GYPSUM PROCESSING EQUIPMENT Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4-2H2O. In nature it can be found in gypsum quarries. Well known is the burned gypsum called ‘Plaster of Paris’, mined from the quarries in the Montmartre district of Paris. Commercial quantities of gypsum are found in Brazil, Pakistan, Jamaica, Iran (world's second largest producer), Thailand, Spain (the main producer in Europe), Germany, Italy, England, Ireland, Canada and the United States. The largest gypsum quarry in the world is located in Milford Station, Nova Scotia, Canada. Several small mines also exist in places such as Kalannie in Western Australia, where gypsum is sold to private buyers for changing the pH levels of soil for agricultural purposes Gypsum also occurs as a byproduct in the production of phosphate and is recovered via flue-gas desulfurization at some coal-fired power plants. This synthetic gypsum can be used interchangeably with natural gypsum in some applications. The purity of the last two forms can be considered as highly pure (> 95%). Ventilex gypsum processing equipment Benefits: High energy savings—up to 40% Long lifetime, reliable dryers Advanced control strategies Accurate product temperature control Abrasive materials without excessive wear Raw gypsum has to be cracked (or calcinated) before it can be used. Common uses of gypsum are for example: Gypsum board Plaster ingredient (surgical splints, casting moulds, modeling) Fertilizer and soil conditioner Filler in the food industry A component of cement used to prevent flash setting of concrete In foot creams, shampoos and many other hair products Impression plasters in dentistry Gypsum is known in the following chemical states: di-hydrate, CaSO4 - 2H2O, the set gypsum or the natural gypsum crystals in quarries; hemi-hydrate, 2 CaSO4 - H2O or CaSO4 ½H2O, calcium sulfate hemi-hydrate or di -calcium sulfate mono-hydraat, gypsum plaster powder that upon the addition of water absorbs water of crystallisation, and thus is hard again and forms the dihydrate; gamma-anhydraat, CaSO4, the waterpoor variant that can be used as drying agent; bèta-anhydraat, CaSO4, the anhydrous variant that is used as a filler.

Production of plaster from natural gypsum High-quality gypsum rock is extracted at quarries or mines. Large rocks are crushed into small pieces in a grinding mill. At some plants, the crushed rock undergoes a surface drying process before being grinded. The mill reduces small rocks to a very fine, chalk-like powder called land plaster. This land plaster contains about 21 percent of chemically bound water that has to be removed by means of calcination or burning the plaster. Depending on the intended use of the plaster different calcination process steps can now follow.. For the production of...

Imtech Ventilex calcination equipment Ventilex is a leading supplier of gypsum and plaster dryer production lines. We offer a highly developed product line that is in use at the leading producers worldwide. Experience has shown that significant benefits, the most important being much improved fuel economy, arise from the use of fluid-bed dryer/cooler technology rather than the traditional rotary drum. The basic principles of the Ventilex line are drying, calcination and cooling through ambient air of the gypsum and plaster. The dryer is a so called fluid bed dryer in which a product or solid...

Imtech Ventilex Gypsum Processing equipment Two major areas of interest in drying systems for minerals are to be considered: 1. Drying systems for minerals consume a lot of energy leading to significantly higher operational costs and low margins. 2. Greater wear-and-tear on account of the abrasive nature of the materials being processed also means frequent maintenance and repairs or replacement expenses. Fluid bed dryers from Ventilex are the ideal solution for the minerals industry because they are developed to dispel the aforementioned issues: Ventilex high-efficiency bed dryers typically provide...