煅烧改性凹凸棒土处理含磷废水的研究

凹凸棒土经预处理后在不同温度下进行煅烧改性,研究其对自制含磷废水中磷去除率的影响。结果发现,凹凸棒土对含磷废水的脱除以吸附为主,与其比表面积存在相关性,随比表面积增大其对磷的去除率增强。     

吸附干燥剂4A分子筛制备研究

在７８０～８２０℃下可将耒阳高岭土锻烧成偏高岭土。后者在水热条件下同碱反应生成４Ａ分子筛。研究结果表明,不同的水热反应条件对产物的吸附能力有影响。     

300MN模锻水压机操纵系统复杂网络控制实现

基于PROFIBUS的300MN模锻水压机操纵系统控制网络有分布式I/O和智能DP从站两种实现方式;与同步系统通讯有全局数据包方式和非组态两种方式.比较了不同实现方式的优劣,根据现场情况,合理地选用智能DP从站和全局数据包方式,实践表明,在满足通信实时快速性要求的同时,所配置系统网络运行良好,并且显著降低成本.     

Reduction roasting of high iron bearing zinc calcine for recovery of zinc and iron

High iron bearing zinc sulphide ore is an important resource for zinc, and the reserve is very great in the world. It is very difficult to effectively obtain zinc and iron from the source by traditional technology. In this study, a novel method was proposed for recovery of zinc and iron from high iron bearing zinc calcine, and the key procedure, reduction roasting, was investigated. The effects of CO concentration, CO₂ concentration, temperature and time on reduction roasting were studied respectively. The experimental results show that the content of soluble zinc and magnetic susceptibility reached 91·15% and 4·1×10^?4 m³ kg^?1 under the optimum conditions respectively. About 90%Zn and 9·5%Fe were dissolved from the reduction roasted zinc calcine by low acid leaching, and simultaneously, 84·3%Fe was recycled to the iron concentrate containing iron of 53·2% from zinc leaching residue by low intensity magnetic separation.

Le minerai de sulfure de zinc à haute teneur en fer est une ressource importante du zinc et il en existe une grande quantité dans le monde. Il est très difficile d’obtenir efficacement le zinc et le fer de cette source par la technologie traditionnelle. Dans cette étude, on propose une nouvelle méthode pour la récupération du zinc et du fer à partir de produit calciné de zinc à haute teneur en fer, et on examine la procédure clef, le grillage réducteur. On a étudié respectivement les effets de la concentration de CO, de la concentration de CO₂, de la température et de la durée sur le grillage réducteur. Les résultats expérimentaux montrent que la teneur en zinc soluble et la susceptibilité magnétique atteignaient respectivement 91·15% et 4·1×10^?4 m³ kg^?1 en conditions optimales. Environ 90% du Zn et 9·5% du Fe étaient dissous à partir du produit calciné de zinc de grillage réducteur par lessivage à acide faible, et simultanément, 84·3% du Fe était recyclé en concentré de fer contenant 53·2% de fer à partir du résidu de lessivage du zinc par séparation magnétique à faible intensité.     

模板法制备遗态Al2O3陶瓷的研究

以棉花为模板制备纤维状氧化铝陶瓷,并采用X射线衍射、扫描电镜和比表面积检测法对其微观结构及特征进行了研究。结果表明,制备得到的Al2O3成功地保留了植物纤维的结构。在不同的烧结温度下,得到的Al2O3具有不同的晶型,从低温到高温,获得的晶型从非晶态Al2O3→γ-Al2O3→α-Al2O3,物质稳定性逐渐提高。对比表面积和平均孔径的测定结构表明,不同的制备工艺对氧化铝陶瓷的比表面积和孔径影响很大。     

氧化锌低酸上清经还原再用锌浮渣或氧化锌焙砂沉铟试验研究

针对某厂富集工段铟富集渣渣率大、铟品位低、杂质含量高等问题,以氧化锌低酸上清为铟富集原料,开展了低酸上清直接用锌浮渣沉铟、低酸上清经还原再用锌浮渣和氧化锌焙砂沉铟等试验。结果表明,低酸上清直接用锌浮渣或经还原再用氧化锌焙砂沉铟,所得铟富集渣渣率大、铟品位低且难以过滤,而低酸上清经还原再采用锌浮渣沉铟能较好地解决上述问题,铟富集渣含铟品位在2.5%以上,且杂质含量也低。     

Experimental study on pore distribution characters and convert rate of CaO

During the reaction between calcium sorbents and SO2, calcium sorbents are first calcined and converted into CaO. CaO can be obtained by calcining Ca(OH)2or CaCO3. The porosity of the sorbent is increased because of calcination and is decreased because of sulfurization. In the calcination process H2O or CO2 is escaped from the particles and pores are formed in particles. The reaction or convert rate of CaO is influenced strongly by the pore structure characters. From Ca(OH)2 to CaO the escape velocity of H2O or its mass transfer is one of the key factors influencing the pore forming. During calcination process different healing velocity, different heating time and temperature were suggested. The temperature rising rate and calcining temperature play important role to the pore structure. The convert rates of CaO obtained through different calcining conditions were investigated experimentally. Some interesting results were showed that the calcium utilization of CaO particles is determined not only by the special surface area and total pore volume, but also by pore-size distribution. The main factor influencing the sulfation is the pore diameter distribution at lower sulfation temperature. For higher reaction temperature specific volume is the important reason. But pore-size distribution is strongly influenced by heat flux and temperature in the calcining process.     

从多金属复杂金精矿焙砂中分离提取有价金属

对某多金属复杂金精矿的焙砂进行了"酸浸提取铜锌—盐浸提取铅银—氰化提取金银"工艺试验,获得了各工序的最佳工艺条件。在最佳工艺条件下的综合试验表明,金、银、铜、锌、铁的回收率分别为94.63%、65.12%、90.45%、82.87%、98.92%,有效实现了各有价金属的综合回收。     

ZrO2（Y2O3）超细粉末的性能及其在定氧传感器上的应用

用共沉淀法制备ＺｒＯ２（Ｙ２Ｏ３）超细粉末，在其它工艺相同的条件下，研究了粉末焙烧温度对粉末颗粒度，线性热膨胀和导热性能的影响，证明１２００℃焙烧的粉末制成的熔融金属定氧化传感器测试性能最好。     

分级递阶专家智能控制及其在加氢裂化生产反应过程中的应用

本文以一个年处理量８０万吨重油加氢裂化生产装置集散控制系统的设计与实现为背景，针对反应岗位生产过程的控制要求，提出了基于产生式规则的专家控制器与集散控制系统内部ＰＩＤ调节器相结合的分级递阶专家智能控制方案，通过仿真及开工过程在线运行，证明该方案比一般手动操作具有控制平稳、响应快和精度高的特点。