辊压研磨基本参数分析

正辊压机和立式辊磨都是辊压研磨,其特点是用压力使两个辊面间松散堆积的物料相互作用而得以破碎或研磨。加压的磨辊要能自由移动,才能完全压实充满磨辊间隙的物料。辊压研磨与辊式破碎机不同,后者的辊子固定且两辊之间有一定辊隙,喂入的松散原料传递的力是不确定的,由于辊隙始终敞开,很多未被辊压的细料会穿过。辊式破碎机破碎的物料颗粒比辊隙大,而辊压研磨可研磨规格在一定范围内的物料,研磨后的物料颗粒远比辊隙小。     

减少水泥粉磨预水化

近年来,水泥辊磨因高产量、低耗能、厂房投资低、生产时易改换水泥品种等优点而逐步扩大使用,其数量已超过球磨。然而辊磨也存在一些技术难点,若入磨物料颗粒小(约50%,<4mm),需较高的压力来进行粉磨,生产高比表面积的水泥颗粒时,易产生振动。为减缓振动,在水泥粉磨过程中需向物料喷水,使之成团状。但喷水会使水泥预水化,一定程度上降低了水泥强度。     

稳定RP140-110辊压机运行是联合粉磨的关键

针对该粉磨站由RP140—110辊压机、φ4．2×13m闭路球磨机组成的联合粉磨系统产量低的问题,主要从入磨物料的性质和辊压机的操作参数以及设备性能三个方面进行分析并采取相应措施,使辊压机的运转率大于85％,系统产量提高到了设计能力155t／h,综合电耗接近了设计指标。     

辊压机硬面修复技术介绍

1辊压机的使用和辊面损伤的一般概况
　　辊压机具有能耗低、效率高且钢材消耗低及噪声小等功能，与球磨机组成的粉磨系统，可使球磨机系统产量提高30%~50%。因经辊压机挤压后的物料料饼中，0.08 mm细料占20%~35%，小于2 mm占65%~85%；而且小颗粒的内部结构因受挤压而充满微小裂纹，易磨性大为改善。     

辊压机在粉磨工艺中的应用

１．前言辊压机也称辊压磨是８０年代中期由原联邦德国首先开发问世的粉磨节能设备,使用这种设备与粉磨系统的球磨机配套可以获得大幅度降低能耗和提高磨机产量的效果。辊压机作为一种新型的粉磨设备在我国许多水泥厂已得到广泛应用,由于辊压机的工作原理与现有的粉磨设备不同,不是靠冲击力、摩擦力等对物料实施破碎,而是采用纯压力破碎,也称为“粒间破碎”。这一原理的改变使辊压机应用于破碎物料时比传统粉磨设备具有较高的节能、增产意义,因而也具有较高的市场竞争力。同时国内外对辊压机的研究也日益完善,而辊压机的使用也使我们…     

生料辊压机终粉磨系统提产改造

针对3#生料辊压机终粉磨系统故障频繁,辊压机运行状况不稳定,辊缝波动幅度大,导致台时产量低、能耗高等问题,通过将该系统恒压控制方式改为自适应恒辊缝控制方式,并改进生料循环提升机出料口至辊压机称重仓溜子,使3#辊压机台时产量由185.6 t/h提高至222.96 t/h,电耗由14.53 kWh/t降至12.74 kWh/t,达到了预期改造效果。     

水泥磨辊压机柱钉辊使用分析

通过复合辊与柱钉辊面的各种性能综合对比,反映出柱钉辊对原物料适应性强,有利于电耗、台产的稳定,指标略有提升,水泥质量稳定,辊面磨损小,维护费用低,年均5万元左右,建议在水泥磨辊压机上推广使用柱钉辊。     

新颖粉碎方式破解常温下非金属矿粉体材料超细化难题 浙江丰利超细辊压磨成非矿深加工设备首选

超微粉碎技术在国民经济的各个领域起着越来越重要的作用,特别是非金属矿的利用取决于对其进行深加工的程度,其中有效的超细粉碎是进行各项深加工的前提和保证。而超细辊压磨则是其最重要的深加工技术之一。因为多数非金属物料在普通机械冲击力作用下进行的粉碎很难达到1000目（13微米）以上。对于需要达到1000目（13微米）以上的非金属物料最佳粉碎方式是辊压研磨。为此,各国科技工作者在这方面开展了大量的研究,希望寻找出能在常温下使这类材料超细化的较理想的方法。在这方面研究卓有成效的是前苏联、美国、英国和日本。德国在这方面的研究也很系统全面,有一种自转加公转的粉碎方式可在常温下将非金属矿粉碎到1000目（13微米）以上,而且产量高。     

新型立磨磨辊门密封装置*

正0前言随着水泥物料粉磨的发展,立磨以其占地小、电耗低、噪音小、产量高、等优点成为物料粉磨系统中的重要设备,主要用于粉磨水泥原料、水泥熟料、矿渣、煤粉等。而立磨磨辊门密封的严密程度会影响立式辊磨机的台时产量。磨机工作时摇臂实时摆动,要与静止的磨辊门间形成紧密接触的有效密封更加困难。为此,设计了一种新型的立磨磨辊门密封装置,该装置以获得国家实用新型专利。     

浅析水泥厂辊压机辊面寿命的保障措施

要延长水泥厂辊压机辊面寿命,不仅要选购到适合本厂物料粉碎工况的挤压辊及焊丝,还要严格执行设备维护规则,重视辊面的小修小补;不仅要严格控制辊面工作的环境温度和物料温度,还要严格执行辊压机稳定工作的条件,确保料压、物料粒度、挤压粉碎力适宜;不仅要严禁硬质金属进入辊压机,还要减少硬质物料进入辊压机.     

Cyanuric acid–epichlorohydrin prepolymers

In this study, we investigated the reaction of cyanuric acid and epichlorohydrin (ECH). SnCl₄ was used as a catalyst. Several reaction conditions were tested, and the products were analyzed by means of Fourier transform infrared and ¹H‐NMR spectroscopy, hydroxyl group content, molar mass, elemental and thermal analysis, viscosity, and density. ECH reacted with the amine groups of the cyanuric acid ring to form lateral chains that contained chloroalkyl and hydroxyl end groups. Full substitution of the amine groups was observed in all of the synthesized products. The solvent used in the synthesis was found to be very important for the structure of the final prepolymers. When N,N‐dimethylformamide was used, relatively low‐molar‐mass prepolymers of cyanuric acid and ECH were obtained. When solvents with low dielectric constants were used, no reaction with cyanuric acid was observed. The prepared prepolymers were thermally stable up to 160°C. At this temperature, degradation started via the lateral chains. The viscosity of the products decreased as the ECH–cyanuric acid ratio increased, whereas the density remained basically constant. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3684–3691, 2006     

氰尿酸清洁生产的新工艺

氰尿酸是高效除藻剂二氯异氰尿酸钠(钾)和三氯异氰尿酸的主要原料,尿素热解法生产氰尿酸的传统工艺会产生大量的含氨气体和大量不同浓度的酸性废水。多数生产企业分别采取了副产氨水和用石灰中和酸性废水(再排放)的方法,又会导致二次污染。本文从清洁生产技术入手对该生产工艺进行了零排放改造,并综合分析和优化各工艺参数,达到了污染治理的设计目标,实现了副产品的回收和综合利用,获得治污、增效的双重目的。     

动态水热法合成超轻硬硅钙石的研究

硬硅钙石质隔热材料具有体积密度小,隔热效果好的优点,是优良的保温隔热材料。本研究采用动态水热合成工艺制备硬硅酸钙粒子,研究硅质原料粒径、水固比、添加剂等因素对水热合成产物成份和晶体形貌的影响。在此基础上对制备工艺进行优化,制备出具有中空结构的超轻硬硅钙石二次球团粒子。     

三嗪系成炭剂的研究进展

三嗪系成炭剂依据分子构型可分为小分子、线形大分子和超支化大分子,分别介绍了其合成原料、合成工艺和阻燃效果,重点对采用三聚氯氰、三聚氰胺、异氰尿酸及其衍生物等原料制备的成炭剂进行了评述,分析了不同品种成炭剂的优缺点,并对三嗪系阻燃剂的发展方向进行了展望。     

氧化锆料浆性能对其喷雾造粒粉料性质的影响

本文研究了料浆含固量和粘度对其喷雾造粒粉料性质影响。结果表明：氧化锆料浆含固量是喷雾造粒（ＳＤ．）粉料填充密度的主要控制因素，高含固量料浆能得到高填充密度喷雾造粒粉料，且其颗粒显微结构相对致密；随着ＺｒＯ２料浆含固量、粘度增加，喷雾造粒粉料平均粒径增大，粗颗粒含量增多，细颗粒含量减少。     

Vibratory densification of thermal insulation corundum products

Conclusions During vibratory densification, the bulk density and the angle of repose of the corundum bodies based on hollow granules and a porous filler depend on the type of the filler used and the size of its grains. The relative settling and the relative density of the bodies obtained after densification are related to their bulk density and the angle of repose.We established the dependence of the shrinkage during firing, the apparent density, and the strength of the fired products on the bulk density, the degree of settling, and the relative density of the specimens after vibratory densification. At a given density, the products based on the corundum granules exhibit higher strength.We developed large-sized corundum products of complex shape for thermal insulation at 1800°C under reducing conditions.Translated from Ogneupory, No. 4, pp. 28–32, April, 1986.     

固相和液相法合成氰尿酸的对比研究

对固相法和液相法合成氰尿酸的方法进行比较,采用比色法测定缩二脲含量,用甲醛测定尿素、缩二脲的总氮量,由缩二脲的含量、总氮量推算出尿素的含量及产品的纯度,从而说明液相法的优势。以不同溶剂加热脱氢生产氰尿酸的收率和纯度做了对比实验,并通过选择确定硅油210 50是一种新型的理想的和廉价的溶剂。     

2，4，6-三（4-羧基苯氨基）-1，3，5-三嗪的合成与表征

均三嗪分子具有特殊的芳香环骨架,其中的三个碳原子可直接连接烃基或通过杂原子连接烃基构成各种星型结构的三取代均三嗪分子,它们因具有良好的物理和化学性能被广泛应用于功能材料、医药等领域.本文以三聚氯氰、对羟基苯甲酸为主要原料合成2,4,6-三（4-羧基苯氨基）-1,3,5-三嗪,研究反应阶段反应物料比、时间、温度、缚酸剂、溶剂等因素对合成的影响,确定了2,4,6-三（4-羧基苯氨基）-1,3,5-三嗪的最佳合成工艺条件.通过试验研究,优化出最佳合成工艺条件为：n（三聚氯氰）：n（对羟基苯甲酸）=1：4,反应温度为60℃,反应时间为2.5h,溶剂为丙酮,缚酸剂为氢氧化钠.该方法得到的产品产率高达75.63％.     

Influence of Granule Character on Strength and Weibull Modulus of Sintered Alumina

Alumina specimens were prepared by compacting well-characterized spray-dried alumina granules of excellent deformability, followed by sintering. The strength and Weibull modulus were measured and microstructure was evaluated for specimens prepared from granules with different density and morphology. Compacts of spheroidal granules with lower density and lower granule strength sintered to 98% relative density and had fewer microstructural defects than compacts prepared from spheroidal or hollow granules of higher density. Flexural strength of sintered material was found to depend on initial granule size but not density or morphology of the granules. Weibull moduli of 18–20 were independent of particular granule characteristics.     

Pore evolution and compaction behaviour of spray-dried bodies for porcelain stoneware slabs

The compaction behavior of spray-dried powders has turned into concern in porcelain stoneware manufacturing due to the increasing diffusion of large slabs. It is necessary to fill a knowledge gap between the compaction behavior with conventional presses and novel technologies. For this purpose, eighteen industrially-manufactured spray dried bodies were characterized for specific properties connected to the compaction behavior (curves of bulk density, intergranular and intragranular porosity in function of applied load, apparent yield strength). In addition, the firing behavior was investigated in order to reveal any effect of dry bulk density on firing shrinkage and bulk density of fired samples. Powder compressibility is within 50% and 55% (Carr index) and is primarily controlled by moisture. Two regimes are found: low pressure (fast density increasing by granule cave in and closure of intergranular porosity) and high pressure (slow density gain by downsizing microporosity). A peculiar mechanism is unveiled: granules squeeze in the low-P regime and further densification is achieved through microfracture around individual agglomerate. A phenomenological model is illustrated for the compaction of spray-dried powders. In conclusion, the performance of spray dried bodies during compaction is crucial to control the uniformity, in terms of porosity and bulk density, which has important repercussions on the properties of final slabs, especially differential shrinkages and deformation during firing due to density gradients.