Mill ball mill steel ball
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Ball mill is the key equipment to crush the material after it is crushed
ball mill is one of the high fine grinding machines widely used in instrial proction
there are many kinds of ball mills, such as horizontal ball mill, ball mill bearing bush, energy-saving ball mill, overflow ball mill, ceramic ball mill, lattice ball mill, etc
ball mill is suitable for grinding all kinds of ores and other materials. It is widely used in mineral processing, building materials and chemical instry. It can be divided into dry grinding and wet grinding. According to the different ways of ore discharge, it can be divided into grid type and overflow type. The output of the ball mill is not only affected by the ball loading, but also related to the ball diameter. A certain ball diameter and a certain proportion of balls with different diameters are required. Generally, the size range of ball diameter in the cylinder is 25-60mm. If there are large diameter balls in the cylinder, its impact force is large, which is beneficial to crushing large coal. However, e to the large gap between balls, small relative surface area and weak extrusion and grinding effect, the output of coal mill and the fineness of pulverized coal are unfavorable. There are too many small diameter steel balls in the cylinder, and the impact force is small, which will rece the output of the coal mill. At the same time, e to the relative increase of the surface area of the steel balls, the wear of the steel balls will increase, and the power consumption of the coal mill will increase
for example, ring the operation of the coal mill, e to wear and tear, the weight and diameter of the steel balls are constantly decreasing, so it is necessary to add new balls regularly to maintain a certain steel ball loading capacity. Generally, the ball with large diameter is added, and the amount of ball supplement should be determined according to the ball wear rate (the wear amount of steel ball per ton of coal) and the coal grinding amount. After the mill has been running for a certain period of time, the number of small diameter steel balls in the cylinder increases. Therefore, it is generally necessary to stop the machine to clean the steel balls after 3000 hours of operation, so as to remove the balls with diameter less than 15mm and broken balls, and make up for new balls at the same time. The newly installed ball mill has a running in process. During the running in process, the amount of steel balls is added for the first time, accounting for 80% of the maximum ball loading of the ball mill. The proportion of steel balls can be adjusted according to the size of steel balls Φ 120㎜、 Φ 100㎜、 Φ 80㎜、 Φ 60㎜、 Φ 40 mm). Different ball mill models have different ball loading. For example, mqg1500 × The maximum ball loading capacity of 3000 ball mill is 9.5-10 tons. For the first time, large balls (120 mm and 100 mm) account for 30% - 40%, medium balls (80 mm) account for 40% - 30%, and small balls (60 mm and 40 mm) account for 30%
why only 80% steel balls are added in the running in process of the ball mill, because after the ball mill is installed, the big and small gears of the ball mill need to be meshed, and the processing capacity also needs to be graally increased. After two or three days of normal continuous operation of the ball mill, check the meshing condition of the big and small gears. After everything is normal, open the manhole cover of the ball mill and add the remaining 20% steel balls for the second time
note: the addition of small steel balls is only the first time. Because the reasonable friction between steel ball and steel ball, steel ball and ore, steel ball and lining plate of ball mill ring normal operation of ball mill will increase the wear, making large ball mill small and medium ball mill small. So usually under normal circumstances, there is no need to add a small ball. In the case of adding small balls, there is no monomer dissociation in the particle size of useful minerals. When the fineness of grinding machine can not meet the flotation requirements, appropriate amount of small balls can be added. The steel ball in the ball mill is constantly worn in the process of operation. In order to maintain the ball load filling rate and the reasonable ratio of balls, and maintain the stable operation of the ball mill, it is necessary to make reasonable ball replenishment and low compensation wear
the weight of the steel ball is based on the quality of the steel ball. The quality of the steel ball determines the amount of ore added per ton. It is better to use a new type of wear-resistant steel ball, such as the steel ball forged by special treatment of the train hub
e to the continuous operation of the ball mill and the impact and stripping of ore, the steel balls are constantly worn, which destroys the original steel ball ratio and loading amount, and the ball amount is graally reced. In order to keep the loading amount and proportion of steel balls stable, a certain number of steel balls must be added regularly. Otherwise, proctivity will decrease. At present, at home and abroad, the original addition of a large diameter steel ball is changed to three to four kinds of steel balls with different diameters. The cumulative effect of simply adding one kind of big ball will lead to more big balls in the ball mill and the grinding effect is not good. The total amount of steel balls to be added should be calculated according to the amount of ore and wear index of steel balls. In proction, only one or two kinds of big balls are added, because the reasonable grinding between steel balls and steel balls, steel balls and ore, steel balls and lining plate of ball mill will increase the wear, and make the big ball mill small (grinding to medium ball) and the medium ball mill small ball. So usually under normal circumstances, there is no need to add a small ball. In the case of adding small balls, there is no monomer dissociation in the particle size of useful minerals. When the fineness of grinding machine can not meet the flotation requirements, appropriate amount of small balls can be added. The quantity of supplement is generally determined according to the consumption quota of steel balls. The rod mill and ball mill add steel bar regularly
it is a complex problem to add steel ball, so far the wear law of the ball is not well understood. Each concentrator must explore the experience of adding steel balls according to the actual situation and through long-term observation and research. This information comes from www.gyxxjx.com
the expression of unit time processing capacity is simple, but the influence of feeding particle size, proct particle size and mill volume is not considered. Only in the case of the same length, the same mill specifications and the same feeding and discharging particle size, the working condition of mills can be simply and clearly reflected, and the working performance of each mill can be evaluated. The processing capacity per mill is the quantity of raw ore processed by each mill per hour
the utilization coefficient refers to the proctivity expressed by the quantity of new-200 mesh obtained per unit time and unit mill volume, unit: T / m3 · H. According to the specific proctivity of - 200 mesh, the influence of feed and discharge particle size and volume factor is eliminated, which can truly reflect the working condition of the mill and compare the working condition of the mill under different specifications and different feed particle size This method is applied in design)
q-200 mesh = q original β Procts - β In the formula, q-200 mesh is the unit volume proctivity calculated according to the newly generated particle size of - 200 mesh< br /> β Proct - content of 200 mesh size fraction in grinding proct (overflow of classifier in closed circuit grinding and discharge of grinder in open circuit grinding),%< br /> β Content of - 200 mesh size fraction in feed mill raw ore,%;
rod mill is a kind of mill in which the grinding body is steel rod. Rod mill generally adopts wet overflow type, which can be used as first-class open circuit grinding. It is widely used in first-class grinding of artificial sand, concentrator, chemical plant and power department. The mill is mainly composed of motor, main recer, transmission part, cylinder part, main bearing, slow transmission part, feeding part, discharging part, ring seal, playful voice station, big and small gear spray lubrication, foundation part, etc. The main recer has parallel shaft and hard tooth surface. The rod mill is an asynchronous motor connected with the pinion through the recer, which directly drives the peripheral big gears to decelerate and rotate, and drives the rotary part to rotate. There is a suitable grinding medium steel rod in the cylinder. Under the action of centrifugal force and friction, the grinding medium continuously enters the cylinder from the feeding part and is crushed by the moving grinding medium, And through the overflow and continuous feeding force, the proct is discharged out of the machine for the next process. Its working principle, structure, type, grinding medium, application, installation and installation precautions are introced in detail.
generally, the newly installed ball mill has a running in process. During the running in process, the amount of steel balls is added for the first time, accounting for 80% of the maximum ball loading of the ball mill, and the proportion of steel balls can be adjusted according to the size of steel balls Φ 120㎜、 Φ 100㎜、 Φ 80㎜、 Φ 60㎜、 Φ 40 mm). Ball addition: different ball mill models have different total ball amount. For example, mqg1500 × 3000 ball mill (processing capacity 100-150 tons) maximum ball loading capacity 9.5-10 tons. The first time to add steel ball & Oslash; 120 mm and & Oslash; 30% - 40% for 100 mm, 40% - 30% for 80 mm for middle ball and 40% - 30% for small ball; 60 and & Oslash; 40 mm), accounting for 30%
why only 80% of the steel balls are added in the running in process of the ball mill? Because after the ball mill is installed, the big and small teeth of the ball mill need to be meshed, and the processing capacity (ore volume) also needs to be graally increased. After two or three days of normal continuous operation of the ball mill, stop the ball mill and check the meshing condition of the big and small gears. After everything is normal, open the manhole cover of the ball mill and add the remaining 20% of the steel balls for the second time. After the ball mill starts up and runs normally, the steel balls of each shift are added according to 3:4:3 & Oslash; 120 mm is 3; 100 mm is 4; 80 mm is 3) added. Note: the addition of small steel balls is only the first time. Because the reasonable grinding between steel ball and steel ball, steel ball and ore, steel ball and lining plate of ball mill ring normal operation of ball mill will increase the wear, and make large ball mill smaller (grinding to medium ball) and medium ball mill smaller. So usually under normal circumstances, there is no need to add a small ball. In the case of adding small balls, there is no monomer dissociation in the particle size of useful minerals. When the fineness of grinding machine can not meet the flotation requirements, appropriate amount of small balls can be added. The steel ball in the ball mill is constantly worn in the process of operation. In order to maintain the ball load filling rate and the reasonable ratio of balls, and maintain the stable operation of the ball mill, it is necessary to make reasonable ball replenishment and low compensation wear. The added weight of steel ball is based on the quality of steel ball, which determines the added amount of ore per ton. It is better to use a new type of wear-resistant steel ball. The best (good quality) steel ball addition is calculated according to the amount of ore per ton (i.e. 0.8kg per ton of ore added). The average steel ball treatment needs (1kg-1.2kg) per ton of ore. Steel ball size ratio: different ball mill models have different proportions. The diameter of ball mill is less than 2500 mm, and the size of steel ball is & Oslash; 100㎜、Ø 80㎜、Ø 60㎜ The diameter of ball mill is more than 2500 mm, and the size of steel ball is & Oslash; 120㎜、Ø 100㎜、Ø 80㎜