Design of Experimental (DOE) Analysis of Silica Sand Processing Using Spiral Concentrator

Applied Mechanics and Materials Pub Date : 2024-01-09 DOI:10.4028/p-zgm9k4

Pugalyenthiran Sinaiyah, Sanjith Udayakumar, Hashim Hussin, Sivakumar Ramakrishan

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Abstract

The main aim of this study on silica sand using a spiral concentrator using the design of experiments DOE) approach is to improve the silica content of the tailing sand for the glassmaking process. Three significant operational parameters of the spiral concentrator, namely feed rate (t/h), solid feed (wt.%), and splitter position (cm), were investigated to observe their effects on the SiO2 grade (%) and recovery of SiO2 (%) in the middlings using Design of Experiments (DOE). The raw sample was sieved to prepare the feed sample in the size range of -600+75µm, which was the suitable particle size range for the glassmaking process. The SiO2 grade (%) of each middling fraction from 33 test runs was determined from XRF analysis. The analysis determined that the feed rate and weight of the solid feed (wt.%) significantly affected the separation, while the splitter position in the investigated range (4.5-5.5cm) showed a negligible effect on the percentage and recovery of SiO2 in the middling fraction. It was observed that a maximum SiO2 grade of 94.98% was achieved at a solid feed of 25%, feed rate of 0.63 t/h, and splitter position of 5.5cm. The highest SiO2 recovery of 89.74% was achieved at the solid feed of 15%, feed rate of 0.45t/h, and splitter position of 5.0cm. A trade-off between the optimized results for SiO2 Grade (%) and recovery of SiO2 (%) responses using overlaid contour plots suggested a feed rate of 0.58 t/h of feed rate and 25 wt. % solid feed regardless of the splitter position. The customized range of parameters is expected to produce 94.51% SiO2 grade (%) and 80.11% recovery of SiO2 in the middling fraction.

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使用螺旋浓缩机加工硅砂的实验设计（DOE）分析

本研究采用实验设计 DOE）方法对使用螺旋浓缩机的硅砂进行研究，主要目的是提高玻璃制造工艺中尾砂的二氧化硅含量。研究了螺旋浓缩机的三个重要运行参数，即进料速率（吨/小时）、固体进料（重量百分比）和分料器位置（厘米），利用实验设计（DOE）观察它们对中砂中二氧化硅品位（%）和二氧化硅回收率（%）的影响。原料样品经过筛分，制备出粒度范围为 -600+75µm 的进料样品，该粒度范围适合玻璃制造工艺。通过 XRF 分析确定了 33 次试运行中每个中间馏分的二氧化硅品位（%）。分析结果表明，进料速度和固体进料重量（重量百分比）对分离效果有显著影响，而在调查范围（4.5-5.5 厘米）内的分料器位置对中间馏分中 SiO2 的百分比和回收率的影响微乎其微。据观察，在固体进料量为 25%、进料速度为 0.63 吨/小时、分离器位置为 5.5 厘米时，二氧化硅的品位最高，达到 94.98%。固体进料量为 15%、进料速度为 0.45t/h、分流器位置为 5.0cm 时，二氧化硅回收率最高，达到 89.74%。通过叠加等高线图对二氧化硅品位（%）和二氧化硅回收率（%）的优化结果进行权衡，建议进料速率为 0.58 吨/小时，固体进料重量为 25%，而不考虑分流器的位置。在定制的参数范围内，预计可生产出 94.51% 的 SiO2 品位 (%) 和 80.11% 的中间馏分 SiO2 回收率。

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Applied Mechanics and Materials

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