Novel Fatty Acid−based Collector in Low−temperature Desilication of Iron Ore by Flotation in Anshan City
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摘要:
采用复配的新型脂肪酸类耐低温捕收剂KDB−3，针对鞍山某选厂的混合磁选精矿进行了低温反浮选实验研究。结果表明，在混合磁选精矿铁品位为50.10%时，采用“一次粗选一次精选三次扫选”的反浮选流程，在矿浆温度10~15 ℃、抑制剂苛化淀粉用量650 g/t、活化剂氧化钙用量900 g/t、捕收剂用量1150 g/t、调整剂氢氧化钠用量为900 g/t（pH值=11.5）粗选条件下，使用油酸钠作为捕收剂仅获得铁精矿铁品位66.57%、回收率67.16%，而相同条件下KDB−3捕收剂获得了铁精矿铁品位67.80%、回收率87.46%，比油酸钠分别高1.23百分点、20.30百分点，展现了良好的分选效果。浮选闭路实验结果表明，新型捕收剂KDB−3在常温（25 ℃）下获得了铁品位67.90%、回收率89.18%的铁精矿，低温条件（10~15 ℃）下的浮选指标也基本一致，展示出了新型脂肪酸类捕收剂KDB−3在低温与常温条件下都适用的特点。该药剂实现了对鞍山市某选厂铁矿石的有效低温浮选。
Abstract:A low−temperature reverse flotation experimental study was carried out on the mixed magnetic concentrate from a processing factory in Anshan using a new fatty acid−based low−temperature resistant collector KDB−3. The results showed that the reverse flotation process of "one stage rougher flotation, one stage cleaning and three stage scavenging" was adopted for the mixed magnetic concentrate with 50.10% iron grade. When the roughing slurry temperature was 10 ~ 15 ℃, the dosage of inhibitor caustic starch was 650 g/t, the dosage of activator calcium oxide was 900 g/t, the dosage of collector was 1 150 g/t, and the dosage of adjusting agent sodium hydroxide was 900 g/t, and the dosage of sodium hydroxide was 900 g/t (pH=11.5), an iron ore concentrate with iron grade of 67.80% and recovery of 87.46% was obtained using KDB−3, while only an iron ore concentrate with iron grade of 66.57 % and recovery of 67.16% was obtained using sodium oleate as collector under the same experimental conditions, showing the remarkable effect of the novel collector. When the novel collector KDB−3 was used, an iron ore concentrates with an iron grade of 67.90% was obtained at room temperature (25 ℃), with a recovery of 89.18%, which was similar to the indexes under low−temperature conditions, indicating the applicability of the novel fatty acid type collector KDB−3 under both low−temperature and room−temperature conditions. Effective low−temperature flotation of iron ore from a processing plant in Anshan city was achieved.
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Key words:
- reverse flotation /
- low temperature /
- collector /
- iron ore /
- hematite /
- quartz
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表 1 样品化学多元素分析结果
Table 1. Results of chemical multielement analysis of sample
/% 元素 Fe SiO2 MgO CaO Al2O3 含量 50.10 20.11 4.98 4.10 1.42 
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表 2 矿物组成测定结果
Table 2. Determination results of mineral composition of sample
/% 矿物名称 赤铁矿 磁赤铁矿 磁铁矿 菱铁矿 石英 其他 合计 矿物含量 31.35 28.20 8.00 4.05 16.01 12.39 100.00 矿物Fe含量 69.08 68.75 75.00 42.13 / / 50.10 铁分布率 43.22 38.70 11.98 3.41 / 2.69 100.00
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表 3 浮选给矿试样粒级分布及铁含量测定结果
Table 3. Results of particle size distribution and iron content determination of flotation feed sample
粒级/mm 产率/% 铁品位/% 铁分布率/% +0.074 0.89 19.92 0.26 −0.074+0.043 12.82 20.03 4.83 −0.043+0.02 72.35 57.33 83.01 −0.02+0.01 10.30 44.79 9.02 −0.01 3.64 39.11 2.88 合计 100.00 50.26 100.00
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表 4 浮选闭路实验结果
Table 4. Results of flotation closed−circuit tests
温度 产品名称 产率/% 铁品位/% 回收率/% 常温（25℃） 铁精矿 66.30 67.90 89.18 尾矿 33.70 16.20 10.82 给矿 100.00 50.48 100.00 低温（10~15℃） 铁精矿 64.71 67.80 87.46 尾矿 35.29 17.82 12.54 给矿 100.00 50.02 100.00
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