混凝土泵车常见故障探析

分析了混凝土泵车在实际运行中经常发生的故障,并对故障排除方法作了深入剖析.     

汽车覆盖件冲裁修边模铁屑处理方案

分析了在自动化线环境下汽车覆盖件冲裁修边模铁屑产生的成因,介绍一些消除铁屑的处理办法以及效果对比分析,并提出优化的处理方案,在生产中取得良好效果.     

湿法系统除氯工艺技术研究及应用

在锌的湿法冶炼过程中,氟氯的大量存在会造成阴、阳极板腐蚀严重,剥锌困难及析出锌含铅高,严重影响锌电解的正常作业。文章介绍了湖南某炼锌厂在氯的脱除方面进行的工艺研究与应用。通过多种方法——多点除氯工艺的实施,溶液氯含量由800～1000mg／L降至400～500mg／L。     

Synthesis of magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate and its application in removing heavy metal ions

ABSTRACT

This paper describes the synthesis and characterisation of a magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate (M-CSAX) nanocomposite based on magnetic starch (MCS), acrylamide (AM) and sodium xanthate that underwent heavy metal ions removal in response to an external magnetic field. The material was prepared using magnetic particle Fe₃O₄ nanoflakes (NFs) together with vinylated starch and poly(acrylamide)-co-sodium xanthate via an ultrasound-assisted radical crosslinking/polymerisation reaction. MCS was synthesised by a direct compounding method using Fe₃O₄ NFs as nuclear and vinylated starch as shell. The obtained M-CSAX has a saturation magnetisation value of 19.21 emu·g^?1. Flocculation experiment results showed that the composites have functions of removing both turbidity and heavy metal ions from aqueous solution, and can adsorb 78.3% of Pb²⁺ and 63% of Cu²⁺ from the corresponding salt solutions. The findings of the present work highlight the potential for using M-CSAX as an effective and recyclable adsorbent for wastewater treatment.     

脱胶亚麻籽表面胶层脱除方法的研究

脱胶亚麻籽是制备亚麻籽油的原料，脱胶后表层残胶对制油过程产生不利影响，通过调节体系离子强度和离子类型实现脱胶亚麻籽表层残胶脱离效果显著，采用0．25mol／LAl2(SO4)，温度70℃～80℃，处理40min～50min可将亚麻籽表层残胶脱除。     

速冻挂糊鱼的工艺研究

为了解决速冻罗非鱼加工中产生的下脚料——罗非鱼下颚肉的利用问题,研究了以其下颚肉为原料制取方便营养的休闲食品速冻挂糊鱼的工艺过程和方法,通过正交试验和感官评价确定了最佳加工工艺,在此工艺条件下制取的鱼块呈鸡翅状,香酥可口,营养丰富,入口后有种特殊口感,风味独特宜人。     

Method for Production of Polymerization Grade Isoprene via C5 Frac-tion Separation Developed by Shanghai Petrochemical Company

A process for separating ethylene glycol, which is synthesizedfrom syngas, has been developed by the ChinaWuhuan Engineering Company, Ltd. This process coversthe following procedures. The hydrogenate obtainedfrom hydrogenation of dimethyl oxalate is subjected topretreatment involving the recovery of methanol, dehydration,removal of esters of oxalic acid, rectification andrefining to obtain the ethylene glycol product. Dibutylketone used as the azeotropic agent is mixed with theraw ethylene glycol obtained after recovery of methanol,dehydration, and removal of oxalic esters to give the EGdimerizationreaction to convert the remaining cyclopentadieneinto dicyclopentadiene with the remainder undergoingseparation via rectification to extract the remainingisoprene which is concentrated in the tower overhead,while dicyclopentadiene and piperylene are concentrated inthe tower kettle. The isoprene material obtained in the previousphase is further subjected to extractive rectificationand purification to yield the polymerization grade isoprene.The advantage of this method is to effectively inhibit theco-polymerization of isoprene and cyclopentadiene in thecourse of heating and separation to significantly reducethe loss of isoprene and cyclopentadiene.rich azeotrope, which is then subjected to condensationand separation to yield an azeotrope-rich liquid phase andan EG-rich liquid phase. The EG-rich liquid phase is furtherrefined to give a premium EG and an on-spec EG.     

基于基本纸样的女装后片浮余量结构转化分析

 从女装基本纸样的后片浮余量形成入手,分析了利用纸样设计、服装工艺和面料性能三个途径处理后片浮余量的多种方法。提出了女装后片浮余量结构处理应采用以“省道”、“分割线”和“褶皱”等显性而直接的结构处理为基础,结合面料塑形、工艺处理等隐性而间接的手段,通过综合考量,进行多途径、多方式的“余量位移”、“余量消解”和“余量转化”的观点,为提升女装结构设计的科学性和合理性,进一步揭示服装结构设计规律提供了理论依据和实践指导。     

从还原钨钼粉的粒度波动论氢气再生装置

钨和钼的金属粉末生产是用氢气作还原剂。为了使还原反应完全,氢气的流量控制在几倍甚至几十倍的理论需要量,所以氢气需要回收和再生。由于氢是易燃易爆的气体,而还原炉内的温度又高达近千度,更严峻的是因不断地进料出料,炉门时常开启、关闭,因此确保氢气再生装置中氢气的压力与还原反应过程中氢气的流量均保持恒定,成为稳定钨、钼粉粒度的关键。本文对国内外氢气再生装置进行了全面比较,详细地分析了粒度波动的原因。     

利用选择性絮凝脱泥提高金精矿氰化浸出率的生产实践

乌拉嘎金矿金精矿中硫化物包裹金及矿泥含量多,采用常规氰化浸出工艺,浸出率在84％左右;采用金精矿细磨－－选择性絮凝脱泥－－氰化浸出工艺,浸出率可达88％以上。