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Scrubbing and Inhibiting Coagulation Effect on the Purification of Natural Powder Quartz

School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
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Minerals 2019, 9(3), 140; https://doi.org/10.3390/min9030140
Received: 27 January 2019 / Revised: 19 February 2019 / Accepted: 19 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Physical Separation and Enrichment)
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Abstract

The low removal efficiency of fine clay impurities in natural powder quartz (NPQ) is the main problem that affects the practical utilization of this natural resource. In this work, detailed characterizations of NPQ and clay impurities in NPQ were analyzed by SEM-EDS, mineral liberation analysis (MLA) and impurities distribution analysis. A combined physical purification process, including sieving, scrubbing and centrifugation, was applied to remove the clay impurities. It was observed that the fine clay impurities adhering on quartz surface were effectively liberated by scrubbing, and the content of Fe2O3 and Al2O3 in the concentrate decreased from 0.48% and 0.40% to less than 0.01% and 0.02% at pH 9.3 or when the dosage of sodium hexametaphosphate (SHMP) was 1 × 103 g/t. The coagulation interaction between quartz and impurities including hematite and orthoclase were analyzed based on the classical Deyaguin-Landau-Verwey-Overbeek (DLVO) theory. The results indicated that the main coagulation affecting the separation efficiency was the heterocoagulation between quartz and impurities and homocoagulation among hematite particles. Furthermore, adding regulators such as sodium hydroxide (NaOH) or SHMP could significantly decrease the zeta potential of minerals and thus increase the total interaction energy (VT), which could effectively improve the dispersion of these fine impurity particles, and consequently improve the removal efficiency of impurities. Reverse increase of the zeta potential of minerals in strongly alkaline solutions or excessive SHMP were detected, which was likely the main factor limiting the further improvement of the purification efficiency. View Full-Text
Keywords: natural powder quartz; scrubbing; centrifugation; DLVO theory; coagulation natural powder quartz; scrubbing; centrifugation; DLVO theory; coagulation
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Du, X.; Liang, C.; Hou, D.; Sun, Z.; Zheng, S. Scrubbing and Inhibiting Coagulation Effect on the Purification of Natural Powder Quartz. Minerals 2019, 9, 140.

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