It is necessary to differentiate between 'power station' gypsum, which is released in desulphurizing plants at power stations using coal, and phosphorous gypsum from the production of artificial fertilizers. Power station gypsum has similar technical properties to natural gypsum and is appropriate as a raw material for both plasterboard and Portland cement. Phosphorous gypsum has a higher likelihood of unwanted constituents because of the raw material used. This will often include radioactive substances. Gypsum is also a by-product of other industries, such as in the production of phosphoric acid and titanium oxide, but often contains large quantities of unwanted materials such as heavy metals.
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