STUDY ON EFFECTIVE CALCIUM ENRICHMENT FROM PHOSPHORUS WASTE SLAG FOR APPLICATION AS A FERTILIZER ADDITIVE

Abstract

Phosphorus waste slag is the solid waste of producing yellow phosphorus in
electrical furnace. The phosphorus waste slag contains metals oxide as SiO2,
Al2O3, CaO, MgO,.., in which the CaO is 40 - 50%. In this study, the effective
calcium in phosphorus waste slag was separated and enriched using to product
the fertilizer. The separated process was studied in pH 3, stirred with 200r.min-1,
the temperature was 70oC in 50 minutes, the ration of the extracts and the
phosphorus waste slag was 1:5. The results showed that the effective calcium of
product obtained was high, reached to quanlity standard QCVN 01-
189:2019/BTNMT as a calcium-rich fertilizer additive.