锌精矿湿法制氧化锌的研究

用工业硫酸浸取焙烧脱硫后的锌精矿,经过一系列的除杂步骤,湿法制取氧化锌,所得产品氧化锌的纯度达99.71％,各项技术指标均符合产品标准,其中元素锌的总回收率达到87％以上。     

湿法冶锌新浸取技术及其进展

本文概述了锌精矿湿法冶炼的多种新浸取工艺，进行相关综合评述，并介绍国内外一些湿法冶锌工艺发展新趋势。     

全湿法闪锌矿制锌品工艺研究

本文介绍了闪锌矿不经焙烧,直接用矿湿法制锌产品工艺,回收硫磺及其有价值元素,浸出剂再生不用氯气,而用氧气在催化剂作用下再生循环使用,硫磺萃取不同ＣＳ２。崦用不燃不爆,低毒有机氯萃取,不需蒸馏回收溶剂,这是本工艺的另外二个特点,该工艺有较好的经济,环保效益。     

三氯化铁溶液浸取锌精矿制锌白

提出了湿法由锌精矿制取锌白的工艺过程,着重研究了三氯化铁溶液浸取锌精矿和TBP萃取分离铁锌的影响因素,得出了各有关工艺过程的优化条件。     

湿法制备超细锰锌铁氧体前驱粉工艺条件研究

以软锰矿，闪锌矿，硫铁矿为原料，经酸浸取对浸出液进行除杂，精制，采用碳铵共沉淀法制取锰锌铁氧体微粉，对工艺条件进行了研究，该工艺具有生产成本低，产品回收率高，节省能源等优点。     

湿法炼锌中除钴工艺现状研究与发展

对湿法炼锌硫酸锌溶液净化除钴工艺作了简要介绍,分别介绍了目前工业上应用的两大类方法:一类为加有机试剂(黄药、β-萘酚)除钴;另一类为锌粉置换除钴。并对新的除钴方法进行了介绍。分析比较了各种方法的优缺点。     

湿法制备红色氧化汞工艺的研究

以氯化汞为原料，氯化钠作助剂，湿法制备红色氧化汞。试验研究了工艺操作条件对产品质量的影响，获得了最佳工艺技术条件参数，并在工业性生产中验证了试验结果。所得红色氧化汞产品，其化学指达到了ＨＧ３－１０６９－７７中的分析纯级质量要求，物理指标装填密度芤达到了供制造标准汞电池用的高质量要求。     

氟化钐的湿法制备方法

本文研究了湿法制备氟化钐的两种工艺过程－传统工艺和炭酸氢铵转型新工艺。分析比较了两种工艺的ＨＦ用量,反应温度和稀土浓度对稀土收率和沉淀速率的影响,初步探讨了其沉淀机理。用Ｘ射线衍射,差热－热重及透射电镜分析方法对两种方法制备的氟化钐产品进行了组成,形貌和粒径等测定。     

湿法冶金中锌的萃取工艺研究进展

本文主要综述了国内外近些年对锌萃取的大量基础性研究,对不同种类的锌萃取剂进行了简要介绍。介绍了近些年热点研究的新的萃取工艺和萃取技术。并对工业上不同的锌的原料的萃取过程和方法进行介绍了相关介绍。对锌萃取工艺的工业应用前景进行了评述。     

聚甲醛纺丝工艺进展及产品应用研究

聚甲醛纤维具有耐磨、耐碱、耐溶剂、耐海水侵蚀,以及尺寸稳定性好等优点,所以产品应用领域逐渐被开发。聚甲醛纺丝工艺有超倍拉伸法、溶液纺丝法、静电纺丝法和熔融纺丝法,其中熔融纺丝法工艺简单,成本低,效率高,是聚甲醛纤维工业化最经济、最理想的方法。随着聚甲醛熔融纺丝工业化的发展,聚甲醛纤维产品的应用领域逐渐被拓宽,主要应用于绳索、土工布、帘布、增强建材、毛刷及其他。     

甲胺及下游产品二甲基甲酰胺概述和发展前景探讨

本文从技术的角度介绍甲胺产品基本状况，特别对上海石油化工研究院甲胺工艺技术给予关注，并且在发展方面提出需要注意事项。     

Oxidation Of Iron And Manganese By Ozone

The oxidation of iron and manganese by ozone was studied in the laboratory. Model waters both with and without organic matter were used. Results showed iron to be very rapidly oxidized to an insoluble form in the absence of organic matter. However, in the presence of organic matter the iron was protected from oxidation by ozone and precipitation. The degree to which this occurred depended on the nature of the organic matter and the chemical environment at the time of mixing the iron stock and the dissolved organic matter.

Experiments with manganese allowed the determination of second order rate constants for the reaction of ozone with manganese at various pH values. The oxidation of manganese in the presence of organic matter occurred in competition with oxidation of the organic matter. As a result, high ozone doses were required to achieve the same degree of removal of manganese. An increase in bicarbonate alkalinity from 50 mg/L to 200 mg/L did not result in an acceleration of the manganese oxidation in the absence of organic matter. However, in the presence of organic matter, higher levels of bicarbonate created conditions that resulted in more complete oxidation of the manganese following total consumption of the dosed ozone.     

热熔胶的现状与发展

综述近年来热熔胶粘剂在美、欧、日的市场发展，热熔胶的品种与形状，反应型热熔胶，压敏型热熔胶，做热熔基料的新材料，以及涂布设备等。说明热熔胶的现状与发展。     

三聚氰胺的生产与现状

介绍了三聚氰胺的各种生产方法、国内外的生产现状及消费情况。     

纤维素在LiCl/DMAc中的GPC研究的现状及进展

综述了以 LiCl/DMAc 为流动相,用 GPC 分析纤维素分子量分布的样品制备、校准及色谱分析条件,并就其应用及存在的问题进行了总结。     

压敏电阻复合粉体用ZnO的制备方法简介

本文综述了工业级氧化锌精制为电子陶瓷用氧化锌的方法及共用化学合成制备氧化锌压敏电阻多元复合粉体的研究进展。     

汽车工业用粘接材料的现状与展望

本文按照汽车制造工序介绍国外汽车工业折边用胶粘剂、点焊胶接用胶粘剂、车身密封胶、车身底涂料、窗玻璃用单组份湿气固化型聚氨酯胶粘剂以及纤维增强树脂用结构胶粘剂等主要胶种的最新技术发展动向。讨论了我国汽车工业用胶粘剂的现状和差距，提出几点建议。     

煅烧硬石膏/PVC复合材料力学和流变性能研究

通过煅烧硬石膏后超微粉碎,以熔融共混法制备了煅烧硬石膏/PVC复合材料,并测定其粒度、力学性能和流变性能。结果表明:煅烧到一定温度后硬石膏晶粒度非常集中。包覆改性能使超细煅烧硬石膏与复合材料有更好的相容性,使塑化时间、平衡扭矩和塑化段能耗降低明显,而用硅烷偶联剂包覆改性的复合材料力学和流变性能最好。     

Use Of Static Mixer For Oxidation And Disinfection By Ozone

Ozone is used in drinking water treatment as a biocide, as an oxidant and as a pretreatment in order to improve the performance of subsequent processes. Increasing concern over the quality of drinking water has led to a number of new stringent regulations in the control of chemical and microbiological contaminants. Disinfection deals with the concept of “CT”, which is the need to maintain a certain minimum concentration for a given time. Under ideal laboratory conditions, it is 0.4 mg O₃/L for 4 min. In practice, since the method for the CT determination has not been finalized by the EPA, “T” can be the minimum detention time of 90% of total flow, and “C” can be a measured ozone residual at the outlet of cells of the contactor. New standards for micropollutants in drinking water imply an optimization of the ozonation step, by improving the ozone transfer from gas to water, and the control of the detention time as well as ozone residual within the contactor.

All these considerations have led us to use static mixers to transfer ozone into water. This process enables us to control the ozone concentration in water and detention time. It is a very simple system, with very low maintenance requirements due to the lack of moving parts. Civil engineering is minimized. A pilot scale study is presented here. It took place at the Méry-sur-Oise water treatment plant, on a pilot plant working at 8-12 m³/h. It is composed of a static mixer for the transfer of ozone from gas to liquid, linked to an air lift to separate gas from liquid, providing ozonated water.

The optimization of transfer was achieved by studying the impact of water flow, gas flow and ozone concentration in the gas. It is possible to reach 90% of transfer in less than 15 s. Headloss (ΔP) across the mixer is a function of gas and water flows and remains economically very acceptable as 0.15 bar for 12 m³/h.

Atrazine removal was studied using a static mixer, an air lift and a contact pipe 80-m long, providing an optimum contact time phase, working as a plug flow reactor. Ozone and H₂O₂/O₃ treatments were compared. The maximum reduction of atrazine concentrations (e.g., for an infinite contact time) is a function of the amount of transferred ozone, but H₂O₂ influences the kinetics of the reaction. In the presence of H₂O₂ with a ratio of H₂O₂ to O₃ of 0.4 w/w, maximum elimination is reached in 2 min 30 s.

The effect of such treatments on environmental bacteria also was followed. A counting of total germs at 20°C showed a decrease of 1- to 3-logs 10 after 1 min 30 s of contact time for about 2 mg/L of transferred ozone. No significant difference between treatments with or without H₂O₂ was shown. The same conclusions were obtained from heterotrophic plate counts (37°C) and epifluorescence countings.