As we know, for the processing of non-metallic minerals, one is to remove impurities and improve the purity of the product; In the process of reducing the particle size of the product, the choice of stone grinding machine is very important, which directly affects the mineral utilization rate, production cost, product quality and economic benefits.
Non-metallic mineral stone grinding machine for sale
Faced with so many grinding equipments on the market, non-metal mining companies generally need to consider the following aspects when selecting:
1.Raw material hardness
The hardness of raw materials is the basis of equipment selection, and it involves investment in equipment mainframe, auxiliary machinery, infrastructure investment, operating costs and many other aspects.
If Raymond mill is used to process ultra-fine quartz powder, a pressurized (hydraulic or mechanical) system is required to apply sufficient pressure to pulverize. The increase in pressure increases the manufacturing and operating costs of the equipment, especially the reliability of the grinding rollers and discs. The performance is greatly reduced, the failure rate of the pressurized system is increased, and the equipment downtime and maintenance costs increase sharply.
2. Product fineness and particle shape
Product particle size and its distribution and product particle shape are one of the most basic and important indicators in the industrial application of non-metallic mineral products. Product fineness and particle size distribution depend on the classification equipment, and the particle shape and the grinding method are inseparable.
If the raw material is a non-metallic mineral with a medium hardness or lower, such as talc, marble, kaolin, bentonite, feldspar, etc., the product fineness requirement is about 104-38 μm (150-400 mesh), you can choose Raymond mill, vortex mill , Vertical mill, hammer mill, rotary mill, vibration mill, ball mill, roller (press) mill, etc. In general, there is no need to set an additional air centrifuge classifier.
If the fineness of the product is to be less than 38μm (400 mesh or more), in addition to choosing a fine-grained milling equipment, such as Raymond mill, vertical mill, vibration mill, ball mill, rotary mill, etc., also choose an air centrifugal type. The classifier is matched with the mill, otherwise it is difficult to meet the requirements of product fineness and grading.
When selecting a classifier, in addition to considering product fineness, classification efficiency and energy consumption per unit of product, it is necessary to match the mill in terms of processing capacity and air consumption.
For some non-metallic minerals, such as graphite, talc, kaolin, wollastonite, etc. Maintaining the flaky or needle-like particle shape helps to improve its application performance and use value. Therefore, when selecting the milling process equipment for these minerals, the particle shape must also be considered.
For example: if the ultrafine powder product requires the shape of a polygon, the grinding operation should be avoided as much as possible, and the equipment that produces the appropriate extrusion and impact can be selected, and it is better to be crushed in multiple stages.
It is impossible to process ultrafine powders with high sphericity by high-speed impact method, because the particles with high sphericity need grinding processing method.
What equipment is used to control the fineness and grain shape, whether it is through a one-stage mill or a multi-stage mill, and the reasonable setting of the crushing ratio for each break, etc., have greatly affected the size of the total investment.
3. Product purity
Many downstream applications have certain requirements for non-metallic mineral powder products such as iron oxide, titanium oxide and other metal oxides, as well as whiteness indicators. Therefore, processing impurities is the biggest taboo and difficulty in non-metallic mineral processing, and it is also difficult in the total investment. solved problem.
In the selection of the mill and classifier, the wear and material of the equipment must be considered. If necessary, strict isolation measures must be taken at all parts where the equipment is in contact with the material. Isolation methods, equipment, isolation materials used, and their costs are not a small number and need to be carefully considered.
4. Product variety and output
When possible, it is best to use a process production (process) line. This requires comparison of alternative milling equipment that can achieve product fineness. Based on the comparison, a single large equipment that can meet the output requirements is selected. . Because in general, fewer production lines are more convenient to manage. Compared with multiple small devices, a single large device has lower energy consumption per unit product and lower production costs.
In addition, if there are many types of products, and it is not possible to use one device for alternate crushing processing at the same time, it is also necessary to consider selecting multiple (set) process equipment.
5.Unit energy consumption
Energy consumption is an important part of product cost. Regarding energy consumption and equipment selection, you can consider the product quality of non-metal ore ultrafine powder and the utilization rate of minerals.
There are three factors involved:
Mineral properties and crushing ratio
Crushing method and ratio
Breaking method and energy utilization.
6. Operating costs
Operating costs are also often overlooked by investors. According to the system composition and working principle of the equipment, the actual situation of wearing parts, consumable materials and moving parts should be understood in detail, such as: reliability, life, cost, maintenance time, replacement method, degree of automation, knowledge requirements of operators, etc. To determine the choice of equipment and calculate the investment cost.
For example, the nozzle components and clean air supply in the airflow main machine are specially listed and calculated, and the one-time use of clean air sources adds a lot of operating costs.
7. Infrastructure investment
The capital construction cost mainly includes the basic characteristics of the equipment, such as the material characteristics of the excavation foundation, the construction and management of the bearing foundation, the occupied area, the height and span of the plant, the building materials, and so on. For example: the origin of the jet mill is supplied by the compressor of the special equipment, and its basic requirements are relatively high in cost. These should make investors think carefully.
To deal with the problem of ultra-fine grinding of non-metallic minerals in actual production, we should try to study and adopt a reasonably optimized process. The optimized process should propose and determine the performance requirements of mechanical equipment. Equipment required by the process. This customized non-standard equipment can get the best product performance and economic benefits. Although the investment cost has increased slightly, the total benefit is far beyond the result of equipment selection.
Taking a step back, for the equipment that the manufacturer has finalized, it should propose a transformation requirement that meets its own requirements, and it is not necessary to easily change the process requirements to adapt to the performance of the already finalized equipment. According to the process optimization parameters, it is the best choice for manufacturers to provide complete sets of equipment. In this way, the optimal working state and the benefits of high-quality products can be obtained. This should be adhered to first.