Determination of Naturally Endowed States of Calcium, Magnesium and Phosphorus in Phosphorite Tailings Sampled from Wengfu District of Guizhou Province

Naturally endowed states of calcium, magnesium and phosphorus in phosphorite tailings sampled from Wengfu district of Guizhou province were studied and analyzed by chemical analysis, X-ray diffraction analysis, scanning electron microscopy and X-ray photoelectron spectrometry. It was found that: ① the phosphorite tailings sampled from the ore slag were solid minerals containing high magnesium (wMgO 17.26%-17.65%), high calcium (wCaO 34.11%-34.56%) and low phosphorus (wP2O5 5.30%-5.69%). ② Magnesium in the tailings was mainly present in form of dolomite with small amounts present as phosphate and silicate; calcium was also present mainly as dolomite with small amounts present as calcite and phosphate; phosphorus was present mainly as apatite with small amounts occurred in iron oxide, monazite and xenotime.