Common Questions Asked When Using The Mineral Sizer To Crush Coal

Introduction

The Mineral Sizer is a highly efficient and reliable equipment for coal processing, widely used in coal mines for primary and secondary crushing. Below are some of the most commonly asked questions by users when utilizing Mineral Sizer for coal crushing.

Crushing efficiency and processing capacity

Question

Can Mineral Sizer meet the high-efficiency requirements of coal mine crushing? Comparison with traditional crushing equipment.

Solution

1. Crushing design

Mineral sizer consists of two parallel installed crushing rollers, each equipped with crushing teeth of different shapes. The shape of the teeth is selected based on the different crushing requirements of the customers, such as triangular teeth, helical teeth, tooth rings and tooth caps, etc. Triangular teeth are suitable for grasping and shearing materials. They are applicable to bituminous coal, lignite, etc. in medium-hardness coal and are widely used in primary mineral sizer to handle large pieces of materials. The helical teeth are arranged in a spiral shape along the roller shaft, forming a continuous shearing and traction effect, which is suitable for handling sticky or wet coal and preventing material adhesion and blockage. The tooth ring, with the teeth fixed on the roller in a ring or cap form, allows for the rapid replacement of individual worn teeth.

2. Screening function

The screening function of Mineral sizer mainly relies on the design of the toothed roller and the gap between the teeth. The gap between the teeth is usually adjustable and determines the size of the material passing through. Smaller materials are directly discharged through the gap between the teeth, avoiding over-crushing. Larger materials are captured by the tooth surface and crushed to achieve the required particle size.

3. Compared with traditional equipment

Crushing efficiency: Due to its unique crushing principle, mineral sizer can crush coal blocks in a relatively short time, making it particularly suitable for handling wet and sticky materials. Traditional equipment like jaw crushers has a lower crushing efficiency under the same conditions and is prone to clogging.

Processing capacity: The performance of traditional equipment often declines during high-load processing. The processing capacity of Mineral sizer is far superior to that of traditional equipment, capable of meeting the demands of high-output coal mines. Its modular design and adjustable roller spacing enable mineral sizer to maintain stable operation even under high-load conditions.

Particle size control and precision

Question

How can we ensure that the particle size of the crushed coal mine meets the requirements for subsequent processing?

Solution

1. Adjustable tooth clearance

The toothed roller clearance of Mineral Sizer can be precisely adjusted by hydraulic or mechanical devices (typically within the range of 25-300mm), ensuring that the output particle size meets the process requirements of coal washing, power generation or coking, etc. In contrast, the particle size control of traditional crushers (such as impact type) relies on the adjustment of hammer plates or impact plates, which has lower precision and is easily affected by wear.

2. Auxiliary crushing beam

The Mineral Sizer can be equipped with an adjustable crushing beam located beneath the toothed roller, which restricts the passage of large pieces of material and also participates in the crushing process to ensure uniform particle size of the output.

3. Tooth profile optimization

The tooth profile design can be customized according to the coal quality to control the crushing ratio and particle size distribution. For instance, helical teeth are suitable for uniform crushing of wet coal and reducing particle size deviation. Triangular teeth are suitable for the initial crushing of large bituminous coal, with a crushing ratio that can reach 4:1 to 6:1. Compared with traditional equipment, the particle size distribution of Mineral Sizer is narrower, reducing the subsequent screening process.

Durability and wear

Question

Different types of coal have different soft and hard properties. How durable is the equipment when using Mineral Sizer to process different types of coal mines? How to solve the problem of wear and tear?

Solution

1. Bituminous coal

Bituminous coal has a relatively high hardness and strong compressive resistance. It also contains a considerable amount of mineral impurities (such as quartz and clay). During the crushing process of mineral sizer, it is prone to cause significant wear to the toothed rollers. Therefore, crushing teeth coated with high-chromium alloy steel or hard alloy can be used, which can effectively enhance wear resistance. The pitch of the teeth can also be adjusted according to the hardness of the coal to avoid excessive contact between the material and the toothed roller.

2. Lignite

Lignite is relatively soft, has a high water content and low density, and is prone to breakage. Due to the high water content, the crushing teeth may be exposed to high moisture corrosion. Therefore, materials with good water resistance and corrosion resistance, such as stainless steel coatings, should be selected.

3. Coking coal

The hardness is relatively high, the coal quality is relatively dense, and it contains a high amount of mineral impurities. Therefore, mineral sizer can use high-hardness and impact-resistant crushing tooth materials (such as tungsten alloy or high-molybdenum steel) to effectively reduce wear. At the same time, the design of the crushing teeth should also precisely adjust the spacing and tooth shape of the tooth rollers according to the hardness of the coal to reduce the wear caused by impact.

Maintenance and upkeep

Question

How difficult and costly is the maintenance of Mineral sizer?

Solution

1. Maintenance difficulty

Our mineral sizer has replaceable tooth tips, and the tooth plates of the secondary mineral sizer can also be replaced separately. Therefore, only the severely worn parts need to be replaced, which reduces the overall replacement cost and maintenance difficulty.

2. Maintenance costs

Compared with the traditional method of replacing the entire set of toothed rollers, replacing the worn parts separately can significantly reduce material costs and labor costs.

3. Overload protection

The overload protection device can automatically disconnect or adjust when the equipment load is too large, preventing damage to the gear rollers, gear plates or other components caused by overload and reducing the risk of equipment failure.

Conclusion

Mineral Sizer has performed outstandingly in coal mine crushing. With its efficient crushing, precise particle size control, excellent durability, low energy consumption and maintenance costs, as well as high safety and environmental protection performance, it has become the preferred equipment in the coal industry. Compared with traditional crushers, it has significant advantages in handling wet and sticky materials, reducing fine powder, and optimizing operating costs.