跳汰机流体动力参数变化下煤粉分选精度分析

IF 1.2 4区工程技术 Q3 MINING & MINERAL PROCESSING

Archives of Mining Sciences Pub Date : 2023-07-20 DOI:10.24425/122457

A. Surowiak

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引用次数: 7

摘要

在波兰的细粒选矿技术中，主要采用细粒跳汰工艺。在蒸汽煤粉选矿的情况下，它一直到生产的全部煤种的80%，而在炼焦煤粉的情况下它是100%。在脉动水流中进行选矿工艺的非均质进料分离的必要条件是充分释放颗粒。跳汰机工作床中颗粒的分层导致一定大小、密度和形状的颗粒在跳汰机的工作床中聚集在单个层中。引入足够量的额外水决定了颗粒群的适当释放，从而产生精矿和尾矿的分配。本文介绍了用于细粒选矿的工业跳汰机，通过三种不同的筛下附加水量设置进行跳汰取样的结果。这些量分别等于35、50和70[m3/h]。然后将收集的分离产物样品筛成窄粒度的级分，并将其分成密度级分。在这种窄粒度密度分数中，计算了硬煤细粒尾矿的分配曲线坐标，随后通过威布尔分布函数对其进行近似。根据所获得的模型分离曲线，确定了通过分离密度、可能误差和缺陷测量的分离精度。对宽粒度级分（直接用于跳汰工艺的进料和窄粒度级分）的分离效果进行了评估。分离分析的结果是尺寸密度分数允许确定颗粒尺寸变化对可能误差值的影响。将粒度密度组分的分离精度结果与宽颗粒组分（即直接进料至跳汰过程）的分离效果进行了比较。

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The Analysis of Coal Fines Separation Precision Exposed to Changeable Hydrodynamic Parameters of Jig Work

In technology of coal fines beneficiation in Poland mainly fines jigging processes are in use. In case of steam coal fines beneficiation it is till 80% of the whole amount of produced assortments, while in case of coking coal fines it is 100%. The necessary condition of not homogenous feed separation which is directed to beneficiation process in pulsating water stream is a sufficient liberation of particles. The stratification of particles in working bed causes that particles of certain size, density and shape gather in individual layers in working bed of jig. The introduction of sufficient amount of additional water determines appropriate liberation of particles group, which generates partition into concentrate and tailings. The paper presents the results of sampling of industrial jig used for the beneficiation of coal fines by three various settings of additional amount of water under sieve which is directed to jigging. These amounts were equal to 35, 50 and 70 [m 3 /h]. Collected samples of separation products were then sieved into narrow particle size fractions and divided into density fractions. In such narrow size-density fractions the coordinates of partition curves were calculated for tailings of hard coal fines, which were subsequently approximated by means of Weibull distribution function. The separation precision measured by separation density, probable error and imperfection were determined on the basis of obtained model separation curves. The evaluation of separation effects was performed for a wide particle size fraction: feed directed to jigging process and narrow particle size fractions. The analysis of separation results in size-density fractions allowed to determine the influence of particle size change on the value of probable error. The results of separation precision in size-density fractions were compared with effects of separation of wide particle fraction, i.e. feed directed to jigging process.

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来源期刊

Archives of Mining Sciences 工程技术-矿业与矿物加工

CiteScore

2.40

自引率

16.70%

发文量

审稿时长

20 months

期刊介绍： Archives of Mining Sciences (AMS) is concerned with original research, new developments and case studies in mining sciences and energy, civil engineering and environmental engineering. The journal provides an international forum for the publication of high quality research results in: mining technologies, mineral processing, stability of mine workings, mining machine science, ventilation systems, rock mechanics, termodynamics, underground storage of oil and gas, mining and engineering geology, geotechnical engineering, tunnelling, design and construction of tunnels, design and construction on mining areas, mining geodesy, environmental protection in mining, revitalisation of postindustrial areas. Papers are welcomed on all relevant topics and especially on theoretical developments, analytical methods, numerical methods, rock testing, site investigation, and case studies.