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| 1 | Coal petrology characteristics of middlings from Qianjiaying fat coal mine显示文摘The objective of this paper is to evaluate the coal petrology characteristics of slack middlings(13–0.5 mm)of dense media separation and flotation middlings from Qianjiaying fat coal preparation plant.Phase composition,macerals distribution,microlithotype and mineral occurrence of the two middlings were studied by XRD analysis and polarized light microscopy observation.Macerals distribution and wettability of the float-and-sink products separated from the middlings after grinding was investigated to determine the liberation degree.Studies show that there are more vitrinite and mineral,but less inertinite in slack middlings than in flotation middlings.Macerals associated with mineral in slack middlings is 69.85%,by volume,which is 17.86%higher than that in flotation middlings.Minerals in slack middlings are dominated by pyrite and clay,which are disseminated with the diameter less than2 lm.The main mineral in flotation middlings is clay with size range of 2–20 lm.Single macerals in the slack middlings are diffcult to liberate due to the fne-grained minerals.After grinding,macerals associated with minerals in the slack middlings decrease to 46.73%,by volume,which is higher than in flotation middlings by 25.89%,by volume.For slack middlings with poor liberation degree,density fractions below1.8 g/cm3is hydrophobic with contact angle above 71.5°.For the well liberated flotation middlings,there is signifcant wettability difference among the float-and-sink products.This research is the theoretical basis to realize re-separation of middlings. | Zou Wenjie Cao Yijun Zhang Zhijun Liu Jiongtian | 2013 | International Journal of Mining Science and Technology2013，23，5： | 8 |
| 2 | 粒度级配对神府煤成浆性能的影响显示文摘为提高神府煤制备水煤浆的成浆性能,分析了神府煤的原煤性质,说明神府煤的成浆指标为11.55,属于很难成浆煤种。对不同粒度级配的干基煤样进行粒度分析,通过粗、细煤粉单独制浆实验和不同粒度级配煤粉的成浆性实验,研究了不同粒度级配对水煤浆成浆性的影响。结果表明:经过级配的干基煤样具有双峰粒度分布特征,适宜制浆;粗煤粉不能单独成浆,细煤粉单独制浆的最大成浆浓度为61%;粗细煤粉质量比约为1∶2时,水煤浆具有较好的流动性和稳定性,最大成浆浓度可达63.8%,此时水煤浆黏度为1000 mPa·s,符合工业水煤浆制备标准,说明合理的粒度级配可降低水煤浆黏度,增强流动性及稳定性。 | 朱雪丹 | 2014 | 洁净煤技术2014，20，4： | 8 |
| 3 | 水煤浆提浓改造方案及效果显示文摘某300 kt/a合成氨装置气化工段采用水冷壁水煤浆加压气化工艺,实际生产运行中气化装置所用水煤浆浓度偏低,通常维持在59%左右,气化装置比煤耗和比氧耗高,且气化炉烧嘴煤浆通道及喷嘴部分磨损严重,增加停炉检修频率,气化装置运行成本偏高。通过综合分析水煤浆制备过程中原料煤煤质特性、粒度分布、添加剂种类及用量对水煤浆浓度的影响后,决定采用分级研磨后配比的方法提高水煤浆的浓度。详细介绍水煤浆提浓改造方案及改造后气化装置的运行情况。实践表明,水煤浆提浓改造后,入炉煤浆浓度一度达到64%以上,较改造前提高4~5个百分点,气化效率显著提高。同时,针对提浓改造后水煤浆制备系统尚存在的问题提出了相关建议。 | 蔺伟飞 王晶 | 2019 | 中氮肥2019，0，6： | 4 |
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