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 …
The Modeling and Optimization of Iron Removal from Silica Sand Under Ultrasound-Assisted Leaching by Response Surface Methodology. This study aimed to remove the contaminants in quartz sand by using an eco-friendly method and to obtain high-purity quartz. For this purpose, ultrasound-assisted acid leaching was applied.
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 minimum operating cost. The parameters studied were: temperature, pH of the solution, oxalate concentration, Ar purging, and ferrous ions …
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 …
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 …
ing time. Moreover, the removal rate of iron from the silica sand increases with increasing temperature. When the tem-perature reached 35 C, the removal rate of iron stabilized …
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 …
A commercial flowsheet is expected to involve the implementation of several of these separation technologies. Here the performance of different separation technologies, their testing methodologies, and difficulties in removing silica and alumina from low-grade iron ores are reviewed.
The optimum conditions for the maximum removal of 75.4% of iron with ultrasound were determined as follows: reaction temperature, 95 °C; stirring speed, 500 rpm; ultrasound power, 150 W; acid concentration, 4 g/l; reaction time 30 min. The method induces a remarkable acceleration for the iron leaching process, the leach acid …
The maximum removal of 65.8% of iron is achieved with the solutions containing 6 g/l of oxalic acid for 30 min under conventional stirring. However, the same …
1. Water Washing for Iron Removal. Water washing for iron removal is the use of hydraulic flushing to remove iron impurities from silica sand. During the flushing process, by controlling the intensity and direction of water flow, iron impurities on the …
4. Acid leaching method. If the finished quartz sand is reddish, and the iron and titanium content does not meet the product quality requirements, the acid leaching method can be used. Wash the …
Results and Discussion. The role of HF as solvent in leaching process is double: the first one is to purify or to. extract impurities from silica, in this context HF is well known by its ...
The iron removal efficiency of a process can be calculated using the equation: (4) Iron removal efficiency (%) = 1-amount of iron in leached solid samples amount of iron in original mineral × 100 The particle size and size distribution of the silica sand and the leached solid samples were determined by laser light scattering method ...
The results also showed that at 60 min adsorption time and pH 7, the maximum Iron removal efficiency with 99.99% and 99.98% was obtained using modified silica dose of 0.4 mg/l and 0.2 mg/l ...
ICP-OES (Optima 2100 DV, PerkinElmer, USA).The iron removal efficiency of a process can be calculated using the equation: Iron removal efficiency (%) = (1− amount of iron in leached solid samples amount of iron in silica sand)×100 (2) 3 Results and Discussion 3.1 Effect of Acid Concentration The experimental conditions were reaction ...
Zhang et al. studied the effect of the transition of crystal structure on Fe removal from quartz sand. The removal efficiency of Fe reached 98.7% after acid leaching at 200 °C [21]. The results of those studies show that acid leaching can effectively remove impurity elements from quartz sand, but most of them do not consider the kinetic ...
The effect of crystal structure transformation on iron impurity removal in quartz sand was studied. Research showed that the transformation of crystal structure can effectively improve the efficiency of removing iron impurities. After roasting at 900 °C for 4 h, it was found that β-quartz content was as high as 94.7%.
The purpose of these experiments is to investigate the possibility to use power ultrasound to remove iron-rich coatings from the surfaces of silica sand for glass making. Experiments show that the ...
Reverse Osmosis. If the silica is reactive silica, then Reverse Osmosis is the most practical method to remove it from the water supply. Reverse osmosis will reduce both colloidal and reactive silica, but proper pretreatment is necessary, including oxidation of iron, sulfur, and manganese, removal of chlorine, and chloramine, while hardness ...
5 Citations. Explore all metrics. Abstract. This study aimed to remove the contaminants in quartz sand by using an eco-friendly method and to obtain high-purity …
Reverse osmosis is also meant to target dissolved silicates. One of the most common methods of removing silica from drinking water is lime softening. This method is based on the reaction of calcium hydroxide (lime) with the silica colloids. This reaction works on hardness causing minerals such as calcium and magnesium, creating flakes of …
The experimental results show that there are possibilities to obtain the silica sand for glassmaking with low content of Fe2O3-below 0.015 %. On the basis of test results new technology for silica ...
sand in order to show the improvement of impurities removal from silica sand using a leaching process (fig. 6) . The results of (BEI) analysis (fig.6) come to consolidate again the DRX results. We can
A bulk of silica sand was taken from Kowli-Kosh silica sand mine to reduce its hematite content by reverse flotation. The raw sample consisted of 97.38% SiO 2 and 0.213% Fe 2 O 3 and traces of Al 2 O 3, CaO, MgO, Na 2 O, K 2 O, TiO 2. Fig. 1 illustrates a general block diagram for the hematite removal process from silica sand. The …
1.Mechanical scrubbing. Mechanical scrubbing is the removal of iron from the surface of quartz sand and iron-containing minerals adhering to the surface of quartz sand by means of mechanical external force and collision and friction between sand particles. Currently, scrubbing techniques are primarily rod scrubbing and mechanical scrubbing.
Evaluation of effects to extract iron from silica sand. E, the efficiency of iron elimination can be calculated by the following equation: (1) E = α - β α - γ %, where, α is the iron content in the original sample (Fe 2 O 3 = 0.18%); β is the iron content after treatment; γ is the limiting value of iron elimination after hot acid ...
2. Washing method. Products with higher levels of sand and high whiteness can enter the water washing process, which can remove dust and some impurities in the sand. 3. Pickling method. It is assumed that the product sand is reddish and the iron content is high will enter the pickling process. 4.
This paper deals with the removal of iron from silica sand in aqueous oxalic acid, in the absence and presence of ultrasound. The parameters investigated were the reaction temperature, stirring ...
How water filters can remove silica from water. Silica can be removed from water by five main methods. 1. Ion Exchange Resin. Ion exchange is when a stream of water is filtered through a resin substrate to remove ionic contaminants, such as dissolved silica, and replace them with particles with a similar charge.
This study aimed to remove the contaminants in quartz sand by using an eco-friendly method and to obtain high-purity quartz. For this purpose, ultrasound-assisted acid leaching was applied. Equal amounts of a mixture of diluted hydrochloric and oxalic acids were used as the solvent. Response surface methodology (RSM) was used for …