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With the coal tailings from the flotation process of a coking coal preparation plant in Guizhou as the research object, the effects of four kinds of frother including methyl isobutyl methanol (MIBC), sec-octyl alcohol, terpenic oil and n-pentanol on the flotation performance of coal tailings were investigated. The test shows that the flotation indices of MIBC frother were better than those of the other three frothers with the similar dosage. A flotation process consisting of one stage of roughing, one stage of cleaning and one stage of scavenging was adopted to treat the raw coal with the ash content of 56.90%, and with dosages of kerosene and MIBC respectively at 1 000 g/t and 350 g/t, a qualified coking coal with the ash content of 11.47% and the yield of 32.03% can be produced. The results of foaming ability and foam stability measured by inflation method show that the foaming ability and foam stability of terpenic oil are the strongest, while those indices of n-pentanol are relatively weak, and those of MIBC and sec-octyl alcohol moderate. The characterization of the adhesion process between bubbles and coal particles under the action of different frothers analyzed with bubble-particle encapsulation angle and induction time measuring instrument suggests that MIBC can enhance coal-carrying capacity of bubbles, shorten particle-bubble induction time, thus bringing improved flotation effect.
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以贵州某焦煤选厂浮选尾煤泥为研究对象,考察了甲基异丁基甲醇(MIBC)、仲辛醇、2号油、正戊醇等起泡剂对浮选尾煤泥再选提质的影响及作用机理。结果表明,用量相近时,MIBC为起泡剂所获得的浮选指标优于其他3种起泡剂。煤油用量1 000 g/t、MIBC用量350 g/t时,灰分56.90%的原煤经一粗一精一扫浮选可获得灰分11.47%、产率32.03%的合格炼焦精煤产品。利用充气法研究了4种起泡剂的起泡能力及泡沫稳定性,发现2号油起泡能力和气泡稳定性均较强,正戊醇起泡能力和气泡稳定性均较弱,MIBC和仲辛醇表现适中。利用气泡-颗粒包覆角及诱导时间测量仪进一步分析了不同起泡剂作用下气泡与煤粒黏附作用过程,发现MIBC可以提升气泡的载矿能力,缩短颗粒与气泡间的诱导时间,从而获得较好的浮选效果。
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1.Mining College, Guizhou University, Guiyang 550025, Guizhou, China
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1.贵州大学 矿业学院,贵州 贵阳 550025
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梁云帆(1998—),男,贵州遵义人,硕士研究生,主要研究方向为洁净煤技术。E-mail:lyfzs19981006@163.com
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梁云帆(1998—),男,贵州遵义人,硕士研究生,主要研究方向为洁净煤技术。E-mail:lyfzs19981006@163.com
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3.贵州省非金属矿产资源综合利用重点实验室,贵州 贵阳 550025)])], figs=[ArticleFig(id=1241081044774998281, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241081036071817919, language=EN, label=null, caption=null, figureFileSmall=2mtl11l5FRASyOFWMHLBBw==, figureFileBig=RbkThDTjKIYrowSZc7xhMg==, tableContent=null), ArticleFig(id=1241081044900827414, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241081036071817919, language=CN, label=图1, caption=
捕收剂用量对煤泥浮选效果的影响, figureFileSmall=2mtl11l5FRASyOFWMHLBBw==, figureFileBig=RbkThDTjKIYrowSZc7xhMg==, tableContent=null), ArticleFig(id=1241081045190234422, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241081036071817919, language=EN, label=null, caption=null, figureFileSmall=p6vHyR3FvDbawywDRy7QWg==, figureFileBig=MityaCiwQ+8nyQ42PiGptA==, tableContent=null), ArticleFig(id=1241081045290897727, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241081036071817919, language=CN, label=图2, caption=
起泡剂种类及用量对煤泥浮选效果的影响(a)仲辛醇;(b)正戊醇;(c)2号油;(d)MIBC
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不同起泡剂用量条件下泡沫最大高度和泡沫半衰期(a)泡沫最大高度;(b)泡沫半衰期
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不同起泡剂作用下气泡表面包覆角随时间变化结果, figureFileSmall=aeTyj02UT4GLxcDzP17RAw==, figureFileBig=l081H8i/yBEDyzC7KlcynA==, tableContent=null), ArticleFig(id=1241081045966180735, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241081036071817919, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| Mad | Aad | Vdaf | FCad | Std |
|---|
| 1.42 | 56.90 | 17.96 | 23.72 | 0.70 |
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尾煤泥试样工业分析结果
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| Mad | Aad | Vdaf | FCad | Std |
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| 1.42 | 56.90 | 17.96 | 23.72 | 0.70 |
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| 粒级/mm | 产率/% | 灰分/% | 累计/% |
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| 产率 | 灰分 |
|---|
| +0.500 | 4.25 | 29.39 | 4.25 | 29.39 |
| 0.250~0.500 | 5.71 | 32.30 | 9.96 | 31.06 |
| 0.125~0.250 | 8.45 | 35.28 | 18.41 | 33.00 |
| 0.075~0.125 | 7.48 | 42.69 | 25.89 | 35.80 |
| 0.045~0.075 | 9.55 | 46.21 | 35.44 | 38.61 |
| -0.045 | 64.56 | 68.04 | 100.00 | 57.61 |
| 合计 | 100.00 | 57.61 | | |
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尾煤泥筛分试验结果
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| 粒级/mm | 产率/% | 灰分/% | 累计/% |
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| 产率 | 灰分 |
|---|
| +0.500 | 4.25 | 29.39 | 4.25 | 29.39 |
| 0.250~0.500 | 5.71 | 32.30 | 9.96 | 31.06 |
| 0.125~0.250 | 8.45 | 35.28 | 18.41 | 33.00 |
| 0.075~0.125 | 7.48 | 42.69 | 25.89 | 35.80 |
| 0.045~0.075 | 9.55 | 46.21 | 35.44 | 38.61 |
| -0.045 | 64.56 | 68.04 | 100.00 | 57.61 |
| 合计 | 100.00 | 57.61 | | |
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| 起泡剂种类 | 最佳用量/(g·t-1) | 精煤产率/% | 精煤灰分/% |
|---|
| 仲辛醇 | 350 | 38.00 | 24.21 |
| 正戊醇 | 300 | 36.53 | 19.03 |
| MIBC | 350 | 40.96 | 20.88 |
| 2号油 | 350 | 41.33 | 24.37 |
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不同起泡最佳用量下精煤产率及灰分
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| 起泡剂种类 | 最佳用量/(g·t-1) | 精煤产率/% | 精煤灰分/% |
|---|
| 仲辛醇 | 350 | 38.00 | 24.21 |
| 正戊醇 | 300 | 36.53 | 19.03 |
| MIBC | 350 | 40.96 | 20.88 |
| 2号油 | 350 | 41.33 | 24.37 |
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| 工艺流程 | 产品名称 | 产率/% | 灰分/% |
|---|
| 一粗一扫一精 | 精煤 | 32.03 | 11.74 |
| 中煤 | 13.27 | 52.11 |
| 尾煤 | 54.70 | 85.54 |
| 合计 | 100.00 | 57.47 |
| 一粗一扫二精 | 精煤 | 7.90 | 5.30 |
| 中煤 | 37.90 | 27.09 |
| 尾煤 | 54.20 | 85.18 |
| 合计 | 100.00 | 56.85 |
| 一粗一精 | 精煤 | 22.87 | 9.50 |
| 中煤 | 19.07 | 36.52 |
| 尾煤 | 58.06 | 85.33 |
| 合计 | 100.00 | 58.68 |
| 一粗二精 | 精煤 | 35.53 | 12.15 |
| 中煤 | 10.30 | 59.33 |
| 尾煤 | 54.17 | 85.64 |
| 合计 | 100.00 | 56.82 |
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不同工艺流程浮选结果
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| 工艺流程 | 产品名称 | 产率/% | 灰分/% |
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| 一粗一扫一精 | 精煤 | 32.03 | 11.74 |
| 中煤 | 13.27 | 52.11 |
| 尾煤 | 54.70 | 85.54 |
| 合计 | 100.00 | 57.47 |
| 一粗一扫二精 | 精煤 | 7.90 | 5.30 |
| 中煤 | 37.90 | 27.09 |
| 尾煤 | 54.20 | 85.18 |
| 合计 | 100.00 | 56.85 |
| 一粗一精 | 精煤 | 22.87 | 9.50 |
| 中煤 | 19.07 | 36.52 |
| 尾煤 | 58.06 | 85.33 |
| 合计 | 100.00 | 58.68 |
| 一粗二精 | 精煤 | 35.53 | 12.15 |
| 中煤 | 10.30 | 59.33 |
| 尾煤 | 54.17 | 85.64 |
| 合计 | 100.00 | 56.82 |
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| 体系 | 诱导时间/ms |
|---|
| 去离子水 | 44 |
| MIBC溶液 | 5 |
| 仲辛醇溶液 | 9 |
| 2号油溶液 | 14 |
| 正戊醇溶液 | 20 |
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起泡剂种类与诱导时间的关系
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| 体系 | 诱导时间/ms |
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| 去离子水 | 44 |
| MIBC溶液 | 5 |
| 仲辛醇溶液 | 9 |
| 2号油溶液 | 14 |
| 正戊醇溶液 | 20 |
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