甘肃某镜铁矿尾矿磁化焙烧—弱磁选试验

甘肃某镜铁矿尾矿中尚含有22.39%的铁,且铁主要以镜铁矿形式存在,其次以菱铁矿形式存在。为了给该尾矿的综合利用提供技术支持,以甘肃某焦化厂生产的半焦化煤粉作为还原剂,对该尾矿进行了磁化焙烧—弱磁选工艺研究。结果表明:在煤粉与原尾矿的质量比为1.5%、温度为750℃的条件下磁化焙烧60 min,可使原尾矿中绝大部分的镜铁矿和菱铁矿转化为磁铁矿;焙烧矿磨至-0.074 mm占87.36%后经1次弱磁粗选和1次弱磁扫选—粗、扫选所得粗精矿按0.045 mm筛分—筛下物1次弱磁精选—精选精矿与筛上物合并,可以获得铁品位为54.57%、铁回收率为78.97%的最终铁精矿。     

GYX高频振动细筛在河南某铁矿选厂的应用

河南某铁矿矿石中主要铁矿物为镜铁矿和磁铁矿,主要脉石矿物为石英和云母。该矿选矿厂原采用阶段磨矿、阶段选别的弱磁选-高梯度强磁选工艺产出磁铁矿精矿和镜铁矿精矿,但由于难磨且具弱磁性的粗粒含铁云母大量混入镜铁矿精矿,致使镜铁矿精矿的品位低于60%且难以提高,并影响综合精矿品位。为解决这一问题,选矿厂联合广州有色金属研究院开展了相关实验室试验,并根据实验室试验结果,引入GYX21-1210型高频振动细筛和普通型6-S细砂摇床对原选矿工艺流程进行了技术改造,即将原二段高梯度强磁选精矿用细筛按0.074 mm进行筛分,筛下直接作为一部分镜铁矿精矿,筛上经摇床1次选别获得其余镜铁矿精矿,同时抛弃大量尾矿,摇床中矿则返回二段磨矿作业。改造后,镜铁矿精矿和综合铁精矿的铁品位分别达到了60.30%和61.83%,与原流程相比分别提高了3.55和1.98个百分点,同时还使镜铁矿精矿和综合铁精矿的铁回收率分别提高了7.52和7.51个百分点。     

镜铁矿悬浮磁化焙烧过程中的铁物相与磁性转变研究

甘肃某镜铁矿石主要有价元素为铁,TFe含量为59.61%,原矿中94.79%的铁以赤褐铁的形式存在,脉石矿物主要为石英,含量为8.11%。为考察焙烧过程主要影响因素对焙烧产物的物相转化与磁性转变的影响,进行了悬浮焙烧试验。结果表明：镜铁矿经悬浮磁化焙烧后,焙烧产物中铁主要以磁铁矿的形式存在,磁性明显增强;随着焙烧温度升高、焙烧时间延长、CO浓度增加、总气量增加,焙烧产品中镜铁矿含量均逐渐降低,磁铁矿含量均逐渐增加,焙烧产品饱和磁化强度和最大比磁化系数均先提高后降低;在焙烧温度为550 ℃、焙烧时间为4 min、CO浓度为20%、总气量为600 mL/min时,焙烧产物的比饱和磁化强度为63.66 A·m²/kg、最大比磁化系数为5.02×10-4 m³/kg;焙烧过程铁物相按照Fe₂O₃→Fe₃O₄→FeO的反应顺序进行,焙烧产物铁物相的转化会影响铁矿物磁性的强弱,并且主要与磁铁矿的含量相关。试验结果可以为我国镜铁矿资源悬浮焙烧过程机理研究提供理论依据。     

Selective depression action of taurine in flotation separation of specularite and chlorite

Chlorite, as the most representative gangue mineral associated with specularite, of which the separation of these two minerals is difficult. This paper investigated the depression effect of taurine on specularite/chlorite separation via flotation experiments, adsorption tests, contact angle measurements, Zeta potential detection, FT-IR measurements, and XPS analyses. The results of single mineral flotation indicated that chlorite could be depressed selectively by taurine with the recovery of less than 30%, but the floatability of specularite remains high with recovery rate of 81.77% at pH 10. The artificial mixed mineral flotation results confirmed the effectiveness of taurine as a depressant. Surface adsorption, contact angle, and Zeta potential detection revealed taurine primarily adsorbs on the chlorite surface, which hampered the DDA’s subsequent adsorption and results in the chlorite’s poor floatability. The FT-IR spectra and XPS analyses provided further proof that taurine adsorbed on chlorite surface as an electron donor, and part of the electrons transferred from the sulfonic acid group of taurine to metal ions during the adsorption process. In addition, the hydrogen bond between amino-group of taurine and O ions in chlorite surface was also formed in the adsorption process. Finally, optimized adsorption configurations of taurine on chlorite surfaces were proposed.     

安徽李楼铁矿常温浮选药剂应用之路

针对李楼铁矿镜铁矿石浮选使用加温药剂时暴露出的环保压力大、生产成本高等问题，选厂进行了一系列新工艺、新设备的应用和流程优化改造，为使用常温浮选药剂创造了条件。在多种药剂反复试验与优化的基础上，最终选择了鞍山的TD型捕收剂，使浮选矿浆温度由35 ℃以上降至16 ℃，在生产指标略好、药剂成本略降的情况下，年可节约天然气加温费用800万元，且环境效益显著，对国内类似选厂具有一定的借鉴意义。     

A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate

In the paper, the pre-treatment of fine Brazilian specularite concentrates with high iron grade and low impurities through pre-briquetting was proposed to improve the granulation and sintering performance of blends comprising some 30% specularite concentrates. The results show that the excellent sintering indexes are attained as follows in pot tests: productivity of 1.64?t?m^?2?h^?1, tumble index of 59.87% and solid fuel consumption of 71.64?kg?t^?1 under the optimal conditions. Compared with traditional sintering process, productivity and tumble index were increased by 13.88 and 3.5%, respectively, and solid fuel consumption decreased by 4.82?kg?t^?1. The RI and RDI_?3.15 reach 83.95 and 35.02%, respectively, which are superior for blast furnace. The mechanism of the pre-treatment of the specularite concentrates was demonstrated that better permeability was achieved by coarsening granule, more calcium ferrite was formed by basicity segregation and separation addition of coke.     

某共生镜铁矿的反浮选试验研究

赤铁矿反浮选工艺在工业生产实践中获得了广泛的应用。在目前所有的生产实践和研究工作当中，石英是赤铁矿矿石中主要的脉石矿物和浮选对象。本试验针对某含有13％方解石、10％石英和8％绿泥石的铜矿共生镜铁矿，研究了采用反浮选工艺对脉石矿物和镜铁矿进行浮选分离的可能性，获得了比较满意的选矿指标，精矿品位和回收率分别为65．28％和79．05％。采用阴离子捕收剂油酸钠将矿石中的石英和方解石浮选分离以后，采用阳离子捕收剂醚胺浮选绿泥石时呈现出良好的选择性。     

酒钢选矿厂强磁选工艺流程优化研究

酒钢选矿厂强磁选系统采用一次粗选、两次扫选流程处理桦树沟铁矿。目前，在生产中存在着精矿品位及回收率均比较低的问题。根据矿石特性，进行了强磁—高梯度、强磁—高梯度粗细分选及阶段磨矿—强磁—高梯度流程研究，并对这些流程的技术可行性及经济效益进行比较。     

西北某难选铁矿石选矿试验

西北某难选铁矿石中主要铁矿物为磁铁矿和镜铁矿,其中磁铁矿与镜铁矿、镜铁矿与石英嵌布关系密切。对该矿石进行了磨选工艺技术条件研究,结果表明,采用磨矿-1粗1精弱磁选-强磁粗选-强磁粗精矿再磨-强磁精选流程处理,可以获得铁品位为66.39%、回收率为40.94%的弱磁精矿和铁品位为63.41%、回收率为37.27%的强磁精矿,综合精矿铁品位为64.95%、回收率为78.21%。     

河南某铁矿石工艺矿物学研究

为充分利用河南某铁矿资源,对该铁矿石进行工艺矿物学研究。结果表明：①该铁矿石铁品位34.31%,有害元素硫、磷含量较低,属酸性氧化铁矿石,具有回收价值的铁矿物为磁铁矿和镜铁矿,占总铁的88.63%;②磁铁矿呈中等稠密-稀疏或星散浸染状嵌布在脉石中,嵌布粒度较粗,多在0.3～1.5 mm,+0.3 mm粒级占96.79%;镜铁矿主要以中等稠密浸染条带状和稀疏-星散浸染条带状产出,大多呈定向排列特征,粒度细小,-0.30 mm粒级占57.14%;磨矿细度 -0.075 mm 90.33%时,镜铁矿单体解离度在96％以上;③脉石矿物以石英和白云母为主,与铁矿物共生关系简单,为选别创造了良好条件。推荐采用磨矿-弱磁选-强磁选工艺回收磁铁矿和镜铁矿,但应加强对微细粒级的尘粒状镜铁矿的回收,以避免尾矿中铁含量偏高。该矿石工艺矿物学研究结果可为下一步的选矿工艺提供理论支持和技术指导。