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目前测定磷矿石中氧化镁多采用原子吸收法和沉淀分离-EDTA容量法~([1-2])。由于云南磷矿主要是沉积磷块岩,镁和钙伴生在碳酸盐中,笔者采用KCl-HNO_3混合溶剂溶样,容量法~([3])快速测定磷矿浮选尾矿中的镁,具有便捷、快速、准确等优点。1实验部分1.1主要试剂混合溶剂:称取80 g KCl(AR级)溶于500 mL水中,缓缓加入500 mL HNO_3(AR级)溶解混匀后,定容为1L。糊精溶液:30g/L,称取3g糊精
At present, the determination of magnesium oxide in phosphate rock by atomic absorption method and sedimentation separation-EDTA capacity method ~ ([1-2]). Since Yunnan phosphorite is mainly sedimentary phosphorite and magnesium and calcium are associated with carbonate, the authors used the KCl-HNO3 mixed solvent to dissolve and measure the magnesium in the phosphate rock flotation tailings rapidly by the volumetric method ~ ([3]) , With the advantages of convenient, fast, accurate and so on. 1 Experimental 1.1 The main reagent mixed solvent: Weigh 80 g KCl (AR grade) was dissolved in 500 mL of water, slowly added 500 mL HNO_3 (AR grade) dissolved and mixed, the volume of 1L. Dextrin solution: 30g / L, weighed 3g dextrin