Method for preparing calcium magnesium phosphate fertilizer from phosphorus-containing waste

The invention provides a method for preparing a calcium magnesium phosphate fertilizer from phosphorus-containing waste. The preparation method comprises the following steps: mixing phosphorus-containing waste liquid and waste residues with alkaline materials containing calcium and magnesium; calcining and cooling in a rotary kiln and a shaft kiln at high temperature; crushing, mixing and drying to prepare the calcium magnesium phosphate fertilizer. The preparation process is simple and environment-friendly, solves the problem of recycling of a waste aluminum etching solution and a polishing solution, and is stable in product, and the prepared calcium magnesium phosphate fertilizer conforms to the national industrial standard and has high economic benefits and social significance. 本发明提供一种含磷废料制备钙镁磷肥的方法。该制备方法包括以下步骤：利用含磷废液、废渣与含钙、镁碱性物料进行混合；经旋窑、立窑高温煅烧冷却；粉碎混合烘干制备成为钙镁磷肥。该制备工艺简单，环保，解决了废铝刻液、抛光液的回收再利用问题，产品稳定，制备出的钙镁磷肥符合国家行业标准，具有较高的经济效益和社会意义。