin Hongcheng) is in an advanced position in China and has developed more than ten specifications and models. It is used for grinding cement raw materials, cement, slag and many kinds of coal. According to the properties and grinding characteristics of steel slag, the steel slag grinding test is carried out by using the vertical grinding test-bed. Considering the requirements of users for grinding slag, HLM steel slag vertical roller mill is developed.

The basic parameters are shown in the figure above. If you need to know more detailed parameters of dry grinding steel slag equipment, please contact mkt@hcmilling.com or call at +86-773-3568321, HCM will tailor for you the most suitable grinding mill program based on your needs, more details please check www.hcmilling.com.