不同模数钠、钾水玻璃在胶磷矿正反浮选中抑制性能研究

Study on the Depressant Performance of Sodium and Potassium Water Glass with Different Modulus in Direct-Reverse Flotation of Collophane

摘要: 为了研究不同模数钠、钾水玻璃在胶磷矿正浮选中抑制性能，提高胶磷矿正浮选的效率，以晋宁磷矿低品位胶磷矿为对象，采用正浮选探究了不同模数钠水玻璃与钾水玻璃对硅质矿物的抑制性能及磷矿物浮选的影响。实验结果表明相同模数的钾水玻璃的抑制能力大于钠水玻璃，高模数的水玻璃抑制性能优于低模数的水玻璃，低模数的水玻璃在较高用量时，也具有较好抑制性，模数在2.8~3.4之间水玻璃较为适宜。在磨矿细度为−0.074 mm 88.10%，试验温度T = 15℃，采用正反浮选工艺，正浮选采用模数为3.32的水玻璃作为抑制剂，正浮选的流程为一次粗选一次精选一次扫选，反浮选为一次粗选一次扫选，中矿顺序返回的闭路流程实验，获得磷精矿的品位为28.23%，回收率达到了90.36%，正浮选与反浮选尾矿分别为5.26%，1.59%的选矿指标。

Abstract: In order to study the depressant performance of sodium and potassium water glass with different moduli in the direct flotation of collophanite and improve its efficiency, low-grade collophanite from the Jinning phosphate deposit was studied. The effects of water glass sodium and potassium with varying moduli on the depression of siliceous minerals and the flotation of phosphate minerals were examined using direct flotation. The experimental results indicate that: Potassium water glass exhibits stronger depressing power than sodium water glass at the same modulus. Higher modulus water glass demonstrate superior depressing performance compared to lower modulus ones. Lower modulus water glass also achieves good depression at higher dosages. A water glass modulus within the range of 2.8~3.4 is optimal. Under the conditions of a grinding fineness of 88.10% passing 0.074 mm and a temperature of 15˚C, a combined direct-reverse flotation process was employed. For the direct flotation stage, sodium water glass with a modulus of 3.32 was used as the depressant, following a flowsheet comprising one rougher, one cleaner, and one scavenger step. The reverse flotation stage consisted of one rougher and one scavenger step, with middlings returned sequentially in a closed-circuit test. This process yielded a phosphate concentrate assaying 28.23% P₂O₅ with a recovery of 90.36%. The P₂O₅ grades in the direct flotation tailings and reverse flotation tailings were 5.26% and 1.59%, respectively, demonstrating excellent beneficiation performance.