Calcium hydroxide separation method for full circulation process used for non-cyanide extraction wastewater of non-ferrous, precious and rare metals

The invention provides a calcium hydroxide separation method for a full circulation process used for non-cyanide extraction wastewater of non-ferrous, precious and rare metals. The full circulation process used for non-cyanide extraction wastewater of non-ferrous, precious and rare metals comprises the following process steps: alkaline wet grinding, aeration and pre-oxidation; purification of circulating water and non-cyanide extraction; conversion of a pregnant solution (1); reduction deposition of a pregnant solution (2) to obtain metals. According to the invention, a complexing agent (1) and a complexing agent (2) which are significantly different in natures and complexing ability are adopted; and the reagents and procedures can be increased or decreased and adjusted based on the typesof minerals and on whether toxic matters are included just as shown in embodiments in the invention. 本发明提出的有色金属稀贵金属非氰提取废水全循环工艺氢氧化钙分离法，包括碱性湿磨充气预氧化，循环水净化，非氰提取，贵液（1）转化，贵液（2）还原沉积得金属及母液循环工艺步骤；系统采用了两类性质与络合能力有明显差异的络合剂（）与络合剂（二），所用试剂与