Yaozhong LAN
,
Rose W.Smith
材料科学技术（英文）
The gold sulfide concentrate with a high As content in Liangshan District, Sichuan Province, China, is a potentially important resource. This paper describes experiments of dearsenification of gold concentrate in a weakly reduced atmosphere in a rotary pipe furnace. The results showed that the optimal parameters were a temperature range of 650~700℃, 15%~16% CO2 of gas and a reaction time of 30~40 min. The removal rate of arsenic and sulfur was over 95% and 25%~28%, respectively. With further oxidization and roasting, residue sulfur in the roasted materials was dropped to below 4%, and the cyanide leaching recovery of gold was over 92%.
关键词:
Gold sulfide concentrate with a high As content
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null
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null
Yaozhong LAN
,
Liaoyuan YE
,
Rose W.Smith
材料科学技术（英文）
An ever increasing demand for zinc has resulted in worldwide efforts to exploit complex and lean grade reserves of zinc oxide ore. In this study experiments were done on zinc recovery from high-fluorine bearing zinc oxide ore. First the effect of different variables on fluorine removal was investigated. Optimum experimental conditions occurred when the temperature was 1173 K, roasting time was 90 min and air flow was at a velocity of 5 m/min, the fluorine removal from the samples reached over 93%. The results obtained indicate that fluorine removal is not enhanced by adding diluted sulfuric acid or water as a binder. Second the roasted materials were leached with a diluted sulfuric acid, neutralized, flocculated and filtrated. The residual fluorine content in the leached solutions was less than 38 mg/L, which satisfies the requirement of fluorine content in the leached solutions for the production of electrolytic zinc.
关键词:
High-fluorine bearing zinc oxide ore
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null
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null
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null
SUN Jie
,
ZHANG Dian-hua
钢铁研究学报(英文版)
In accordance with the feature of pure delay in monitor AGC system for cold rolling mill, a new fuzzy self-tuning PID Smith prediction controller is developed. The position control model is deduced based on a single stand cold rolling mill, and the fuzzy controller for monitor AGC system is designed. The analysis in dynamic performance between traditional PID Smith prediction controller and fuzzy self-tuning PID Smith prediction controller is done by MATLAB toolbox. The simulation results show that fuzzy self-tuning PID Smith controller has stronger robustness, faster response and higher static accuracy than traditional PID Smith controller.
关键词:
monitor AGC;fuzzy self-tuning PID control;Smith predictor;position control
张伟
,
彭绍琴
,
李越湘
,
吕功煊
,
李树本
功能材料
用光还原方法制备了负载Cu的光催化剂Cu-TiO2,用染料Rose bengal敏化Cu-TiO2制备了具有可见光活性的Rose bengal-Cu-TiO2光催化剂,通过可见光(λ≥420nm)下分解水制氢考察了催化剂的活性,利用XRD、UV-vis吸收光谱对样品进行了表征.结果表明:载Cu增强了TiO2对可见光的吸收,Cu负载量对催化剂活性有一定的影响,Cu的最佳负载量为5%(质量分数).Cu的负载也增加了TiO2对染料的吸附,从而提高了TiO2对可见光的吸收和光催化活性.
关键词:
染料敏化
,
二氧化钛
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负载Cu
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制氢
陈鑫
,
刘祥萱
兵器材料科学与工程
采用Smith圆图对尖晶石镍铁氧体的输入阻抗进行表征，并根据传输线理论计算不同涂层厚度下尖晶石镍铁氧体的反射率。结果表明，Smith圆图中输入阻抗越接近点（α=1，β=0），阻抗匹配性越好，反射率也越小。这为基于Smith圆图的吸波材料阻抗匹配设计应用奠定了基础。
关键词:
吸波材料
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阻抗匹配
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Smith圆图
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设计
韩如成
,
李霄峰
,
王亚慧
钢铁
针对加热炉等时滞被控对象,在分析改进型Smith预估补偿控制方案的基础上,研究了滤波时间常数tf的整定规则,提出了模糊自整定Smith预估补偿控制方案.仿真研究表明,当参数发生变化时,该方案具有较强的鲁棒性和较好的控制性能.
关键词:
时滞系统
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模糊自整定
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Smith预估器
董敏
,
董广山
钢铁研究
doi:10.13228/j.b0yuan.issn1001-0963.20130452
作为现代轧机核心技术的板厚控制系统,其性能直接决定了轧制产品质量,提高该系统的控制性能具有重要意义.为此,建立了考虑延时环节的板厚控制模型,通过在Smith预估控制器的反馈回路串接低通滤波器对系统进行预估控制,用来对控制器进行补偿,以提高控制系统鲁棒性.针对改进后系统可调参数多,参数调整困难的问题,提出通过遗传算法程序进行PI控制器及滤波补偿器参数的整定.仿真研究结果表明,基于遗传算法参数寻优的Smith预估控制器低通滤波补偿算法提高了系统鲁棒性和系统控制精度,达到了期望的控制性能.
关键词:
板厚控制
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预估补偿
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低通滤波
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遗传算法
张殿华
,
张欣
,
李旭
,
孙杰
,
谷德昊
钢铁研究学报
针对带钢冷连轧机厚度控制这一纯滞后系统,常规监控AGC很难取得良好的控制性能,基于Smith预估控制器的监控AGC系统经预估补偿后可以使闭环系统特征方程中不含时滞项,从而获得更好的控制效果。基于调速调厚控制理念,建立监控AGC系统的控制模型,给出了输入量的获取方法和滤波处理方法,同时给出了速度修正量和解耦环节的计算模型。实际应用表明,该监控AGC系统稳定性好,控制精度高,实际出口厚度偏差可以控制在±0.5%以内。
关键词:
Smith预估控制器
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监控AGC
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冷连轧
