尾煤泥两段浓缩、两段回收工艺在梗阳选煤厂的应用

介绍了尾煤泥两段浓缩、两段回收工艺在梗阳选煤厂的应用情况,分析了二段斜管浓缩机和压滤机的工艺性能指标以及该工艺实现清水选煤、尾煤二段回收、弧形筛截粗除杂的三个特点。     

两段浓缩、两段回收模式的煤泥水流程

介绍了选煤厂通常采用的单段浓缩、单段回收模式的煤泥水处理流程存在的局限性,阐述了两段浓缩、两段回收模式煤泥水处理流程中四个作业的主要作用及工艺要求,根据多年的设计经验和选煤厂生产实践,对煤泥水浓缩及粗、细煤泥脱水回收设备的选型提出了看法和建议。     

煤泥两段浮选—两段脱水回收工艺在友谊选煤厂的应用

友谊选煤厂采用了煤泥两段分级浮选、两段脱水回收工艺流程,工业性试验数据表明,将煤泥按粒径粗细进行分级后再脱泥降灰,既稳定了精煤产品的灰分,又避免了可燃体的损失,浮选精煤产率达84.80%。     

"2+2"创新模式的煤泥水流程

介绍选煤厂“2 2”创新模式的煤泥水流程,即精煤泥两段脱水,尾煤泥两段浓缩、两段回收煤泥水流程以及工艺设备的选型和效果。     

“2+2”模式重介质选煤系统煤泥及煤泥水处理首创工艺技术

"2+2"模式重介质选煤系统煤泥两级浮选、精煤泥两段脱水、尾煤泥水两段浓缩两段回收首创工艺技术,在多座选煤厂的应用结果表明,该工艺可解决我国炼焦煤选煤厂长期存在的以浮选精煤为主的精煤泥灰分、水分偏高的难题,可实现煤泥全部厂内回收、洗水闭路循环。     

煤泥二次浮选、精煤泥两段回收流程在梗阳选煤厂的应用

根据生产系统检测的数据,分析并评述了梗阳选煤厂煤泥二次浮选、精煤泥两段回收流程中粒度控制、煤泥粗选、粗精煤泥脱水回收、煤泥部分精选四个主要作业的效果;该流程整体工艺分选指标效果好,能有效回收煤炭资源,解决浮选精煤灰分普遍偏高的问题。     

浮选精煤两段脱水新工艺

分析了沉降过滤式离心脱水机单段脱水回收精煤泥工艺的缺点;详述了沉降过滤式离心脱水机和压滤机组合而成的精煤泥两段脱水新工艺。该工艺增加了离心机入料中的粗精煤泥量,减少了煤泥循环量,可使最终精煤水分降到10%,适用于以重介质旋流器为主选设备的选煤厂;新工艺的基建投资费用低,动力消耗少,劳动效率高,设备运行稳定、可靠。     

沉降过滤式离心脱水机在煤泥二次浮选、精煤泥两段回收系统中的工艺效果

在设有煤泥二次浮选、精煤泥两段回收生产系统的5座选煤厂中,对沉降过滤式离心脱水机进行了工业性试验,并计算出各项工艺指标,分析表明,该设备脱泥、降灰和脱水的工艺效果良好。     

煤泥减量化设计在宁东选煤厂的改造实践

分析了煤泥产量增加对选煤厂生产系统、产品质量、运输存储等方面带来的不利影响;重点从分选前、分选中、分选后三个阶段,分析了采用深度筛分、减少泵力输送、高灰细泥提前分离、两段浓缩、两段回收等煤泥减量化措施的作用;结合神华宁煤集团羊场湾和枣泉两座选煤厂的改造实践,证明了实施煤泥减量化的实际效果和经济效益。     

沉降过滤式离心脱水机在煤泥水二段浓缩二段回收流程中的应用

介绍了常用的煤泥水单段浓缩单段回收流程及存在的问题,分析了煤泥水二段浓缩二段回收流程中所用沉降过滤式离心脱水机的2个重要参数,即转鼓转速和长度对脱水效果的影响,6座选煤厂的煤泥水处理实践表明,煤泥水二段浓缩二段回收工艺可有效降低煤泥水分,提高选煤厂经济效益。     

斜管浓缩机在选煤厂的应用

斜管浓缩机利用倾斜断面作沉降面,扩大了沉降面积,缩短了沉降距离,该机应用在尾煤泥水二段浓缩、二段回收的流程中,可获得良好的水力分级和澄清浓缩工艺效果。     

二塘选煤厂处理易泥化尾煤的研究

通过对二塘选煤厂的原生煤泥、尾煤煤质、压滤参数、循环水浓度等进行监测和分析,针对易泥化煤泥的特性,对尾煤处理的工艺流程、设备的选用和操作进行了改造,在简化生产工艺、提高尾煤处理能力、改善生产用水水质等方面取得了较好的效果,尾煤的泥化程度得到了有效控制,煤泥水絮凝沉降效果明显提高。     

Selenium Flux Effect on Cu(In,Ga)Se2 Thin Films Grown by a 3-stage Co-evaporation Process

An investigation into the effects of Se flux on absorber thin film growth at each step of a 3-stage co-evaporation process was conducted to further optimize the performance of CIGS solar cells. In ‘step I’ forming an In-Ga-Se precursor thin film during the 3-stage process, Se flux affected the preferred orientation of the CIGS crystal structure, but not the film morphology. In ‘step II’, no correlation was found between Se flux and the crystal structure, although excessively high Se flux employed throughout the 3-stage process degraded the solar cell performance. A CIGS thin film, with a (220/204) crystal orientation, minor physical surface defects and ∼20 nm thick MoSe₂ at CIGS/Mo interface, was obtained by fine control of Se flux conditions (high Se flux at ‘step I’ and low Se flux at ‘step II’) at optimum substrate temperatures. The solar cell fabricated using the aforementioned CIGS thin film showed the highest conversion efficiency of 20.02 %.     

望峰岗选煤厂煤泥水系统技术改造的途径和效果

针对望峰岗选煤厂原有煤泥水流程存在的问题和煤泥的特性 ,采取了改原尾煤一次浓缩工艺为二段浓缩 ,浓缩机溢流水既可循环使用又可分流浓缩澄清 ,新增一台高频筛以提高中粗煤泥回收的可靠性以及增设洗水净化再生系统等措施 ,对煤泥水系统进行技术改造 ,实现洗水闭路循环 ,取得了显著的经济、环境和社会效益     

国产P—500双级推料离心机替代进口的尝试

介绍了国产Ｐ－５００离心机在氯碱厂的试用以及根据工艺特点对其所作的改进，替代进口取得了显著的经济和社会效益。     

Development of an innovative 3-stage steady-bed gasifier for municipal solid waste and biomass

Gasification of biomass, municipal solid waste, waste-derived fuels and residues has been lately gaining in attractiveness as an alternative thermal treatment method to produce power and heat. Presented in this paper is a new, recently patented, 3-stage gasification scheme, designed for all aforementioned types of fuels and for producing a synthesis gas free of tar and dioxins. The proposed 3-stage gasification scheme comprises of three stages: i) pyrolysis, ii) combustion and iii) gasification. The proposed 3-stage gasification scheme is valid for municipal solid waste and any type of biomass despite differences in chemical composition. The innovation of this 3-stage gasification scheme is based on the fact that the transition between normal and reverse operation and vice versa is achieved only by the proper rotation settings of four air blowers, thus creating a new model of gaseous flow management between the three aforementioned stages. The presented model can achieve a safe industrial-scale operation while producing a gas free of harmful components. The proposed gasification model is validated as suitable for small-to-medium scale capacities, achieving an overall electrical efficiency of 30% and minimum environmental impacts well below all existing thresholds, including those set by the Directive 2000/76/EC on solid waste incineration.     

强化细煤泥沉降工艺的实践

白龙选煤厂在煤泥水处理流程中,针对入选原料煤中细泥含量不断增加、高灰细泥不能有效沉淀等问题,采用无机凝聚剂CaO和有机絮凝剂聚丙烯酰胺配合添加技术,工艺指标得到了显著改善,浓缩机清水层稳定在1.5~2.0m,溢流浓度达到10g/L,解决了生产难题,底流固体物回收率增加,获得了较好的社会和经济效益。     

Beneficiation of Cassiterite Fines from a Tin Tailing Slime by Froth Flotation

The beneficiation of cassiterite fines from a tailing slime in the Datun concentration plant was studied through a froth flotation process, with the chemical scheme of benzohydroxamic acid as collector, lead nitrate as activator, and pine oil as frother. It was found that tin values are mainly contained in the fine fraction of the sample and cassiterite is mostly associated with iron minerals and calcium minerals, so that the desliming treatment and the addition of dispersants and depressants can not be used as it generally results in the undesired loss of tin values. A novel flotation process with no dispersant and depressant as well as no desliming was developed. It showed that this process was effective in recovering the tin values from the tailing slime assaying 0.18% Sn, and produced a concentrate assaying 3.5% Sn with the recovery of 74.16%. It has been found that pine oil played a significant role in improving the recovery for tin values.