Research on preparation and properties of porous ceramsites sintered with high-ash coal slime

IF 1.3 4区工程技术 Q4 CHEMISTRY, PHYSICAL

Physicochemical Problems of Mineral Processing Pub Date : 2023-09-21 DOI:10.37190/ppmp/172665

Dan Zhu, Fanfei Min, Wenbao Lv

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Abstract

In order to realize the resource and harmless utilization of high-ash coal slime in coal preparation plants, porous ceramsites were prepared by the high-temperature sintering method with coal slime as raw material. The influences of sintering temperature, sintering time and ash content on the properties of porous ceramsites were studied by experiments, and the phase composition, micro-morphology and pore structure characteristics of ceramsites were analyzed by XRD, SEM and BET. The experimental results showed that with the increase of sintering temperature and sintering time, the amount of molten liquid in ceramsite green bodies increased, the densification degree of ceramsites increased gradually, the bulk density and the apparent density increased gradually, and the water absorption and the apparent porosity decreased gradually. However, with the increase of coal slime ash content, the quantity of pores within ceramsites increased first and then decreased. When the coal slime ash content was 55%, the bulk density of porous ceramsite sample was 0.549g/cm3, the water absorption rate was 64.63%, the specific surface area was 19.40m2/g, the crushing rate and wear rate were 0.14%, with rough surface, porous structure and excellent water absorption performance, which met the optimum performance requirements of porous ceramsites. At the same time, this research also provides a new idea and method for the reuse of high-ash coal slime resource, a by-product of coal washing and dressing

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高灰分煤泥烧结多孔陶粒的制备及性能研究

为实现高灰分煤泥在选煤厂的资源化、无害化利用，以煤泥为原料，采用高温烧结法制备多孔陶粒。通过实验研究了烧结温度、烧结时间和灰分含量对多孔陶粒性能的影响，并通过XRD、SEM和BET分析了陶粒的物相组成、微观形貌和孔隙结构特征。实验结果表明，随着烧结温度和烧结时间的升高，陶粒绿体中熔液量增加，陶粒致密度逐渐增大，体积密度和表观密度逐渐增大，吸水率和表观孔隙率逐渐降低。随着煤泥灰分的增加，陶粒内部孔隙数量先增加后减少。当煤泥灰分含量为55%时，多孔陶粒样品的容重为0.549g/cm3，吸水率为64.63%，比表面积为19.40m2/g，破碎率和磨损率为0.14%，表面粗糙，结构多孔，吸水性能优良，满足多孔陶粒的最佳性能要求。同时，本研究也为煤洗选副产物高灰分煤泥资源的资源化利用提供了新的思路和方法

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来源期刊

Physicochemical Problems of Mineral Processing CHEMISTRY, PHYSICAL-MINING & MINERAL PROCESSING

自引率

6.70%

发文量

期刊介绍： Physicochemical Problems of Mineral Processing is an international, open access journal which covers theoretical approaches and their practical applications in all aspects of mineral processing and extractive metallurgy. Criteria for publication in the Physicochemical Problems of Mineral Processing journal are novelty, quality and current interest. Manuscripts which only make routine use of minor extensions to well established methodologies are not appropriate for the journal. Topics of interest Analytical techniques and applied mineralogy Computer applications Comminution, classification and sorting Froth flotation Solid-liquid separation Gravity concentration Magnetic and electric separation Hydro and biohydrometallurgy Extractive metallurgy Recycling and mineral wastes Environmental aspects of mineral processing and other mineral processing related subjects.