废弃油脂制备煤泥捕收剂的研究

通过小筛分试验和可浮性试验,说明煤泥易泥化,细泥含量高,黏附、夹带严重,导致精煤灰分偏高;煤泥属难浮煤种。采用废弃油脂制备煤泥浮选捕收剂,并进行实验室浮选试验,同时分析药剂作用机理。煤泥浮选试验表明:在精煤灰分相近的条件下,生物柴油对煤泥的捕收性要低于柴油和煤油。当柴油、煤油与生物柴油分别以质量比1∶9复合时,煤泥浮选效果较好,精煤产率分别比生物柴油提高10.52%和9.06%,浮选完善度分别提高5.32%和4.33%。GC-MS分析表明:制备的浮选捕收剂中含有不饱和结构—C=C—、含氧官能团O||—C—和疏水性较强的长链烷烃。生物柴油与非极性烃类油组合用作捕收剂时,主要存在共吸附和促进吸附两种吸附机理,提高了煤泥可浮性,促进药剂在煤浆中分散,增大药剂与煤粒表面的接触概率,降低药耗。

Collector preparation with waste cooking oil

Conduct sieve analysis and flotability experiment to investigate the experimental slime properties. The results show that, the slime is easy to degrade and difficult to wash. Large fine slime lead to high ash of clean coal. Prepare the collector with waste cooking oil and analyse its mechanism of action, conduct laboratory slime fotation test. The results show that, when the ash of clean coal is basically the same, the collecting effects of biodiesel is inferior to diesel and kerosene. When the blending ratio of diesel to biodiesel and kerosene to biodiesel is 1：9, the flotation effects is the best. Thanks to the compound oil, the clean coal yield increase by 10. 52 percent and 9.06 percent,the flotation perfection increase by 5.32 percent and 4. 33 percent. The results of GC-MS show that, the collector contains vinyl, carbonyl and long-chain alkane which has strong hydrophobicity. The adsorption mechanism of biodiesel and nonpolar hydrocarbon oil is co-adsorption and adsorption promoting. The combination improves the fotability of slime and dispersion of agent in slurry, increases the contact probability of agent and coal particle surface, decreases the agent consumption.