The kinetics of leaching silica sand in hydrochloric acid solution under conventional stirring and ultrasound-assisted conditions was studied. Acid concentration, temperature, stirring speed, ultrasound frequency and particle size had significant effects on the leaching rate while the influence of ultrasound power was negligible. The leaching …
hydrometallurgy : v i i" . ELSEVIER Hydrometallurgy46 (1997) 215-227 Removal of iron from silica sand by leaching with oxalic acid M. Taxiarchou, D. Panias, I. Douni, I. Paspaliaris, A. Kontopoulos * Laboratory of Metallurgy, National Technical Universi O' of Athens P.O. Box 64056, GR 157-10 Zogrqfos, Greece Received 6 December 1996; …
Prepare of high-purity quartz using vein quartz by alkali corrosion and acid leaching processes was investigated in this study. Using alkali corrosion method, the impurities on the surface of quartz particles can be removed and the cracks on the quartz surface can be deepened and enlarged, accompanied by the existence of corrosion pits, …
The sand no untreated presents a peak at 2θ = 22.5°which corresponds to the compound of SiO2-x Alx (fig 1), Disappearance of the peak at 2θ = 22.5° in the case of leaching silica with HF(20%)
Acid leaching followed by thermal activation and water or alkaline solution leaching followed by lime or soda-lime mixture sintering are the main developed processes to produce alumina from non-bauxite ores [].However, removing silica due to its solubility before carbonation of aluminate solutions by alkaline leaching and removing iron …
In this study, three types of acid (sulfuric acid, citric acid, and oxalic acid) were considered to study the removal of impurities from silica rock via leaching process …
Zn-silicate ores [36], high silica Zn–Pb oxide ores [36] and synthetic Zn silicate [38]. However, the Zn leaching from ZLR1 did not increase with increase in temperature and acid concentration. ... Hot acid leaching is required to leach maximum Zn from the ZLRs. The difference in phases of ZLR1 and ZLR2 and 3 possibly lead to …
3692 As shown in Table 1, the purity of silica (SiO2) dramatically increased from just 45.5% in palm ash up to 92% when employing the citric acid solution with a concentration of 2% and higher.
This study investigated purification process to increase the silica content of quartz sand using the one step leaching method using dilute hydrochloric acid and comparing to two step leaching using dilute hydrochloric acid and sodium bicarbonate as solvent. The effectiveness of the process of removing impurities from quartz sand was …
An eco-friendly utilization strategy of high-silicon IOTs was proposed. • SiO 2 grade and recovery in quartz concentrate were 93.12% and 45.24%, respectively.. SiO 2 purity of high-grade silica reached 99.93% after three-stage acid leaching.. This study realizes the recycling and utilization of high-silicon IOTs.
Results show that after three acid leaching of silica, the total impurities concentration is reduced from 2379.9 to 1014 ppm. The concentrations of certain impurities such as P, B and Fe are slightly reduced after chemical purification process.
In this article, a leaching study, carried out on a quartz sample to obtain high-purity silica sands, has been presented. A leaching process by using oxalic acid to remove low iron content from the ore under study and to obtain a material suitable for fiber optic production has been evaluated. A characterization study has been carried out to …
The processing technique of quartz sand using hot phosphoric acid has been focused on in recent years due to its low cost, high efficiency, and "green" property [87,88,89]. In summary, the hot chlorination process using a chlorine or hydrogen chloride gas atmosphere can only provide favorable separation conditions rather than activation ...
Hot-pressure acid leaching changes grain boundaries to deeply remove impurities in quartz sand. 2024, Journal of Materials Research and Technology ... Innovative technology for the production of high-purity sand silica by thermal treatment and acid leaching process. Hydrometallurgy, Volume 185, 2019, pp. 204-209.
High-purity silica powder was obtained by combining acid leaching and thermal treatment of RHA while maintaining its amorphous structure throughout the process. Silica with these properties has high potential and was more in demand in application due to its high reactivity during a reaction.
Consequently, Bai employed agitated acid leaching, investigating the effects of acid concentration, temperature, and leaching time, with a constant agitation speed of 700 RPM and S:L ratio of 1:2. Through experimental design and data analysis, the study identified optimal parameters: 0.01 M acid concentration, 68.51 °C temperature, …
Sulphuric acid (H 2 SO 4), hydrochloric acid (HCl) and nitric acid (HNO 3) solutions are conventionally used in leaching treatment to prepare silica materials [1].
Silica gel formation is one of the most common problems in hydrometallurgical processing of silica containing resources such as BR with 7 wt. % Si content which deteriorates sample handling and ...
Semantic Scholar extracted view of "ACID LEACHING TECHNOLOGY FOR OBTAINING A HIGH-PURITY OF SILICA FOR PHOTOVOLTAIC AREA" by A. Kheloufi. Skip to ... The target of this study is the optimization of an industrial froth flotation process of silica sand to minimize the Fe2O3 and heavy minerals content. Multiple …
A highly reactive amorphous silica with purity of 96% was obtained from RH via 1 N hydrochloric acid leaching followed by controlled calcination at 600 °C for 2 h.
acid to extract the alumina from calcined clay18,19. (2) The sulfatization by sintering clay with ammonium sulfate followed by extracting alumina by leaching with hot water20. (3) The alkali roasting by sintering clay with lime or soda followed by extracting alumina and silica by leaching with hot water21,22. Acids
The aim of our research is to improve low-grade silica from quartz sand by removing impurities, especially aluminum and iron removal, using sulfuric acid leaching. In order to achieve the aim, the effect of reaction time and sulfuric acid concentration on the leaching process was investigated.
The aim of our research is to improve low-grade silica from quartz sand by removing impurities, especially aluminum and iron removal, using sulfuric acid leaching. In order to achieve the aim, the effect of reaction time …
Introduction to Gold and Silver Leaching The cyanide leaching process is the most important method ever developed for extracting gold from its ores. The early development of the process is attributed to a Scotchman, John Stewart Mac Arthur, in collaboration with the Forrest brothers. The method was introduced into South Africa in …
Zhang et al. used phosphoric acid as the leaching agent for quartz sand under the conditions of 80 °C temperature, 10% solid-to-liquid ratio, quartz sand with a particle size of less than 100 mesh, and leaching for 120 min. It is worth noting that the addition of organic acids had unexpected effects on impurities like Al and Fe.
The removal of iron from silica sand with oxalic acid has been studied under various experimental conditions in order to optimise the process parameters and reach a high degree of iron removal at ...
Shown in Fig. 1 is the flow sheet of the complete purification procedure. At first, an acid leaching stage was used to remove small quantities of impurity minerals prior to silica extraction from diatomite. 10 g of raw diatomite sample were leached in 2.2 M HNO 3 acid solution at 60 °C for three-hours under constant stirring. HNO 3 quantity was …
Silica polymerization is the main drawback affecting mineral carbonation using an acid-leaching process, because the formation of silica gel makes the solid-liquid separation challenging. Therefore, for the selective Ca leaching from BFS with a high Si content, the use of temperatures higher than 50 °C was recommended for the removal …