Gypsum was already used by the Greeks and Romans as building material for plastering walls and producing artful ornaments.
Today gypsum is offered in many variations, for instance chemical additives can extend the solidifying time or increase the fire resistance of gypsum. The addition of fibres into the gypsum allows the production of fibre walls, covering gypsum with paper produces the widely spread plasterboards used to build drywalls and divide rooms inside houses.
The raw gypsum is usually won in quarries or in mines. After several size reduction steps it is heated in rotary kilns and subsequently ground in a mill to its desired final particle size distribution.
A high number of Bauermeister mills are in operation for gypsum grinding all around the world. A typical fineness for stucco is a D90 = 200 μm which can be achieved on a Bauermeister Universal Mill UM. As gypsum grinding usually produces a wide particle size distribution, Classifiers are often used to produce steep particle size distributions or very fine distributions with a sharp top cut. If an even finer particle size is desired, Bauermeister Gap Mills GM (possibly also with the addition of an air classifier) can be used.
Depending on the required product fineness and output rate an optimal combination of milling parameters is available. These can be determined in trial grindings in our Technology Center. The decision for one of the many different grinding plant variations depends on the general conditions as well as the requirements of the customer. Bauermeister specialists will gladly assist you in the assessment of these characteristics and help chose the correct mill and plant type that matches your requirements.