The most important material in the desulfurization project is limestone powder (generally required fineness is: 90% pass of 325 mesh or 95% pass of 250 mesh), and the preparation of limestone powder is generally divided into vertical mill powder and ball mill powder. Since the desulfurization problem has become particularly prominent in recent years, the pulverizing process used is also the key to the success or failure of the desulfurization project. It is recommended to use the HLM type desulfurization stone powder vertical mill pulverizing process.
HLM desulfurization stone powder vertical mill is a high-efficiency and energy-saving drying and grinding equipment developed by Guilin Hongcheng grinding mill manufacturer on the basis of extensively absorbing foreign advanced technology and summarizing domestic and foreign vertical mill application experience. It integrates fine crushing and drying, grinding, powder selection and transportation. It has high grinding efficiency, low power consumption, large drying capacity, easy adjustment of product fineness, simple process flow, small floor space, low noise, and no It has the advantages of low dust pollution, low wear, convenient maintenance and reliable operation.
Advantages of desulfurization stone powder vertical mill
1. High grinding efficiency
The desulfurization stone powder vertical mill uses the material layer grinding principle to grind materials, which has low energy consumption. The power consumption of the grinding system is 20% to 30% lower than that of the ball mill, and as the moisture content of the raw material increases, the power saving effect becomes more significant.
2. Large drying capacity
The desulfurization stone powder vertical mill uses hot air to transport materials. When grinding materials with large moisture content, the inlet air temperature can be controlled to ensure that the product reaches the required final moisture. In the vertical mill, materials with a moisture content of up to 15% can be dried.
3. The chemical composition of the product is stable
The uniform particle gradation helps the calcined material stay in the vertical mill for only 2 to 3 minutes, while it takes 15 to 20 minutes in the ball mill. Therefore, the chemical composition and fineness of desulfurization stone powder vertical mill products can be quickly measured and calibrated.
4. Simple process flow, small floor space and small footprint
The desulfurization stone powder vertical mill itself has a powder separator, and there is no need to add a powder separator and lifting equipment. The dusty gas coming out of the mill can be directly collected by a high-concentration bag dust collector or an electric precipitator, so the process is simple and the layout is compact. Can be arranged outdoors. The building area is about 70% of the ball mill system, and the building space is about 50%~60% of the ball mill system.
5. Low noise, less dust, and clean operating environment
When the desulfurization stone powder vertical mill is working, the grinding roller and the grinding disc are not in direct contact, and there is no metal impact sound of the steel balls colliding with each other and the steel balls hitting the lining plate in the ball mill. Therefore, the noise is small, 20 to 25 decibels lower than the ball mill. In addition, the desulfurization stone powder vertical mill adopts a fully sealed system. The system operates under negative pressure, with no dust and a clean environment.
6. The grinding body has little wear and high utilization rate
Since there is no direct contact between metals during the operation of the desulfurization stone powder vertical mill, the wear of the grinding body is small, and the wear per unit product is generally 5~10g/l.
Comparison of desulfurization stone powder vertical mill and ball mill process plans
The desulfurization stone powder vertical mill process flow is a "first-level dust collection system". It has the advantages of simple process flow, less system equipment, few system failure points, convenient system operation, flexible process layout, and no wear on the main fan impeller of the system. However, it requires a high-concentration dust collector, which requires a relatively large investment.
The process flow of ball milling is a "two-stage dust collection system". It has the characteristics of complex process flow, many system equipments, many system failure points, difficult system operation, many process layout limiting factors, and large floor space. Although there is no need to configure a high-concentration dust collector, the relative investment is relatively large. When enterprises carry out new construction, expansion or technological transformation, the technical solutions they adopt mainly consider economic and social benefits. Factors such as investment size, loan repayment period, operating and maintenance costs, environmental protection, operating worker rationing, operational safety and ease of maintenance and repair.
Taking the limestone powder preparation system with an annual output of 300,000 tons as an example, the relevant indicators of the two solutions using desulfurized stone powder vertical mill and ball mill are compared. The investment in a center-driven mid-discharge drying and grinding system is nearly 50% higher than that in a vertical grinding system, but the technical and economic indicators are lower than those of the desulfurization stone powder vertical grinding system. Especially in terms of power consumption per unit product, the desulfurization stone powder vertical mill system is 20% lower than the central drive drying mill and grinding system.
It can be seen that the desulfurization stone powder vertical mill is far superior to the ball mill grinding system in both technical and economic indicators. Although the price of the desulfurization stone powder vertical mill is higher than that of the ball mill, the desulfurization stone powder vertical mill system is only about 50% of the ball mill system. In terms of other technical indicators, the desulfurization stone powder vertical mill is also much more advanced. If you are interested in choosing desulfurization stone powder vertical mill as your choice for limestone powder making, please leave us a message to learn more about the equipment details.