Comparative Study on Floatation of Low Rank Coal Slime by Compound Coal-based Fischer-tropsch Synthetic Oil and Traditional Hydrocarbon Oil
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摘要:
为进一步拓展煤基费托合成油的利用途径，发展低能耗、低污染、低排放、低成本的绿色利用技术，并赋能煤化工碳达峰和碳中和，以煤基费托合成油为基础，通过复配制得新型捕收剂，并考察了其与传统烃类油在低阶煤泥浮选中的应用效果。结果表明，复配煤基费托合成油可作为煤泥浮选捕收剂使用，且在用量相同的条件下，可获得比传统烃类油捕收剂更好的浮选指标。在捕收剂用量为50 g/t时，采用煤油为捕收剂，获得的精煤灰分为9.01%、精煤产率为86.48%，而采用煤基费托合成油JZC-1、LHC-1与JCZC以质量比1∶1∶1进行三元复配作捕收剂，精煤灰分为8.96%、精煤产率为86.80%。与传统烃类油相比，复配煤基费托合成油中存在更长的碳链，且存在一定的异构烷烃，通过优化捕收剂中烷烃碳链长短和支链数量，提高了其选择性和捕收能力，因此在相同的用量条件下，可获得灰分更低、产率更高的精煤产品。
Abstract:In order to further expand the utilization of coal−based fischer−tropsch synthetic oil, develop green utilization technology with low energy consumption, low pollution, low emission and low cost, and empower carbon peaking and carbon neutralization in coal chemical industry, a new collector was prepared based on coal−based fischer−tropsch synthetic oil, and its application effect with traditional hydrocarbon oil in low−order slime flotation was investigated. The results showed that the blended coal−based fischer−tropsch synthetic oil could be used as collector for coal slime flotation, and under the condition of the same dosage, it could obtain better flotation index than traditional hydrocarbon oil collector. When the collector dosage was 50 g/t and kerosene was used as collector, the clean coal ash fraction was 9.01%, and the clean coal yield was 86.48%. When the coal−based fischer−tropsch synthetic oil JZC−1, LHC−1 and JCZC were mixed in a mass ratio of 1∶1∶1, the better flotation clean coal index could be obtained, at this time, the clean coal ash fraction was 8.96%, and the clean coal yield was 86.80%. Compared with traditional hydrocarbon oil, compound coal−based fischer−tropsch synthetic oil had longer carbon chain and some isoparaffins. By optimizing the length of alkane carbon chain and the number of branched chains in collector, its selectivity and collectivity were improved, so clean coal products with lower ash content and higher yield could be obtained under the same dosage.
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Key words:
- fischer−tropsch synthetic oil /
- compound /
- collector /
- low rank coal /
- flotation
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图 4 JZC-1与LHC-1、JCQC和JCZC复配对煤泥浮选效果的影响（a: JZC-1/JCQC；b: JZC-1/LHC-1；c: JZC-1/JCZC）
Figure 4.
图 5 JZC-1和LHC-1与JCQC和JCZC复配对煤泥浮选效果的影响（d: JZC-1/LHC-1/JCZC；e: JZC-1/ LHC-1/JCQC）
Figure 5.
表 1 煤样的工业分析
Table 1. Industrial analysis of coal samples
/% 水分 灰分 挥发分 固定碳 0.92 17.30 10.74 71.04 
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表 2 煤基费托合成油品的正构烷烃和异构烷烃含量分析
Table 2. Analysis of n-alkane and isoparaffin content of coal-based fischer-tropsch synthetic oil
/% 种类 LHC-1 JCQC JZC-1 JCZC 正构烷烃 14.93 14.73 93.73 4.08 异构烷烃 85.07 85.27 6.27 95.92
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表 3 煤基费托合成油品不同碳链长度含量
Table 3. Carbon chain length content of coal-based fischer-tropsch synthetic oil products
/% 碳链长度 LHC-1 JCQC JZC-1 JCZC C8~16 94.42 99.89 94.48 46.26 C17~25 5.58 0.11 5.52 53.74
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