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Quartz bleaching by phosphoric acid: An investigation on the relationship between Fe rejection rate and colour response
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.mineng.2020.106739 Ahmet Deniz Bas
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.mineng.2020.106739 Ahmet Deniz Bas
Abstract Advances in high-tech industries have led to increasing the demand for highly pure quartz. Research on the beneficiation of quartz has been conducted to meet market requirements by different processes including hydrometallurgical ones. Even though phosphoric acid (PA) has a capacity to complex iron, and therefore has the potential to bleach quartz, this reagent has not attracted sufficient attention. This study was conducted to investigate the relationship between Fe remaining in concentrate by PA bleaching and colour responses of quartz ore sample employing Box-Behnken Design, a common designs of Response Surface Methodology. Effects of bleaching parameters (PA concentration 0–2 M, temperature 65–95 °C, bleaching time 45–180 min.) were investigated in agitated pulp condition at 400 rpm. The efficiency of the process was determined by colorimetric analysis and chemical analysis (ICP-MS). Experimental results revealed that the linear effects of bleaching parameters on Fe removal by PA were statistically significant. The lowest Fe remaining in concentrate, 79 ppm, was observed in two different conditions tested at the highest initial PA concentration (2 M) at 95 °C, over 90 min, and at 85 °C, over 180 min of bleaching. The increase in acidity resulted in the higher Fe rejection rate and the lower yellowness. Significant improvements in whiteness and yellowness were obtained by PA bleaching, whereas redness could not be improved considerably. This finding has been attributed to the presence of free dark coloured particles, and the resistance of redness source minerals like hematite to react with PA ions.
中文翻译:
磷酸对石英漂白:铁去除率与颜色响应关系的研究
摘要 高科技产业的进步导致对高纯度石英的需求不断增加。已经对石英的选矿进行了研究,以满足不同工艺(包括湿法冶金工艺)的市场需求。尽管磷酸 (PA) 具有络合铁的能力,因此具有漂白石英的潜力,但该试剂并未引起足够的关注。本研究旨在研究通过 PA 漂白保留在精矿中的铁与石英矿石样品颜色响应之间的关系,采用 Box-Behnken 设计,这是响应面方法的一种常见设计。在 400 rpm 搅拌纸浆条件下研究漂白参数(PA 浓度 0–2 M,温度 65–95 °C,漂白时间 45–180 分钟)的影响。该过程的效率由比色分析和化学分析 (ICP-MS) 确定。实验结果表明,漂白参数对 PA 除铁的线性影响具有统计学意义。在两种不同的条件下观察到浓缩物中残留的最低 Fe,79 ppm,在最高初始 PA 浓度 (2 M) 下在 95 °C 下进行了 90 分钟的测试,在 85 °C 下进行了 180 分钟以上的漂白。酸度的增加导致更高的铁去除率和更低的黄度。通过 PA 漂白获得了白度和黄度的显着改善,而红度不能显着改善。这一发现归因于游离的深色颗粒的存在,以及赤铁矿等红色源矿物与 PA 离子反应的阻力。
更新日期:2021-01-01
中文翻译:
磷酸对石英漂白:铁去除率与颜色响应关系的研究
摘要 高科技产业的进步导致对高纯度石英的需求不断增加。已经对石英的选矿进行了研究,以满足不同工艺(包括湿法冶金工艺)的市场需求。尽管磷酸 (PA) 具有络合铁的能力,因此具有漂白石英的潜力,但该试剂并未引起足够的关注。本研究旨在研究通过 PA 漂白保留在精矿中的铁与石英矿石样品颜色响应之间的关系,采用 Box-Behnken 设计,这是响应面方法的一种常见设计。在 400 rpm 搅拌纸浆条件下研究漂白参数(PA 浓度 0–2 M,温度 65–95 °C,漂白时间 45–180 分钟)的影响。该过程的效率由比色分析和化学分析 (ICP-MS) 确定。实验结果表明,漂白参数对 PA 除铁的线性影响具有统计学意义。在两种不同的条件下观察到浓缩物中残留的最低 Fe,79 ppm,在最高初始 PA 浓度 (2 M) 下在 95 °C 下进行了 90 分钟的测试,在 85 °C 下进行了 180 分钟以上的漂白。酸度的增加导致更高的铁去除率和更低的黄度。通过 PA 漂白获得了白度和黄度的显着改善,而红度不能显着改善。这一发现归因于游离的深色颗粒的存在,以及赤铁矿等红色源矿物与 PA 离子反应的阻力。