This paper examines innovative approaches to grinding process optimization and equipment development that are transforming mineral processing operations worldwide.<\/strong><\/p>\n <\/p>\n The ore size reduction process consists of two key stages:<\/strong> broyage<\/strong> (primary size reduction) and broyage<\/strong> (final liberation). Grinding operations aim to achieve complete mineral dissociation while meeting required particle size specifications for downstream processes.<\/p>\n Operational Efficiency Considerations:<\/strong> Grinding represents a high-energy, low-efficiency operation, consuming 8-12 times more power than crushing. Process optimization can deliver significant efficiency gains with reduced energy consumption and improved economics.<\/p>\n The crushing of materials is mainly achieved by the extrusion and impact of the equipment on the minerals, and the grinding is mainly achieved by the impact and grinding of the equipment. <\/p>\n <\/p>\n Some of the original mining plants have a large design scale, but for a variety of reasons, the production scale is only about half of its original design. With the gradual reduction of mineral resources, these old factories can be improved in energy conservation and efficiency, perfecting their crushing process, ensuring their crushing granularity while achieving energy saving and efficiency.<\/p>\n In current mining production, the crushing method of mineral materials is mainly mechanical crushing<\/strong>. In order to reduce the steel consumption of crushing operations and improve the efficiency of energy utilization<\/strong>, mining workers have developed a new method of crushing, in which microwave pretreatment is a promising method of crushing.<\/p>\n The microwave is a high-frequency electromagnetic wave having a frequency of approximately 300 MHz to 300 GHz and a wavelength of 2500 px to 1 mm, penetrating the interior of a mineral to cause orientation polarization and deformation polarization of matter molecules. As the electrode changes, the direction of polarization also changes constantly, resulting in the self-heating effect of the mineral body, and the temperature rises. However, due to the different mineral properties of the ore, the absorbing properties are also different, resulting in differences in the ore. The temperature difference between each mineral in the mineral is different, and the thermal expansion coefficient of each mineral is also different. As a result, thermal cracking and the like occur, which cause microcracks in the mineral system and expand the original microcracks, thereby facilitating subsequent pulverization operations. The so-called selective grinding is the use of selective dissociation of minerals and selective grinding of the grinding; the purpose is to cause some selectivity in grinding operations. Les mat\u00e9riaux de minerai de diff\u00e9rentes tailles de particules ayant des exigences diff\u00e9rentes en mati\u00e8re de forme de broyage, les mat\u00e9riaux \u00e0 gros grains conviennent \u00e0 la m\u00e9thode de broyage bas\u00e9e sur le concassage par impact, et les mat\u00e9riaux fins doivent \u00eatre broy\u00e9s par concassage. From the feeding end to the discharge end, the pulverized form gradually changes from impact pulverization to grinding pulverization and pulverization, so that the grinding form changes along the axis direction of the ball mill, and stage grinding is realized in a ball mill. Le co\u00fbt de la technologie de broyage conventionnelle est assez \u00e9lev\u00e9. M\u00eame si la taille des particules de broyage permet de dissocier les min\u00e9raux utiles, le ph\u00e9nom\u00e8ne de surbroyage se produira et de nombreux min\u00e9raux utiles seront perdus dans la boue. Ultra-fine grinding technology<\/strong> is applied in the pretreatment of refractory gold ore. The gold is coated with pyrite. The gold ore, contained in microscopic gold, sub-microscopic gold, or solid solution, is a kind of gold that is extremely difficult to dissolve and extract from gold ore. There are many types of internal stress of the ball mill, such as impact, extrusion, shearing, grinding, etc. Some of the stress electric energy consumption is large, and the pulverizing efficiency is not high. Les high-pressure roller mill<\/a> developed based on this theory has been applied to large-scale industrial production and has achieved good economic benefits. It can significantly improve the processing capacity of equipment systems, reduce the power consumption per unit, and save infrastructure investment and simplify the process. , reduce the number of broken sections; general ore materials can be used, and the feed water content can reach 15%.<\/p>\n <\/p>\n In the past 10 years, new grinding equipment has been continuously introduced to obtain a larger crushing ratio and obtain more fine-grained crushing products to reduce the particle size of the grinding material, save energy and reduce consumption, and at the same time carry out structural innovation, adopting new technologies and new materials to improve traditional equipment to improve reliability, durability, performance, and efficiency.<\/p>\n The development of the gyratory crusher<\/strong><\/a> has a history of 100 years. Due to its large processing capacity, large ore size, and ability to handle hard ore, it is still important equipment for crushing various hard materials in large mines and other industrial sectors. With the adoption of large-scale carrying equipment, the crushing mill’s ore feeding size has reached 1.2 to 2 m, which has promoted the development of the concasseur \u00e0 m\u00e2choires<\/a> to large-scale. The spring cone crusher has been in existence for a hundred years. It was invented by the American Symons brothers using the principle of a gyratory crusher. So far, its structure has not changed much; its performance is stable, and it has a certain market share. The high-pressure roller mill, also known as the concasseur \u00e0 rouleaux<\/a>, works on the principle of material layer pulverization. It is a new type of high-efficiency energy-saving grinding equipment, which is gradually being applied and popularized at home and abroad. The mill is further developed on a large scale. Changes in the mill diameter have a significant effect on the grinding process. The large mill usually has a high specific crushing rate and can handle coarser grade materials. Since the use of self-grinding and semi-self-grinding technology in the 1950s, it has grown into a mature, reliable, and continuously applied technology. Les broyeur \u00e0 boulets<\/a> is a traditional material crushing device. It has a history of more than 100 years. It is still important equipment for fine powdering of solid materials. It is widely used in metallurgy, chemical industry, cement, ceramics, construction, electricity, and in industrial sectors such as national defense; dry and wet grinding of various ores and materials is possible. As we all know, the lining of the ball mill is a key part of the mill that can achieve high efficiency, energy saving, and consumption reduction. After research and development, it has made good progress.<\/p>\n Les broyeur \u00e0 barres<\/strong> is developed based on the ball mill. It has the advantages of reliable processing technology, low investment, less auxiliary equipment, and simple process flow. It can be combined with the ball mill to form a different grinding process.1. Crushing and Grinding Process Optimization<\/h2>\n
Strategic Approach: More Crushing and Less Grinding<\/h3>\n
\nL'efficacit\u00e9 de l'utilisation de l'\u00e9nergie de l'op\u00e9ration de concassage est beaucoup plus \u00e9lev\u00e9e que celle de l'op\u00e9ration de broyage. Plus de concassage et moins de broyage pour obtenir les meilleurs avantages \u00e9conomiques.<\/p>\n![\"crushing-grinding\"](\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2019\/10\/crushing-grinding.jpg\")
<\/a><\/p>\nImplementation Strategies<\/h3>\n
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Transform the Old Crushing Process<\/h3>\n
(1) Microwave-assisted grinding<\/h4>\n
\nAlthough microwave heating treatment has the incomparable advantages of traditional heating methods, the current theoretical research on microwave grinding is not deep enough.<\/strong> In the near future, microwave heating will play a huge role in reducing the energy consumption and steel consumption of grinding operations.<\/p>\n(2)Selective grinding<\/h4>\n
\nL'objectif principal de l'op\u00e9ration de broyage n'est pas de r\u00e9duire la taille des particules du minerai, mais de dissocier les min\u00e9raux utiles des min\u00e9raux de la gangue. Le but ultime du broyage est d'obtenir la plus grande dissociation des monom\u00e8res avec un apport d'\u00e9nergie minimal.
\nSelective grinding is widely used in mining production, such as metal ore, non-metallic minerals, and coal mines, especially in the production practice of bauxite.<\/p>\n(3)Micro-stage grinding<\/h4>\n
\nMicro-stage grinding involves installing barrel linings with different surface shapes along the axial direction of the barrel of the ball mill. The surface of the ball mill is installed with a non-smooth lining to form a high steel ball drop height, resulting in impact pulverization.
\nA smoother cylinder liner is installed at the discharge end of the ball mill to form a lower steel ball drop height, resulting in grinding and pulverization.<\/p>\n
\nCela permet de mieux r\u00e9pondre aux diff\u00e9rents besoins du minerai \u00e0 diff\u00e9rentes \u00e9tapes du processus de broyage, \u00e0 diff\u00e9rentes compositions granulom\u00e9triques, et de respecter la loi sur le broyage du minerai, am\u00e9liorant ainsi l'efficacit\u00e9 du broyage.
\nLa mise en \u0153uvre de la technologie de broyage \u00e0 micro-\u00e9tages ne n\u00e9cessite que la modification de la surface de la chemise partielle du cylindre, ce qui est simple et facile.<\/p>\n(4)Ultrafine grinding<\/h4>\n
\nApr\u00e8s plusieurs ann\u00e9es de d\u00e9veloppement continu, la technologie de broyage ultra-fin du broyeur est devenue l'une des principales technologies de traitement en profondeur des min\u00e9raux industriels et des mati\u00e8res premi\u00e8res, ce qui est d'une grande importance pour le d\u00e9veloppement des industries modernes de haute technologie.<\/p>\n
\nThe key to gold extraction is to destroy the pyrite package and expose the gold to dissociation. The pyrite is very stable and difficult to decompose. With the development of ultra-fine grinding technology, it is possible to use ultra-fine grinding to open the sulfide package to dissociate the gold.<\/p>\n(5) Pressure grinding<\/h4>\n
\nDes \u00e9tudes ont montr\u00e9 que lorsque la contrainte de compression avec une efficacit\u00e9 de pulv\u00e9risation \u00e9lev\u00e9e est s\u00e9lectionn\u00e9e comme contrainte principale, puisque le processus de pulv\u00e9risation sous pression est conforme \u00e0 la loi d'\u00e9crasement de la couche de mat\u00e9riau, lorsque la pression est faible, le mat\u00e9riau libre en vrac est d'abord suffisamment dense, et lorsque la pression augmente, les particules qui se pressent sont mutuellement La contrainte est transmise, et lorsque la valeur de r\u00e9sistance des particules est d\u00e9pass\u00e9e, les particules min\u00e9rales sont bris\u00e9es et un grand nombre de microfissures sont g\u00e9n\u00e9r\u00e9es.
\nAjuster et renforcer l'apport d'\u00e9nergie en fonction des diff\u00e9rentes caract\u00e9ristiques du mat\u00e9riau et limiter la zone d'action de la contrainte, de sorte que le mat\u00e9riau traverse r\u00e9guli\u00e8rement la zone de contrainte et que l'\u00e9nergie m\u00e9canique soit efficacement convertie en \u00e9nergie de pulv\u00e9risation, de sorte que la particule devienne un produit vierge \u00e0 faible porosit\u00e9. Le processus suivant permet d'obtenir un produit avec une taille de particule qualifi\u00e9e, ce qui permet d'atteindre l'objectif d'une production \u00e9lev\u00e9e et d'une \u00e9conomie d'\u00e9nergie.<\/p>\n2. Application and Development of Rock Crusher<\/h2>\n
Rotary Crusher<\/h3>\n
\nThe rotary crusher has a large production capacity, low unit power consumption, and stable operation. It is suitable for processing sheet materials. The crushed product has a relatively uniform particle size and can be widely used for coarse crushing and medium crushing of various hardness ores. However, compared with the jaw crusher, the structure is complicated, the price is high, the maintenance is difficult, the repair cost is high, and the capital construction cost is high.<\/p>\nConcasseur \u00e0 m\u00e2choires<\/h3>\n
\nThe compound pendulum crusher has the advantages of high efficiency and low price, and occupies a large market share of the jaw crusher. With the promotion of conservation, energy-saving and efficient production methods, several new jaw crushers have also been successfully developed.<\/p>\nConcasseur \u00e0 c\u00f4ne<\/h3>\n
\nIn order to meet today’s high-throughput production, achieve high energy, achieve higher crushing ratio and finer product granularity, the new cone crusher has also been continuously developed and applied to production practice. For example, a hydraulic cone crusher that uses hydraulic instead of a spring and an inertia cone crusher that can replace the rough grinding operation have achieved good economic benefits in production and operation.<\/p>\nRoller Crusher<\/h3>\n
\nWhen the high-pressure roller mill was originally designed and applied, it was mainly used for the crushing of limestone and brittle metal ore with less hardness, and it was used for the middle and fine crushing of crushing operations. After years of promotion and development, it has been used in fine crushing of medium hardness and above; especially in the case of iron ore crushing, its technology has become increasingly mature, and it has a large crushing ratio, fine product size, high efficiency, low energy consumption, etc. The utility model can also be applied to replace a rough grinding operation, and the ore can be crushed by a high-pressure roller mill to obtain a product of 3 to 10 mm in size, and the magnetite can be greatly improved after pre-magnetic separation. The grade of the mine has the characteristics of water saving, electricity saving, and production increase.
\nAt present, the high-pressure roller mill is developing in the direction of large-scale; the diameter of the roller and the roll surface are further increased, the grain size range of the grinding is larger, and the throughput is also increased. The production practice shows that the single-machine production capacity of the high-pressure roller mill can reach 1,500 to 2 000 t \/ h, and the energy consumption of the crushed metal ore is 1.2 to 2. 8 kWh \/ t. Under the same conditions, the unit energy consumption is lower than the conventional one. The machine is 20% to 50% lower, the roll surface wear resistance is good, the service life of the inlaid hard alloy grain nail roll surface can reach 8 500 h, and the automation level is high. With the improvement of the performance of the high-pressure roll mill, it is necessary for the metal mine. There will be broad application prospects.<\/p>\n![\"\"](\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2019\/10\/crushing-and-grinding-equipment.jpg\")
<\/a><\/h3>\n3. Grinding Mill Application and Development<\/h2>\n
\nHowever, if the diameter of the mill is too large, the dead zone of the ball will increase. When the mill increases processing capacity, it will also reduce the residence time of the mineral material, hindering the transfer of energy from the ball medium to the ore particles and resulting in a lower unit volume yield. The decline in the unit energy consumption of grinding products has increased, so the development direction of the mill has been developed from large-scale to high-efficiency energy-saving.<\/p>\nSelf-grinding, Semi-autogenous Grinding Machine<\/h3>\n
\nIn the self-grinding process, the ore larger than 100 mm in the mill acts as a grinding medium. The ore material with less than 80 mm and more than 20 mm has poor grinding ability, and it is not easily broken by large ore materials. Sometimes, when the material is crushed, a steel ball of about 4% to 8% of the volume of the mill is often added to the mill, which improves the grinding efficiency of the mill, and thus semi-self-grinding occurs.
\nLes semi-autogenous mill<\/strong> belongs to a cylindrical mill with heavy load, low speed, and large starting torque. Nowadays, both the new expansion and the renovation of the old factory almost all use self-grinding, semi-self-grinding technology, and self-grinding.
\nLa technologie de semi-broyage \u00e9limine le concasseur \u00e0 deux \u00e9tages et l'\u00e9quipement de criblage, simplifie le processus et am\u00e9liore les conditions d'exploitation, ce qui r\u00e9duit non seulement le co\u00fbt d'investissement de la construction, mais aussi les co\u00fbts de production et d'exploitation, et facilite \u00e9galement l'automatisation.<\/p>\nMoulin \u00e0 boulets<\/h3>\n
\nIn recent years, the development of ball mills has focused on energy saving and consumption reduction, continuously improving and perfecting the grinding machine transmission mode, researching and developing new lining plates and grinding media, striving to achieve automatic control of the grinding process, and improving the grinding process on the premise of ensuring grinding grain size. The processing capacity and grinding efficiency of the mill.<\/p>\n\n
Moulin \u00e0 barres<\/h3>\n
\nThe rod mill mainly grinds the ore through the pressure and the grinding force of the grinding rod. When the rod hits the ore, it first hits the coarser-grade ore, and then pulverizes the smaller-sized material between the rod and the wall. When the rod is in contact with the wall, the coarser-grained ore particles are mixed with it, which acts as a bar sieve. The finer-grained material can pass through the gap between the rods, which is beneficial to the clamp. The coarser-grained material also allows the coarser-grained ore particles to be concentrated in the place where the grinding media strikes.
\nPar cons\u00e9quent, le broyeur \u00e0 barres a la fonction de broyage s\u00e9lectif, et le produit a une taille de particule uniforme et moins de pulv\u00e9risation.<\/p>\nVertical Spiral Mixing Mill<\/h3>\n
![\"concassage](\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2019\/10\/crushing-and-grinding.jpg\")
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