不纯重晶石还原焙烧过程的探讨

通过对不纯重晶石还原焙烧过程的研究,讨论了反应气氛,反应温度、原料比,特别是原料品质和添加剂对重晶石还原焙烧的影响。     

提高粗钡中硫化钡含量的方法

分析了影响粗钡中硫化钡含量的各因素,阐述了提高钡盐生产中粗钡质量的措施。     

以废料硫化钡制备高浓度硫化钠溶液工艺研究

本文研究了以废料硫化钡为原料采用硫酸钡副盐法制备高浓度硫化钠溶液工艺的过程特性,考察了90℃水中硫化钡的溶解时间、溶解效率、硫酸钠与硫化钡反应时间等因素对硫化钠和硫酸钡产率的影响。用能谱和XRD分析了制备的硫酸钡纯度,结果显示,硫酸钡的纯度大于98%,达工业硫酸钡合格产品;经过浓缩,溶液中硫化钠浓度可达12%～15%。试验结果对产品生产工艺设计与改进具有指导意义。     

硫化钡氧化的动力学研究

前言由重晶石还原焙烧所得的硫化钡,加水溶解后,通入空气进行氧化,可以直接转化为氢氧化钡。这是一条较新的工艺路线。较之国内现有的几种生产方法,可以省掉大量酸、碱,从而大大地降低了产品的成本,并且有利于连续化生产,其副产物也可综合利     

提高重晶石还原率的方法

通过调整重晶石粒度、烧结温度、时间、进炉氧气量、回收尾气中的原料来提高重晶石的还原率。     

硫化钡对含铜镍电镀废水的处理研究

文章以铜镍模拟电镀废水为研究对象,采用硫化钡法对其进行处理,以单因素实验方法考察了各个因素的影响,结果表明处理后铜离子的去除率达到了99.88%,同时镍离子的损失率仅为6.77%,因此该方法有利于资源的合理利用。     

盐酸酸解硫化钡黑灰制备硫化钠和氯化钡工艺的研究

介绍盐酸酸解硫化钡黑灰(重晶石和煤还原煅烧的产物)的工艺,利用氯碱厂的副产盐酸与硫化钡反应制得硫化钠,再用液碱吸收酸解时产生的硫化氢制得氯化钡,还可制得低铁硫化钠。     

高品位重晶石BaSO4的快速测定

稀盐酸除去碳酸钡和硫酸钙，残渣跑氢氟酸除去SiO2，恒重为测定BaSO4＞90％以上，方法简单、快速、结果令人满意。     

硅灰石粉代硫酸钡制醇酸腻子

探讨了用硅灰石粉代替酸钡制造醇酸腻子。实践证明,其效果完全达到国家专业标准,可以大幅度降低成本。     

软锰矿氧化硫化钡制高纯碳酸锰和氢氧化钡工艺研究

软锰矿同硫化钡溶液在较低温度下进行氧化还原反应，当硫化钡含量控制在26-75g／L范围内，软锰矿与硫化钡的物质的量比为2．5-3，反应时间50-60min，软锰矿被硫化钡还原为MnO，其还原率可达93．5％以上；还原后的锰用硫酸浸取，溶液经除杂后，与碳酸铵反应而制成高纯碳酸锰。硫化钡则被氧化为氢氧化钡，经蒸发、结晶而制得入水氢氧化钡，其回收利用率高速95％。     

改性碳纳米管对偏二甲肼的吸附热力学研究

对NaOH改性多壁碳纳米管吸附偏二甲肼的特性进行了研究,在温度为296～313K和浓度为44．51～211．41mg／L的范围内,多壁碳纳米管对偏二甲肼的吸附符合弗仑德利希（Freundlich）和兰缪尔（Langmuir）吸附等温式。不同温度下等温吸附曲线的测定和等量吸附焓的计算表明：多壁碳纳米管对偏二甲肼的吸附是吸热的。对偏二甲肼在多壁碳纳米管上的吸附焓、吉布斯自由能、吸附熵的计算表明,该多壁碳纳米管对偏二甲肼的吸附没有化学键生成,并对吸附行为作了机理性解释。     

Formation, Microstructure, and Properties of Barium Zirconium Sulfide Ceramics

The preparation, microstructure, and properties of BaZrS₃ ceramics are described. The compound was prepared by heating either an equimolar mixture of BaS and ZrS₂ or BaZrO₃ alone in CS₂ gas. The reaction of the BaZrO₃−CS₂ system was extremely rapid, as would be expected in an autocatalytic reaction caused by very strong reduction by CS₂. Well-sintered bodies were obtained only by the BaZrO₃−CS₂ reaction. The time dependence of grain growth was affected considerably when reaction and sintering occurred above 1250° C. Non-uniform grain growth which occurs when an excess of Ba is present can be interpreted in terms of secondary recrystallization resulting from segregation of BaS at the grain boundary during sintering. The BaZrS₃ ceramic was stable in air up to 550°C and was oxidized above that temperature.     

Exaggerated Growth of Hexagonal Barium Titanate under Reducing Sintering Conditions

The influence of reducing sintering conditions on anisotropic grain growth in BaTiO₃ was studied above the BaTiO₃-Ba₆Ti₁₇O₄₀ eutectic temperature. The morphology and structure of exaggeratedly grown grains was examined by X-ray powder diffractometry, scanning electron micros-copy, and high-resolution transmission electron microscopy. The results show that all anomalously grown anisotropic grains were hexagonal BaTiO₃ in the form of platelike crystals with a/c ratios up to 10. The direction of preferential growth of hexagonal grains is crystallographically analogous with that of parallel (111) twins in a cubic phase. Ti³⁺ ions, induced by reducing atmosphere, play an important role in the formation of hexagonal stacking.     

碳纳米管负载氧化钡催化剂的制备及性能

用自行制备的碳纳米管(CNTs)作为载体，研制出一种高活性的催化剂BaO／CNTs，通过对其表面物理结构的分析、SEM图对比以及催化活性的测定，证明小粒径的BaO粒子均匀地分布在碳纳米管表面，对己二酸脱羧反应有良好的催化活性。     

二氧化碳压缩机管路振动分析及减振措施

针对二氧化碳压缩机的管路振动问题,运用振动理论进行分析,从中找出管路振动的主要原因。结合现场实际情况,以现场改动最小为原则,采取了简便而切实可行的改进措施,使管路振动得到有效控制。     

Thermodynamics and Stoichiometry of Reactions between Hydrogen Sulfide and Concentrated Sulfuric Acid

A thermodynamic analysis of the possible reactions between hydrogen sulfide and concentrated sulfuric acid shows that four reactions are feasible. However, only two of these reactions apparently occur in experiments at 1 atm and 0°C to 150°C. Hydrogen sulfide is first oxidized by molecular sulfuric acid, forming SO₂, sulfur and water, and then the H₂S may react with the dissolved product, SO₂, to generate sulfur and water. The stoichiometry of the consecutive reactions and their dependence on acid concentration were determined experimentally using mass balance measurements. The results of this study suggest a possible alternative method for sulfur removal and recovery that has more advantages.     

Use of Succinic Acid to Test the Stability of PTCR Barium Titanate Ceramics under Reducing Conditions

On heating positive temperature coefficient of resistance (PTCR) BaTiO₃ ceramics at 350°C in succinic acid powder, a reducing atmosphere is created as the succinic acid pyrolyzes. Grain boundary resistances, which may give a PTCR effect, are reduced by this treatment, whereas surface layer resistances, which may also give a PTCR effect, are much less affected.