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The effects of surfactant on the solvent extraction in leaching sphalerite were investigated. It is found that sodium dodecyl sulfonate is the effective surfactant in improving the zinc recovery from sphalerite in the aqueous FeCl3-HCl-tetrachloroethylene system. Through the measurements of surface tension and viscosity of the sphalerite slurry modified with different surfactants, it is concluded that sodium dodecyl sulfonate in the concentration range of 0.05 to 0.2g L-1 can improve the viscosity of sphalerite slurry in the water, decrease the surface tension of leaching solution, prevent the aggregation of ore particles, and give very high zinc extraction . 相似文献
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掺锶锰酸镧—二氧化锆氧气传感器的制备及其性能测试 总被引:1,自引:0,他引:1
利用喷雾热解所制务的La0.8Sr0.2MnO3超微粉末制作电极材料,用8YSZ超微粉制作固体电解质,制成了氧传感器,以N2-O2混合气体为待测气体,以空气为参比气体在不同的温度及氧分压下测量了该氧传感器浓差电势的大小。实验结果表明该氧传感器的输出电势与温度和氧分压的关系符合Nernst方程并对氧分压的微量变化反应灵敏。回归得到的该氧传感器的实际刻度方程为:Em(mV)=0.0246T+0.049 相似文献
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本文以西门子s7-400控制系统在韶钢TRT机组中的应用为例,分析了该控制系统的控制精度及先进性。 相似文献
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The technique of hydrothermal stripping from mixed aqueous-organic systems is a promising method for synthexizing oxide ceramic powdcrs for high-performance applications.Some factors influcncing heterogeneous hydrothermal stripping with water from iron-loaded organic phase of naphthenic acid-isooctyl alcohol-kerosenc,such as initial concentrations of iron and naphthenic acid,concentration of Fe2O3“seed”,temperature and time,were investigated.Baseed on the experimental results,the rate equation was established.Nano-ferric oxide powders were obtained by the technique of hydrothermal stripping from the iron-loaded organic phase.The results suggest that the heterogeneous hydrothermal stripping proceeds in 3 steps:adsorption of naphthenic acid dimers and naphthenic complex of iron onto the surface of “seed”,hydrolysis of adsorbed complex of iron,and condensation of hydrolyzed complex.The process activation energy is 115kJ/mol and the heterogeneous hydrothermal stripping is controlled by a chemical reaction(the hydrolysis of naphthenic complex of iron). 相似文献
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细微碳质金矿的预处理和氰化浸取研究 总被引:3,自引:0,他引:3
本文用化学物相溶矿法研究了某地细微浸染型难处理碳质金矿的主要矿相组成及金在各主要矿物成分中的分布,并实验考察了几种不同预氧化处理方法对续后氰化浸取的影响.实验发现,碳浆浸取和增加活性碳用量,可部分消除“有机碳”的“劫金”作用;在焙烧、碱性氧压浸取、电氧化及次氯酸钠水溶液氧化等预氧化处理后,金的氰化浸取率大幅度提高,并与硫化物中疏的氧化程度呈强线性相关,与有机碳的氧化有一定相关,与碳酸盐的分解则无明显相关.结果表明,该矿石应用传统氰化法时,金浸取率低的主要影响因素是超细微粒金高度弥散分布在硫化物和硅盐矿物中;次一位的影响因素则是“有机碳”的“劫金”作用.水溶液预处理使70%以上硫化物氧化后,金的氰化浸取率从26%提高到90%以上. 相似文献
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引 言钇稳定二氧化锆 (YSZ)是制备氧化物燃料电池和氧传感器的重要材料 .电解质薄膜化是开发高输出电流密度的固体氧化物燃料电池和高灵敏度的传感器的研究方向 .电化学气相沉积 (EVD) [1~ 3] 制得的薄膜致密 ,且厚度仅 2 0~ 4 0 μm ,薄膜性能优良 ,但设备复杂 ,制备成本高 ,反应生成的氯气腐蚀性大 .激光沉积法具有设备复杂、成本高等问题 .等离子喷涂 (VPS、APS) [4 ,5] 适于大规模制膜 ,但薄膜不够致密 ,裂缝较多 .溶胶 -凝胶法 (Sol -Gel) [4 ,6 ,7] 制得的YSZ薄膜致密且薄 ,设备简单 ,但对于基片要求很严 ,… 相似文献
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