What is atox mill?
Our ATOX® Coal Mill is a compact vertical roller mill that can grind almost any type of raw coal. The coal mill utilises compression and shear force generated between the large rollers and the rotating table to crush and grind raw coal, removing the need for a separate piece of equipment for crushing.
How does vertical raw mill work?
In the vertical roller mill which is widely used in the raw material grinding process, raw materials input grinding table are crushed and pulverized on it and transported to separator by kiln exit gas introduced into the mill as drying, transporting and separating purpose.
What is raw mill in cement plant?
A raw mill is the equipment used to grind raw materials into “rawmix” during the manufacture of cement. Rawmix is then fed to a cement kiln, which transforms it into clinker, which is then ground to make cement in the cement mill.
How does a coal mill work?
Coal Pulverizer Purpose Coal pulverizers are used to dry, grind and classify. Drying is achieved as hot gas passes through the pulverizer and removes moisture from the pulverized coal. The hot gases used should have a low oxygen content, this reduces the likelihood of accidental combustion within the mill.
How does a cement mill work?
Cement manufacturing – brief description of a cement mill This is essentially a large rotating drum containing grinding media – normally steel balls. As the drum rotates, the motion of the balls crushes the clinker. The drum rotates approximately once every couple of seconds.
How much moisture can you feed in VRM?
Generally, Roller mills can accommodate high size (up to 80–100 mm) and high moisture (20 %); whereas Ball Mills can normally accommodate (up to 25 mm) & moisture up to 12 %.
What is roller mill principle?
Principle of grinding The working principle of the High Pressure Roller Mill is two rolls, which are counter rotating at the same circumferential speed. One roll is connected to a hydraulic system which creates a radial force. The feed to the rolls creates a so called “bed” of material in the roll gap.
Why gypsum is added to the cement?
It helps in controlling the rate of hardening of the cement. A small amount of gypsum is added to the clinker upon its cooling during the final grinding process. It controls the setting of cement. If it isn’t added, the cement immediately sets post mixing water and there is no time left for concrete placing.
What is the formula for cement?
Chemical Formulas of Cement Materials
| C | CaO |
|---|---|
| M | MgO |
| C3S | 3CaO·SiO2 = tricalcium silicate = alite |
| C2S | 2CaO·SiO2 = dicalcium silicate = belite |
| C3A | 3CaO·Al2O3 = tricalcium aluminate |
What is the difference between VRM and ball mill?
Operation of a ball mill is relatively simple, with no moving mechanical parts within the mill itself. The system is tolerant to variations in both mill feed quality and quantity. By contrast, the VRM is a more complex piece of equipment with a sophisticated hydraulics system that operates the rollers.
