In this post, we're going to learn more about rod mill. We'll cover it from two aspects: 1. Working principle. 2. Structure. Let's dive right in! 1. Working Principle of Rod Mill. Rod mill is a common equipment for grinding operation in mineral concentrator, which is mainly suitable for rough grinding operation.
Figure 8.2 shows a flow sheet where the rod mill is in open circuit and the ball mill is in closed circuit with a classifier. This is a normal set-up as the primary function of a rod mill is to provide a uniform sized feed to the ball mill. Figure 8.3 shows that the rod mill product is classified and a more uniform feed size is, therefore, discharged to the ball mill whose …
Overflow Ball Mills: These mills have a horizontal cylindrical shell with an outlet at one end. The materials are fed into the mill through the hollow trunnion at the other end. The overflow type ball mill is suitable for fine grinding and operates in a …
How Overflow Type Ball Mill Works. Material Feed: The raw material is fed into the mill at one end and travels through the mill by rotation. The feed enters the mill at a specific rate, ensuring a controlled grinding process.; Grinding Process: As the mill rotates, the grinding media crushes and grinds the material into a fine powder. The wet …
The maximum size of the ore can be up to 50 mm. Its crushing ratio is between 15:1 and 20:1. Types Rod Mill Worksite. There are three general-purpose rod mills. Including overflow type, end peripheral discharge type, central peripheral discharge type. Overflow type: It is most commonly used. Its product size is finer than that of the other two ...
A wet overflow rod mill was operated at 75% of the critical speed and found to draw 8.5 kW/t of rods when the mill was loaded to 35% of its volume. A certain number …
Rod Mill Autogenous Mill; Length: Diameter Ratio: 1.4 to 1.8: 0.5 to 3.5: 0.25 to 0.50: Feed Size: 2.5 cm maximum ... Ball Mill Size as a Replacement. ... the mill shaft power for wet overflow mills calculated …
In this paper the effects of flow rate, slurry solid content and feed size distribution on the rod mill efficiency have been investigated. It is difficult to achieve highest grinding efficiency ...
Meet your coarse grinding needs with Rod Mills suitable for limestone, potash, coal, phosphate and bauxite grinding in low tonnage operations. ... Most discharge via trunnion-overflow; Volumetric loading is similar to that of a ball mill (30-35%) ... (max. size: 5MB; format: JPG, JPEG, PNG, SVG, GIF, PDF) Please fill out the required fields.
Assuming that the circuit is sampled and the results are shown in the Table below: Rod Mill Discharge Ball Mill Discharge Cyclone Overflow Cyclone Underflow Percentage (%) -200 mesh 5 20 30 Solid percentage (%) by …
the rod mill product is precisely the feed size distribution, and it has been demonstrated that a rod mill achieves the same level of fine particles at a lower energy consumption level [15]. We also have throughput, which directly affects the residence time [16] and impact on the material reduction rate [2].
Select the proper size and number of cyclones for a rod mill/ball mill circuit where new feed to the rod mill is 250 metric tons per hour (MTPH) solids. Both mill discharges join together at cyclone feed sump and are pumped to cyclones. Overflow is to be XY % - 200 mesh (74 microns) at a minimum of 40% solids by weight.
Therefore, use two 3.66 meter (12 foot) diameter inside shell 3.46 meter (11.35 foot) diameter inside new shell liners by 5.18 meter …
Rod Mill Autogenous Mill; Length: Diameter Ratio: 1.4 to 1.8: 0.5 to 3.5: 0.25 to 0.50: Feed Size: 2.5 cm maximum ... Ball Mill Size as a Replacement. ... the mill shaft power for wet overflow mills calculated using the above expression appeared to …
Question: Select the proper size and number of cyclones for a rod/ball mill circuit given the following conditions: o New feed to the rod mill = 250 tph o Discharge from both mills join together at cyclone feed sump and is pumped to cyclones. o Cyclone overflow is at 60% minus 74 microns @ 40% solids by wt. o Cyclone underflow @75% solids by weight is …
Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh). Grinding action is by line contact between the rods extending the length of the mill. ... Of the three main types of rod mill, overflow, end peripheral discharge, and center peripheral discharge only the overflow mill ...
Meet your coarse grinding needs with Rod Mills suitable for limestone, potash, coal, phosphate and bauxite grinding in low tonnage operations.
Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh). Grinding action is by line contact between the rods …
Ball mills can be divided into overflow-type and grid-type, while rod mills are classified into overflow-type and open-type rod mills. ... The discharge particle size is usually between 0.833~0.147mm, and the particle size characteristics of the rod mill product differ from those of the rod mill. It is related to the condition of the ore.
Difference Between a Rod Mill and Ball Mill. Rod Mills has a very define and narrow discharge product size range. Feeding a Rod Mill finer rocks will greatly …
This type of rod mills normally feeds balls of less than 15 to 30 mm in diameter to produce 80% product size 500 to 1000m. Fig. 3 Overflow Discharge Type (O.F.D. Type) Use. 1) Mining Industry: ... Capacities are based on tests with grinding material of 80% of 0.8-mm undersized particles using the Overflow Type Rod Mill.
Because of this, the rod mill can effectively reduce 1″ feed size to 10 mesh or finer in open circuit. The voids (or interstitial space) within a rod load are approximately half those in a ball mill grinding load. Rods in place weigh approximately 400 pounds per cu. ft. and balls in place approximately 300 pounds per cu. ft..
The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters (10 feet) diameter inside liners, the top size of the balls used affects the power drawn by the mill.
Rod mills: Although rarely used in industrial practice, ALS has 2 x 2.3 kW rod mills for small (<50 kg/h) throughputs where preferential coarse grinding is advantageous for the …
The % fines in the rod mill feed. For the purposes of rod mill performance analysis, "fines" can be arbitrarily defined as particles finer than 75 microns (200 mesh). Rod mill feeds which contain less than approximately 10% fines are good candidates for fines addition testwork. The % solids by volume of the rod mill discharge.
A. as a rod, ball, or pebble mill. B. in open or closed circuit with cyclone or spiral classifier. C. as a wet or dry mill. D. as an overflow, grate, or peripheral discharge mill. E. available in various lengths as shown in table. F. in a variable speed range of approximately 67% to 80% of critical speed.
Rod Mills may be considered either fine crushers or coarse grinding equipment. They are capable of taking as large as 2″ feed and making a product as fine as 35-48 mesh. Of particular advantage is their adaptability to handling wet sticky ores, which normally would cause …
Samples of rod mill discharge (RMD) and cyclone overflow (COF) were taken from the grinding circuit of a Pb sulphide ore processing plant (note sampling points 1 & 2 as marked below). ... The following data show the results of particle size analysis for each sample along with Pb assay for each size class. a) Calculate the overall Pb assay for ...
Most are overflow discharge type. Length-to-diameter= 1.4 to 2.3. ... Rod mill power is dependent on mill capacity and work index. Mill power increases with: ... The optimum top size for a rod mill is defined by: …
Rod mills are widely used in various industries for their efficient grinding capabilities and ability to handle different types of materials. [Introduction]: Rod mill is a grinding equipment with steel rod as medium [Capacity]: 0.62～250t/h [Improvement]: TAYMA rod mills include overflow rod mill, end peripheral discharge rod mill and center peripheral …
File Size: 1261 KB Publication Date: Jan 1, 1978. ... Fig. 1 shows the cross section of an overflow rod mill, Fig. 2 an overflow ball mill, and Fig. 3 a diaphragm (grate) discharge ball mill. Mineral ore comminution is generally a feed preparation step for subsequent processing stages. Grinding, the fine product phase of comminution, requires a ...
The product size from a rod mill is much more uniform than a ball mill, but the overall size is much coarser. Hence, a rod mill generally precedes a ball mill in a grinding circuit, especially where a fine size product is required. ... A wet overflow rod mill was operated at 75% of the critical speed and found to draw 8.5 kW/t of rods when the ...
We believe the projects that we have executed speak for themselves. CITIC HIC has engineered and provided 6 AG mills of Ø12.2m×11m (28000kW gearless drive) and 6 overflow discharge ball mills of Ø7.9×13.6m (2×9000kW gear …
Xinhai has overflow rod mill, end peripheral discharge rod mill and central peripheral discharge rod mill to meet the various needs of customers. The rod mill is widely used in the artificial sand stone, ore dressing plant, chemical plant,etc. ... Even particle size of product, little over grinding. Product Introduction. The name of rod mill is ...
Circuit sampling results % -100 microns Stream Circuit (Rod mill) Feed Rod Mill Discharge Classifier Sands (Ball Mill Feed) Classifier Overflow Ball Mill Discharge 5 20 20 75 47.5 % solids by wt 80 80 75 33.3 75 Using the above data carry out a material balance and calculate: (a) the tons/hr of dilution water added to the rake classifier (b ...
The Ball and Rod Mill size we specialize in are: 600 mm X 1200 mm [ 24″ X 48″] = [ 2′ X 4′] ... where an approximate figure for the constant is 3.5 for rod mills, 4.0 for overflow ball or pebble mills and 4.5 for grate discharge ball or pebble mills. ç is specific gravity of grinding media (for rods or balls normally 7.85) ...
