Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Herein,micro iron ore tailings(micro-IOTs)were prepared by wet-grinding and applied to improve sulphoaluminate cement(SAC)performance.The physicochemical properties of micro-IOTs were investigated by particle size analysis,XRD,and XPS.The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD,TGA,MIP,and SEM.The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding.The setting time of SAC gradually decreased with increasing micro-IOTs content.By adding 2%micro-IOTs,the compressive strengths of SAC pastes were enhanced about 22%and 10%at 4 h and 28 d,respectively.Moreover,the addition of micro-IOTs accelerated ettringite precipitation and changed its morphology,resulting in early strength improvement of the binary system.And increased later strength by micro-IOTs was closely related to the high content of AH_(3),fine pore structure,and high hydration degree of SAC.The findings suggested one new approach to utilize iron ore tailings in cementbased materials.

Process Mineralogy of Iranian High Sulfur Iron Ore

Processing of Iranian high sulfur iron ore is problematic in minerals industry. The iron ores were studied by the means of polarizing microscopy, chemical analysis, X-ray diffraction. The study shows that the iron ores have high grade of iron, and complex structures. XRD showed that the iron ore consists of metallic minerals such as magnetite with a small amount of hematite and limonite and non-metallic minerals as serpentine, chlorite, and talc. The average particle size of magnetite crystals is 0.182 mm. The ore contains 1.62% sulfur as harmful impurity in form of pyrite mineral. Due to the isomorphism of magnesium and iron, magnetite mono crystal grade is lower than 68%, and difficult to be physically upgraded to a higher-grade iron concentrate using the available mineral processing technologies.

辽宁某氰化尾渣浮硫试验

为提升辽宁某黄金选厂氰化尾渣的综合利用效率,基于样品性质研究,采用单因素条件试验以及开路、闭路试验分别考察了调整剂种类、捕收剂种类及用量、起泡剂用量、矿浆pH值、扫选药剂用量对分选效果的影响,确定了浮选回收工艺的适宜药剂制度以及工艺流程。结果表明:①氰化尾渣中脉石矿物以铝硅酸盐为主,具有回收利用价值的元素为S,赋存于黄铁矿中,是主要的有价回收组分。②氰化尾渣-0.038 mm、-0.074 mm粒级产率分别达54.98%和77.44%,硫矿物解离较充分,浮选回收过程中不需要进行磨矿。③对因科法破氰后的尾渣,适宜的浮选药剂制度为:捕收剂丁基黄药用量160 g/t、起泡剂2号油用量30 g/t,扫选起泡剂用2号油量10 g/t、矿浆pH值7.2。在上述药剂制度下,经过1粗2精2扫的闭路浮选流程处理,最终可得到硫品位44.20%、硫回收率58.73%的浮选精矿。本研究确定了氰化尾渣硫回收适宜的工艺条件,实现了黄金选厂氰化尾渣有价组分的高效提取和清洁化利用。

提高武山铜矿细粒黄铁矿回收率试验研究

武山铜矿选矿厂一段旋流器溢流硫品位为8.46%,且粒度极细,-10μm粒级产率达44.93%、硫分布率达44.20%。为提高现场细粒硫回收效果,进行了选矿试验研究。结果表明,二次分级旋流器适宜的溢流管、沉砂嘴直径分别为48、20 mm,二次分级沉砂硫分配率为73.40%,较现场旋流器参数下提高2.13个百分点;试验确定的捕收剂乙基黄药粗选总用量为140 g/t,对应的粗选1、扫选1、扫选2用量分别为80、40、20 g/t;试样的旋流器分级沉砂采用1粗2扫、中矿合并返回流程处理,与中矿顺序返回流程相比,在精矿硫品位略低的情况下硫回收率提高了1.7个百分点;将现场细粒浮选2次扫选精矿合并给入粗粒浮硫扫选2作业,可提高硫回收率1.4个百分点,工业试验指标较好。

硫铁尾矿制备聚合氯化铝铁及其应用研究

常压下用盐酸直接酸浸硫铁尾矿,通过聚合制得聚合氯化铝铁。研究影响氧化铝、氧化铁溶出率的因素,得到用该硫铁尾矿制备聚合氯化铝铁的最佳条件。将该聚合氯化铝铁用于去除废水浊度,表明它是一种新型高效絮凝剂。

某铁矿超细碎尾矿工艺矿物学研究

为了解某铁矿超细碎尾矿的工艺矿物学特征,为开发利用提供依据,通过偏光显微镜、化学分析、荧光光谱、布鲁克能谱和MLA650等多种测试分析手段进行了系统的工艺矿物学研究。结果表明:①矿样中主要脉石矿物钠长石含量为52.84%,有用铁矿物磁铁矿和赤铁矿含量分别为3.00%和2.98%,主要含硫矿物黄铁矿含量为3.25%。②Fe主要赋存在磁铁矿、赤铁矿和黄铁矿中,分布率分别为24.65%、23.73%和17.17%;有害元素S主要分布在黄铁矿中,分布率为96.15%,因此,对矿样降硫即是除去矿样中的黄铁矿。③理论上浮选能有效降硫,重选的降硫效果需要选矿实验进一步验证。

某选锌尾矿硫砷分离工艺研究

以某选厂选锌尾矿为研究对象进行硫砷分离工艺研究。确定采用先磁后浮、磁选尾矿再硫砷混浮、混合精矿再采用抑硫浮砷法分离硫砷的工艺流程,以组合抑制剂石灰+腐植酸钠+WX-2联合抑制硫、硫酸铜活化砷,通过小型闭路试验,可获得硫品位39.86%、砷品位0.76%、硫回收率65.05%的硫精矿;砷品位12.52%、砷回收率44.19%的砷精矿。硫精矿含杂低,质量较好,硫砷分离成功。

火焰原子吸收光谱法测定硫铁矿选矿尾砂中的钴

确定了利用火焰原子吸收光谱法测定硫铁矿选矿尾砂中的钴含量最佳测定工作条件,操作步骤少,条件易控制,分析速度快,消耗试剂量小,工作时间大大缩短,RSD为9.4%,结果稳定可靠。经大量试验证明,采用此法测定,方便快速,结果令人满意。

选锌尾矿中低品位硫的回收工艺研究

锌尾矿中的伴生硫铁矿在主金属回收过程中一般受到强烈抑制,加上尾矿性质复杂,回收难度大。针对某含黄铁矿及磁黄铁矿的选锌尾矿,进行了先磁后浮和先浮后磁的磁浮联合工艺回收硫的试验研究。试验结果表明,先磁后浮方案,经粗-精-扫选工艺流程试验获得了含硫35.33%,回收率为83.73%的硫精矿;先浮后磁方案,经粗-精-扫选工艺流程获得了含硫37.68%,回收率为83.48%的硫精矿,脱硫后的尾矿含硫品位低至0.18%,为尾矿综合利用创造了条件。