湿法炼锌浸出液中存在多金属组分,如Zn(Ⅱ)和Co(Ⅱ),针对重叠峰分离提出一种基于类Gaussian分布的线性扫描极谱重叠峰分离方法。通过分析线性扫描极谱曲线的特性构造类Gaussian分布作为待分离重叠峰子峰的模型,并利用多分辨率小波分解确定各子峰波峰和波谷位置,基于该模型及确定值对重叠峰及其导数峰进行非线性加权最小二乘(nonlinear weighted least squares,NWLS)拟合,根据重构参数将重叠峰分离为独立的子峰,实现该类重叠峰的分离。该类重叠峰分离的结果表明:多分辨率小波分解的分辨误差小于1%,NWLS拟合的分离精度高于96%,本方法可以有效分离Zn(Ⅱ)和Co(Ⅱ)产生的极谱重叠峰。
Reagents are optimized for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in zinc sulfate solution, which contains an extremely large excess of Zn^(2+). First, the reagents and their doses for the experiment are selected according to the characteristics of the zinc sulfate solution. Then, the reagent doses are optimized by analyzing the influence of reagent dose on the polarographic parameters(i.e. half-wave potential E_(1/2) and limiting diffusion current I_p). Finally, the optimization results are verified by simultaneously determining trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+). The determination results indicate that the optimized reagents exhibit wide linearity, low detection limits, high accuracy and good precision for the simultaneous determination of trace amounts of Cu^(2+), Cd^(2+) and Co^(2+) in the presence of an extremely large excess of Zn^(2+).
针对湿法炼锌砷盐除钴过程工况变化频繁和操作参数之间具有强耦合关系,导致操作参数优化困难的问题,提出了一种基于模糊操作模式的操作参数协同优化方法.根据大量的砷盐除钴工业运行数据,提炼初始操作模式库,根据入口工况参数,采用模糊匹配方法检索出相似操作模式,在操作模式重用时综合考虑系统参数缓慢变化和资源消耗的特点,然后采用灰色模糊最小二乘支持向量机(Least squares support vector machine,LSSVM)评估操作模式重用后的操作参数的可行性,并根据评估结果采用模糊专家规则修正操作参数.在工况发生变化时,系统能自动优化设定操作参数.工业验证结果表明,本文提出的操作参数协同优化方法保证了生产稳定,可有效提高净化后溶液中钴离子浓度的合格率和降低锌粉的消耗.
The problem of the stability analysis and controller design for Lurie networked control systems(NCSs)is investigated,in which the network-induced delays and data dropout problems are simultaneously considered.By considering that the network-induced delays are assumed to be time-varying and bounded,and analyzing the relationship between the delay and its upper bound,employing a Lyapunov-Krasovskii function and an integral inequality approach,an improved stability criterion for NCSs is proposed.Furthermore,the resulting condition is extended to design a less conservative state feedback controller by employing an improved cone complementary linearization(ICCL)algorithm.Numerical examples are provided to show the effectiveness of the method.
The solution purification process is an essential step in zinc hydrometallurgy. The performance of solution purification directly affects the normal functioning and economical benefits of zinc hydrometallurgy. This paper summarizes the authors' recent work on the modeling, optimization, and control of solution purification process. The online measurable property of the oxidation reduction potential(ORP) and the multiple reactors, multiple running statuses characteristic of the solution purification process are extensively utilized in this research. The absence of reliable online equipment for detecting the impurity ion concentration is circumvented by introducing the oxidationreduction potential into the kinetic model. A steady-state multiple reactors gradient optimization, unsteady-state operationalpattern adjustment strategy, and a process evaluation strategy based on the oxidation-reduction potential are proposed. The effectiveness of the proposed research is demonstrated by its industrial experiment.
Bei SunChunhua YangHongqiu ZhuYonggang LiWeihua Gui
