The basic theory of smash pulverizer

First, the purpose of smash

Overcome with solid waste particles outside the cohesion will make bulk solid waste the process of splitting into small pieces called smash so that small particles of solid waste split into powder known as the grinding process. Solid waste broken grinding and grinding following objectives:

(1) to reduce the volume of solid waste, easy transportation and storage.

(2) for the separation of solid waste to provide the requested size selected for the effective recovery of a solid waste composition. (3) the specific surface area of solid waste, increasing incineration, thermal decomposition, melt operations, such as the stability and thermal efficiency.

(4) solid waste for the next step in preparation for additional work, for example, coal gangue brick, cement and other system, and require coal crushing and grinding stone to a certain size below, in order to further the use of fabrication.

(5) the livelihood of crusher garbage disposal at the landfill, and high density uniform compaction, soil rehabilitation can speed up reduction.

(6) To prevent large, sharp damage to the solid waste sorting, incineration and pyrolysis as well as other equipment.

Second, the mechanical strength of solid waste and fragmentation method

(1) the mechanical strength of solid waste

Solid waste refers to the mechanical strength of solid waste-crushing resistance. Usually static load measured compressive strength, tensile strength, shear strength and flexural strength to express.

Compressive strength of which the largest, followed by shear strength, flexural strength of the smaller, anti-opening intensity minimum. Generally solid waste as a criterion for measuring compressive strength. 50 MPa compressive strength greater than those for the hard of solid waste; 40-25 MPa, in the hardware for solid waste for less than 25 MPa, soft solid waste. Solid waste and waste the mechanical strength of the particle size, particle size small waste, the macro-and micro-cracks than the smaller size particles, thus higher mechanical strength.

In practical engineering, in view of the hardness of solid waste to a certain extent reflect the degree of difficulty was smash, so the waste can be smash that his hardness of. It is well known that the hardness of mineral hardness can be divided into Mo-10, its hardness from small to large are as follows:

(1) Waterloo paste:

(2) gypsum:

(3) calcite (4) fluorite

(5) limestone

(6) feldspar:

(7) quartz:

(8) yellow jade

(9) of corundum

(10) diamond. The hardness of solid waste can be compared with these minerals to determine.

Another method is based on the materials in the pulverizer characters into the hardest materials, hard materials, hardware stores and four soft materials, such as shown in the table below.

The classification of various materials hardness

Soft materials rigid materials in the most hard materials hard materials

Asbestos mine limestone granite iron minerals

Gypsum mine dolomite metal ores corundum

Stones

SiC sandstone calcium carbide

Soft-slag gypsum board Nihui hard clinker

Sintering bituminous rock salt sintered magnesia products

Lignite toughness chemicals

Fang Shi Shuo

pulverizer in need of waste, the majority showed brittle, waste in a small fracture deformation before. But there are also some need pulverizer waste at room temperature showed high plasticity, these wastes using traditional crusher difficult pulverizer, we need to adopt special implementation. For example, in the pressure of ground tire rubber can produce larger plastic deformation and crack, but can use its fragile low-temperature performance and effectively pulverizer. Also pulverizer metal cutting down the metal shavings, the pressure can only be compacted into its mission, but not crumbled into small pieces or small, powder, must use a special metal cutting crusher effectively pulverizer.