#rod mill

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Rod Mill Market 2021 | by Trends Analysis | by Product Usability Profiles | by Forecasts to 2027

A summary of the Rod Mill market report The market analysis of the Rod Mill market provides a detailed market overview comprising statistically validated and checked by industry empirical results, forecasts, historical data, and market data. The report covers the concepts of the field and the description and function of the supply chain. The Rod Mill market analysis is an intelligent and…

Product introduction:https://www.lvssn.com/mill/

Jiangsu LVSSN company core cement epc

Rod mill is a kind of mill whose grinding body is steel rod.Selective crushing of coarse grains and selective protection of fine grains, can be used as a first class open-circuit grinding, widely used in artificial sand, concentrator, chemical plant, electric power and other departments of the first class grinding, product particle size uniform.There are three kinds of general rod mill: overflow rod mill, end side discharge rod mill, center side discharge rod mill.

1. How it works

Rod mill is asynchronous motor through the gear reducer and small gear coupling, turns around the big gear reduction, directly driven rotary rotary, barrel inner is equipped with the appropriate grinding medium - steel rods, grinding medium under the action of centrifugal force and friction force, to manufacture materials by feeding department continuously into the barrel inside, are controlled by the movement of grinding medium crushing, and the product through the power of the overflow and continuous feeding discharge outside, for the next working procedures.

2. Application scope

(1) in the heavy or magnetic separation plants of tungsten and tin ore and other rare metal ores, in order to prevent the over-crushing of valuable minerals, the over-crushing light rod mill is often used in the coarse grinding stage.

(2) in some cases can replace the short head cone crusher for fine crushing.When dealing with soft or not too hard ore, especially the ore with more slime and high viscosity, with a short head cone crusher, not only large dust and easy to cause the crushing machine block, if the use of a rod mill instead of crushing, can be 20-30mm ore grinding to 6-10 mesh, not only to reduce the cost, but also to simplify the fine dust removal.In this case, if the use of short head cone and screen closed grinding, the investment is both large, the fine blocking is also serious.For hard ore, it must be determined by comparing the method of rod mill or short head cone machine with sieve.

(3) when the rod mill is used for coarse grinding, the product granularity is 3-1mm, and the production capacity of the rod mill is larger than that of the ball mill of the same specification. However, when the rod mill is used for fine grinding, the grinding granularity is less than 0.5mm, the production capacity of the rod mill is not as large as that of the ball mill of the same specification.

Because of its small handling capacity and narrow application range, the rod mill is far less in demand than the ball mill. However, in some special cases, non-rod mill cannot be substituted.

Product introduction:https://www.cementepc.net/grinding/169.html

Jiangsu LVSSN company core cement epc

There are many reasons why the bar (wear-resistant steel bar) of the bar mill breaks. Today I simply list the following points for your reference:

1, bar mill steel bar (wear-resistant steel bar) less or more feed

The amount of rod mill steel rod (wear-resistant steel rod) is related to the height of rod mill steel rod (wear-resistant steel rod) being lifted and the impact times, impact force size and effective grinding area of the broken rock, which has a great impact on the production efficiency of the rod mill.The experimental results show that the filling rate of the bar mill (wear-resistant steel bar) is better at 40 ~ 45.But most domestic projects are below this range, a few are only about 30.Due to too little rod loading, the proportion of the throwing and dropping of the rod mill steel rod (wear-resistant steel rod) is also reduced correspondingly, and the production efficiency is reduced. The stones entering the mill cannot be broken to a finer degree in time and are rushed out of the mill by water, which can only be broken into coarse particles sandwiched in the rod seam and waiting for further crushing.In this way, the joints of the rods are often filled with stone debris, thus losing the constraint effect on the upper grinding rods, causing changes in the arrangement of the grinding rods.Too much feed, also easy to cause "indigestion" and cause the same results.

2, rod mill at both ends feed or add water is not equal

The bar mill used to make sand is generally end feed, end add water and the middle edge of the discharge.Obviously, the feed at both ends of the mill is not equal, easy to make the rod mill steel bar (wear-resistant steel bar) askew.When the axis of the feeding belt is vertically arranged with the grinding shaft, the deviation of the belt will lead to unequal feeding at both ends.When the two parallel layout, because of the stone movement inertia, it is more difficult to ensure the uniform feeding at both ends.If the feeder, which is shaken by the rocker arm, is used to feed the material to both ends of the mill alternately, the feeding at both ends will be artificially unequal, which can not only avoid the breaking of the rod, but also increase the chance of the skewness and fracture of the rod mill steel rod (wear-resisting steel rod).

If the water added at both ends is not equal, the discharge is not equal, the result is equal to the feed is not equal.special Is when grinding pebbles, because the pebble grains round surface light, easy to roll and bounce, add more water, one end of the pebble will be washed by water from the grinding end, or even directly discharged by the discharge port, resulting in one end of the material more, less material, making the rod mill steel bar (wear-resistant steel bar) aslant.

3. The feed grain size of bar mill steel bar (wear-resistant steel bar) is too large

The maximum particle size of continuous material depends on the size of rod diameter. A spherical pebble with a diameter of 25ram can fill the gap between two grinding rods of 100.If the stones size larger, and its 靭 sex is very good, will be difficult to break.They are blocked in rod joints and will cause the rod mill steel (wear-resistant steel) above them to lose the constraint of rod joints.Although the size of the feed is strictly controlled by sifting, the overdiameter phenomenon is always inevitable.As long as there is an overdiameter, the grinding rod may be askew.Using medium stone (maximum particle size of 40ram) to make sand, not to mention.

4, unqualified bar mill steel bar (wear-resistant steel bar) elimination is not timely

Rod mill steel rod (wear-resisting steel rod) wear to a certain extent, it is easy to bend and fracture bending rod and broken rod if not removed in time, will further cause other rod arrangement disorder.But the operator can not see the rod mill steel rod (wear - resistant steel rod).Fixed this, can not be found in time bending rod and broken, can only be regularly opened book mill inspection.Such checks are often an afterthought.At the same time, because the inside of the rod many, empty ask small, plus the rod mill steel rod (wear-resisting steel rod) bulky, want to completely clear has bent and broken, and will bend and fracture blind rod, is also very difficult.As a result, it often leaves some hidden dangers.

5, the rod mill internal parts fall off

Rod mill barrel is equipped with lining plate.The liner is fastened to the drum wall by bolts.Under the great impact of the grinding rod, the fastening bolt is easy to loosen and even be cut off, resulting in bolt and village Board fall off.Linings are large and not easily broken, and it is not difficult to imagine what will happen when they fall off.

During the operation of the rod mill, the parallel arrangement order of the rod mill steel (wear-resisting steel bar) is disturbed, which causes the rod mill steel (wear-resisting steel bar) to collide with each other, leading to the deterioration of the stress condition of the rod, which is one of the fundamental factors leading to the fracture of the rod.

Product introduction:https://www.cementepc.net/grinding/169.html

Jiangsu LVSSN company core cement epc

The grinding medium is a long round steel bar, which drives the movement by the cylinder body and works in the falling state. There is a lining plate in the cylinder body.Compared with other mills, the rotation speed and filling rate of grinding medium of the rod mill are relatively low, and the grain size of the ore should be limited, not too large, to prevent the large gap between steel rods, reduce the grinding effect, and prevent the steel rods from tilting and breaking.The ore is crushed and ground under the action of the line contact produced in the process of medium dropping. The bulk ore is first ground to fine. The small ore is easy to pass between the steel rods and is rarely impacted by the medium.

At present, our country generally only the production and use wet rod mill, contains the overflow, open mouth and the surrounding three categories, the overflow type most widely used, namely the center row ore type rod mill, multi-purpose in a open circuit grinding finely and coarse grinding, to process the minerals disseminated extent uneven or disseminated extent relatively coarse ore, if need to use the rod mill instead short head cone crusher, rod milling opportunities applied to finely, in daily production, rod mill coarse grinding is the most common, mineral processing, high production efficiency, especially suitable for use in brittle mineral processing, applied in the rare metal mine mineral separation is very much,But it is not usually used in mines of single precious metal.

The grinding operation is the most important operation link of the mill, the energy and cost consumed by the mill account for the vast majority of the energy and cost consumed by the mill, so it is very important to carry out the energy saving and consumption reduction work of the mill.As an important grinding equipment, the improvement of its performance and technology has become an important subject for technicians..