活性矿浆脱硫可行性研究及其有效组分分析

Feasibility study of desulfurization by active ore slurry and analysis of its effective components

冶炼低浓度SO_2烟气的经济、达标、无害化治理一直是冶炼行业的难题,目前处理方式主要集中在传统脱硫剂的应用,在以废治废方面的研究鲜有报道。本文提出以硫化镍铜矿选矿过程产生的活性矿浆为低浓度二氧化硫烟气的脱硫剂,建立冶炼烟气脱硫中试验装置,运用扫描电镜、原子吸收法、多种化学元素定量检测法等分析检测手段,研究活性矿浆作为一种廉价脱硫剂的有效组分及脱硫效果。结果表明:活性矿浆脱硫液pH﹥5.5时烟气可达标排放,折算SO_2吸收量为4.15kg/t矿浆,高于理论值3.68kg/t矿浆。活性矿浆中有效脱硫组分以黑云母、绿泥石、白云石、磁铁矿中的活性氧化镁、氧化钙和铁磁性物质为主,其中活性氧化镁与氧化钙参与反应的全过程,在弱酸性介质条件下铁磁性物质参与反应。脱硫后矿浆清液中重金属离子含量均低于排放标准要求,渣属于一般固体废弃物,不会对环境造成污染。

The economy,standard,harmless treatment of the low concentration SO_2 smelting flue gas is always a difficult problem in the smelting industry. The current approach focuses on the application of traditional desulfurizer and the research of treatment with waste is rarely reported. In this paper,the active ore slurry produced from mineral dressing process of Ni-Cu sulfide ores was as desulfurizer to the low concentration of sulfur dioxide flue gas,and the pilot experimental device of flue gas desulfurization was built and the effective components and desulfurization effect of the active ore slurry as a cheap desulfurizer was reported using scanning electron microscopy（SEM）,atomic absorption method and various chemical elements quantitative analysis and detection methods. The results indicate that the flue gas can reach to discharge standards when the p H of the active ore slurry is above 5.5,reduced sulfur capacity is 4.15kg/t active ore slurry,which is higher than theoretical value 3.68kg/t. The effective mineral components are mainly biotite,chlorite,dolomite,magnetite,the active magnesium oxide,calcium oxide and ferromagnetic material,in which active magnesium oxide and calcium oxide participate in the whole reaction,and the ferromagnetic material participate in reaction under the condition of weak acid medium. Heavy metal ion content in the slurry supernatant after desulfurization is lower than the discharge standard and the slag is a general solid waste,which cannot cause the environment pollution.