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A method for the determination of chromium content in TSP is described, including the preparation of digested sample with mixed acid, adoption of flame-AAS on the digested sample in acid medium, and determination of chromium content with adding calibration curve method.The method brings the correlation coefficient r=0.9992, standard addition recovery of 96.40%-101.30%.

Linfei Yu Fufei

Experimental study on preparation of calcium superphosphate from phosphorus-containing tailings of Longling phosphate iron rock

Author: Zhong, Ying ; Qi, Tao

The method for preparation of calcium superphosphate from flotation tailings with dilute acid mineral powder method is studied.The effects of sulfuric acid amount, concentration and acid temperature on conversion rate of tailings are investigated by orthogonal experimentThe results show that when the sulfuric acid amount of 105%, concentration of 55% and acid temperature of 80°C, the conversion rate is highest, the products can achieve the requirements for I grade SSP.

Linfei Yu Fufei

Pretreatment technology of phosphogypsum

Author: Chen, Hong-qiong

A review, with 28 references, is given on the pretreatment technol. of phosphogypsum.The impurities in phosphogypsum is classified and discussed, the pretreatment technologies of phosphogypsum are introduced.A harmless treatment technol. of phosphogypsum is briefly introduced, which uses the phosphorus tailings slurry to treat phosphogypsum.This technol. is with the simple process, low processing cost, and is easy to be implemented.

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100 Translational Medicine associated with Yunnan Yuntianhua International Chemical Co., Ltd.

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