250 300tph complete crushing plant
  • Name :250 300tph complete crushing plant
  • Features:Simple structure, easy maintenance
  • Application:Jaw crusher is widely used in various
  • Contiguous item:Feeder Screen Washer
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250 300tph complete crushing plant

In the crushing section, the ore as it comes from the mine is broken down dry to a size suitable for the wet grinding machines ; these can, if necessary, be made to take lumps of 2-in. size, but they work much more efficiently if their feed is ½ in. or less. Before the advent of the Symons cone crusher the usual practice was to make a 2-in. product in two steps consisting of a primary breaker of the jaw or gyratory type followed by a secondary gyratory crusher. If anything smaller were desired, a third stage was added comprising coarse crushing rolls in closed circuit with a screen. The Symons cone crusher, however, will take the discharge of the primary breaker and crush it to 3/8-in. size in one pass more cheaply and efficiently than is possible with rolls. A screen is usually placed ahead of the cone crusher in order to bypass material that is already small enough and so to relieve it of unnecessary work, but there is no necessity to screen the discharge, as must be done in the case of rolls; the crushing elements are so designed that the finished product is made in one pass through the machine.

Modern practice, then, is to crush the ore as it comes from the mine in two steps to a maximum size of ½” without the use of water except as a spray to remove dust. Three stages are only needed if the primary machine is called upon to take lumps of exceptional size, such as are encountered when mining is done by power-shovel. Since this material is very difficult to handle through a bin gate, it is usual to feed it direct to a specially large preliminary crusher, often of the jaw type, which breaks the ore to a size small enough to enter the normal primary crusher.

Crusher Plant Layout

Most crushing plants are now designed on the lines shown in Fig. 1, which is a diagrammatic view of a two-stage arrangement.

The ore from the mine is dumped in the coarse ore bin, from which an automatic feeder delivers it over a grizzly to the primary breaker, the latter being of the jaw type in the case of a small plant and of the gyratory type in the case of a large one. The reduction ratio—that is, the ratio between the “ inch size ” of the largest lump entering the machine and that of the largest piece leaving it—is usually between 4 and 6 to 1 for either machine.

The undersize of the grizzly joins the product of the primary breaker and is transported by a belt conveyor to an intermediate bin, from which an automatic feeder delivers it to an elevating belt conveyor discharging on to a vibrating screen. The screen by-passes any material fine enough to enter the grinding section and delivers the oversize to a cone crusher, the discharge of which joins the undersize of the screen and is taken by a belt conveyor to the fine ore bin ahead of the grinding section.

The fine ore bin can be designed to hold two days’ supply of ore, but the coarse ore bin should not hold more than one day’s supply on account of the tendency of large lumps to pack under pressure of a heavy column of ore. The intermediate bin with the automatic feeder and belt conveyor following it are occasionally omitted, but the practice is not to be recommended, since the discharge of the primary breaker then passes straight to the vibrating screen and cone crusher, with the result that the unavoidable irregularities of feed in the first stage pass on to the second ; moreover, the correct rates of feed for the primary and secondary machines are seldom the same. Therefore, as a cone crusher can only be run at maximum efficiency if it is given a regular feed at approximately the correct rate, it is best in the interests of efficiency to retain the intermediate bin.

A group of several automatic feeders at intervals along the length of the bin are sometimes required to keep the larger sizes of gyratory crushers running at full capacity. The layout of a large installation, especially one with several primary breakers, is consequently not always quite as simple as the foregoing description would indicate on account of the greater complexity of the conveyor system. The usual method of handling the ore is to arrange for each group of feeders to discharge on to one particular apron conveyor running parallel to the bin under the projecting ends of the feeders; the conveyor in turn discharges on to a belt conveyor which elevates the material to the appropriate primary crusher. It should be understood that the limiting factor is the maximum possible height of the bin ; an automatic feeder can be made big enough to supply the largest crusher, but it is not always possible to provide sufficient bin height to give the necessary storage capacity over a single feeder. A longer bin with a greater number of feeders is therefore the usual alternative.

For three-stage crushing, the preliminary stage is frequently a duplication of the first step of the two-stage arrangement shown in Fig. 1, but it is not uncommon for the first machine to be placed near the scene of mining operations if the mine is situated at a considerable distance from the flotation plant.

Complete Stone Crushing Plant introduction:

SBM manufactures various equipments for a Complete Stone Crushing Plant, and provides complete technical support for customers from line design, ground drawing, installation and commissioning etc.

The Complete Stone Crushing Plant consists of vibrating feeder, jaw crusher, impact crusher, vibrating screen, belt conveyor, electric control, etc. We design different production lines ranging 50 t/h to 500 t/h by combining different models of equipment which can match cone crusher, de-duster, etc.

Complete Stone Crushing Plant working principle :

Big materials are fed to the jaw crusher of high returns artificial sand production line evenly and gradually byvibrating feeder through a hopper for primary crushing. After first crush, the material will transferred to impact crusher by belt conveyorfor secondary crush; the crushed materials will then transferred tovibrating screen for separating.This step is very important in high returns artificial sand production line. After separating, the parts that can meet standard will be transferred away as final products, while the other parts will be returned to impact crusher, thus forming a closed circuit. Size of final products can be combined and graded according tocustomers specific requirement. We can also equip dust catcher systemto protect environment.

Complete Stone Crushing Plant application :

Complete Stone Crushing Plant are widely used in mining, metallurgy, construction, hydropower and chemical industries etc. To materials, it can be used to crush many kinds of stones, such as the basalt quartz, granite, limestone and sand gravel, etc. Also include the ore materials such as gold ore, manganese ore, iron ore, bauxite, copper ore and coal, etc. At the same time, PE jaw crushers are also applicable for recycling construction waste, slags.

Aggregates crushing, screening and stocking plants

SBM can supply a complete range of equipment and “turnkey” plants for the aggregates crushing, screening, conveying and stockpiling.

In these last years also the recycling of aggregates has gained a considerable role. The processing of recyclable waste materials coming from roads and construction/demolition sites such as asphalt, concrete, bricks is part of an overall policy shared by the several operators dealing with the environment: it combines the public authorities’ requirements for environmental protection with the aggregates producers’ financial needs.

Machines and fixed, semi-fixed and mobile plants for the aggregates treatment and recycling

Concerning to the aggregates recycling, our factory can supply - in additional to the stationary and semi-mobile plants – also mobile units that are more required for their extreme compactness and their big use flexibility . The plant engineering solutions can be stationary or semi-mobile type – suitable for big productive power – or mobile type on tracks, on tyres and on skids, equipped with crushing and/or screening units.

Equipment for the aggregates crushing and screening

SBM can supply a wide variety of equipment in order to cover the whole range of products requested for the aggregates processing:

Feeders of diffrent design: vibranting, trolley-mounted, grizzly, track-laying and disk rough grading

Jaw crushers for primay and secondary applications

Impact crushers with possibility of configure structure and rotor for primary, secondary and tertiary applications;

Vertical shaft impact crushers adjustable to get a multipli city of products

Cone Crushers with multiple configurations to get product with polyhedric shape

Vibrating screens tilted and horizonthal to satisfy every demando f selections

Belt conveyors mudular for great variety of configurations

Rod mills for the aggregates crushing