Abstract Baghouse dust collectors are using in the drying unit of Beni Idir situated in Beni-Idir Khouribga city, Morocco, to retrieve phosphates particles from dust air-drying before its expulsion through the smokestacks. The phosphate dust samples used in this study were taken from the filtration chamber of the baghouse dust collectors. The first sample (S1) is untreated calcium phosphate dust, the second (S2) is the calcium phosphate dust from the outside of filter media while the third one (S3) is the calcium phosphate dust from the inside of filter media which causes clogging depth. In this paper, the rheology and the small-angle X-ray scattering (SAXS) of the three samples were investigated to elucidate the changes in terms of local structure, the viscosity, and the shear stress parameters. The rheological behavior of the dust samples was investigated for a solid mass concentration ranging from 50 to 60%, the three samples (S1) (S2) and (S3) had a solid mass concentration of C1=60%, C2=55% and C3=50% and a shear rate in the range from 1 to 1000 s−1. The results indicated that during the filtration process, the pseudo-plastic behavior of the dust phosphate changed to that of Bingham. Comparing the results of the sample’s viscosity, we found that the viscosity decreased during the process filtration. The SAXS results suggested that the dust phosphate samples possess a fractal surface structure of enormous dust particles with a rough surface interface. This new study highlights the rheological behavior of grain phosphates that could be extrapolated to other mining powder as grains material or in solution. It is important to understand the rheological characteristics of materials, their flow, and the subsequent deformation of matter as a result of the flow.

中文翻译：

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从布袋除尘器中获得的磷酸盐粉尘的流变特性和小角度 X 射线散射研究

摘要 位于摩洛哥贝尼-伊迪尔库里布加市的贝尼伊迪尔干燥装置中使用袋式除尘器，在粉尘通过烟囱排出之前，从风干粉尘中回收磷酸盐颗粒。本研究中使用的磷酸盐粉尘样品取自袋式除尘器的过滤室。第一个样品（S1）是未经处理的磷酸钙粉尘，第二个样品（S2）是过滤介质外部的磷酸钙粉尘，第三个样品（S3）是过滤介质内部导致堵塞深度的磷酸钙粉尘. 在本文中，研究了三个样品的流变学和小角 X 射线散射 (SAXS)，以阐明局部结构、粘度和剪切应力参数的变化。研究粉尘样品的流变行为，固体质量浓度为 50% 至 60%，三个样品（S1）、（S2）和（S3）的固体质量浓度为 C1=60%、C2=55% 和C3=50% 且剪切速率在 1 到 1000 s-1 的范围内。结果表明，在过滤过程中，粉尘磷酸盐的假塑性行为转变为宾厄姆的假塑性行为。比较样品粘度的结果，我们发现在过滤过程中粘度降低。SAXS 结果表明，粉尘磷酸盐样品具有巨大粉尘颗粒的分形表面结构，表面界面粗糙。这项新研究强调了谷物磷酸盐的流变行为，可以将其作为谷物材料或溶液外推到其他采矿粉末。