Recovering limonite from Australia iron ores by flocculation-high intensity magnetic separation

Successful recovery of limonite from iron fines was achieved by using flocculation-high intensity magnetic separation （FIMS） and adding hydrolyzed and causticized flocculants according to the characteristic of iron fines. The separation results of the three iron samples are as follows： iron grade 66.77%- 67.98% and the recovery of iron 69.26%-70.70% by the FIMS process with flocculants. The comparative results show that under the same separation conditions the F1MS process can effectively increase the recovery of iron by 10. 97%- 15.73%. The flowsheet results confirm the reliability of the process in a SHP high intensity magnetic separator. The concentrate product can he used as raw materials for direct reduction iron-smelting. The hydrolyzed and causticized flocculants can selectively flocculate fine feebly-magnetic iron mineral particles to increase their apparent separation sizes. The larger the separation size, the stronger the magnetic force. By comparing the separation results of the three samples it is found that among the three samples the higher the limonite content, the better the separation result. This means that the separation result relates closely to the flocculation process and the adding pattern of the flocculant.     

高炉煤气洗涤水的化学处理

针对天铁高炉煤气洗涤水结垢原因做了详细分析，对高炉煤气洗涤水化学处理工艺做了介绍。采用絮凝-阻垢分散处理高锌煤气洗涤水可降低结垢速度。     

Effects of symmetrically alternative rotating flow on flocculation

1　INTRODUCTIONTheflocculationisusuallydefinedasaprocessinwhichthedestabilizedsolidparticlesareaggregatedbythebridgingofpolymericflocculants .Theformationofflocsisdeterminedbytwosteps.Oneistheap proachingandcollision ,theotheristheflocgrowing .Thecollisionisachievedbythreemechanismsinclud ingtheBrownianmotionof particles ,namedasperikineticflocculation ;thedifferencesinsettlingve locityofparticleswithvarioussizes ,socalleddiffer entialsettlingandtheimposedfluidvelocitygradientsfrommixing …     

极细粒煤泥脱硫研究

介绍了选择性絮凝脱硫的研究结果．本法可较好地脱除单体解离的黄铁矿硫，脱硫率可达８０％以上，精煤硫分有较大幅度降低，可由２％左右降到０．７％～０．８％甚至０．５％以下．本法还可同时脱灰，且脱硫脱灰均具有很好的效果．因此，是一种较理想的细粒和极细粒煤泥的分选方法．     

"三级中和"工艺技术在葫芦岛锌厂制酸污水治理方面的应用与研究

详细介绍了“三级中和”工艺在锌厂制酸污水治理方面的开发与应用。评述了“三级中和工艺的合理性和科学性，其次论述了系统的调试及试生产过程，以及污水处理过程全部实现自动化操作的先进性。     

生物除铬的机理研究

本论文主要是研究厌氧微生物作为生物絮凝剂吸附六价铬的吸附特性及机理。污泥中的微生物以杆菌为主。污泥吸附沉降性良好。污泥在吸附时间40 min内,不会解析,吸附效果最好。在污泥吸附能力达到饱和时,加入营养经过一段时间后,其吸附能力会部分恢复。     

Sludge Dewatering and Aggregate Formation Effects through Taylor Vortex Assisted Flocculation

Abstract

For polymer induced flocculation processes, the effects of flow patterns in a gap of a conical stirrer on aggregate formation and subsequent sludge dewatering efficiency were analysed. Different flow regimes were identified by lab scale investigations with model substances and summarized in a Ta and Re number plane. An enhancement of sludge dewaterability for polymer induced flocculation processes was identified through post‐treatment of flocculated sludge aggregates by the specific flow pattern of stable and wavy Taylor vortices. Photo‐optical image analysis of flocculated aggregates shows a clear change of aggregate size distribution with less small particles during aggregate forming by Taylor vortices compared to classical flocculation procedure by stirrer. Results from technical scale dewatering analyses confirmed enhancement of sludge dewatering efficiency for six different dewatering machines using the identified wavy and stable Taylor vortex flow pattern regime.     

用弗雷德盐沉降去除水体中镉的絮凝形态

用微/纳结构的弗雷德盐乳液作吸附-絮凝剂以絮凝法去除水体中重金属镉。结果表明,弗雷德盐絮凝沉降镉的去除率达97.8%。背散射与点能谱的研究表明,弗雷德盐在水处理过程中经历了溶解-再结晶,形成稳定性更高的六方柱形方解石和无定型氢氧化铝。水体中部分镉离子吸附或共沉淀在六方柱形方解石表面;另有部分镉离子吸附或共沉淀在水解生成的无定形氢氧化铝胶体中。XRD谱图比较证实,还有部分镉以类质同象取代方解石中的钙进入晶格。     

微生物絮凝剂产生菌的筛选及培养条件优化

从某印染废水处理系统二级沉淀池污泥中筛选得到菌株C-6,其发酵产生的生物絮凝剂絮凝活性高且稳定,对高岭土、蒙脱土、活性炭和泥浆4种悬液的絮凝率分别达95.31%、93.49%、89.89%、93.49%。经形态学鉴定,该菌种可初步确定为黑曲霉。培养基组成及发酵条件优化试验表明,以葡萄糖为碳源,硫酸铵+酵母粉+尿素为氮源,初始p H值为7.0,接种量为2%,培养温度为35℃,以150 r/min的转速振荡培养52 h,菌株质量浓度可达4.803 g/L,发酵液对高岭土悬液絮凝率增至98.61%。扫描电镜显示分散的高岭土颗粒经絮凝产生的絮体大而密实,可快速沉降。     

山西省洪洞县广胜寺镇水厂净水工艺设计分析

根据洪洞县广胜寺镇水源现状,通过对水处理工艺进行分析,提出采用微絮凝过滤作为水厂处理工艺,经比选最终确定了净水车间及加药加氯间各部分设计参数,对同类型水厂有一定参考价值。