Effect of MO Collector on Coal Gasification Fine Slag Flotation
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摘要:
这是一篇矿物加工工程领域的文章。煤气化细渣的综合利用是现阶段的一大发展方向。煤气化细渣孔隙发达且含氧基团丰富，使得煤油等传统捕收剂难以回收其中的残炭。将油酸甲酯和煤油复配得到的药剂MO进行浮选实验，并通过激光粒度仪、红外光谱分析、接触角分析、XPS分峰拟合等手段进行机理探讨。结果表明，当MO药剂用量提高到16 kg/t时，尾矿烧失量降低到7.12%，可燃体回收率超过95.63%。MO药剂引入了极性基团酯基，其可以降低煤油表面的界面张力，增强捕收剂在水中的分散作用，从而增加残炭颗粒与捕收剂液滴的接触面积与碰撞概率，进而提高残炭颗粒的疏水性和可浮性。通过接触角分析不同药剂作用下残炭表面的疏水性，解释其与精矿产率的关系。通过XPS分析说明，MO与残炭表面的含氧官能团作用，能够在残炭的亲水位点形成有效的覆盖层，使得疏水部分朝外，降低了水化作用，增加了接触概率，增加该煤气化细渣的表面疏水性。MO药剂的使用为煤气化固体废弃物的综合利用提供了一种新途径。
Abstract:This is an article in the field of mineral processing engineering. Comprehensive utilization of coal gasification fine slag is a major development direction at present. Coal gasification fine slag has developed pores and rich oxygen groups, which makes it difficult for kerosene and other traditional collectors to recover the residual carbon. Flotation experiments were carried out on the compound MO of methyl oleate and kerosene, and the mechanism was discussed by means of laser particle size analyzer, FTIR, contact angle, and XPS. The results show that when the dosage of MO is increased to 16 kg/t, the loss on ignition of tailings is reduced to 7.12%, and the recovery of combustible is more than 95.63%. MO introduced polar group ester group, which can reduce the interfacial tension of kerosene surface, enhance the dispersing effect of collector in water, so as to increase the contact area and collision probability of carbon residue particles and collector droplet, and improve the hydrophobicity and floatability of carbon residue particles. The hydrophobicity of carbon residue was analyzed by contact angle and the relationship between the hydrophobicity and the rate of fine mineral was explained. XPS shows that the interaction between MO and oxygen-containing functional groups on the surface of the carbon residue can form an effective covering layer at the hydrophilic water level point of the carbon residue, which makes the hydrophobic part outward, reduces the hydration, increases the contact probability, and increases the surface hydrophobicity of the coal gasification fine slag. The use of MO agent provides a new way for comprehensive utilization of solid waste from coal gasification.
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表 1 CGFS的粒度组成
Table 1. Particle size composition of CFFS
粒径/mm 产率/% 烧失量/% 筛上累计/% 累计产率 累计烧失量 -0.5+0.25 25.60 46.86 25.60 46.86 -0.25+0.125 17.78 35.57 43.37 42.23 -0.125+0.074 14.94 55.65 58.32 45.67 -0.074+0.045 9.05 60.06 67.37 47.60 -0.045 32.63 39.74 100.00 45.04 总计 100.00 45.04 
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表 2 CGFS的工业分析和元素分析
Table 2. Proximate and elementary analysis of CGFS
工业分析/% 元素分析/% Mad LOIad Vad FCad C H O N S 0.55 45.04 1.98 42.55 86.08 0.52 12.21 0.66 0.53 注：Mad为CGFS空气干燥基的水分；LOIad为CGFS空气干燥基的烧失量；Vad为CGFS空气干燥基的挥发分；FCad为CGFS空气干燥基的固定碳。
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表 3 含氧基团的含量及形式
Table 3. Content analysis of functional groups
结合能/eV 官能团 含量/% UC 煤油处理后 MO处理后 284.8 C-C/C-H 68.69 74.82 76.34 286.1 C-O 14.80 14.45 12.45 287.5 C=O 4.56 5.22 5.29 289.0 COO- 11.95 5.51 5.92
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