Crushing, Screening & Conveying

Crushing, Screening & Conveying 2017-04-04T06:57:13+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Crushing.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Maximize Jaw Crusher Liner Wear life (7 replies)

Tony Verdeschi
2 years ago
Tony Verdeschi 2 years ago

Ensure that the jaw chamber is choke fed. The level of material in the jaw should just be below the jaw stock deflection plate. I wonder how you extend the life of jaw liners And Reduce volume of fines and wet material entering the crusher.

Zander Barcalow
2 years ago
Zander Barcalow 2 years ago

Jaw liners are normally Mn-steel liners with 12-14 % Mn to withstand impact and abrasion resistance. With proper selection and design of the system, life of jaw plates may be enhanced. Preferably discharge height should be optimum and jaw lines should be such that it can be repositioned so that the wearing of jaw plate s more uniform before discarding.

Alan Carter
2 years ago
Alan Carter 2 years ago

Apart from the steps mentioned above as impact is one of the prime reasons for reduction in jaw life, the provision of a thick, replaceable deflector plate can protect the top of the moving jaw from the impact of the feed material and thereby extend life of the jaw plates.

Jean Rasczak
2 years ago
Jean Rasczak 2 years ago

The material and the process procedure of the material are the most crucial points.

Maya Rothman
2 years ago
Maya Rothman 2 years ago

Is there proper jaw plate design to allow choke feeding without bogging a jaw crusher?

Sugar Watkins
2 years ago
Sugar Watkins 2 years ago

There are various designs available for the profile and teeth on the Jaw designed to make it grip and pull the material through the jaw. for example, you do get for example 'bellied' jaw liners which push the choke point higher up the chamber, very useful when you have a lot of mid-range material in the feed, as more crushing takes place in the middle of the jaw chamber instead of at the toe end. A bellied liner is shaped more like a bow with the center stick out rather than flat like most jaw liners.

Picking the correct profile can be a case of trial and error, and can include having different Swing and Fixed Profile liners in the Jaw to find the sweet spot in terms of performance and wear. Have some pity on the liner suppliers, most companies will stock the top 2 liner profiles which fit 80%-90% of applications, if you require specialized liners you may have to carry the additional stock yourself and order well in advance.

One of the main reasons I find for the jaw 'bogging' (If I understand you correctly) is the nip angle. The Nip Angle is the angle of the V between the swing and fixed liner. The CSS that the jaw is set at has a great influence on the Nip Angle and performance of the Jaw.

What tends to happen is that some manufacturers try to give you a very large feed opening and claim you can close the jaw down very small. Even a well-designed Jaw that is closed past it's recommended CSS will have the same problem. The larger the nip angle, the more the crushing force is directed upwards instead of inwards. The result is that instead of squeezing the material between the two jaws, the material tends to float inside the chamber. This forces all the crushing to take place at the toe end of the liner, slows down production, increases wear significantly as the material is constantly rubbing up and down on the liners, and will most likely lead to early bearing failure in the medium term.

Having too small a nip angle will provide its own problems.

You'll find on the better jaw designed, the larger the feed opening (i.e. it accepts a larger feed size), the longer the chamber will be so that a good nip angle can be maintained.

This is one of the main reasons I try advice to always spec the Jaw to match the performance of the rest of the plant. Having an oversize jaw can be/is counterproductive to operations in so many different ways.I hope I understood your question correctly, I know the question was more about the liner design, but personally I believe the nip angle is a more common problem and has a greater effect on production.

Victor Bergman
2 years ago
Victor Bergman 2 years ago

Depending on hardness of the ore crusher designs change. Jaw is not suitable for granite type rocks. Use gyratory crushers. If jaw is used bear with the liner wear. It is normal. Or go for a higher capacity jaw crusher.

11 months ago
(unknown) 11 months ago
1 like by David

As a manganese casting engineer, I share my ideas about the wear life.

  • The hardness of material which you crushed, it is the most important figure! Most of jaw plates are manufactured by high manganese, Mn14, Mn18 and Mn22 . Different material suit for different hardness!
  • The microelement in jaw plate aslo effect the wear.
  • The product quality. Heat treatment , successed or not? The weight and size, 100% based on drawings? Machining ?  and so on!


Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.