新型捕收剂DJW-Ⅱ反浮选齐大山选矿厂混合磁选铁精矿

A New Collector DJW-Ⅱ to Reverse Flotation the Mixed Magnetic Concentrate from Qidashan Concentrator

齐大山选矿厂采用阴离子型捕收剂LKY反浮选提纯混合磁选铁精矿,获得的精矿铁品位为67.77%、回收率为78.86%,使用LKY矿浆需要加温不仅增加了选矿能耗和工艺的复杂性,而且会降低流程的稳定性。为解决这些问题,相关课题组以新研制的脱硅捕收剂DJW-Ⅱ对现场混合磁选铁精矿试样进行了室温(21℃)浮选试验,并对闭路试验精矿和尾矿进行了XRD和SEM分析。结果表明:-0.037 mm粒级产率为68.21%,主要矿物为磁铁矿和石英,铁在微细粒级有明显富集的试样,在pH调整剂NaOH用量为500 g/t(pH=9.0),抑制剂羧甲基淀粉用量为150 g/t,捕收剂DJW-Ⅱ用量为175 g/t情况下,采用1粗1精3扫流程处理试样,获得了铁品位为67.60%、铁回收率为86.05%的铁精矿,试验精矿指标较现场精矿指标明显优越。因此,齐大山铁矿选矿厂混合磁选铁精矿反浮选除杂以DJW-Ⅱ为捕收剂,既有利于降低生产工艺的复杂性,又有利于降低生产能耗、改善生产指标、提高经济效益。XRD图谱分析证明了DJW-Ⅱ在铁精矿反浮选脱硅中的高效性;SEM图片显示,试样中的微细颗粒主要是铁矿物颗粒。

Qidashan Concentrator uses anionic collector LKY to purify the mixed magnetic iron concentrate by reverse flotation. The obtained concentrate of iron grade is 67.77% and the recovery rate is 78.86%. The slurry with collector LKY re?quires heating not only increases the energy consumption in the beneficiation. And the process is complexity,and will reduce the stability of the process. In order to solve these problems,the relevant research group conducted flotation test on the onsite mixed magnetic iron concentrate sample with the newly developed desiliconization collector DJW-II at room temperature(21 ℃),and XRD and SEM analysis of closed-circuit test concentrate and tailings were performed. The results show that the-0.037 mm fraction yield is 68.21%,the main minerals are iron minerals and silica,the iron is obviously enriched in the fine fraction,and the pH adjuster NaOH is 500 g/t(pH=9.0),the inhibitor carboxymethyl starch dosage is 150 g/t,and the collector DJW-II dosage is 175 g/t. The sample is treated with single-stage roughing,single-stage cleaning and three-stage scavenging,to obtain iron concentrate with iron grade 67.60% and iron recovery rate of 86.05%. The test results is obviously superior to the on-site concentrate index. Therefore,the reverse mixed magnetic iron concentrate in the Qidashan Iron Ore Concentrator will use DJW-II as the collector,which will not only reduce the complexity of production process,but also re?duce the production energy consumption,improve the production index and improve the economic benefit. XRD pattern analy?sis proved the high efficiency of DJW-II in the desiliconization separation of iron concentrates. The SEM images showed that the fine particles in the samples were mainly iron mineral particles.