Cylpebs Grinding Media For Gold Ore Mine Introduction Dongbang brand cylpebs grinding media for gold ore mine, specially designed for gold ore mine, offer you higher hardness 63-64HRC and very excellent wear-resistance. Technical Specifications Application: Grinding Cylpeb For Gold Ore Mine,...
Cylpebs Grinding Media For Gold Ore Mine Introduction Dongbang brand cylpebs grinding media for gold ore mine, specially designed for gold ore mine, offer you higher hardness 63-64HRC and very excellent wear-resistance. Technical Specifications Application: Grinding Cylpeb For Gold Ore Mine, used at phase 2 or phase 3 ball mill, only to get finer gold ore particles. Certification:ISO9001, ISO14001, OHSAS18001 etc. Original:Jiangyin, Jiangsu, China Price:Negotiable Payment term:TT, LC Delivery date:Negotiable Packing:ton bag or Iron drum Major Market:Middle East/ Africa/Asia/South America/Europe/North America MOQ:50 tons each size(2x20GP) Raw material:Alloy Steel rod Cypleb Size:20x35mm, 25x40mm, 30x45mm, 40x55mm Detailed quality performance of Grinding Cylpeb For Gold Ore Mine:
Grinding media, used to extract the concentrate for the production of metals, are the main components in the ball mill grinding process. There are different types of milling media used in grinding such as steel balls, ceramic balls and cylpebs.
Steel grinding media are ideal for extracting precious metals in ore beneficiation. Spherical ball mill media have an advantage of better crushing effect when impacting large particles because point contact between balls and raw materials makes the materials easy to be smashed.
As the name implies, this grinding media are made of ceramic which is energy-saving and environmentally friendly. The ceramic ball has a Mohs hardness of 9.0, which is second only to diamond, far exceeding the wear resistance of steel and stainless steel. It has the best behavior of wear and its consumption is generally 50% of the steel ball. Under the same conditions, it can extend the service life of the equipment more than 10 times by using ceramic balls.
When the cylpeb is used as the media for grinding, the products of each grain level are relatively uniform. It has certain selectivity for grinding intermediate products and has certain protective effect for minerals, but the crushing strength is not as good as balls. Cylindrical ball mill media is more suitable for fine material grinding because the contact area is larger with the line contacting each other.
(1) If it is too much, the grinding media will be overlapped with each other, thus the crushing capacity of each steel ball cannot be fully utilized and the kinetic energy consumption will be increased.
(2) If it is too little, although the crushing capacity of each steel ball is fully exerted, the total crushing capacity is still limited. Therefore, it is necessary to choose the appropriate amount of ball.
When the speed of the ball mill is fixed and the ball loading is 30% of the total capacity of the cylinder, the balls movement is mainly sliding, but it has begun to pour. When the ball load exceeds 40%, the ball is pouring; When it reaches 50%, the surface of the ball is just on the diameter line of the cylinder, so it is easy to pour which is exactly needed for ball mill production.
According to the actual results, when the charging is 40%, the output is the highest. While it is usually about 35% in real production, that is, the volume of the ball is kept lower than the horizontal centerline.
The ball size in a mill has a significant influence on the mill throughput and power consumption. Here the ball size refers to two aspects, one is the maximum ball size, and the other is the correct ball size ratio.
The size of the grinding media directly affects the grinding efficiency and product fineness. The larger the diameter, the larger the product particle size and the higher the yield. This empirical formula is currently widely used in European and American countries and regions:
However, this problem is difficult to solve because there are too many parameters that affect the size of the grinding ball. At the current cognitive level of human, it is impossible to deduce the theoretical calculation formula of the milling ball diameter. This is because it is impossible to include more than a dozen factors that affect the ball diameter, let alone some influencing factors cannot be described by quantity.
After determining the proper amount of grinding balls, it is also needed to choose the right ball ratio. The most common in production are the two-stage ratio and the multi-stage ratio. Generally, the multi-stage ratio follows the principle of less at both ends, more in the middle which means that large and small balls are less and middle balls are more.
The so-called two-stage ratio is to use two different sizes of steel grinding balls with a large difference in diameter to carry out the grading. The multi-stage is suitable for the materials with small particle size and good abrasive property, while the two-stage ratio is suitable for the materials with large particle size and poor abrasive property.
Steel consumption constitutes a significant proportion of grinding costs in industrial ball mills. Approximately 0.23 billion kg of steel (1986) in the US and over 0.45 billion kg in the world were consumed each year in wet grinding alone. This steel consumption is mainly attributed to the wear of grinding media and liners.
Attrition plays a large part in all fine grinding and has been known and acknowledged. The rate of ball wear during the abrasive process is proportional to the surface area of the ball or the square of the ball diameter.
Electrochemical interactions between the grinding media and minerals, occur especially in wet grinding; resulting in media corrosion. In the same ball mill, the corrosion rate on the surface of each medium will be the same regardless of the size of the mill. Increasing mill size will increase energy consumption, which in turn increases metal loss due to abrasive and impact wear.
The ball to powder ratio is determined by the golden ratio, that is, the ball: material: (water + air) =1.618:1:0.618. The range of ball-to-water ratio mentioned in textbooks is (1.4 ~ 2.2): 1: (0.45 ~ 0.58), without mention of air and the golden section. But in fact, if there is not enough air to scour the water and raw materials, there is no ball grinding efficiency. Its a kind of optimal allocation principle, but the specific will be determined according to the material, the grinding media and the ball mill.
Grinding balls. This type of the grinding media made of steel and cast iron. Manufacturing methods helical rolling of round billet, molding, stamping. Recently, manufacturers of stamped balls losing their relevance in the market, because this method is quite energy intensive, which leads to higher costs of the finished products. The molding is a second method by the cost of production the finished products. Basically, a ball poured of cast iron. This type of production of grinding balls is expensive also. In addition to energy consumption, a large percentage of waste in production affect to the cost of the finished product. Today, the most competitive technology of production the steel grinding balls is a helical rolling of round billet. For sufficiently small energy consumption at the production, the quantity of waste less than 1-1.5% by the total volume of the raw material.
Cylpebs. This type of grinding media are manufactured by casting and rolling method. Rolled cylpebs is not common in the market of grinding media. This is caused by high production costs and low milling quality, which gives this type of grinding media. In most cases, cylpebs produced from gray and white iron by casting method. It should be noted that this type of grinding media has a number of disadvantages, depending of the cast iron type used in production of cylpebs. For example cylpebs of gray cast iron is soft enough and as result an increase in specific consumption of grinding media in the grinding process. Cylpebs production of white cast iron is very expensive and this caused by the high cost of the chemical elements that are part of the white cast iron.
So what is better, a ball or a cylpebs? As shown recent researches, the ball charged to the ball mill has a large contact area, providing better quality of grinding in comparison with the grinding cylpebs. In confirmation of this, currently, almost all the companies partially or completely refused of using cylpebs during grinding.