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首页> 外文学位 >Behaviour of cobalt, nickel, copper, and iron during aqueous sulfur dioxide leaching of non-ferrous smelter slag.
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Behaviour of cobalt, nickel, copper, and iron during aqueous sulfur dioxide leaching of non-ferrous smelter slag.

机译：有色冶炼炉渣中二氧化硫水溶液浸出过程中钴，镍，铜和铁的行为。

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This research is the first systematic study of the interaction between smelter slag and aqueous sulphur dioxide (SO2(aq)). In Canada alone, over 2 million tonnes of smelter slags containing Co, Ni, and Cu are produced and stockpiled each year. Smelters also produce SO2, an air pollutant. The objectives of this research were to understand the characteristics of slag, the reaction of slag with SO2(aq), and to develop a novel method for extracting Co, Ni and Cu from slag using SO2(aq).; The properties of slags from different smelters were studied, with emphasis on the form of Co, Ni, Cu and Fe. Leaching experiments were carried out in a batch reactor. The parameters investigated included concentration of SO 2(aq), stirring speed, particle size, temperature, pH and O2 percentage.; The form of Co and Fe was primarily oxide (>90%), however, significant portions of Ni and Cu (30%–90%) in the slags were in the sulphide form. SO2(aq) alone, was effective in leaching Co and Fe from the slag. Ni extraction was lower due to its significant presence in the sulphide form. Cu was precipitated as Chevreul's salt. In the presence of O2, improved Cu and Ni extractions were obtained as the sulphide phases were attacked by Fe3+ generated in the system.; Thermodynamic modeling indicated that Fe precipitates as an Fe(II)-sulphite in the slag-SO2(aq) system. Fe(II)-SO32− and Fe(II)-HSO3− complexes were observed to control the solubility of the slag in SO2(aq). Experimental work on slag dissolution was found to correlate reasonably well with the thermodynamic modeling.; A new model was developed to quantify the acid and ligand effects of SO2(aq) dissolution of slag. The model was used to fit the leaching curves and good agreement was obtained. A new observation was made on the effect of particle size distribution on the modeling of fluid-solid reactions. It was discovered that for covariance (CV) values between 0.7 and 1.2, a chemical reaction controlled system erroneously follows the inert/ash layer diffusion equation if the particle size distribution is ignored in the shrinking core model. The slag-SO2(aq) system was chemical reaction controlled with activation energy of about 60 kJ/mol.
机译：该研究是对熔炼炉渣与二氧化硫水溶液（SO 2 （aq））之间相互作用的第一个系统研究。仅在加拿大，每年就生产和储存超过200万吨的含Co，Ni和Cu的冶炼炉渣。冶炼厂还产生空气污染物SO 2 。这项研究的目的是了解炉渣的特性，炉渣与SO 2 （aq）的反应，并开发一种利用SO sub 2 从炉渣中提取钴，镍和铜的新方法。 > 2 （aq）。研究了不同冶炼厂炉渣的性能，重点研究了钴，镍，铜和铁的形式。浸出实验在间歇反应器中进行。研究的参数包括SO 2 （aq）的浓度，搅拌速度，粒度，温度，pH和O 2 的百分比。钴和铁的形式主要是氧化物（> 90％），但是炉渣中很大一部分的镍和铜（30％–90％）是硫化物形式。单独的SO 2 （aq）可以有效地从炉渣中浸出Co和Fe。由于其以硫化物形式大量存在，因此镍提取量较低。 Cu沉淀为Chevreul盐。在存在O 2 的情况下，系统中生成的Fe 3 + 侵蚀了硫化物相，从而提高了Cu和Ni的萃取率。热力学模型表明，Fe在渣-SO 2 （aq）体系中以亚硫酸铁（II）的形式沉淀。观察到Fe（II）-SO 3 2− 和Fe（II）-HSO 3 -配合物控制炉渣在SO 2 （aq）中的溶解度发现熔渣溶解的实验工作与热力学模型合理地相关。建立了一个新的模型来量化SO 2 （aq）熔渣的酸和配体效应。该模型用于拟合浸出曲线并获得良好的一致性。对粒度分布对流固反应建模的影响进行了新的观察。已发现，对于在0.7和1.2之间的协方差（CV）值，如果在收缩核模型中忽略了粒度分布，则化学反应控制系统会错误地遵循惰性/灰层扩散方程。炉渣-SO 2 （aq）体系是化学反应控制的，活化能约为60 kJ / mol。

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