The early 1970s, China's first reported by Maanshan Institute of Mining Research IT room the United States, Canada and other countries in magnetic iron ore dressing plant using a fine sieve successful experience, and this "beat with a hammer sieve" named " Smash the fine screen." This quickly caused widespread attention in the mineral processing industry in China. Soon, Angang Dagushan Concentrator (hereinafter referred to as Dagushan Concentrator), North Mine Institute and Anshan Iron and Steel Research Institute jointly developed nylon smashing vibrating screen in the mid-1970s, and first in Dagushan Concentrator As a result, the magnetic separation iron concentrate grade is significantly improved and good results are obtained. Subsequently, this kind of vibrating fine screen was quickly promoted and used in more than 20 magnetite ore dressing plants in China, making China's magnetically selected iron concentrates in the late 1970s and early 1980s to catch up with the world's advanced level. , has achieved great economic and social benefits.
However, due to the low efficiency of the vibrating fine screen and the large circulation on the screen, the grinding efficiency is reduced and the energy is wasted, which prompts the Chinese mineral processing technicians to develop a more advanced new fine screen. Since the late 1970s and early 1980s, China has developed a variety of different types of fine screens, and its application range has been expanded, not only to replace the new fine screens used to vibrate fine screens, but also to replace them. a grinding and classification circuit fine sieve spiral classifier; not only a fine sieve for metal ore dressing plant, but also for a variety of coal mining and non-metallic minerals processing plant and light industry, chemical industry and other fine sieve. In recent years, Tangshan Lukai Technology Co., Ltd. (hereinafter referred to as Tangshan Lukai) has developed and produced MVS-type electromagnetic vibration high-frequency vibration mesh screen, which has a good use effect and is being promoted and applied continuously. Northeastern University has successfully developed a two-way semi-helical multi-layer multi-feed vibrating fine screen. Derrick Company of the United States produces an advanced superimposed high-frequency fine screen, which is briefly introduced here.
Judging from the current situation, the existing fine screens in China can be roughly divided into the following types:
(1) Smash the fine sieve. The nylon slamming vibrating screen has a simple structure, is convenient to use, and is easy to maintain. However, due to shortcomings such as low screening efficiency, it is currently being phased out, so it will not be described in detail here.
(2) Straight line vibrating fine screen. There are mainly ZKBX linear vibrating fine screens developed and produced by the Anshan Mine. They are mainly used in the metal ore dressing plant to replace the spiral classifier with low classification efficiency in the primary grinding and classification loop. Practice shows that the classification efficiency can be increased by 10%~20%. The grinding efficiency is increased by about 20%. South Mine and Saddle Heavy also produce similar linear vibrating fine screens.
(3) High-frequency vibration fine screen. At present, there are many types of such fine screens, and their structural differences are also large, but all have the following common features, that is, high frequency, small amplitude vibration mode. The effect of this vibration mode is: 1 to break the tension on the surface of the slurry and the adhesion of the fine particles to the coarse particles, to reduce the agglomeration force between the fine particles due to molecular attraction and electrostatic attraction, which is beneficial to the material. Loose and stratified, which promotes separation and permeable screening of materials smaller than the grading size; 2 due to the high-speed oscillation of the material on the sieve surface, accelerates the separation of the useful ore particles smaller than the grading particle size, especially the density, and increases them. The probability of screen contact and sifting speeds up the screening speed; 3 reduces and prevents clogging of the screen holes and improves the screening efficiency.
The main high-frequency vibrating fine screens are: DGS type high-frequency vibrating fine screen developed by 1 Dagushan Concentrator; 2 GPS-900-3 high-frequency fine screen developed by Changsha Mining and Metallurgy Institute; 3 Northeastern University and Shen GYX-type high-frequency vibrating fine screen developed by Guangzhou Metallurgical Research Institute (hereinafter referred to as Guangzhou Nonferrous Metals Institute); the first four are mainly used in the grinding and grading circuit of the concentrator In order to replace the vibrating fine screen, hydrocyclone or spiral classifier, the screening efficiency is about 70%.
In addition, there is a cone-type high-frequency vibrating fine screen developed by Northeastern University (only laboratory tests have been carried out), and a low frequency 4ZGS1020 type high-frequency vibrating fine screen manufactured by the saddle mine.
(4) Electromagnetic vibration high frequency vibration mesh screen. This is a new type of high-efficiency and energy-saving fine screen developed and produced by Tangshan Lukai. It is mainly used as a grading equipment for the concentrating plant. It can replace the vibrating fine screen and spiral classifier, and is also suitable for dry and wet grading of various materials. Dehydration.
(5) Swirl screen. There are mainly swirling fine screens developed by the North Mine Institute, electromagnetic vibrating swirl screens designed by the Chongzhou Coal Mine Design Institute, and the latter mainly used for dewatering, desliming and grading of coarse coal slime in the coal preparation plant. Stereotypes, only industrial tests.
(6) Curved screen. There are mainly UHM-type curved screens produced by the United States, which are divided into heavy-duty curved screens for dewatering, de-intermediation and desulfurization of coal washing systems, and slurry-shaped screens for pre-de-soiling of raw coal. It has reached the quality standards of similar foreign products and has been widely used in domestic coal preparation plants. The HX-shaped curved screen manufactured by Anshan Mine is suitable for fine-grain screening, dewatering and dewatering and grading operations in the grinding circuit. The plant also produces HZ1240 curved vibrating fine screen, which is suitable for grading fine coal in coal preparation plant. Or dehydration, decoupling. Kunming Metallurgical Research Institute started the industrial test at the Wangjiatan Iron Ore Confinement Plant of Kunming Iron and Steel Co., Ltd. according to the British CTS-268 curved screen FX-1 curved screen. The screening efficiency reached over 82%.
In short, China's fine screening has entered the world first in terms of types and technical performance. In particular, the electromagnetic vibration high-frequency vibrating mesh screen developed in China has unique characteristics and has been promoted and applied in iron ore dressing plants.
A breaker is a powerful percussion hammer fitted to an excavator for demolishing hard (rock or concrete) structures. It is powered by an auxiliary hydraulic system from the excavator, which is fitted with a foot-operated valve for this purpose. Additionally, demolition crews employ the hoe ram for jobs too large for jackhammering or areas where blasting is not possible due to safety or environmental issues.
Breakers are often referred to as "hammers", "peckers", "hoe rams" or "hoe rammers". These terms are popular and commonly used amongst construction/demolition workers. The first hydraulic breaker, Hydraulikhammer HM 400, was invented in 1967 by German company Krupp (today German company Atlas Copco) in Essen.
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