What Are These Machines and How Do They Work?
A Ball Mill grinds material by rotating a cylinder with steel grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter, the slower the rotation. If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill.
The point where the mill becomes a centrifuge is called the "Critical Speed", and ball mills usually operate at 65% to 75% of the critical speed.
Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recalculated back into the mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills.
This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.
Application:
Ball mill is the key equipment for grinding after the crush process, and it is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics.
It also can be used for the dry and wet grinding for all kinds of ores and other grind-able materials.
Types:
Mill could be sorted as following:
As per the grinding media: ball mill, rod mill and AG Mill (without grinding media).
As per material discharging mode: wet grid mill, dry grid mill & overflow mill.
As per driving mode: side & central driving. The former is more popular now.
As per driving configuration:
a. Asynchronous motor driving: Asynchronous motor + Reducer + Pinion +Girth gear
b. Synchronous motor driving: Synchronous motor+ Air clutch+ Pinion +Girth gear
c. Asynchronous motor + reducer + diaphragm coupling
Structure of Ball mill:
The machine is composed of feeding part, discharging part, turning part and driving part (reducer, small driving gear, electric motor and electric control).
The quill shaft adopts cast steel part and the liner is detachable. The turning gearwheel adopts casting hobbing process and the drum is equipped with wear-resistant liner, which has good wear-resistance.
Export standard container 20GP OR 40GP,40HQ,FR container,In bulk,the spare parts in wooden case
What is Rotary Kiln?
Rotary kiln is composed of cylinder, gears, support device, kiln liner and kiln tail sealing equipment, kiln head hood and combustion. Cylinder as heated pivoting part, made of high-quality carbon steel plate.
Rotary Kiln Features:
1. Support device: advanced shaft structure, automatic temperature measuring device and electrical heating,.
2. Catch wheel: including two kinds mechanical wheel and hydraulic pressure
3. Gears: single or double. Control the rotating speed by buncher, DE machine and frequency variable motor. Be reliable, energy-saving, and efficient.
4. Cylinder tyre bolster: lower bolster has three types: fixed, zoom and floating. The structure is simple, replacement is convenient and won¡¯t hurt cylinder.
5. Sealing equipment: there are many kinds for choice according to kiln models, including air cylinder edge sealing, spring edge sealing, and graphite block sealing and combination for above.
6. Kiln head hood: including stationary type and flexible type.
Working Principle of Rotary Kiln:
1) With a certain slope to the level, the whole kiln body is supported by rollers and fitted with thrust rollers to control up and down movement of the kiln body.
2) Besides main driving unit for driving system, it is also fitted with the auxiliary driving unit so as to ensure the kiln body still can rotating when the main motor is powered off and prevent it from deforming.
3) The kiln head adopts housing type sealing and kiln rear uses axial contact sealing unit so that reliability of sealing could be ensured.
Types:
Rotary kiln belongs to building material equipment, and it can be divided into cement kiln, metallurgy chemical kiln and active lime kiln, porcelain kiln according, building material kiln, calcined petroleum coke rotary kiln to different materials.
Application of Rotary Kiln:
1) Rotary kiln is the Thermal Equipment, heating materials, in cement industry for calcining clinker.
2) It is also used in various industries, such as cement, nonferrous metallurgy, ferrous metallurgy, chemistry, building, refractory material, environmental protection, etc.
Export standard container 20GP OR 40GP, 40HQ, FR container, in bulk, the spare parts in wooden case.
Introduction &Characteristics:
Three-cylinder rotary drum dryer is mainly applied for stoving slag, sand, coal, fly ash, iron powder, ore, quartz sand and other particle materials. It has the following characteristics:
1) The cylinder protect itself, thermal efficiency can up to 95%.
2) The whole length of the dryer reduced to 50% approximately than mono-cylinder and reduced land investment to 50% approximately
3) Cylinder adopts heat-resistant and wear-resistant steel plate welding with long service life and easy maintenance.
4) High thermal efficiency , temperature of outer cylinder is 60or below(temperature of outer mono-cylinder is high to 150¡ãC)
5) Low temperature of outlet, long-service of dust removal machine. It also can be directly connected to air box pulse bag filter.
6) Without gear and pinion drive, but wheel rotation applied, level operation of the complete machine makes system simple and reasonable.
7) Air heater could match boiling furnace, or oil furnace can also be applied, which can dry materials with size below 20mm.
8) Final moisture index can be adjusted according to requirements of customers.
Export standard container 20GP OR 40GP, 40HQ, FR container, in bulk, the spare parts in wooden case
Introduction of jaw crusher for fine crushing:
A fine jaw crusher is one of the main types of secondary crushers in a mine or ore processing plant.
Features of jaw fine crusher machine:
A. High crushing ratio, equal product granularity
B. Simple structure, reliable working condition
C. Convenient maintenance, economical operation.
Application of jaw fine crusher machinery:
1) they are widely used in the works of mine, smelting, building materials, road, railway, irrigation, chemical industry, etc.
2) the crusher is applicable for the rough and medium crushing of rocks and ores with a compressive strength less than 320mpa. It is the preferred equipment of secondary crushing.
Export standard container 20gp or 40gp, 40hq, fr container, in bulk, the spare parts in wooden case.
Application of Flotation Machine:
This kind of machine is main equipment for the classification of the ores, which is used in the coarse dressing, fine dressing, and scavenging, anti-flotation and other kinds of ore dressing.
Types of Flotation Machine:
The flotation machine can be divided into XJK type (A type), SF type, JJF type and so on, which are widely used in the ore classification of some industrial departments of metal, nonmetal, rare metals and so on.
Standard container, spare parts will be packed in wooden cases
