不同淀粉对混合磁选精矿抑制效果的研究

通过淀粉对赤铁矿的抑制机理分析,经过浮选试验,研究了玉米淀粉、糯玉米淀粉、马铃薯淀粉、木薯淀粉在齐大山铁矿选矿分厂浮选中的作用效果。研究结果表明,各种淀粉对赤铁矿都有一定的抑制作用,各种淀粉的的分子量不相同,支链部分和直链部分的比例不同,是淀粉对赤铁矿抑制作用存在差别的主要原因。     

某赤铁矿尾矿的综合利用

对赤铁矿尾矿采用酸浸—还原工艺,以达到固废资源化、减量化的目的。结果表明:在酸浸过程中,当反应温度为100℃、浸出时间为2.5h、搅拌转速为400 r/min、溶液硫酸浓度为45%、硫酸过量系数为1.5时,全铁回收率达82.3%。在还原过程中,在反应时间为2h、反应温度为50℃、铁屑的过量系数为1.4时,可以制得一等品绿矾产品。     

微细粒赤铁矿的异各凝聚动力学研究

本文以自行设计的适时观察－显微照相装置,对微细粒赤铁矿的异向凝聚过程进行了动态照相,并用图象分析仪测定了凝聚体尺寸,从而更好地揭示了微细粒赤铁矿的异向凝聚过程与凝聚剂浓度、浆体浓度、ｐＨ值等之间的关系。     

湿法炼锌赤铁矿法沉铁行为

湿法炼锌工艺过程中赤铁矿法沉铁技术是一种沉淀渣量小、分离效率高的锌、铁分离方法。针对湿法炼锌工艺过程中赤铁矿法沉铁技术开展了硫酸亚铁的氧化水解沉淀行为的研究,考察了时间、酸度、温度、硫酸盐浓度、晶种返回量等主要因素对赤铁矿法沉铁效果的影响、沉淀产物的析出特性和物相表征。     

利用湿法炼锌赤铁矿法沉铁渣制备铁红

湿法炼锌工业中产生的沉铁渣的资源化利用,长期以来是备受关注的问题,渣的堆积容易对环境产生污染。目前主流的三种沉铁方法中的赤铁矿法所产生的赤铁矿渣具有较高的利用回收价值,对其的资源化利用,具有较高的研究价值。本文以湿法炼锌赤铁矿渣为实验对象,探究其在一定条件下使用酸洗浸出的方法制备高纯度铁红颜料的可行性,针对其中主要的杂质硫、锌等,以及不同含铁物相的去除与转化,研究了温度、时间、酸度、液固比对杂质脱除效果的影响。结果表明,在酸度8 g/L硫酸、温度220 ℃、时间3 h、液固比为6 mL/g工艺条件下可获得较好的脱杂提纯效果,可将沉铁渣铁含量由58%提高至66.5%以上,渣中主要杂质硫脱杂率在70%以上,锌等其余杂质脱除率在90%以上。     

平行和垂直交叉排列组合棒介质高梯度磁选对比研究

为研究棒介质排列组合对高梯度磁选效果的影响,应用"单元介质分析法",选择铁品位38.10%的细粒赤铁矿,进行棒介质丝平行与垂直交叉排列组合对比研究。结果表明,与单一丝径棒介质比较,不同丝径组合式棒介质可以兼顾对不同粒级磁性矿粒的选择性捕获,有利于提高分选指标,且组合程度越高,提升分选指标越明显;介质丝平行与垂直交叉排列组合各有特点,后者捕获概率大些,但夹杂现象多些,因此精矿产率和铁回收率更高,但精矿品位更低。     

某残坡积铁尾矿再选流程考查及工艺优化研究

对某厂残坡积铁尾矿再选生产工艺流程,采用生产统计、取样化学及物相分析、粒级筛析考查等方法进行流程查定,查明各作业及单机的选别效率,各作业产品铁品位、金属分布率、金属流向及影响因素,根据查定及试验结果对现有流程提出优化改进的建议,通过改造取得较好的技术指标和经济效益。     

Screening of biohydrogen production based on dark fermentation in the presence of nano-sized Fe2O3 doped metal oxide additives

Increasing the biohydrogen production efficiency through the dark fermentation process has become the biggest challenge in recent years. We aim to enhance biohydrogen production yield by adding nano-sized iron oxide doped metal oxides prepared by the wet impregnation method. Biohydrogen production in the presence of additives was evaluated by the screening of (i) type (Fe₂O₃@Al₂O₃, Fe₂O₃@ZrO₂, and Fe₂O₃@TiO₂) and (ii) concentration (0–200 mg/L) of additives. During the screening of additive type, approximately 14 wt% nano-sized (6 nm) hematite (Fe₂O₃) doped Al₂O₃ showed the highest improvement for biohydrogen production yield among all additives. Batch experiments conducted through dark fermentation demonstrated that 50 mg/L Fe₂O₃@Al₂O₃ addition caused an acceleration in biohydrogen production by 34% and an increment in yield by 15%, despite even low concentrations Al₂O₃ addition inhibited the process.     

Slon－2000立环脉动高梯度磁选机分选弓长岭贫赤铁矿的工业试验

Ｓｌｏｎ－２０００立环脉动高梯度磁选机属我国自行研制的新型高效大型强磁选设备．该机在弓长岭选矿厂完成了六个月分选贫赤铁矿的工业试验，与Ｓｈｐ－２０００平环强磁选机比较，在给矿性质相同条件下，该机精矿品位提高７．２１个百分点，尾矿品位降低５．４１个百分点，作业回收率提高７．３６％，该机磁介质不堵塞，设备作业率达９８．８％，克服了平环强磁选机磁介质易堵塞和长期难以解决的设备作业率较低的问题．     

Statistical analysis and concentration of iron ore using Longi LGS 500 WHIMS

A Longi LGS 500 wet high intensity magnetic separator(WHIMS) was used to concentrate a fine, low grade South African hematite ore. The ore was prepared into different size fractions and was subjected to changes in pulp density, magnetic field intensity and pulsation frequency which followed a 33 full factorial matrix. The concentrate mass yield and Fe grade were selected as the dependent responses to the changes. The analysis of variance(ANOVA) shows that the variables investigated are significant to the material's response to magnetic separation. This significance was in the order of magnetic field intensity followed by pulsation frequency and then pulp density. It was also noted that a single stage magnetic separation has a potential to upgrade a feed( 75 lm and 40% Fe) to a 55% Fe grade, as the pulsation frequency increases. In addition, the model predictions and actual data were in good agreement, reporting regression coefficients within acceptable ranges.