The main factors affecting ore crushing are ore properties, equipment performance and operating conditions.
1. The nature of the ore
The harder the ore, the greater its compressive strength, the more difficult it is to crush, and the lower the productivity. On the contrary, the productivity is high; if there are more lumps in the ore, a large amount of crushing is required, and the productivity is low. Otherwise, the productivity is high; When the water and mud content are large, it is easy to stick and block the crushing cavity, which has a great impact on the productivity, and even makes the crushing process impossible in severe cases; when crushing the ore with a large proportion, the productivity is high, otherwise the productivity is low; The production rate of the ore must be much higher than that of the ore with a compact structure.
2. Crushing equipment
The type, specification, stroke, engagement angle, and size of the discharge port of the crushing equipment have a great influence on the productivity of the crusher. The larger the size of similar crushers, the higher the productivity; the smaller the engagement angle of the crusher (the angle between the two crushing working faces), the larger the discharge port, the smaller the crushing ratio, the easier the ore can pass, and the higher the productivity. Higher. Conversely, the larger the angle of engagement, the smaller the discharge port, the larger the crushing ratio, and the more difficult it is for the ore to pass, and the lower the productivity. If the biting angle is too large, when crushing the ore, the ore will jump up and cannot be broken, and a complete accident may even occur. If the engagement angle is too small, the crushing ratio is too small to meet the requirements of the process. Therefore, the biting angle of the crushing mechanism should be appropriate. The working engagement angle of jaw crusher is generally 15-25 degrees, gyratory crusher is 21-23 degrees, cone crusher is about 18 degrees, and roller type is about 30 degrees. All the engagement angles should not be greater than 34 degrees. For a certain type and specification of a crusher, both the crushing ratio and the productivity must be considered when working. Both must be considered. One-sided pursuit is wrong on the one hand.
3. Operating conditions
Continuous and even feeding is a prerequisite for the normal operation of the crusher. Closed-circuit crushing is adopted, a large amount of cyclic load is added to the feed, so that the feed size is relatively fine, and the cyclic load plus crushing can become a qualified intermediate product. Therefore, the crusher should be at a large crushing ratio and high load factor when working in a closed circuit. Under the circumstances of working, the production capacity has been improved. Depending on the hardness of the ore, the production capacity during closed-circuit crushing is increased by approximately 15-40%. The so-called load factor is the percentage of the ratio of the actual production capacity of the crusher to the calculated production capacity. The size of the load factor is an important indicator of the full potential of the crusher.
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