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lizenithne plants primary crusher

primary crushing

primary crushing

The term primary crusher, by definition, might embrace any type and size of crushing machine. The term implies that at least two stages of crushing are involved, but in many cases the machine which performs the function of initial crusher is the only crusher in the plant. The factors influencing the selection of a crusher for this service are much the same, regardless of how many crushing stages there are in the flowsheet; therefore, the term primary crusher, by common usage, is applied to the crusher which takes up the job of reduction where the blasting operations leave off. Selecting the right type and size of primary crusher is a problem of prime importance in the designing of a crushing plant of any nature and size. Usually this machine is the largest and most expensive single item of equipment in the plant; a mistake in the choice can only be remedied fully by replacement; and, because the entire primary crusher-house arrangement is generally tailored.to fit the crusher, such .replacement is almost always a costly procedure. While personal favouritism toward some particular type of crusher may safely be allowed to swing a close decision, it should never blind the engineer or operator to the merits of other types, nor to the limitations of his favorite. The following factors all have a more or less important bearing upon the choice of the primary crusher.

The first three of these factors will almost always be ascertainable at least to a close approximation before the matter of crusher choice is taken up. Sometimes, as when a new crushing plant, or a new primary crusher set-up, is to be installed at an existing operation the last three factors will be pre-established. Otherwise, it is sound practice to consider them as a part of the problem of crusher selection. The primary crushing setup is closely linked to the quarrying or mining operation, and it is only by careful adjustment of all equipment selections to the general plan of operation that optimum operating results may be realized.

While it is convenient to discuss the influence of these several factors separately, it is well to keep in mind that they are more or less closely interlocked, and that a change in one of them may necessitate altering one or more of the others.In addition to the factors listed there are usually a few which are peculiar to each individual problem such as labor costs and so on. Any plant design problem is an economic as well as an engineering one. We are concerned here ,chiefly with the engineering phases.

Characteristics of the material to be crushed include the geological classification of the rock, its physical structure, its chemical analysis (at least so far as abrasive constituents are concerned), and at least a qualitative evaluation of its resistance to crushing that is, whether soft, medium, hard, or very hard and tough. Frequently such information may be obtained from contiguous deposits which are being operated; sometimes the values must be arrived at by laboratory tests. It is never safe to make blanket assumptions, even on such a material as limestone, which can sometimes prove to be quite tough, as well as to contain significant amounts of abrasive silica.

Physical, or geological, structure of the deposit often has an important bearing upon selection of size or type, or both. If the deposit is thinly stratified, as, for example, many deposits of limestone are, it is safe to assume that the rock can be blasted economically into a condition for feeding a gyratory crusher of medium proportions, or, if other characteristics are suitable, a sledging roll crusher, such as the Fairmount machine. If, on the other hand, the formation is of massive character, again, some limestones are, the gyratory crusher might be ruled out in favour of the jaw crusher, unless the operation is of sufficient magnitude to warrant installation of a large size of gyratory. The proposed quarrying or mining procedure will of course have some bearing upon the size of rock to go to the crusher, regardless of its physical structure, as will be pointed out in further detail later on. If the chemical analysis of the rock discloses that substantial amounts of free silica or any other abrasive are present, crushers of the sledging roll or hammermill types are usually ruled out unless the material is extremely soft and friable. There are occasional speciality applications where such machines may be indicated for crushing abrasive materials, but from the standpoint of, economical operation their use for such service is rarely justifiable. The same restriction holds true for hard and tough materials. For such rock or ore our choice of a primary crusher is restricted to the gyratory and jaw types except, again, for the occasional specialty application where economy in maintenance may be sacrificed for other considerations such as lower first cost, or space restrictions.

The significance of this factor is so obvious that it sometimes does not receive quite as much thought as it should. From the standpoint of minimum requirement, it is of course closely tied up with product size, or crusher setting. But the primary crusher can seldom be chosen solely on the basis of capacity; it should never be selected with a view to just meeting the average capacity required to feed the rest of the crushing plant. Just how much the rated capacity of the primary crusher (at the required discharge setting) should exceed the average capacity of the plant depends upon how uniformly the crusher will be fed; or to put it more definitely, what percentage of the total operating period the crusher will operate at full rated capacity. The answer to this is not always an easy one to predetermine, as it may depend upon several details of plant design and quarry operation.

In the average quarry operation, the only surge capacity between the quarry and the primary crusher consists of whatever quantity of rock may be, at the moment, loaded in cars or trucks, and usually this is not large. For that reason, any operating delays occurring in loading, transportation or primary crushing quickly affect all three of them, with the result that the feed to the balance of the crushing plant is cut-off until the trouble is rectified. If the plant as a whole is to maintain its rated average output, these departments must be capable of making up for such interruptions, and they can only do this if they have reserve capacity over and above the average requirement.

Such interruptions to continuous production are not uncommon in the primary crusher house; they may assume serious proportions if the crusher receiving opening is not large enough for the material it is expected to handle, and the largest crushers of any type will occasionally bridge or block. Crusher capacity tables are predicated upon a continuous feed of rock of a size that will readily enter the crushing chamber; it is obvious therefore that a crusher whose rating just equals the average plant requirement would have no reserve to compensate for the conditions we have outlined. For the average quarry operation this reserve should be not less than 25 percent, and preferably about 50 percent.

Since the minimum dimension of the feed opening of a crusher determines the maximum size of lump that it can take, the choice of a primary breaker is dependent as much on the size of the feed as on the hourly tonnage. Thus a 15 in. by 24 in. jaw crusher would be suitable for a small mine hoisting 300 tons in eight hours from underground workings from which lumps larger than 14 in. are not likely to be received. A crusher of these dimensions will break 40 tons per hour to 2-in. size with a power consumption of 30 h.p. On the other hand, a 14-in. gyratory crusher, working as it should at full capacity, will crush 100 tons per hour to the same size with a power consumption of 70 h.p. ; at 40 tons per hour, it would still require about 50 h.p. The jaw crusher is evidently the more economical machine in this case, and its first cost is only about half that of the gyratory crusher.

If the capacity of the primary breaker is required to be 100 tons per hour or over, a gyratory crusher is likely to be more economical than the other type, since it costs no more than a jaw crusher of similar capacity and consumes less power. Moreover, the difference in power consumption between the two types of machine is greater in practice than in theory; this is due to the fact that, since the gyratory crusher can be choke-fed, it is easier to keep it running at maximum efficiency.

The position is different when mining is done by power-shovel. The maximum size of lump delivered to the crushing plant is much larger than from underground workings, and it is not advisable to use a bin for the storage of the ore on account of the difficulty of handling very large lumps through a bin gate. Consequently the ore is generally sent direct to a preliminary breaker which reduces it to a size suitable for feeding the normal primary breaker. The first machine is often of the jaw type, although this depends on the circumstances. Suppose, to take an instance, that the shovels were equipped with 3-yd. dippers and that 2,000 tons were being mined per day. A 48 in. by 60 in. jaw crusher is more than large enough to take the maximum size of lump that could get through the jaws of the dipper, and it would break the whole days output to 6-in. size in eight hours with a power consumption of under 200 h.p. On the other hand, a 42-in. gyratory crusher, which is the smallest that could be installed with safety, has a maximum capacity of over 5,000 tons in eight hours with a power consumption of about 275 h.p. The jaw breaker would therefore be the more economical machine. It could, if necessary, be installed near the scene of mining operations, and would be set to deliver a 6- or 8-in. product, which could be conveniently transported to the crushing section of the flotation plant where it would be fed through the coarse ore bin to the primary breaker in the ordinary way.

The choice of a primary breaker is an individual problem for every installation. The type of mining and the regularity, size, and rate atwhich the ore is delivered, are the main determining factors, but all local conditions should be taken into consideration before a decision is made.

what is primary, secondary, and tertiary crushing? - eagle crusher

what is primary, secondary, and tertiary crushing? - eagle crusher

The crushing market caters to a wide range of material processing industries, like aggregate, asphalt, and concrete and demolition recycling, that handle an even wider range of materials, including limestone, concrete, and gravel, among many others. Yet, all crusher...

As the summer months arrive in North America, operating portable crushing and screening plants on a job site outdoors can become more demanding as exposure to high temperatures introduce new safety hazards to team members. Dangers that are inherent to hot weather like...

From horizontal shaft impactors to jaw crushers, Eagle Crusher manufactures some of the toughest and most powerful crushing equipment on the market, empowering producers to conquer any size crushing project. Not only that, but Eagle Crushers team of engineers...

On a crushing job, every machine and piece of crushing equipment works together to contribute to the success of production. However, it is necessary to recognize that certain components of equipment like portable plants should require extra care to achieve that...

Striking the right balance between producing a quality aggregate product and maximizing operational efficiency is a familiar challenge on any crushing site. To achieve harmony, the right equipment needs to be set up and configured to account for any variables that...

Eagle Crusher Launches New Company Website Eagle Crusher is pleased to announce the launch of our new company website that is designed to better help users find the right crushing and screening products for their operations. An industry leader for more than 100 years,...

Portable crushing and screening plants are engineered with the safety of its operators and others in mind. Just as well, potential safety hazards like pinch points and finger injuries can be prevented on the job site by properly training team members and following...

The most effective crushing operations are often complemented by an appropriate configuration of screening plants and systems that can best sort and stockpile the material being processed as efficiently possible. Eagle Crusher manufactures a comprehensive range of...

In the crushing business, abrasive materials like aggregate, concrete, and asphalt can wear away at vital components across the production line. While these components are manufactured to withstand steady wear, they will require upkeep. As the entry point for the flow...

Portable plants and other crushing equipment can come in many shapes and sizes depending on the needs of a producer. Just as integral to a crushing operation as an impactor or jaw crusher are the screens being utilized to sort product. With so many options and...

There are many ways to crush a rockand depending on your industry, your location, and the project specifications, the equipment that you use and the layout by which it crushes that rock is often rather unique, especially when it comes to product size.

The degree to which material is reduced through stages of primary, secondary, and tertiary crushing can depend on the type of material, like aggregate, concrete, and asphalt, and can also depend on the variety of output sizes needing produced.

Primary crushing is the first stage of material reduction and can sometimes be the only stage needed to generate the desired product for a job. Depending on the setup, primary crushing will take the larger material that has been blasted, excavated, or reclaimed and process it through an impactor, jaw, or gyratory crusher to generate a range of product sizes.

For many aggregate producers, utilizing a closed-circuit portable crusher plant with scalping and screening capabilities can be all they need to create the product they need. But when a wider variety of product is desired and certain material is being processed, like concrete and asphalt, it can be valuable to rely on additional stages of crushing, like secondary and tertiary.

Secondary crushing, as you can imagine, is the second stage of material processing following its initial reduction. At this stage, material will flow through perhaps a second impactor or even a cone crusher, which is effective at breaking down these types of material.

There are also tertiary and even quaternary stages of crushing that exist to achieve the finer levels of material reduction. These stages in addition to secondary crushing can often be laid out utilizing an open-circuit portable crusher plant system where processed material is screened and conveyed from one crusher to the next.

Relying on these many stages of crushing beyond only primary can add great value to a crushing operation. Not only can multiple sizes of product be generated, but often in an open-circuit crushing layout, the flow and processing of material is streamlined and can increase output when compared to a closed-circuit crushing layout.

Eagle Crusher offers a comprehensive portfolio of closed-circuit and open-circuit portable crusher plants alike, manufacturing powerful equipment like horizontal-shaft impactors, jaw crushers, and cone crushers that are critical for any stage of crushing. When you speak with a Team Eagle representative, we can help you determine which crushing equipment will be best for your next project.

The crushing market caters to a wide range of material processing industries, like aggregate, asphalt, and concrete and demolition recycling, that handle an even wider range of materials, including limestone, concrete, and gravel, among many others. Yet, all crusher...

As the summer months arrive in North America, operating portable crushing and screening plants on a job site outdoors can become more demanding as exposure to high temperatures introduce new safety hazards to team members. Dangers that are inherent to hot weather like...

From horizontal shaft impactors to jaw crushers, Eagle Crusher manufactures some of the toughest and most powerful crushing equipment on the market, empowering producers to conquer any size crushing project. Not only that, but Eagle Crushers team of engineers...

On a crushing job, every machine and piece of crushing equipment works together to contribute to the success of production. However, it is necessary to recognize that certain components of equipment like portable plants should require extra care to achieve that...

Striking the right balance between producing a quality aggregate product and maximizing operational efficiency is a familiar challenge on any crushing site. To achieve harmony, the right equipment needs to be set up and configured to account for any variables that...

Eagle Crusher Launches New Company Website Eagle Crusher is pleased to announce the launch of our new company website that is designed to better help users find the right crushing and screening products for their operations. An industry leader for more than 100 years,...

Portable crushing and screening plants are engineered with the safety of its operators and others in mind. Just as well, potential safety hazards like pinch points and finger injuries can be prevented on the job site by properly training team members and following...

The most effective crushing operations are often complemented by an appropriate configuration of screening plants and systems that can best sort and stockpile the material being processed as efficiently possible. Eagle Crusher manufactures a comprehensive range of...

In the crushing business, abrasive materials like aggregate, concrete, and asphalt can wear away at vital components across the production line. While these components are manufactured to withstand steady wear, they will require upkeep. As the entry point for the flow...

Portable plants and other crushing equipment can come in many shapes and sizes depending on the needs of a producer. Just as integral to a crushing operation as an impactor or jaw crusher are the screens being utilized to sort product. With so many options and...

primary crusher, primary crushing plant - all industrial manufacturers - videos

primary crusher, primary crushing plant - all industrial manufacturers - videos

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... mobile impact crusher is the most versatile and cost effective mid-sized unit on the market. Fitted with the CI411 Prisec impactor, this unit can operate in both primary and secondary applications.This ...

Sandvik QI441 mobile impact crusher is a pioneering solution offering primary and secondary crushing in one unit. Maximum productivity and efficiency in a single investment.This mobile impact crusher ...

... been designed to combine the ability to configure one base crusher into either a primary or a secondary configuration, enabled by the all new patented and highly modularised Sandvik CI521 crusher. ...

Liming Mobile Primary Jaw Crusher KE750-1 is a mobile crushing equipment for coarse crushing. The whole machine includes four systems: feeding, screening, conveying and crushing. The crushing ability ...

PE600900 jaw crusher is used in the first process of coarse and medium crushing various minerals and rocks. The advantages of high efficiency, strong crushing capacity and low investment cost make jaw crusher ...

PE7501060 jaw crusher is used in the first process of coarse and medium crushing various minerals and rocks. The advantages of high efficiency, strong crushing capacity and low investment cost make jaw crusher ...

FABO PRO 150 is a mobile type & closed circuit crushing plant model that is suitable for almost all types of stones except those which's hardness level is too high. Technical Specifications : Production Capacity ...

Characteristics Mobile jaw crusher from the new EVO generation with diverse possibilities of use, ideal for requirements in the Contractor area. The jaw crusher has an inlet opening measuring 1,100 ...

Characteristics Mobile jaw crusher from the new EVO generation with diverse possibilities of use, ideal for requirements in the Contractor area. The jaw crusher has an inlet opening measuring 1,100 ...

Primary impact crushers are preferred for their high performance and high reduction ratios in crushing soft-character substances like gypsum and limestone. Due to the different principle of crushing these ...

... mobile crushing plants are used to process concrete, asphalt and other demolition debris, not only to recover useful construction aggregates, but also to reduce transport and landfill costs. GEP Ecotech's mobile jaw crushers, ...

Jaw crusher is a unique machinery applicable for all types of stones starting from the softest one and ending with the hardest one. This type of crusher can be used as in the first stage of crushing, ...

CONSTMACH JAW CRUSHERS are designed to be able to handle initial crushing process of any type of material from the softest limestone to the hardest granite. CONSTMACH Jaw Crushers are used as the first ...

... Sizer from FLSmidth, that is exactly what you get. Throughout the world, ABON Low Speed Sizers have been commissioned in Primary, Secondary, Tertiary and Quaternary applications across the minerals range, with installation ...

The Terex Finlay J-1170 is a compact and aggressive tracked jaw crusher. The heartbeat of the machine is a robust hydrostatically driven Terex jaw chamber which provides high capacity with large reduction ratios. The ...

... today. It was engineered to deliver heavy-duty, multi-purpose applications. It has been designed with an integrated main crusher mechanism, capable of accepting any type of material/element fed into it in order to create ...

... impact crushers are designed for high volume and high reduction ratio impact crushing. They are particularly suitable for limestone. They are also suitable in applications where typical compression crushers, ...

... Trio CT series jaw crushers are robust machines. Their rugged construction, combined with innovative features, make the Trio CT series jaw crusher the clear choice for primary applications. Overview Our ...

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