130--200tph building waste crushing plant-sbm industrial technology group
After multiple investigations, the customer chose SBM's portable crusher plant for the treatment of solid building wastes. The production line was designed to produce gravels and stone powder with capacity 130-200TPH. Currently, the operation runs stably and the production line becomes the model of solid building waste treatment in local areas.
The solid building materials are sent by vibrating grizzly feeder where the grizzlies can pre-screen them. The fine materials are sieved out and transported by belt conveyor while large blocks of materials enter PFW1214II Impact crusher evenly and after the wastes are crushed into the particles meeting the discharging standard, they would be sent by belt conveyors. Because the customer needed mixed materials, we didn't equip screens for him.
The project was designed by SBM which took the advanced K Series Mobile Crushing Station. This equipment can avoid unnecessary investments. Compared to the fixed production lines, K Series Mobile Crushing Station is characterized by short construction period and flexibility, reducing investment risks and avoiding demolition. Besides, its excellent value-holding capability can help investors start another new project quickly on the one hand and reduce investment costs by selling it for money on the other hand.
crushing & screening plant design factors
Crushing Plant Design and Layout ConsiderationsCrushing Circuit A shows a small simple layout for use in mills up to 100 tons. In order to keep the flowsheet simple, and because of the use of the forced feed type of crusher, we can crush small tonnages up to 100 tons per day with a very simple arrangement; using a stationary or vibrating grizzly ahead of the crusher and then crushing the oversize before conveying into the fine ore bin. Elevators are often used for this purpose but are not recommended on very sticky ore.
In Crushing Circuit A the chute leading from the stationary or vibrating grizzly should be steep, for wet, sticky ore will build up if there is not a nearly vertical drop on to the conveyor. If the bottom of the conveyor is in a pit, plenty of room should be allowed in back of the tail pulley for the mill operator to shovel if necessary. A drain should be provided in case of floods or spills in the mill. The conveyor should not be placed at an elevation of more than 20 degrees. The fine ore bin should preferably be a deep bin in which storage capacity for at least a 36 hour supply of ore should be provided. In other words, for a 100 ton mill, this fine ore bin should have a capacity of at least 150 tons.
Crushing CircuitB shows the use of a secondary crusher for handling larger tonnages. The type of secondary crusher will vary according to the characteristics of the ore. Usually a cone type crusher is recommended for this secondary crushing, although in many cases a jaw crusher can be used as the secondary crusher, setting up the jaws closer than in the primary crushing operation. The interchangeability of parts is important if the two crushers are of the same size. The jaw crusher is the simplest and most fool-proof of secondary crushers. Rolls are often used where the shearing action of a roll crusher and a minimum amount of slimes are desired. However, rolls ordinarily should not be used to produce a feed finer than 1/8 and a reduction of 4 to 1 should be the maximum between the feed and discharge. Rolls have often been condemned because of the use of too small diameter rolls, cheap and poorly designed units.
For larger intermediate crushing the well-known cone gyratory crushers are recommended. Crushing Circuit B shows the use of a secondary cone crusher in the circuit between the primary crusher and the fine ore bin. A vibrating screen removes the undersize before the feed enters the secondary crusher. On small- tonnage plants, particularly on a steep millsite, this FLOWSHEET B is highly recommended, for both the primary crusher and the secondary crusher can be kept in a building in close proximity to each other.
Crushing Circuit C shows the modification of Crushing Circuit B where a light-weight, secondarycrusher can be placed over the fine ore bin. Oftenthe fine ore bin is strong enough, together with additional steel supports, to make this simple arrangement practical.
Crushing Circuit D shows a very practical arrangement even for large-tonnage plants, enabling both theprimary crusher and the secondary crusher to be inthe same crushing building and to utilize the minimum amount of conveying. There is a great deal ofmerit to this crushing layout D, for the same conveyor belt can handle the products from two crushersand thus the minimum amount of conveyor equipment and building space is required. In most instances this crushing arrangement D will prove tobe most practical from the first cost as well as from anoperating point of view.
Crushing Circuit E was at one time the most common arrangement for a crushing plant in which largetonnages were handled. This arrangement was recommended where compactness and space were not asimportant factors as under the arrangement D.Crushing CircuitE covers the fundamental factors ofa good crushing plant if floor space and expense arenot critical.
In all of the above Crushing Circuit flowsheets we recommend amagnetic head pulley or a permanent magnet aheadof the secondary crusher to remove injurious magneticmaterial, particularly the detachable drill bits whichare now becoming so common in many of our miningoperations.One can readily see the importance of this magnetic protection, particularly since in many mines the throwing down of worn out drill bits is an every-day occurrence. The removal of the fines from the crushed material before each crushing stage is also a very important step in good crushing practice.
This flow diagram shows a three-stage gravel plant schematically. It shows the interrelationships and functions of the various components of the plant. This sort of diagram can be used to advantage in working out the solution of an aggregate plant problem.
We should consider how the work is done by crushing machines, hammermills and pure impact crushers lift the kinetic energy of the material to a level where on sudden impingement against a stationary plate breakage occurs.
These two cone crushing configurations are commercially available and have entirely different concepts of the amount of ore being crushed as a proportion of the total feed, for the example shown (fig, 2), we are comparing two machines engaged in fine crushing with feed top size of 30 mm. This shows the smaller eccentric throw, longer chamber crusher can be expected to make a finer product at the same close side setting compared to the larger throw, short chamber machine, this is because it is working on a greater proportion of the feed, for further discussion, i will define this ability to inject energy per unit of feed as the power rate of the crusher.
you will notice from these results that in each case crushers 2 and 3, with the smaller eccentric throws, made a higher percentage of finer products even though in the case of crusher 3 the close side setting was 40 percent more open.
Dividing the power consumed by the tons of size produced gave remarkably similar power per ton figures, results from other tests on other sized crushers processing many different materials seem to confirm that cone type crushers use the same energy to reduce similar quantities of material to the same size. The efficiency in the application of energy converted to useful work by the crusher, therefore, appears independent of eccentric throw.
The only variables in the process which we can control routinely are feed rate and setting change to the crusher. These affect the power consumed at the drive motor and rate of energy input as follows.
At fixed settings (fig 5) near the point of economic operating capacity, feed rate versus power drawn has a linear relationship. Power rate tends to remain a constant.With variable setting, power changes in an exponential relationship (fig 6).
This example shows that for a very small change in setting there is a big change in power drawn, because for a small change in setting there is little volumetric change there will also be an exponential relationship in crusher setting versus energy per ton of feed (power rate) which is a direct measure of reduction, as is shown in fig, 7.
It should be obvious that if we can change the setting of the crusher whilst it is operating, we can affect both the productivity (consumed power) and, through the power rate the amount of reduction within the constraints set by the eccentric throw, speed and chamber configuration,
An important point which is often overlooked by plant design and application people is that the crusher must have an adequate amount of evenly distributed feed, fig, 8 shows the effect of poor and good feed distribution. If the feed is right the crusher will have maximum productivity (highest average crushing force) for minimum mechanical stress, a crusher cannot normally be fed properly from a vibrating screen discharge, this is why we have shown surge bins with pan or belt feeders in the diagrams that follow on plant discussions.
recycling crusher - rubble master
In 1991, RUBBLE MASTER created a new market: on-site recycling! The sheer variety of the reusable material is just as far-reaching as its scope of use in new building projects. With our compact mobile crushers and screens, recycling is an interesting and lucrative business for every company.
Instead of having to transport concrete, C&D waste, asphalt or reinforced concrete away from sites and take it to tips, our crushers turn it into reusable building materials immediately. Directly on site. Nothing could be better for the environment or for your budget.
Recycling C&D waste directly on-site and using it immediately as backfill for sewer trenches or around basements really pays. With the flexible and quiet RM crushers you can work anywhere from small building sites in the city to noise-sensitive residential areas.
Even in the heat of summer, an RM mobile crusher effortlessly processes waste asphalt into cubic final grain. Because huge quantities of waste asphalt are produced every day, companies can discover a lucrative new business in recycling asphalt. Here you will find examples of users who more than profit from recycling.
Extreme versatility is critical for us: railway sleepers are another challenging material that is recycled in no time by RM crushers to form value grain. Every material that you process comes out of the crusher as cubic final grain. That is how coal is often processed, for example, in some regions of Europe.
The special crushing method used by our mobile crushers makes an RM Compact Crusher ideal for industrial waste and versatile applications. Glass, slag, brick and ceramics are quickly turned into a new recycling material that can be used in so many ways.