Phosphate Slag

(also basic slag), an alkaline phosphate fertilizer that is a by-product in the smelting of steel from pig iron in open-hearth production. A dark, heavy powder, phosphate slag is insoluble in water and does not cake. It contains 16–19 percent P₂O₅ in the form of silicon phosphate (4CaO·P₂O₅·CaSiO₃), which can be assimilated by plants, as well as 26–41 percent CaO and 4–12 percent MgO. Phosphate slags are most suited for acid soils as a base fertilizer for all crops. In the USSR, they are used to fertilize small areas.

单词	phosphate slag
释义	Phosphate Slag Phosphate Slag (also basic slag), an alkaline phosphate fertilizer that is a by-product in the smelting of steel from pig iron in open-hearth production. A dark, heavy powder, phosphate slag is insoluble in water and does not cake. It contains 16–19 percent P₂O₅ in the form of silicon phosphate (4CaO·P₂O₅·CaSiO₃), which can be assimilated by plants, as well as 26–41 percent CaO and 4–12 percent MgO. Phosphate slags are most suited for acid soils as a base fertilizer for all crops. In the USSR, they are used to fertilize small areas.
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