Method for co-production of nanometer hydroxyapatite and calcium sulfate whisker from phosphogypsum

The invention discloses a method for co-production of nanometer hydroxyapatite and calcium sulfate whisker from phosphogypsum and particularly relates to a method for preparing high-grade nanometer hydroxyapatite and calcium sulfate whisker from an industrial byproduct, namely, phosphogypsum. The method comprises the following steps of firstly pretreating cheap industrial byproduct phosphogypsum as a raw material, namely, washing, disassociating and filtering to remove a small amount of insoluble impurities, and disassociating the phosphogypsum with complex impurity into pure calcium ions and a solution of sulfate ions and then respectively mixing and crystallizing to prepare high-grade nanometer hydroxyapatite and calcium sulfate whisker. The technology and process adopted by the method are stable and reliable, the nanometer hydroxyapatite can be used for adsorption of heavy metal ions and the improvement and repair of the soil, the calcium sulfate whisker can be used in composite materials as filler and thus the current situations of large accumulation, environmental pollution and difficulty in application of phosphogypsum are improved and the method has good application prospects and economic and social benefits.