半焦浮选试验效果及DOP捕收机理研究

发布时间：2018-02-15 09:46

本文关键词： 热解半焦半焦浮选矿物嵌布捕收剂　出处：《煤炭科学技术》2017年05期 　论文类型：期刊论文

【摘要】：为提高半焦品质,拓宽半焦应用领域,以陕北长焰煤通过固体热载体技术制得的半焦为试验原料,在对样品的工业、元素和粒度分布、表面形貌与氮吸附、矿物质种类与嵌布等理化特性进行分析的基础上,对其进行了浮选脱灰试验研究;先后探讨了常规煤油捕收剂、仲辛醇起泡剂以及调节矿浆pH值对精焦产率和灰分的影响,同时选取邻苯二甲酸二辛酯(DOP)为捕收剂进行了半焦浮选效果对比试验。结果表明,经低温热解得到的半焦水分、挥发分大部分析出,固定碳更加富集;表面孔隙结构发达,比表面积大,对浮选作业产生不利影响;采用常规浮选药剂时,在矿浆pH为6.2,Zeta电位-1.44 mV时,分选得到的精焦产率为53.79%,灰分为5.66%。在单因素最佳条件不变的情况下,采用DOP作捕收剂进行浮选试验,在用量800 g/t时得到的最终精焦产率为58.62%,灰分最低由原样的9.57%降至5.07%。通过傅里叶红外光谱分析发现DOP在半焦表面与有机质同时发生物理和化学吸附,同时生成种类多样的苯环、烃基以及芳香核等疏水性官能团,提高了浮选效果。
[Abstract]:In order to improve the quality of semi-coke and broaden the application field of semi-coke, the semi-coke prepared by long flame coal from northern Shaanxi Province through solid heat carrier technology was used as the experimental material. The industrial, element and particle size distribution, surface morphology and nitrogen adsorption of the samples were studied. Based on the analysis of the physical and chemical properties of mineral species and intercalation, the flotation deashing test was carried out, and the effects of conventional kerosene collector, secondary octanol foaming agent and adjusting the pH value of pulp on the yield and ash content of fine coke were discussed. At the same time, dioctyl phthalate (DOP) was chosen as collector to carry out the comparative experiment on the flotation effect of semi-coke. The results showed that the moisture of semi-coke obtained by pyrolysis at low temperature was mostly precipitated, the fixed carbon was more enriched, and the surface pore structure was developed. The specific surface area is large, which has a negative effect on flotation operation, and when the conventional flotation reagent is used, the fine coke yield is 53.79 and the ash is 5.66 when the pulp pH is 6.2nZeta potential -1.44mV. under the condition that the optimum condition of single factor is not changed, Using DOP as collector, flotation test was carried out. The final yield of fine coke at 800g / t was 58.62 and the ash content was the lowest from 9.57% to 5.07.The FTIR analysis showed that the physical and chemical adsorption of DOP on the surface of semi-coke and organic matter occurred simultaneously, and a variety of benzene rings were formed at the same time. Hydrophobic functional groups such as hydrocarbon groups and aromatic nuclei improve the flotation effect.
【作者单位】：煤炭科学技术研究院有限公司;中国矿业大学化工学院;
【基金】：国家自然科学基金面上基金资助项目(51474128);国家自然科学基金青年基金资助项目(51504135)
【分类号】：TD923;TD94

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