动筛跳汰机技术创新的探索与实践

岱庄煤矿选煤厂针对动筛跳汰机存在缓冲油缸损坏频繁、筛体振幅调节不便、压力传感器与阀体直接相连、主提升油缸活杆与缸头脱节、筛板与框架结构为一整体等问题,采取了一系列有效的改造措施;改造后的动筛跳汰机运行稳定,振幅调节灵活方便,分选效果显著提高。     

无筛板槽体跳汰机

已申请专利的槽体跳汰机,是一种无筛板的跳汰机,具有分选各品种煤和各粒级煤,处理量很高,以极少的投资,能获得很大的技术经济效果等特点,它使一百多年的跳汰选煤技术产姓了新的突破。     

改造跳汰机筛板 提高分选效果

为了提高跳汰机的工作效果 ,对跳汰机的筛板进行了改造 ,将原来的钢板钻孔筛板改为不锈钢焊接的筛网筛板 ,同时改变了跳汰机的工艺参数。结果证明 ,跳汰机的工作效率提高 ,事故率明显降低 ,洗选效果改善 ,取得了良好的经济效益和社会效益     

降低矸石带煤率的方法

中国目前入选原煤中60%左右是跳汰洗选。在跳汰选煤过程中,影响跳汰机分选效率的因素有入料原煤特性,跳汰机风阀周期特性(跳汰频率及进、排气时间),矸石段、中煤段排料情况,各室顶水情况,风压、水压等,并且诸因素间相互制约,再加上人为因素的影响,既兼顾精煤质量又提高分选效率非常困难。以济三煤矿选煤厂BATAC跳汰机为例,通过改善风量与水量的配比,改造跳汰机筛板,稳定床层的同时,保证了精煤灰分,矸石带煤率由原先的6%降至5%以下,提高了精煤回收率,为选煤厂带来明显的经济效益。     

德国BATAC跳汰机的技术改造

兴隆庄煤矿选煤厂应用的BATAC跳汰机存在磨损严重、分选效率低等问题,采用X系列筛下空气室跳汰机的基本机型对其进行更新改造,同时保留部分配套设备;改造后跳汰机的各项技术指标得到了较大改善,提高了分选精度、数量效率和单机处理能力,降低了矸石带煤损失,获得了较好的经济和社会效益。     

动筛跳汰机及其应用推广前景

简述了动筛跳汰机的结构、工作原理及应用效果 ,认为动筛跳汰机在井口 (或井下 )毛煤排矸、动力煤 (或块煤 )分选及干旱缺水地区的煤炭分选等方面具有较好的应用推广前景。     

跳汰机自动排料装置在兴县选煤厂的安装与应用

介绍了兴县选煤厂跳汰机原人工排料存在的各种问题,论述了自动排料装置的主要构成和工作原理,分析对比了自动排料装置安装应用前后跳汰机的分选结果;自动排料装置应用后,提高了原煤分选效果,减少了精煤损失,稳定了精煤灰分,提高了原煤处理量,减轻了工人的劳动强度。     

X型筛下空气室跳汰机

介绍了Ｘ型筛下空气室跳汰机机体、风阀、筛板、排料系统等方面的设计特点及其在有关洗煤厂的实际应用情况。     

动筛跳汰机在张集选煤厂的应用

动筛跳汰机自动化程度高，操作简单，可实现大块物料精确分选和自动排料。介绍了动筛跳汰机在张集选煤厂的应用过程和应用效果。     

用放射性同位素控制跳汰机排料的研究

<正>装有常规排料装置的跳汰机,其分选效果不如重介质分选机。随着跳汰过程的改进和新型排料装置的使用,跳汰机的分选效果显著提高,因此分选精度就不再成为选择跳汰或重介选煤法时的唯一依据了。要使跳汰机有良好的分选效果,其先决条件在于给煤量均匀和原煤的密度组成波动很小。要满足这两个条件,只有在洗煤机前设给煤机和配     

基于灰色系统理论的磷建筑石膏基胶凝材料组分优化设计研究

以云南磷石膏为主要原料制备磷建筑石膏基胶凝材料.通过应用灰关联分析法分析磷建筑石膏基胶凝材料的组分(复合硅酸盐水泥、普通硅酸盐水泥、矿渣硅酸盐水泥、硅灰、粉煤灰、磷建筑石膏)对其绝干抗压强度的影响,确定了掺合料最佳组合为粉煤灰、矿渣硅酸盐水泥、硅灰;并运用多目标智能加权灰靶决策模型综合考虑抗压强度、抗折强度、初凝时间、终凝时间、软化系数、孔隙率六个指标,确定了其最佳配合比.试验表明:当粉煤灰:矿渣硅酸盐水泥:硅灰:磷建筑石膏的配合比为6%:5%:3%:86%时,其综合性能最好,绝干抗压强度为14.11 MPa,抗折强度为2.58 MPa,初凝时间为16 min,终凝时间为43 min,软化系数为0.51,孔隙率为23%.     

Characteristics of Fatty Acid Composition of the Deep-Sea Vent Crab, <Emphasis Type="Italic">Shinkaia crosnieri</Emphasis> Baba and Williams

The neutral and polar lipids of the Galatheidae vent crab, Shinkaia crosnieri, with its eggs were studied to assess its lipid physiology and trophic relationship at hydrothermal vents. The vent crab obtained many of its lipids from Bathymodiolus mussels and chemosynthetic microorganisms which live on a mat of long, silky setae on the crab body as exosymbionts. In all lipid classes, the major monounsaturated fatty acids were 16:1n-7 and 18:1n-7, which originate from bacteria. The major polyunsaturated fatty acids (PUFA) in the triacylglycerols were 16:2n-4, 18:2n-4, 18:2n-7, 18:3n-4,7,10, and 16:2n-3, while those of the crab polar lipids were 16:2n-4, 18:2n-4, 18:3n-4,7,10, 20:4n-6 (arachidonic acid), 20:5n-3 (icosapentaenoic acid), and 22:6n-3 (docosahexaenoic acid) in the phosphatidylethanolamine, and 16:2n-4, 18:2n-4, and 18:3n-4,7,10, with noticeable levels of 20:4n-6, 20:5n-3, and 22:6n-3 in the phosphatidylcholine. In the crab and its eggs, TAG and phospholipid PUFA consisted primarily of n-4 family (n-4 and n-7) methylene-interrupted PUFA with n-3 and n-6 PUFA. The unique fatty acid composition mix of n-3, n-4, and n-6 PUFA in S. crosnieri lipids suggests the vent crab utilizing chemosynthetic bacteria, which produce both unusual n-4 and normal n-3 and n-6 PUFA. Such unique fatty acid composition differs from that reported for other common marine animals, which depend on organic matter derived from phytoplankton lipids.     

植物多糖的纯化工艺研究进展

现阶段纯化工艺一般为:脱脂、脱色、脱蛋白、分离。本文综述了纯化工艺中各步骤的常用方法及应用情况,分析它们的原理及优缺点并对发展前景做进一步探讨。     

重金属离子捕集剂处理含Cu2+废水的工艺研究

目的：合成水溶性二硫代氨基甲酸钠螯合树脂（DTCR）,评价其对含铜废水的处理效果。方法：利用含铜废水考查自合成物（DTCR）的除铜能力。控制废水pH值、重捕剂以及絮凝剂（聚丙烯酰胺）加入量,搅拌一定时间后,静置,过滤,采用原子吸收法测定滤液中Cu2＋的含量。结果：在反应时间为6小时,重捕剂加入量为0．3mL,聚丙烯酰胺（浓度为0．9mg／L）加入量为0．8mL,pH值为4-10时,废水中Cu2＋的去除率可达到98％以上,经过处理的废水达到国家排放标准（GB8978-1996）。     

液态渣的组成,结构与活性的研究

用现代测试技术对电厂液态渣的结构进行了系统分析,较深入地研究了液态渣的组成、结构与活性的关系。     

无水氯化镧铈晶体的制备

用氯化铵氯化法制备出高纯无水氯化镧(铈)粉料,并以其为原料,用石英坩埚下降法生长出无色透明的掺3价铈的氯华镧(LaCl3:Ce)晶体.经测试,LaCl3:Ce样品的透过率达到80%,用137Cs发射源发射的γ射线激发LaCl3:Ce样品,得到的能量分辨率约为3.5%,晶体的光产额约为(6 510±50) photon-electrons/MeV,与碘化钠(铊)晶体(NaI:T1)相当.晶体的光学性能和闪烁性能表明:采用氯化铵氯化法制备的无水氯化镧(铈)粉料可直接用于晶体生长,而且生长出了高质量的LaCl:Ce晶体.     

硅溶胶结合浇注料的流变性能研究

对高纯硅溶胶电熔莫来石细粉泥浆的流变性能研究表明：这种泥浆是存在触变结构的高浓度胶溶悬浮体系，在受较低剪切力作用时产生的是粘滞流动，总的表现符合Ｂｉｎｇｈａｍ流变方程。研究还表明：少量超细粉的加入不改变泥浆的流变模型，但能有效地改善其流变性能，不同的超细粉影响力不同，且这种改善作用有一最佳加入量（活性ＳｉＯ２超细粉影响力大于活性Ａｌ２Ｏ３微粉，其最佳加入量分别为２％和１０％），超过这一加入量将导致流变常数上升，使其流变性恶化。     

Characteristics of the Fatty Acid Composition of a Deep-Sea Vent Gastropod, <Emphasis Type="Italic">Ifremeria nautilei</Emphasis>

Neutral and polar lipids in the soft parts of a gastropod species, Ifremeria nautilei, collected from deep-sea hydrothermal vents, were examined to assess the trophic relationships in hydrothermal vents. The vent gastropod obtains many of its lipids from symbiotic chemosynthetic microorganisms. The major polyunsaturated fatty acids (PUFA) both in the triacylglycerols and phospholipids of the gastropod consist of a limited number of n-3 and n-6 PUFA: arachidonic acid (20:4n-6), icosapentaenoic acid (20:5n-3), and docosapentaenoic acid (22:5n-3), without docosahexaenoic acid (DHA, 22:6n-3). Noticeable levels of various n-6 PUFA, such as 18:2n-6,9, 20:2n-6,9, 20:3n-6,9,12, and 20:3n-6,9,15 with significant levels of 16:1n-6 and 18:1n-6 indicate the biosynthetic characteristic of the endosymbionts. The lack of DHA in all specimens suggests a limitation of its lipid biosynthesis ability with its symbionts. This finding with regard to the lipids is unusual for a marine animal in the grazing or detrital food chain because many marine animal lipids evidently contain high levels of DHA with low levels of n-6 fatty acids. Such contradictory findings lead to some new insights into the absence of a biosynthetic pathway for DHA in I. nautilei, and provide evidence that DHA in this species is dispensable. Similar to herbivorous gastropods, the lack of DHA with significant levels of n-6 PUFA in this species also indicates its selective assimilation of specific microorganisms, such as chemosynthetic bacteria in hydrothermal vents, because significant levels of DHA were found in carnivorous mollusk lipids.     

Physical and mechanical properties of plasticized butenediol vinyl alcohol copolymer/thermoplastic starch blend

The poly(vinyl alcohol) (PVOH) is an eco‐friend polymer and has an excellent oxygen barrier property due to its strong intermolecular force, but difficulty in processing with conventional extrusion process gives it a limitation for various industrial applications, especially packaging industry. Many studies have attempted to plasticize PVOH to improve its processability, but high cost of PVOH is still drawback for a variety of industrial applications. Therefore, PVOH often blended with other biodegradable polymers such as starch to acquire the cost benefit. Nowadays, the butenediol vinyl alcohol copolymer (BVOH) is getting a great attention due to its melt processability and bio‐degradability, but its high cost is barrier to the industrial application as well. In this study, thermoplastic starch (TPS)/plasticized BVOH (P‐BVOH) were prepared by melt mixing technique, and the plasticization effect of glycerol on starch and BVOH with different composition was observed for optimized processing condition. Based on our preliminary study, TPS was blended with varying amount of P‐BVOH (100:0, 90:10, 80:20, 70:30, 60:40, and 50:50 weight ratio). Physical, oxygen barrier, and mechanical properties of the TPS/P‐BVOH blends were evaluated by various analytical instruments to achieve balanced property and performance. J. VINYL ADDIT. TECHNOL., 25:109–116, 2019. © 2018 Society of Plastics Engineers     

粉煤灰在土壤修复与改良中的应用

在系统分析粉煤灰物理化学性质及矿物组成的基础上,分别从粉煤灰单一施用、粉煤灰与若干固体废弃物配施两个方面阐述了粉煤灰在土壤修复与改良中的应用,并提出了目前粉煤灰用于修复和改良土壤存在的问题。