Originally Posted by MarceloGarza

Dear sirs,

I work in a metallurgic plant in Mexico that produces ferromanganese. As of today, we are using jaw crushers to crush the ferromanganese, but they generate a lot of fines (about 8% of the in-feed). One of our main concerns is to reduce the generation of fines. I thought that a roll crusher would be a good idea, but if you could help me finding the right crusher, I would appreciate it. Here is some information about the material:

in-feed size: 5 inches

temperature: 35ºC

density: 7.4 tons/m3

in-feed quantity: 10 tons/hr

desired output size: different products; between 3 inches and 1/2 inch,

4 inches and 1 inch,

2 inches and 1/2 inch

I also performed several tests, verifying how much pressure could be applied over a 5" piece before it cracked, and on average they cracked at 2680 psi, and at the most, they would crack at 3600 psi.

Thank you

Marcelo Garza

Dear Marcelo,

Could you please give us an analysis of particle size distribution for the in-feed?

I assume that you want to eliminate fines below 1/2inch as much as possible?

Would you tell us what the limit was i.e. how much percentage of fines max you could afford ?

Only a toothed type roll crusher may produce less fines. But,before selecting a relevant crusher,relative abrasiveness and crushing index of the material should be known.

Best Regards,

Guven GULER

Technical & Project Manager

MINET Mineral Energy & Technical Products Industry and Trade Co., Ltd.

Camlik Mahallesi, Esref Bitlis Bulvari ,Kiptas Aydos Pendik Evleri,

Menekse–1 Sitesi No:32,Kurtkoy-Pendik/ Istanbul-TURKIYE

Tel: +90 216.646 26 65 Fax: +90 216.646 26 67

http://www.minet.com.tr

GSM:+90 533 697 91 03 ■

Dear sir:

Our roller crusher can meet your need.

Our roller crusher can adjust the gap between two rollers, so you can get the output size as you want. It has very few fine output, because it is crushed by pressure.

Please visit our web http://www.hkgfco.com

Best regards

Kim Liu

email: hkgfcochina@yahoo.com ■

Please note that to suggest the suitable crusher, we need to know the details about the material to be crushed such as material composition, moisture content, hard groove index of material, % of silica content, feed size, product size, acceptable % and size of fines etc.

Regards.

Originally Posted by MarceloGarza

Dear sirs,

I work in a metallurgic plant in Mexico that produces ferromanganese. As of today, we are using jaw crushers to crush the ferromanganese, but they generate a lot of fines (about 8% of the in-feed). One of our main concerns is to reduce the generation of fines. I thought that a roll crusher would be a good idea, but if you could help me finding the right crusher, I would appreciate it. Here is some information about the material:

in-feed size: 5 inches

temperature: 35ºC

density: 7.4 tons/m3

in-feed quantity: 10 tons/hr

desired output size: different products; between 3 inches and 1/2 inch,

4 inches and 1 inch,

2 inches and 1/2 inch

I also performed several tests, verifying how much pressure could be applied over a 5" piece before it cracked, and on average they cracked at 2680 psi, and at the most, they would crack at 3600 psi.

Thank you

Marcelo Garza

■

Originally Posted by Wuhan Ker Machinery

Dear sir:

Our roller crusher can meet your need.

Our roller crusher can adjust the gap between two rollers, so you can get the output size as you want. It has very few fine output, because it is crushed by pressure.

Please visit our web http://www.hkgfco.com

Best regards

Kim Liu

email: hkgfcochina@yahoo.com

Once again a vendor has not read the post. Your output spectrum is too wide for open circuit crushing. Your required bottom sizes range from 12 - 25; your top size ranges from 100 - 50. All in 3 separate products. You have a screening issue not a crushing issue: however you arrange the nip settings.■

A rolls crusher would probably produce less fines than a jaw crusher. The problem is in the reduction ratio. A jaw crusher will take a large particle and reduce it to a very small percentage of its original size, this ratio for the larger crushers is 10-1 or better, for the Essa JC2500 the ratio is better than 20 to 1.

Rolls crushers on the other hand have a fixed reduction ratio of 4 to 1, this is due to the "pinch" factor. This means that to reduce a large particle to a fine size, it is necessary to use multiple passes, reducing rolls aperture between passes. This is a highly inefficient operation which can be improved by using multiple machines, however capital cost could be prohibitive. ■