钛白生产中硅藻土助滤剂的正交试验

在硫酸法生产钛白粉的工艺中,需要对钛铁矿酸解后初步沉降产生的黑液进行精滤.传统的精滤助滤剂是木粉.由于制备木粉需大量木材,因而使用木粉助滤剂面临生态环境的压力.采用一种新型助滤剂硅藻土,并利用正交试验设计法确定了使用硅藻土助滤剂的精滤过程的最佳工艺参数(硅藻土用量、黑液预热温度和搅拌时间等).相关的工业试验证明,硅藻土替代等量木粉可使黑液过滤量增加80.6%,而成本仅为木粉的64.5%.     

有机纤维素助滤二氧化钛研究

详细探讨了木质有机纤维素用量对二氧化钛滤饼穿滤损失、过滤能力、滤饼强度、铁含量、含湿量的影响，及其煅烧残留量对钛白粉质量的影响。进而阐述了钛白粉生产过程中用木质有机纤维素作为二氧化钛水合物助滤剂的使用方法和助滤效果。结果表明，选用木质有机纤维素作为水合二氧化钛助滤剂，不仅可以增加滤饼强度．减少滤饼垮塌．还可以提高过滤、洗涤能力，降低滤饼中的残留杂质，特别是对钛自粉生产过程中有害铁离子的去除非常有利。比较台理的使用方法是先对滤布进行预涂处理，再用主体掺浆加料法。其合理用量为，预涂层厚度1～2mm．主体加料量为过滤浆料中二氧化钛于基质量的0.2％～0．5％。     

硅藻土助滤剂在硫酸法钛白生产中的应用

叙述了钛液助滤剂的作用及其要求,并介绍了硅藻土助滤剂在硫酸法钛白生产中的应用。     

精细过滤及硅藻土助滤剂的应用

采用硅藻土助滤剂应用于工业精细过滤,可提高过滤质量和过滤能力,并能扩大过滤机的适用范围。介绍了应用硅藻土助滤剂过滤操作的三种方式以及硅藻土过滤机的类型及特点和硅藻土的过滤性能。     

硅藻土助滤剂的应用

介绍了国外硅藻土助滤剂在过滤水中的应用和近年国内研究工作概况，有关资料表明，硅藻土过滤技术可用于饮用水、工业用水、游泳池水过滤以及工业废水、生活污水处理后的过滤净化，过滤设备简单、占地少、易操作、费用低、效果好，主要滤除细微悬浮物、胶体物质、细菌病毒等，滤水清亮透明。     

PAAA共聚物对细粒煤助滤实验研究

利用实验室合成的共聚物PAAA（由丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸、丙烯酸辛基酚聚氧乙烯醚酯共聚产物）助滤剂对细粒煤助滤、脱水进行了实验研究,探讨了助滤剂用量、过滤时间、真空度、pH值等因素对脱水效果的影响。该新型助滤剂能够明显地提高细粒煤助滤、脱水的技术指标。     

PAAA共聚物对细粒煤助滤实验研究

利用实验室合成的共聚物PAAA(由丙烯酰胺、2-丙烯酰胺-2-甲基丙磺酸、丙烯酸辛基酚聚氧乙烯醚酯共聚产物)助滤剂对细粒煤助滤、脱水进行了实验研究,探讨了助滤剂用量、过滤时间、真空度、pH值等因素对脱水效果的影响.该新型助滤剂能够明显地提高细粒煤助滤、脱水的技术指标.     

用煤灰作助滤剂测煤沥青的喹啉不溶分的研究

旨在探索一种用煤灰作助滤剂的方法，从理论上分析了助滤原理，并用大量试验来证实煤灰作助滤剂的可行性。结果表明：用煤灰作助滤剂，测定煤沥青的喹啉不溶分的过程中，可显著提高过滤速度，所得数据准确度高。     

表面活性剂型助滤剂助滤行为的研究

对表面活性剂型助滤剂在过滤过程中的作用进行了系统地动态研究，总结了表面活剂型助滤剂在过滤过程中的行为规律。表面活性剂强化物料过滤过程的贡献主要表现在滤饼脱水阶段，且脱水时间越长、助滤效果越好。表面活性剂降水效果受到一定的过滤条件和物料性质的约束。对同种物料，粒度性质不同、过滤条件不一样（如过滤压差和脱水时间不同），表面活性剂所表现的助滤效果差别颇大。     

硅藻土的节能熔烧

硅藻土助滤剂被广泛地用于各工业部门。它通常被分为三种不同的类型,即天然硅藻土、煅烧硅藻土和熔剂煅烧硅藻土。天然硅藻土是将采出的硅藻土原矿干燥、破碎、气流分级或筛分成具有一定粒度的硅藻土颗粒。煅烧级硅藻土是把原矿干燥、破碎、然后在980℃至1315℃的温度下煅烧,使硅藻土颗粒产生一定程度的收缩、硬化并聚集成较大的团粒。熔剂煅烧即是在煅烧之前在硅藻土粉中添加某种助熔剂,如碳酸钠,以改善硅藻土的过滤性质。 为了得到满意的煅烧级硅藻土助滤剂,     

Preozonation To Improve And Optimize Diatomaceous Earth Filtration

The benefits of preozonation before diatomaceous earth filtration have been demonstrated in a City of New York research program to develop design criteria for treatment of its 300 mgd Croton water supply. In the treatment of a supply where paniculate matter is predominantly of organic origin, preozonation provides two outstanding advantages that are not possible in diatomaceous earth filtration alone.     

VB12发酵液过滤特性研究及分离优化

对VB12发酵液进行絮凝预处理,由正交实验确定影响絮凝的主要因素,结果表明,最佳絮凝条件:絮凝剂为聚合氯化铝、加入体积分数7%、pH值6、搅拌速度140 r/min、搅拌时间45 s。通过加压过滤实验,得到絮凝后滤饼的过滤特性;在此基础上,加入硅藻土助滤剂以探讨对滤饼结构和过滤速率的影响,并考察滤饼的比阻值及可压缩性。实验表明:絮凝预处理后的滤饼为高可压缩滤饼,加入硅藻土后滤饼的比阻值降低,可压缩性系数减小到0.387,过滤速率提高30%。     

Preparation of Hydrothermally Solidified Mesoporous Materials from Diatomaceous Earth for Moisture Control Application

Mesoporous materials were prepared by hydrothermal treatment of a powder compact consisting of natural or calcined diatomaceous earth and slaked lime. Tobermorite formed after the hydrothermal process, leading to strength improvement. The structure tangled with each tobermorite particle, causing the formation of mesopores. The bending strength and mesopore volume of the hydrothermally solidified materials derived from calcined diatomaceous earth was much higher than those derived from natural diatomaceous earth. Impurities in the natural diatomaceous earth suppressed the crystallization and growth of tobermorite, which plays an important role in strength improvement and mesopore formation. Water vapor adsorption–desorption isotherms showed that the amount of adsorbed moisture on the two kinds of hydrothermally solidified materials was almost the same.     

硅藻土-木桨纤维为助滤剂强化过滤过程的研究(英文)

In this paper, a study to enhance the filtration for solid/liquid materials difficult to be filtered, such as highly viscous, highly compactible or gel like materials, is presented. Filter aids diatomaceous earth and wood pulp cellulose are used to enhance the filtration by improving filter cake structure and properties in the filtration of a biological health product and a highly viscous chemical fiber polymer melt product. The property of solid/liquid systems, filtration at different flow rates, specific cake resistance, cake wetness, filtration rate, filtrate turbidity for filter aid selection and evaluation, and operation optimization are investigated. The results are successfully applied to industrial process, and can be used as a reference for similar filtration applications.     

金红石型纳米二氧化钛表面包覆的若干研究

对金红石型纳米TiO2进行表面处理是钛白粉工业化生产中必不可少的关键步骤,处理的方法和包覆的程度直接影响到产品的应用范围。介绍了金红石型纳米TiO2表面包覆的机理、包覆的方式以及对包覆效果进行表征的一些常用方法。     

The pretreatment of seawater RO feed using the UVOX (UV/oxidant) process

The UVOX process, which is essentially the retention of chlorinated (or conceivably ozonated) seawater for a period of about 3 days in open ponds, has been developed and proved to be effective in improving the treatability of nutrientrich recalcitrant seawater, to the extent that simple sand filtration and/or diatomaceous earth filtration will yield a feedwater, for RO desalination, with a plugging index of less than 45 per cent. The process eliminated the need for chemical coagulation and relatively expensive clarification systems.     

ZetaProbe电位仪在金红石钛白粉后处理生产中的应用

通过对ZetaProbe电位仪在金红石后处理生产中应用的介绍，描述了如何通过对金红石TiO2粉体表面电性质的控制来达到更好地粉体分散和无机包膜，对生产具有很好的指导意义。     

提高相变材料十四酸导热性能的研究

利用时间—温度曲线法对13组十四酸-硅藻土体系的导热系数进行了测定,得到了十四酸添加不同量硅藻土的导热系数变化关系曲线,硅藻土的添加量应≤15%。通过添加硅藻土,相变材料十四酸的热传导热性能有了较大的改善。     

TiO_2配制系统的改造和TiO_2配制方法的改进

聚酯生产线原有的TiO_2系统采用两次球磨、一次离心分离工艺,配制效果较好,但是配制能力有限,无法满足全消光聚酯切片生产的需要。通过提高溶液浓度、改变原有工艺管线、改变配制流程等,使配制TiO_2能力由原来的2.4 t/d提高到6.6 t/d,所配制的TiO_2溶液质量能满足生产需要。通过改变TiO_2添加系统,由单泵运行变为双泵运行,添加能力大幅提升,满足了生产全消光聚酯切片时对TiO_2添加量的需要。经过诸多改进后该聚酯生产线可生产附加值高的全消光聚酯切片。     

Regeneration of oils used for deep frying: A comparison of active filter aids

A number of products are promoted for the purpose of regenerating used frying oils. These materials are referred to as “active” filter aids. They are purported to adsorb polar compounds, which are the products of oil degradation, and to retain them for removal by filtration. To evaluate some of these materials, portions of a used oil were treated with each of several “active” filter aids and filtered in a commercial-type recirculating oil filter. The triglycerides and any adsorbed compounds were extracted from the filter cake with a series of increasingly polar organic solvents. The composition of each of the filter cakes was quantitatively determined. The materials tested in this study were diatomaceous earth, acid-activated bleaching earth, activated aluminas, silica, carbon and synthetic magnesium silicate. Significant differences in the adsorbent characteristics of the materials were found. Adsorption of polar oil degradation compounds ranged from 2 mg of polar compounds per gram of diatomaceous earth to about 200 mg/g magnesium silicate.