昭通褐煤浮选及腐植酸提取实验

    Flotation and Humic Acid Extraction Test of Zhaotong Lignite

    • 摘要: 这是一篇矿物加工工程领域的论文。腐植酸是昭通褐煤的重要组成部分,为了高效地提取腐植酸,采用正浮选、反浮选工艺探索了昭通褐煤的较优浮选条件,并分别利用氧解法、碱溶酸析法设计正交实验,对浮选精煤进行腐植酸提取,探索了腐植酸提取的较优条件。实验结果表明:正浮选捕收剂消耗量大,在司盘80进行表面改性的条件下,浮选精煤产率较高为26.64%,灰分较低为20.08%;反浮选较佳条件为十二胺5 kg/t、糊精3 kg/t、起泡剂260 g/t,较佳浮选指标为浮选精煤产率84.35%、灰分20.52%,浮选尾煤产率15.65%、灰分36.75%,浮选完善指标12.08;氧解法较佳的提取条件为H2O2浓度0.7 mol/L、H2O2活化时间35 min、NaOH浓度0.3 mol/L、NaOH浸泡时间30 min,腐植酸提取率37.14%;碱溶酸析法较佳的提取条件为HCl浓度10%、HCl活化时间30 min、NaOH浓度0.7 mol/L、NaOH浸泡时间30 min,提取率43.80%。反浮选相对正浮选可以获得更高产率的高灰浮选精煤,碱溶酸析法提取昭通褐煤的腐植酸时,提取率更高。

       

      Abstract: This is an essay in the field of mineral processing engineering. Humic acid is an important part of Zhaotong lignite. In order to extract humic acid efficiently, the optimum flotation conditions of Zhaotong lignite were explored by using the process of direct flotation and reverse flotation. Orthogonal experiments were designed by using the method of oxygen decomposition and alkali solution-acid separation to extract humic acid from flotation cleaned coal, and the optimal conditions of humic acid extraction were explored. The results show that the positive flotation collector consumption is large, and under the condition of surface modification of Span 80, the flotation cleaned coal yield is the highest of 26.64% and ash content is the lowest of 20.08%; the optimum conditions of reverse flotation are laurylamine 5 kg/t, dextrin 3 kg/t and foaming agent 260 g/t, and the optimum flotation indexes are as follows: flotation cleaned coal yield 84.35% and ash 20.52%, flotation tailcoal yield 15.65% and ash 36.75%, and flotation perfection index 12.08; the optimum extraction conditions of oxygen decomposition are as follows: H2O2 concentration 0.7 mol/L, H2O2 activation time 35 min, NaOH concentration 0.3 mol/L, NaOH soaking time 30 min, and the extraction rate of humic acid 37.14%; the optimal extraction conditions of alkali-soluble acid chromatography are as follows: concentration of hydrochloric acid 10%, activation time of hydrochloric acid 30 min, NaOH concentration 0.7 moL/L, NaOH soaking time 30 min, and the extraction yield 43.80%. Reverse flotation can obtain higher yield of high ash flotation clean coal than normal flotation, and the extraction rate is higher when the humic acid of Zhaotong lignite is extracted by alkali solution-acid separation method.

       

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