Analysis of the producibility of mineral fertilizers from industrial waste

Most industrial waste in the form of sludge materials or dusts characterised by a high content of potassium, phosphorus, calcium or sulphur can, upon proper pretreatment, become complete fertilizers for agriculture, vegetable farming or forestry. The Department of Manufacturing Systems of AGH carried out research tests on the dry granulation of selected waste. The first group of materials included post-filtration sludge materials from the chemical industry which contained significant amounts of magnesium and potassium compounds and did not contain harmful substances and heavy metals. The other waste was the FGD gypsum which is calcium sulphate dihydrate. The third material which underwent initial granulation tests consisted of ash which was a biomass combustion side product containing mainly calcium oxide and silica. The article shows test research results which prove that is possible to produce proper granules from selected waste.

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