The grinding circuit of a zinc concentration plant is shown in Figure 2. The plant is treating 250tph of ore containing 4% moisture. The cyclone underflow contains 50% solids by volume, the overflow 30% solids by weight and the ball mill discharge 45% solid by volume. The circulating load ratio of the circuit was found to be 300%.
WhatsApp: +86 18037808511
The mill is fully charge and we cannot add more. Moreover, with the mill fully charge, ballmill amps is 98, not even nearly close to the amps we had when it was a rodmill (130 amps when fully charged). We tried several solids density from 70% to 82% solids but in vain. Please note that we still have the mill running at % critical speed.
WhatsApp: +86 18037808511
Other times, you need to enlarge the ball size diameter ie: using a 75 mm ball instead is 35 mm. Other times, you must control and reduce the feed size (crushing circuit product). Therefore, no, changing to a grate discharge ball mill from overflow would not improve the situation.
WhatsApp: +86 18037808511
Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 250 microns.; The CenterPeriphery Discharge mill has feed reporting from both ends and the product discharges ...
WhatsApp: +86 18037808511
Ball Mill. The proven classical option for cement grinding. Whether employed as a twocompartment separator mill in an independent grinding system, or in combination with a high pressure grinding roll, the Ball Mill is a robust and reliable alternative for cement and granulated blast furnace slag grinding. Used in combination with the sepol ...
WhatsApp: +86 18037808511
Ball Mills. Although ball mills were first introduced in the 1860's, the main progress was made during the 1870's to 1900's in Germany, where its growing cement and chemical industries ...
WhatsApp: +86 18037808511
A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles ...
WhatsApp: +86 18037808511
A cutaway view of the ball mill showing the wave liner in the belly region of the mill and the discharge head lifter bars extending into the trunnion (which are intended to guide escaping balls back into the grinding chamber) is shown in Fig. 4. To limit ball escape from the mill, the discharge trunnion contains a retaining spiral which is ...
WhatsApp: +86 18037808511
SAG mill discharge, • ball mill discharge, • cyclone feed, • cyclone overflow, • cyclone underflow, • flash concentrate, • flash top discharge. It was not possible to sample the flash bottom discharge due to the absence of a sampling point, though this stream can be reconstituted from data obtained for other streams around the flash ...
WhatsApp: +86 18037808511
Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. ... For low tonnage operations you can feed 100% of the ball mill discharge to the concentrator (this requires an extra pump, but is worth the effort). Modern units can recover free gold down to the 10 micron size range or finer.
WhatsApp: +86 18037808511
In the circuit the dry solids of density 300 kg/m3 are fed at the rate of 25 tons/h. The feed to the cyclone contains 36 % solids by weight. As a result of a screen analysis, it is found that the proportions of the material finer than 250 micron in the rod mill discharge, cyclone feed and ball mill discharge is 27%, 14% and 5 % respectively.
WhatsApp: +86 18037808511
rod mills 1/1800 ball mills, grate discharge 1/1200 ball mills, overflow type 1/1470 pebble mills 1/1200. W for rod and ball mills shall be taken as the weight of the rod or ball charge, the weight of the pulp is to be ignored. For pebble mills therefore W is to be calculated on the basis of the bulk weight of the pebbles.
WhatsApp: +86 18037808511
By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ballmill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling: while convenient, this has the ...
WhatsApp: +86 18037808511
Here we list 17 signs to mention you that the ball mill is running and needs to be checked in. Find the abnormal signs early is very important to prolong the ball mill service life. 1. The sign of "swollen belly". Just like a bloated stomach, if the amount of grinding exceeds the maximum capacity and discharge capacity, it will cause the mill ...
WhatsApp: +86 18037808511
Overflow Discharge Ball Mill in Operation in a RockPhosphate Processing more videos related to Mineral Processing visit my YouTube channel :http:/...
WhatsApp: +86 18037808511
The size of the blind trommel and magnetic circuit can be varied to retrofit an existing ball mill and available space at the discharge. The magnetic circuit is designed to provide maximum strength for high slurry throughputs and up to 4 inch diameter grinding balls. The trunnion magnet can be configuration for reversing or bidirectional mills.
WhatsApp: +86 18037808511
where d is the maximum size of feed (mm); σ is compression strength (MPa); E is modulus of elasticity (MPa); ρb is density of material of balls (kg/m 3); D is inner diameter of the mill body (m).. Generally, a maximum allowed ball size is situated in the range from D /18 to D/24.. The degree of filling the mill with balls also influences productivity of the mill and milling efficiency.
WhatsApp: +86 18037808511
The embodiment of the invention shown in the drawings comprises pickup and discharge means afiixed on the left end of a ball mill 20, the discharge end of which is shown in FIGS. 1 and 3. The ball mill is the usual generally cylindrical drum having an end wall 21 provided with an axially extending hub 22 rotatable in bearings 23 on a base 24 ...
WhatsApp: +86 18037808511
One of our Ball Mills keeps losing pressure on the high pressure pump. It will run fine when starting the Mill and suddenly after a while sometimes 1hrs the pumps will loose pressure. We have just grinded the journal and installed new white metal bearings. After startup this afternoon after about 1hrs the pumps low and high just lost pressure.
WhatsApp: +86 18037808511
Discharge grates play an important role in determining the performance of autogenous, semiautogenous and grate discharge ball mills. The flow capacity (grinding capacity) of these mills is strongly influenced by the discharge grate designopen area and position of apertures, as well as the performance of the pulp lifters.
WhatsApp: +86 18037808511
Ball Mills Talk with the Experts Wet Dry Size Reduction sales phone: fax: JH 62012 ... Small ball mill with dry discharge housing and drawer to catch milled solids. Dry discharge requires the use of a dust tight enclosure. Shown here is a full housing
WhatsApp: +86 18037808511
Installed between the mill discharge trunnion and the . trommel, deflectors provide a homogenous and controlled . feed of the mill discharge pulp onto the trommel screening surface. This allows maximum use of the available surface area. The deflectors assist in improving pulp distribution to improve screening efficiency.
WhatsApp: +86 18037808511
Discharge of pebbles, finer rock, ball scats and slurry from mills and its flow through trommels, and into other processing operations has strong impacts on overflow ball mill performance.
WhatsApp: +86 18037808511
measure CSE is a size distribution for the mill feed and discharge. For the typical reverse configuration ball mill circuit (Figure 1), this is achieved by taking a sample of cyclone underflow and a sample of ball mill discharge, and then running a screen analysis in the lab. For forward fed circuits ( primary ball milling), a
WhatsApp: +86 18037808511
Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. ... slurry density at ball mill discharge is 78 80% solids that classification was done about 3 weeks ago wear rate of the balls is approx /t the mill is currently consuming 1450 KW
WhatsApp: +86 18037808511
The ball mill discharge density should be checked manually at regular intervals and adjustment made to water ratio controller setpoint to adjust the ball mill discharge density. The grinding circuit operator must ensure that the ball mill runs properly loaded and gives the correct ore grind. A major practical indication of mill loading is the ...
WhatsApp: +86 18037808511
A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
Copyright © 2023 GMC Co., Ltd. SiteMap
