rock crushing contractors south africa

Project Background

Which kind of crusher is suitable for any situation, the following is a detailed introduction: When the rock particle size is between 125mm and 1020mm

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Rock crusher classification

Which kind of crusher is suitable for any situation, the following is a detailed introduction: When the rock particle size is between 125mm and 1020mm, it can be coarsely crushed by the jaw crusher, and the rock particle size is coarsely crushed. When the feed particle size is small, the impact crusher can be used. The feed size of the impact crusher is between 100-500mm. The biggest advantage is that the discharge port can be automatically adjusted, which can be automatically adjusted according to user needs; hammer crushing The machine is generally used to crush materials such as coal and lime. The cone crusher has large crushing ratio, high efficiency, low energy consumption and uniform product size. It is suitable for medium and fine crushed ores and rocks. The impact crusher has low energy consumption, high output and large crushing ratio. It has a shaping function, a cubic shape, and a high bulk density. It is suitable for fine crushing and mechanism sand.

Four methods and equipment for crushing and breaking rocks

After mining, the demand for crushing stone production equipment and sand production line equipment is huge. Whether it is engineering construction or mineral processing, it can be said that complete equipment such as crusher and fine crusher is essential. However, before mining, blasting and crushing of large ore and rock must be carried out. This is a special operation combining theory, technology and experience. Therefore, we will introduce the technical methods of rock fragmentation in order to understand.

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Rock crushing is the process and theory of removing part of the rock mass from the parent body and breaking it into rock mass in mining operation. There are four kinds of explosion crushing, mechanical crushing, water jet crushing and thermal crushing. The main task of studying rock fragmentation is to reveal the relationship between energy consumption and fracture effect of broken rock, explore the relationship between crushing load and rock robustness and fracture parameters, and develop safe, economical and efficient mining tools and equipment to seek new crushing. method. There are usually four methods of crushing rock breakage.

The first type, the explosion is broken, and the huge energy that is instantaneously released by explosives or other explosives is used to break the rock.

The second type is mechanical crushing, sub-cutting, punching, rolling, and grinding. When the rock breaks, the rock-breaking tool sander enters the rock, and a dense core appears in the rock body in front of the tool. A large block of collapse is produced around the dense core. The main reason why mechanical crushing is not widely used in hard rock is the serious wear of tools. The degree of wear depends mainly on the content of hard minerals in the rock and the particle size.

Third, the water jet is broken, divided into low pressure and large flow and high pressure and small flow. The former pressure does not exceed 2 × 107Pa, and is mostly used for hydraulic mining or coal mining. The latter can be used for cutting rocks with pressures of several hundred million Pascals or more. In addition, pulsed jet technology has been developed to effectively break up solid rock without requiring a lot of power. The current high instantaneous pressure has reached 5.6GPa. The high-pressure water jet breaks the rock with high energy consumption and complicated mechanical structure. At present, it is used as an auxiliary means for the rock-breaking machine and the open-end cone drilling machine to break the rock.

The fourth type, thermal crushing, forms a high temperature gradient in the rock body, and uses the different thermal expansion coefficients of the rock components to form thermal stress, causing the rock mass to peel off or crisp. Rocks with more quartz have better effect using this method. Modern heating methods include aluminothermic, flame spray, plasma flame, microwave, infrared radiation, high energy electron beam, powerful breakdown current, laser, and the like. But except for the flame spray method (fire drill), everything else is in the experimental stage.

In order to select a reasonable method of rock fragmentation, the rock is graded according to the degree of difficulty in breaking. The grading indicators include Platts robustness factor f, drillability, explosiveness, intrusion hardness and rock drilling specific work. Since the 1950s, the Platts firmness factor f has been widely used as a grading indicator in Chinese mines. A more sophisticated grading method is being studied in recent years.

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