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首页> 外文会议>Greenhouse Gases in the Metallurgical Industries II - Policies, Abatement and Treatment. Waste Processing and Recycling in Mineral and Metallurgical Industries V >Dissolution behavior of non-ferrous smelter slag in aqueous solution of sulphur dioxide
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Dissolution behavior of non-ferrous smelter slag in aqueous solution of sulphur dioxide

机译：有色金属冶炼炉渣在二氧化硫水溶液中的溶解行为

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Smelter slags contain valuable metals such as Co, Ni and Cu in proportions of less than 1 wt% along with about 40 wt% of Fe and 15 wt% of Si. Although aqueous SO_2 is a versatile lixiviant for transition metals, dissolving the slag in aqueous SO_2 produces solutions in which Co and Ni concentrations are lower than that of Fe due to the low metal/ Fe ratio in the slag. To develop the options for increasing Co and Ni concentrations the solubility of slag in aqueous SO_2 was studied experimentally and theoretically using OLI, a software package for simulating electrolytes chemistry. The modeling results correlated well with experimental results. The model suggested that the species dominating the system was FeSO_3, which would precipitate out as FeSO_3.3H_2O when the concentration of Fe~(2+) reached 1.22 molal and the concentration of SO_3~(2-) was beyond 1.4 molal. In the experiments the influence of pH and solids loading were studied. The leach solution obtained after dissolution of slag at 50% solids loading had a pH of 1.85. On raising the pH to 3, precipitation occurred. Analysis of the solution collected after the addition of alkali showed over 50% reduction of Fe, Co and Ni. XRD analysis revealed the precipitate to be of amorphous nature due to the silica present. The analysis confirmed that the precipitate was mainly FeSO_3.3H_2O. The paper also discusses the potential impact of the slag on the environment.
机译：冶炼炉渣中的有价值的金属（如Co，Ni和Cu）的比例小于1 wt％，同时还含有约40 wt％的Fe和15 wt％的Si。尽管SO_2水溶液是一种通用的过渡金属浸滤剂，但由于炉渣中的金属/铁比较低，因此将炉渣溶于SO_2水溶液生成的溶液中，Co和Ni的浓度低于Fe的浓度。为了开发增加Co和Ni浓度的选项，使用OLI（用于模拟电解质化学的软件包）在理论和实验上研究了炉渣在SO_2水溶液中的溶解度。建模结果与实验结果很好地相关。该模型表明，占主导地位的物种是FeSO_3，当Fe〜（2+）的浓度达到1.22摩尔，SO_3〜（2-）的浓度超过1.4摩尔时，会以FeSO_3.3H_2O的形式析出。在实验中，研究了pH值和固体含量的影响。在固含量为50％的炉渣溶解后获得的浸出溶液的pH为1.85。将pH提高至3时，发生沉淀。添加碱后收集的溶液的分析表明，Fe，Co和Ni的还原率超过50％。 XRD分析表明，由于存在二氧化硅，沉淀物具有无定形性质。分析证实沉淀物主要是FeSO_3.3H_2O。本文还讨论了炉渣对环境的潜在影响。

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