Prediction of Al（OH）3 fluidized roasting temperature based on wavelet neural network

The recycle fluidization roasting in alumina production was studied and a temperature forecast model was established based on wavelet neural network that had a momentum item and an adjustable learning rate. By analyzing the roasting process, coal gas flux, aluminium hydroxide feeding and oxygen content were ascertained as the main parameters for the forecast model. The order and delay time of each parameter in the model were deduced by F test method. With 400 groups of sample data （sampled with the period of 1.5 min） for its training, a wavelet neural network model was acquired that had a structure of {7^-21^-1}, i.e., seven nodes in the input layer, twenty-one nodes in the hidden layer and one node in the output layer. Testing on the prediction accuracy of the model shows that as the absolute error ±5.0 ℃ is adopted, the single-step prediction accuracy can achieve 90% and within 6 steps the multi-step forecast result of model for temperature is receivable.     

用于铝电解质动态测温的一种新算法

动态温度估计方法是解决铝电解过程温度在线检测的有效途径之一.本文提出了一种基于热电偶响应曲线时间常数的动态温度估计方法.实验表明,该方法具有可靠的收敛性和满意的测量精度.     

预焙铝电解槽智能模糊控制系统监控软件

用BorlandC＋＋3．1开发了集控制和槽况诊断于一体的铝电解槽智能模糊控制系统监控软件。软件具有监控功能丰富、人机界面友好、结构模块化、可扩充性强等特点。     

冶金过程人工神经网络建模及其参数优化策略

鉴于人工神经（ANN）网络在处理复杂系统方面卓越的能力,采用人工神经网络来处理冶金过程的系统建模问题,分析并建立了人工神经网络建模的框架及应用方法。在用网络模型仿真实际系统的基础上,详细论述了基于网络模型的3种系统参数优化策略。将已建立的模型应用于冶金实际生产,结果表明,预测结果与实际生产数值相当吻合。     

锂硫电池用气相生长碳纤维增强硫-多壁碳纳米管复合正极的影响(英文)

制备了锂硫电池用硫-多壁碳纳米管纳米复合材料,并分别采用气相生长碳纤维(VGCFs)和导电炭黑作为复合正极的导电添加剂,通过形貌表征(SEM)、恒流充放电测试和交流阻抗分析(EIS)研究VGCFs对硫-多壁碳纳米管复合正极的影响。结果表明:采用VGCFs作添加剂的硫-多壁碳纳米管复合电极具有三维网状结构,其首次放电比容量为1254 mA·h/g,40次循环后容量保持在716 mA·h/g。与采用导电炭黑为添加剂的电极相比,采用VGCFs为添加剂的电极具有更高的活性物质利用率和更好的循环稳定性。相互搭接的纤维状VGCFs可形成稳定的导电网络,抑制正极材料及残存放电产物的团聚堆积,维持电极的多孔性,从而改善电池的电化学性能。     

Effect of adding methods of metallic phase on microstructure and thermal shock resistance of Ni/（90NiFe2O4-10NiO） cermets

Ball mixing and electroless plating were respectively used as the adding methods of metallic phase to prepare Ni/（90NiFe2O4-10NiO） cermets for the inert anode in aluminum electrolysis. The microstructure and thermal shock resistance of cermet samples were studied. The results show that, for the samples prepared by ball mixing method, aggregation of metallic phase is found in either the green blocks or sintered samples and the extent of aggregation increases with the increase of metal content. For 6.5Ni/（90NiFe2O4-10NiO） cermets prepared with electroless plating method, the homogeneous and fine metallic particles are found in either the green compacts or sintered samples, but the relative density and thermal shock residual strength decrease by 3% and 28%-58% respectively, compared with samples prepared with ball mixing method.     

K助剂活化沥青用于石油焦中粉焦成型的研究

以常温活化沥青作为粉焦成型用胶粘剂,并在此基础上研制了可使粉焦常温低压成型的K助剂活化沥青胶粘剂。研究结果表明:当m(粉焦)=100 g、w(沥青)=12%、V(助剂K)=4.0～5.0 mL、V(水)=12 mL、成型压力为15.92 MPa和保压时间为60 s时,经1 300℃煅烧后粉焦熟块具有相对最好的综合性能,其体积电阻率小于560.00μΩ.m,真密度高于2.05 g/cm3;K助剂活化沥青胶粘剂能有效提高粉焦的利用率,具有良好的实际应用价值。     

75kA导流槽磁场及其引起的铝液流场模拟分析

以商用有限元计算软件ANSYS为计算平台,对75kA导流型铝电解槽电磁场和电磁力场分布及其对铝液流动和波动的影响进行了模拟计算。结果表明：阴极斜坡表面电磁场和电磁力场分布基本呈沿电解槽长轴对称分布,且电磁力与重力方向相同,这有利于阴极表面电磁力向聚铝沟排放,而在电磁力作用下,聚铝沟内铝液波动最大幅度为0.021m,仍保持在安全范围之内,不会引起两极短路现象的发生,表明在现有75kA普通预焙槽母线配置方案下,可以维持导流型结构电解槽的正常运行。     

硫杂质对焦反应性的影响及其机理(英文)

采用以低杂质沥青焦模拟石油焦和外掺杂的方式,研究硫杂质元素对焦反应性的影响,并通过XRD、SEM和EDS等检测手段探讨其作用机理。结果表明:在无其他杂质元素干扰的情况下,硫实际上是一种对焦的空气和CO2反应性都具有明显催化性的杂质元素。其催化作用可能是通过在焦的空气和CO2反应过程中分别引发有机硫→H2S→SO2→COS和单质硫(S x)→SO2和有机硫→H2S→COS→S x→C2S→COS两组可部分循环并具有增加碳耗和增大焦比表面积作用的反应体系来实现的。     

二步煅烧法制备高振实密度钛酸锂负极材料

以Li2CO3和纳米TiO2为原料,通过二步煅烧固相反应法制备Li4Ti5O12负极材料。研究前驱体球磨以及球磨时间对合成Li4Ti5O12样品振实密度和电化学性能的影响。借助XRD、SEM、振实密度仪和充放电测试仪、电化学综合测试仪表征Li4Ti5O12材料的物理性能和电化学性能。结果表明:球磨工艺能够提高Li4Ti5O12的纯度,并有效提高其振实密度和电化学性能;球磨时间为2 h时,所得材料的振实密度达1.70 g/cm3,0.1C首次放电比容量为174 mA.h/g,5C放电比容量达124.2 mA.h/g。