Jaw Crusher specifications are expected to use the width of I B and L to indicate the length. For example, 900 × 1200 mm jaw crusher said its mouth wide to the mine to 900 mm, length 1,200 mm.

According to the jaw crusher feed mouth width can be divided into large, medium and small three types. Feeding mouth width greater than 600 mm to as large, I expected to 300-600 mm, width of the medium, feeding mouth width is less than 300 mm, for small. To the production of all E-crushing machine to mine the largest block of width than I expected to small B 15-20%, that is, feeding the largest slice of the largest D B = 0.85-0.8.

Crushing and grinding of ore beneficiation is prepared before the operation. Beneficiation is a prerequisite to make a useful minerals in the ore reached monomer separation. As useful minerals to the single particle size is very small, it is sometimes necessary to ground ore will be less than 0.074 mm accounted for 80 per cent of the fine, and even some small way to achieve some useful minerals monomer Separation. From stope ore block by the great degree, such as open-pit mining for ore block of up to about 1000 mm, 1000 mm to large pieces of broken pieces to the mine only a few dozen microns (1 micron = 1 / 1000 mm), fine-grained, often have to be completed in several stages. To broken, in the large-scale plant the general election coarse, medium and fine three broken (also adopted four paragraphs), the lump ore gradually reduced to the size of 8-25 mm around, and then sent to the abrasive grinding machine . Until useful mineral particles to achieve separation of the monomers.

Grinding is usually a paragraph or two. Crushing and grinding of a few of the lines shown in Table 2-2.

It should be noted that Table 2-2 in the grinding and crushing of the division are relatively few, with the election plant size, the use of grinding and crushing equipment type specifications, the fineness of the product requirements and other conditions.

Crushing and grinding of several of the outstanding 2-2

Of the other
Mine name to the size (mm) Product Size (mm)

Rough broken 1500-500 400-125

Broken in the 400-125 100-25

Chronology 100-25 25-5

1-0.3 coarse grinding 25-5

Fine grinding 1-0.3 0.1-0.074


At present, the ore crushing and grinding method primarily with the role of institutions of the more common mechanical force generally have the following five.

A, crushed by two broken face when approaching the squeeze pressure and make the materials broken. E-crushing machine, roll crusher, cone crusher are the main way to crushing the broken machinery.

B, splitting broken teeth wedge tip is to use the materials to carry out the split of the broken, and the role of the concentration of a limited fragmentation, in brittle materials to the crusher.

C, borker materials in the face of crushing load as bear on the two points (or fulcrum) beam, a pack materials flexor surface itself broken.

D, two broken face grinding stripping materials made in the relative movement of materials imposed shear stress, so that material rupture occurred. Of this fine-grained materials suitable for grinding.

E, it is crushing impact of the use of broken ore. Impact of the moment is the role of the ore. For example, the counter-crushing machine is broken in the main impact.

Elected by the crushing plant, grinding often several broken at the same time the role of the joint approach.