Research and practice on the vacuum filter in emulsion system for tandem cold strip mill

This paper introduces working principle and technical features of vacuum filter in emulsion system for tandem cold strip mill.Based on specific cases,this paper analyses and assesses the effect before and after using the emulsion system with the usage of the vacuum filter for strip mill.Compare with the effect when using the first generation vacuum filter,the emulsion quality is improved significantly by using the second generation vacuum filter,which at the same time ensures steady operation of the rolling mill and surface quality of the mill products. As a result,investment and running costs are lowered,emissions of the waste emulsion are reduced,waste water treatment costs are reduced and so as the environmental pollution.It can be seen the second generation vacuum filter has obvious economic and environmental benefits.Therefor,it suggests that the filter should be used widely in the field of automotive,environmental protection rolling steel and nonferrous metals.

Plasma diagnosis of tetrahedral amorphous carbon films by filtered cathodic vacuum arc deposition

Filtered cathodic vacuum arc(FCVA)deposition is regarded as an important technique for the synthesis of tetrahedral amorphous carbon(ta-C)films due to its high ionization rate,high deposition rate and effective filtration of macroparticles.Probing the plasma characteristics of arc discharge contributes to understanding the deposition mechanism of ta-C films on a microscopic level.This work focuses on the plasma diagnosis of an FCVA discharge using a Langmuir dualprobe system with a discrete Fourier transform smoothing method.During the ta-C film deposition,the arc current of graphite cathodes and deposition pressure vary from 30 to 90 A and from 0.3 to 0.9 Pa,respectively.The plasma density increases with arc current but decreases with pressure.The carbon plasma density generated by the arc discharge is around the order of10^(10)cm^(-3).The electron temperature varies in the range of 2-3.5 eV.As the number of cathodic arc sources and the current of the focused magnetic coil increase,the plasma density increases.The ratio of the intensity of the D-Raman peak and G-Raman peak(I_(D)/I_(G))of the ta-C films increases with increasing plasma density,resulting in a decrease in film hardness.It is indicated that the mechanical properties of ta-C films depend not only on the ion energy but also on the carbon plasma density.

Optical and electrical properties of BaSnO_(3) and In_2O_(3) mixed transparent conductive films deposited by filtered cathodic vacuum arc technique at room temperature

For the crystalline temperature of BaSnO_(3)(BTO)was above 650℃,the transparent conductive BTO-based films were always deposited above this temperature on epitaxy substrates by pulsed laser deposition or molecular beam epitaxy till now which limited there application in low temperature device process.In the article,the microstructure,optical and electrical of BTO and In_(2)O_(3) mixed transparent conductive BaInSnO_(x)(BITO)film deposited by filtered cathodic vacuum arc technique(FCVA)on glass substrate at room temperature were firstly reported.The BITO film with thickness of 300 nm had mainly In_(2)O_(3) polycrystalline phase,and minor polycrystalline BTO phase with(001),(011),(111),(002),(222)crystal faces which were first deposited at room temperature on amorphous glass.The transmittance was 70%–80%in the visible light region with linear refractive index of 1.94 and extinction coefficient of 0.004 at 550-nm wavelength.The basic optical properties included the real and imaginary parts,high frequency dielectric constants,the absorption coefficient,the Urbach energy,the indirect and direct band gaps,the oscillator and dispersion energies,the static refractive index and dielectric constant,the average oscillator wavelength,oscillator length strength,the linear and the third-order nonlinear optical susceptibilities,and the nonlinear refractive index were all calculated.The film was the n-type conductor with sheet resistance of 704.7Ω/□,resistivity of 0.02Ω⋅cm,mobility of 18.9 cm2/V⋅s,and carrier electron concentration of 1.6×10^(19) cm^(−3) at room temperature.The results suggested that the BITO film deposited by FCVA had potential application in transparent conductive films-based low temperature device process.

STUDY ON DIAMOND LIKE CARBON THIN FILM BY FILTERED VACUUM ARC DEPOSITION

Diamond like carbon thin film is successfully deposited on silicon, titanium and stainless steel substrate at low temperature in a filtered vacuum arc deposition system. Arc discharges are established on a graphite cathode in the system with a toroidal macroparticle filter. A cathode activating magnetic field and a filtered magnetic field to collimate the plasma beam are applied. Ion current convected by the plasma beam is measured with a negatively biased probe. It is shown that the magnetic field of the coils located on the plasma duct has a strong influence on cathode spot behavior. Orthogonally the designed experiments are carried out to optimize the deposition parameters of arc stability. Finally, the diamond like carbon thin films are studied by scanning electron microscope (SEM) and Raman spectrum.

Experimental Research of DLC Film Deposited by Filtered Vacuum Arc Evaporation

Diamond like carbon (DLC) films was grown successfully on silicon, titanium and high speed steel (HSS) substrate at low temperature in a filtered vacuum arc deposition system. Arc discharges were established on a graphite cathode in this home built system with a toridal macroparticles filter. Ion current convected by the plasma beam was measured with a negatively biased probe. It was shown that the magnetic field of the coils located on the plasma duct has a strong influence on ion current. Scanning electron microscope (SEM), atomic force microscope (AFM) and Raman spectrum are used to study the DLC films. Tribological behaviors of the deposited film are also studied.

水平带式过滤机真空系统优化改进

水平带式过滤机是制备分子筛的关键过程设备,主要用于分子筛浆液的固液分离,同时实现离子的相互交换。针对水平带式过滤机现有真空系统存在的操作复杂、离心泵故障频繁、环境噪声大等问题,通过翼阀直径核算、真空蝶阀移位、缓冲接液罐体积核算、重力流管道直径核算进行优化设计并对系统实施改造,解决了实际问题,改善了生产操作环境,提高了真空系统自控稳定性。

负压封闭引流联合威伐光治疗难愈性创面的临床效果观察

目的:观察负压封闭引流(VSD)联合威伐光(wIRA)治疗难愈性创面的临床效果。方法:选取2020年1月—2023年1月遂宁市中心医院收治的64例难愈性创面患者,按住院顺序排列,分为试验组和对照组,每组32例。试验组清创术后实施VSD+wIRA治疗,对照组清创术后实施换药治疗。观察两组肉芽生长速度、创面愈合速度、治疗时间以及临床换药次数。结果:试验组治疗第7天创面肉芽生长情况评分高于对照组,差异有统计学意义(P<0.05);试验组行Ⅱ期手术闭合创面的时间短于对照组,差异有统计学意义(P<0.05);试验组行Ⅱ期手术术前1d创面肉芽组织生长情况评分低于对照组,差异有统计学意义(P<0.05);试验组换药次数少于对照组,差异有统计学意义(P<0.05)。结论:VSD技术联合wIRA治疗难愈性创面的疗效确切,能缩短病程,是一种较理想的治疗方式。

双碱法脱硫工艺提标改造与实践

介绍了淄博铁鹰球团制造有限公司双减法脱硫工艺技术改造过程和应用实践。通过对脱硫工艺的石灰浆液制备及输送系统、SO_(2)吸收系统、石膏脱水系统、工艺水系统、电气及自动控制系统等关键环节技术创新与改造,有效解决了脱硫能力不足、压滤效果差、塔体及喷淋管路结晶严重、工艺水平衡困难等运行难题,并实现了由双减法向石灰-石膏法脱硫工艺过渡,满足了生产需要,降低了脱硫运行成本。

浅谈水平带式真空过滤机的技术改造

水平带式真空过滤机在生产过程中发挥了其降能耗、降水分的优势,成为固液物料分离的主流设备。本文主要结合水平带式真空过滤机使用情况,针对布料不均匀、滤布褶皱等问题研究和探讨,对关键部位进行技术改进,使其效能得到更好的发挥。

钠化焙烧提钒工艺过滤系统的优化

针对钒渣钠化焙烧提钒工艺过滤系统钒回收率低、运行成本高等问题,结合产线现有流程装备,对球磨浸出和板框过滤系统进行了升级改造。为避免在输送过程中杂物堵塞、提高料浆输送和过滤洗涤效率,球磨浸出系统加装滚筒筛去除浆液中大颗粒物料及杂物,使用水力旋流器将胶体及细小颗粒分离。研究了回转窑出料量对水力旋流器设备匹配的影响,经过优化调整试验,沿过滤带运动的垂直方向两侧各布置3台水力旋流器,出口直径分别为25 mm和35 mm。板框过滤机被真空带式过滤器替换后,设备维护费用降低83.65%,同时研究了工艺参数对过滤效率和钒收率的影响,在真空带15 mm料层厚度和梯度洗涤最优工艺条件下,尾渣中钒平均含量从0.1%降至0.087%,钒收率提高0.53%,实现了浆料过滤过程高效率运行。

细菌过滤器对医用真空废气排放安全的影响

目的:论证细菌过滤器对医用真空废气安全排放的影响。方法:取直径为9cm的普通琼脂培养皿20个,编成1~20号。其中,1~10号为A组,采集无细菌过滤器废气排放菌落数;11~20号为B组,采集有细菌过滤器废气排放菌落数。将培养皿放置在离废气排放口30cm处沉降30s后封盖,送微生物室,对比两组菌落数;运用T检验进行统计分析,如果P值<0.05即具有统计学意义。结果:A组菌落数平均值为5.6,B组菌落数平均值为5.8,P值<0.05。结论:细菌过滤器对医用真空废气安全排放具有重要作用。

The Properties of the Rectangular Arc Ion Plating with Magnetic Filtering Shutter

A major obstacle to the broad application of cathodic arc plasma deposition is the presence of macroparticles. In this paper, the properties of the large rectangular arc ion plating with a magnetic filtering shutter system to filter macroparticles are studied. It is proposed that the macroparticles in the plasma beam are effectively removed with the magnetic filtering shutter system, and the quality of the deposited films is improved.

秘鲁某特大铜矿尾矿脱水系统方案对比研究

为了选择经济合理的尾矿脱水工艺,降低尾矿脱水工序成本,针对秘鲁某特大型铜矿尾矿脱水问题,进行了不同尾矿脱水工艺方案的投资和运行成本对比,得到了大型尾矿脱水工程建造和运行的最优方案,证明GPYK800真空过滤机方案最为经济,可为新形势下的大规模矿山企业尾矿脱水方案提供经验借鉴。

硫膏生产工艺真空过滤机装置运行优化研究

真空过滤机是将天然气脱硫系统中的硫磺浆进行固液分离的设备。硫磺浆分离之后得到硫膏和滤液。在现场使用过程中出现了如下问题:1)在生产硫膏时,产出的硫膏含水率较高,可能造成污染;2)真空过滤机运行过程中出现异常振动。针对上述问题,从真空过滤机运行参数、设备性能以及设备异常振动等方面进行优化,具体为:1)控制硫膏生产时的进料速度、驱动轮转速等运行参数;2)控制设备结构参数,包括对滤液支管弯头进行限流,将通径65 mm缩小为25 mm,以及将孔径为30μm的滤布更换为12μm;3)依据现场工况调整阀门开度,同时定期维护保养,消除真空过滤机异常振动问题。通过采取上述控制优化措施,真空过滤机产出的硫膏含水率由高于35%降至低于25%,设备振动值由高于10 mm/s降至低于7.1 mm/s,硫膏含水高、振动大的问题均得到解决。

污泥深度脱水技术研究进展

伴随着国家对污泥处置及资源化管理要求提高,如何降低污泥含水率、减少污泥体积成为重点问题,实现污泥深度脱水是有效解决此问题的途径之一。传统的污泥处理技术存在脱水极限,对干燥设备的性能要求也随着含水率降低而提高,找到一种低能耗、高效率的深度脱水方法成为当下急需解决的问题。借鉴国外在物料深度脱水的理论与应用,在我国现阶段高压板框深度脱水技术与热压干化技术的基础上,提出污泥真空压滤联合过热蒸汽高效脱水技术。该技术能在同一设备上完成机械压力过滤与热力干燥脱水,更加节能、高效、环保。

梅钢乳化液系统存在问题的分析及改进

针对乳化液系统使用过程中存在的精细冷却、真空过滤机及整个乳化液系统运行不稳定、维修费用高等问题,提出了相应的改进措施。通过对乳化液系统精细冷却活塞、阀体排气孔和过滤系统等进行改进,并对真空过滤机液位计进行改造。实践运用表明,酸轧机组轧制油耗降低10%,精细冷却喷嘴无长期异常喷射,工作辊异常更换率降低20%,实现了乳化液系统稳定运行。

机械真空泵除尘系统的设计和优化改进

机械真空泵系统在钢水精炼领域已逐渐替代蒸气真空泵系统,合理、高效的除尘系统是保证机械真空泵系统正常运行的必要措施。本文介绍了机械真空泵除尘系统的设计和工作原理,以及除尘系统常见的问题和产生原因。结合相关工程实践经验,对除尘系统进行了优化改进,包括双级气体冷却系统、自动脉冲吹扫系统、自动卸灰系统、废气监控与报警系统。优化改进后的除尘系统在某新建电炉炼钢厂的RH真空精炼炉工程上已连续运行一年多,有效保护了机械真空泵的正常运行,满足了RH真空精炼炉的生产工艺要求。

橡胶带式真空过滤机在尾矿脱水工艺中的应用与改进

针对蓬莱矿业河西选厂尾矿库库容量无法满足后期生产要求的问题,提出了包括“旋流器+振动筛+浓密机+压滤机”脱水工艺、“旋流器+振动筛+卧螺离心机”脱水工艺、橡胶带式真空过滤机无浓缩脱水工艺在内的三个尾矿高效脱水工艺方案,通过对场地及土建、脱水设备、滤饼含水率、滤液含固率、溢流处理、投资概算、运行费用等方面进行对比和选优,最终选定橡胶带式真空过滤机无浓缩尾矿脱水工艺为最优。应用效果表明,该工艺降低了尾矿脱水工艺技术难度、减少了建设规模、节省了投资费用与运行费用,使尾矿脱水变得简单易行、经济可靠,很好地解决了尾矿库加高扩容问题。

橡胶带式真空过滤机故障分析及应用

分析了橡胶带式真空过滤机从动滚筒难移动、托辊和轴承损坏等故障原因,采取了尾部导向滑槽、托辊轴承端面密封、托辊表面衬PP材质、滑台车削、托辊错位安装、接近开关改为光电开关、增加水质过滤器等改造或修复措施,使托辊轴承、耐磨滑槽和耐磨带延长寿命0.5倍以上,降低材料消耗≥10万元/a。

矾山磷矿磷精矿浆脱水工艺技术优化

河北省矾山磷矿是1983年化工部化工矿山规划设计院设计的国家重点大型磷矿,1996年建成投产,自2008年开始不断进行设备更新和生产工艺优化。磷精矿脱水段用陶瓷过滤机取代真空过滤机,取消了热风炉干燥设备系统,进一步优化陶瓷过滤机反冲运行系统和陶瓷滤板清洗作业操作新技术,使得陶瓷过滤机的运行效率明显提高,大幅度地降低了磷精矿脱水生产的运行成本。实现每年可节约脱水段生产费用约639万元,每年减少不合格磷精矿产品产出7500t而增加的经济效益约375万元。取消燃煤进行烘干,极大降低碳排放及粉尘排放,产生了良好的环境效益和社会效益。