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conical ball mill

conical ball mill for sale | wet & dry conical ball mill energy saving and efficient

conical ball mill for sale | wet & dry conical ball mill energy saving and efficient

Applications: It can be used to grind various ores and other materials, such as limestone or Portland cement, can also be used to mix raw materials in cement clinker and coal production and is widely used in mineral processing, building materials, and chemical industries.

Conical ball mill is a common ball grinding mill in mineral processing production. Conical ball mill can grind all kinds of ores and other materials, not only can be used as a pre-grinding machine for pre-grinding, but also as a grinding equipment in the fine grinding section. The barrel is composed of a conical structure at the discharge end and a cylinder structure in the middle, so the conical ball mill is named.

Compared with the ordinaryball mill machine, a conical barrel is added to the discharging end of the Harding ball mill, which not only increases the effective volume of the mill, but also makes the distribution of medium in the barrel more reasonable. Compared with the cylindrical ball mill of the same specification, the conical ball mill grinds the finished product with uniform particle size and high grinding efficiency.

Our company can produce different types ofconicalball mills: horizontal conical ball mill, energy saving conical ball mill,overflow conical ball mill,ceramic conical ball mill, wet conical ball mill and dry conical ball mill.

The circular velocity of the conical ball mill decreases gradually from the cylinder part along the direction of the outlet, so the large grinding balls are mostly concentrated in the cylinder part, and the small grinding steel balls are squeezed into the conical part near the outlet.

The material entering the mill is first crushed by the impact of the large-sized steel ball with a large drop height, and the crushed small-sized material moves into the conical part, and the small-grinded steel ball will finely grind it.

For the dry conical ball mill, when the material reaches the discharge fineness, the finished product will be sent out of the discharge port by the air supply system. The finished material of the wet conical ball mill flows out of the mill with the slurry to complete the grinding process.

The special conical structure of conical ball mill can separate the grinding medium (steel ball) naturally. The large ball is located in the largest diameter section of the barrel, that is, the feeding end; the small ball is located in the conical section, that is, the discharge end.

The coarser material obtains large impact energy under the action of the large ball at the feeding end, and completes the coarse crushing operation. The small ball is located at the discharge conical end of the conical ball mill to obtain more surface area for fine grinding.

As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials.

conical ball mills benefits & advantages: hardinge

conical ball mills benefits & advantages: hardinge

The generally recognized fact that for economic reduction of any material, it is desirable to perform such reduction in steps or stages, removing that material which is sufficiently fine as soon as it is reduced and grinding it still finer in some device more adaptable to this finer reduction. It has been found that by so doing, the efficiency of the grinding machinery is increased, since material which is already finished and not removed interferes with the reduction of the coarser particles. This general principle is applied in the laboratory for the grinding of samples, where, after the material has been ground for a short time, it is screened for the purpose of removing the finished particles and the coarser material is then returned for further reduction.

Another application on a larger scale is the use of crushers or rolls in series with screens or trommels between them for removing finished or semi-finished material. It was with this idea in mind and with a realization that the machinery in use did not embody this working principle, that the Conical Mill was designed.

In the Hardinge Mills, due to the action of the cones, the coarse material on entering the machine gravitates to the point of largest diameter. Here it comes in contact with, and is broken by, the largest balls moving at the highest velocity and falling from the greatest height. As the particles are broken, they automatically work their way forward, being subjected to a gradually diminishing breaking and crushing effect as they decrease in size. The particles undergoing reduction reach the required degree of fineness and arrive at the discharge end of the mill at the same time. Thus it is seen that this automatic classification, both of the material being reduced and of the grinding mediums, as well as their height of fall, proportions the energy expended or exerted in crushing to the work required to be performed. In this way, we obtain an ideal step or stage reduction in a single machine, which is conducive to a maximum crushing effect for a minimum expenditure of power.

This classification of the material undergoing reduction, as well as of the grinding bodies, is illustrated in Figure 1, in which it is seen that in the largest diameter of the mill, the incoming feed is acted upon by the largest balls with the greatest superincumbent weight, the greatest height of fall, and the greatest peripheral speed. The grinding bodies and the crushing forces exerted are gradually reduced, as well as the size of the material undergoing reduction, as the discharge end is reached.

The Hardinge Conical Millbecause of its conical shapeoffsets one of the serious disadvantages found in the cylindrical, compartment type mill, i. e., unproportionate speeds for the different size balls.

The Hardinge Conical Ball Millbecause of its conical shapeoffsets one of the serious disadvantages found in the cylindrical, compartment type mill, i. e., unproportionate speeds for the different size balls.

In the Conical Mill, the largest balls being kept at the greatest diameter in the cone by centrifugal force, have greater height of fall and greater peripheral speed than the smaller balls which are found at the smallest diameter in the mill. Fig. 2 shows the decreasing peripheral speeds as the diameter of the cone decreases, and shows the various size balls as they are found in the mill.

It is not claimed that the Conical Mill absolutely adjusts the energy expended in crushing to the work to be performed, since in order to make it absolutely efficient, the design of the mill would have to be adjusted to the material and particular conditions attendant upon its reduction. This, of course, would be economically impracticable. However, the Hardinge Mill more nearly approximates this desired result than does any other type of crushing or grinding machine.

The Hardinge Conical Mill can be used in various combinations for the grinding of limestone and clay mixtures, coal and cement clinker. As a mill for preliminary grinding, it is equipped with balls of various sizes selected from an assortment running from 5-in. to 2-in. balls. It will grind material of 3-inch and finer sizes, and reduce this to a size suitable for feeding to the finishing mills of the same type as the preliminary mills, except that they are equipped with smaller balls.The Metallurgical Field has demonstrated the advantages to be obtained by quickly removing the finished material from the discharge end of the mill in order to increase the output. In accomplishing this, a certain amount of oversize material must be returned to the mill. Likewise in the Cement Industry, in two-stage grinding, it is desirable to utilize a separating screen in closed circuit with the preliminary mill. In addition to increasing the output, this permits definite control of the finished product, and as the separating screen will be ahead of the second stage, or finishing mill, it allows for close regulation of the entire operation and insures a uniform product of the desired fineness.The Hardinge Mill is adapted to the complete finishing of limestone mixtures, coal and cement clinker, in one operation. To accomplish this with a good output, it is advisable to crush the feed to 3/4, or preferably1/2 in size. This will allow the use of balls ranging from about 1 1/2 in diameter to 3/4, and will give a large output with extremely low use of power.

In one-stage grinding, in order to achieve the best results, it is recommended that a considerable oversize be run from the mill and the product be obtained through a separating screen, or air separator. See Figures 3, 4 and 5 for several different arrangements.

Hardinge Mills are built in several standard sizes (see Figures 6 and 7). A complete stock of linings and repair parts is carried at all times so that deliveries can be promptly made.For dry grinding, the Conical Mill, 6-ft. in diameter and over, is made of a plate steel shell, with cast steel trunnions. Trunnions are machined on the inside faces of their joints together with the plates before being riveted to the cones, insuring a perfect fit and producing a cylindrical truss of great strength. All rivet holes are drilled in trunnion castings, countersunk and rivets flattened on the inside of the mill, making a smooth surface for the lining.

When completely assembled and riveted, the drum is swung in a lathe, centered, the trunnions turned and polished, and the supports for the gear machined. This method of construction and the care exercised in the plate work assure a true alignment of trunnions and gears, as well as a machine which is perfectly balanced, with the consequent advantages of smooth, even-running and minimum power consumption. All seams and joints in the shell are thoroughly caulked andtested before shipment. Gears are ample in size and are made of steel, with cutor cast teeth, as desired.

Mills furnished for wet grinding may be supplied with cast iron trunnions, cones, gears and gear rings. The absence of heat in mills used on this class of work permits the use of less expensive material.

The feeder supplied for coarse, dry feed is of the plunger type, which is positive in action. Where the feed is 1J/2 inches or smaller, it is practical to use a screw feeder with cast steel or cast iron flights.

For wet grinding, the feeder is simple and takes no extra machinery for its operation. A patent reversible scoop feeder or a conical feeder may be used. Under certain conditions, a combination scoop and conical feeder may be used to advantage.

The Conical Ball Mill is lined with Titanite metal plates which are heldin place by heavy chrome steel bars and heavy taper head bolts. The design of the bars and bolts allows for considerable wear on the bars without affecting the bolts. The construction of the lining, as indicated by the illustration, prevents the slipping of balls, thereby increasing the efficiency of the mill and reducing the wear on both lining and balls.

The charge for balls furnished with the mill varies with the size of feed and product desired. The larger sized balls are made of forged steel. For sizes of 2 in. and smaller, cast iron balls of a special mixture are recommended, as they are more uniform in size and material and less subject to fracture.

Hardinge Mills may be used for grinding limestone or raw material mixtures used in the manufacture of Portland Cement, cement clinker and coal, either as preliminary or finishing machines, or as units to complete the grinding in one operation. The size of the plant determines in a large measure the best way to utilize the machine. In a large plant, it is recommended that the mills be installed in two stages with a screen between the two sets of mills to insure a uniform product for the finishing mills. Used in this way, as indicated on the diagram or flow sheet, one mill or battery of mills would perform the heavy grinding, say, from feed which would pass through a 1.5 ring, delivering the product to a separating screen. From this separating screen, the finished material would pass immediately to conveyor lines running to cement storage; the material which has passed through the 20-mesh screen, would go to one or more finishing mills for final grinding; and the oversize or rejected material would be returned to the preliminary mill for further grinding as indicated on the flow sheet. This insures the greatest possible production and the lowest cost of operation.

For grinding in one-stage operation, it is advisable to reduce the feed by rolls or crushers so that it will pass a %-in. ring. This permits the use of much smaller balls. In order to get the greatest possible production from a Conical Mill in a one-stage operation, it is recommended that a separating screen be used in closed circuit with the mill. (Air separators may be used instead of screen if desirable.) From this screen, the finished material will pass directly to the cement storage, and the oversize will be returned to the feed end of the mill for further grinding.

The results from one-stage grinding do not show quite the same efficiency as from two-stage operation, but it is often desirable, particularly in small plants, to complete the grinding in one or two mills in order to take advantage of the greater efficiency which is obtainable by the use of larger units. The results obtained in exhaustive tests made within the past two years in grinding an unusually hard clinker, taken with the extensive experience of the Hardinge Company in the grinding of many kinds of ores and industrial material, permit a close approximation of results that may be expected in the grinding of cement clinker.

These capacities are furnished as a guide for the selection of sizes of mills that will meet the desired requirements, and are not to be considered as absolutely correct on account of the various degrees of hardness of cement clinker. It may, however, be expected that Hardinge Mills will grind approximately the amount of material indicated, and in many cases the capacities will greatly exceed these figures.

The cost of grinding with Hardinge Mills is remarkably low. It has been found, by comparing the operation of Conical Mills with cylindrical tube mills in the grinding of ore and limestone, that with the same ball load in both types of mills, the cylindrical mill will consume about 60 per cent, more power for the same work as will the Conical Mill. Likewise, in comparison with a cylindrical tube mill, taking approximately the same power for operation, the Conical Mill will have a capacity greatly in excess of the tube mill, with a consequent lower cost of operation. It has been definitely determined that the wear on the lining plates and balls per ton of material ground, is much less in the Conical than in the cylindrical ball and tube mills.

Hardinge Mills require a minimum amount of attention in operation and maintenance, and, due to the low consumption of power per barrel of clinker, the cost of grinding is remarkably low. Clinker ground in Hardinge Mills with a maintenance cost at present prices should not exceed one-half cent per barrel, and on a conservative estimate, the complete cost of grinding on a five-year basis, during which time the first cost of equipment may be entirely absorbed, should favor the Hardinge Mill by at least 50 per cent, over any other machine or combination of machines presently used in the cement industry.

The Engineering Staff of the Company has had extensive and varied experience in the grinding of materials used in the manufacture of Portland Cement and various other industrial products, as well as the reduction of practically all types of ore. Their knowledge of the many problems incident to this work is at the disposal of those desiring information regarding the application of the Hardinge Mills to their individual requirements. In order that we may make an intelligent recommendation of the size and type of Conical Mill most adaptable, it is necessary that we have the following information:

wet ball mill/wet type ball mill/wet ball milling machine--zhengzhou bobang heavy industry machinery co.,ltd

wet ball mill/wet type ball mill/wet ball milling machine--zhengzhou bobang heavy industry machinery co.,ltd

Wet type ball mill are mostly used in the industry production. It is to increase the high grinding efficiency under the ball mill grinding and striking, from which the granularity is even and no flying dust with little noise, being the most universal powder machine in the benefication as powder grinding the ferrous metal like gold, silver, plumbum, zinc,copper,molybdenum,manganese,tungsten etc, as the nonmetal powder grinding like graphite,feldspar, potash feldspar, phosphorus ore, fluorite, clay, and swell soil etc. The wet type ball mill need to add the liquid into the grinding ball media auxiliary (water or ethanol). The material output gate is trumpet shape, with screw device inside, easy to discharging the material.

Copyright Zhengzhou Bobang Heavy Industry Machinery Co.,Ltd. E-mail : [email protected] Tel0086- 86656957 Address No.11 West Construction Road, Zhongyuan District,Zhengzhou City,Henan Province, China

hardinge conical ball mill

hardinge conical ball mill

The Hardinge Ball Mill consists of three sections. After the usual type of trunnion bearing the mill consists of a short conical section showing a sharp drop from feed entrance to maximum mill radius. A cylindrical section of varying length then follows and toward the discharge end connects with a comparatively long and conical section sloping, at considerably less pitch than at the feed end, toward the discharge. In principle it has been claimed that a separation and grading of the balls in sizes, resulting in a corresponding graduation in the force of the crushing blow, occurred in the mill to the extent that single-passage crushing might be advocated. The successive reduction of the ore particle from rock to sand or gravel to slime was pictured as an actual achievement and as a logical departure from the normal current practice with cylindrical mills. These views havebeen proved somewhat fallacious. The balls do not segregate to the extent assumed, and careful investigation has proved that the discharge sections may consist of balls of a larger average size than the medium of the balls used in the mill. A. F. Taggart (Trans. A. I. M. E., Sept., 1917) has also demonstrated that efficient Hardinge-mill operation cannot be effected by single-passage grinding, and a return classification system is indicated as desirable, as with the cylindrical mill. This would seem effectively to dispose of the graduated blow theory. Standard Sizes of Hardinge Mills are given in Table XLVII. A summarized statement of data, consisting of the average performance of a number of these machines, is given in Table XLVIII.

The HARDINGE MILL is the invention of Mr. H. W. Hardinge, a ConsultingMetallurgistof over thirty-five years experience in metallurgical work, who found it necessary to devise a machine which would be more efficient than the existing machines in use, such as rolls, cylindrical ball and tube mills, roller mills, hammer mills, and various types of high speed pulverizers. The Conical Mill is now being used in all parts of the World, having substituted these latter types of machines in the grinding of ores and other materials. Hardinge Conical Ball Mills are used to do the work of any combination of the above machines and will produce the desired results, depending upon the size and type of mill used.

Grinding can be done either wet or dry, and on account of the Conical shape of a Hardinge Mill, a positive discharge can be obtained without the use of internal screens, such as are employed with practically all high speed pulverizers and machines of the ordinary ball mill type.

It is a generally recognized fact that for economic reduction of any material, it is desirable to perform such reduction in steps or stages, removing that material which is sufficiently fine as soon as it is reduced and grinding it still finer in some device more adaptable to this finer reduction. It has been found that by so doing, the efficiency of the grinding machinery is increased, since material which is already finished and not removed interferes with the reduction of the coarser particles. This general principle is applied in the laboratory for the grinding of samples, where, after the material has been ground for a short time, it is screened for the purpose of removing the finished particles and the coarser material is then returned for further reduction.

Another application on a larger scale is the use of crushers or rolls in series with screens or trommels between them for removing finished or semi-finished material. It was with this idea in mind and with a realization that the machinery in use did not embody this principle, that the Conical Mill was devised.

In the Hardinge Mills, due to the action of the cones, the coarse material on entering the machine gravitates to the point of largest diameter. Here it comes in contact with, and is broken by, the largest balls moving at the highest velocity and falling from the greatest height. As the particles are broken, they automatically work their way forward, being subjected to a gradually diminishing breaking and crushing effect as they decrease in size. The particles undergoing reduction reach the required degree of fineness and arrive at the discharge end of the mill at the same time. Thus it is seen that this automatic classification, both of the material being reduced and of the grinding mediums, as well as their height of fall, proportions the energy expended or exerted in crushing to the work required to be performed. In this way, we obtain an ideal step or stage reduction in a single machine, which is conducive to a maximum crushing effect for a minimum expenditure of power.

This classification of the material undergoing reduction, as well as of the grinding bodies, in which it is seen that in the largest diameter of the mill, the incoming feed is acted upon by the largest balls with the greatest superincumbent weight, the greatest height of fall, and the greatest peripheral speed. The grinding bodies and the crushing forces exerted are gradually reduced, as well as the size of the material undergoing reduction, as the discharge end is reached.

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