When m (acid leached residue of calcined gangue):m (Na2CO3) = 1.1 and melting at 750 °C for 2 h, the quartz and other aluminosilicates turn into nepheline, which dissolve in water.
Our results have revealed that phosphoric acid is a good leaching agent for iron removal from quartz sand because of its leaching efficiency up to 77.1%. It is about 30%–40% higher than the other comparable methods, and leaching time consumption is less than the others. The optimal values of operating parameters, such as types and ...
Xiong et al. used pressure acid leaching with hydrofluoric acid as an efficient purification process for purifying the vein quartz . However, in the conventional acid leaching process of quartz ore, quartz purification depends on an acid attack to gangue minerals, which results in high acid consumption and a long leaching time [10,11,22]. The ...
The sequential multi-step tests on sand quartz sample S8 showed that acid leaching had the most pronounced effect on enriching the SiO 2 content of the sample. Further leaching with mixed H 2 SO 4 and H 2 C 2 O 4 removed additional impurities, especially multivalent metals, including Al and Fe. The other effective processing step was WHIMS ...
In the present work, an S-HGMS coupling acid leaching technology was established to prepare high-purity silica using vein quartz ore. Firstly, the magnetic properties of different phases in vein quartz were investigated through density functional theory (DFT) calculations and arranged the phases in terms of magnetic susceptibility: FeP 2 > Al 2 SiO 5 > SiO 2 > Ca(Al 2 …
Iron removal methods including conventional pre-treatment, magnetic separation, acid leaching, microbiological, roasting, and flotation, as well as combined iron removal methods in quartz ore, are ...
By employing oxalic acid leaching, a method proven to be both effective and eco-friendly, this research aims to fill the gap in the existing literature and provide a practical solution for the ceramic industry. ... Removal of iron from quartz ore using different acids: a laboratory-scale reactor study. Miner. Process. Extr. Metall. Rev. Jul ...
until the saturation to prevent the dissolution of the quartz tank walls. The saturated solution is used for UV-Vis absorbance measurements and solid silica was filtered, rinsed and dried. ... Results show that after three acid leaching of silica, the total impurities concentration is reduced from 2379.9 to 1014 ppm. The concentrations of ...
SiO2 content of concentrate could be increased from 99.6828 % to 99.9047 %, which achieved 3N level high purity quartz, and Fe2 O3 content reduced from 0.0857 % to 0.0223 %, under the optimal ...
Zhong (2015) conducted a study on the atmospheric pressure acid leaching of quartz sand and found that a single inorganic acid demonstrated a certain level of purification for quartz raw ore. Among the inorganic acids …
Iron, the predominant impurity in quartz ores, can be substantially removed via aqueous chemical processes using organic and inorganic acids. Quartz was highly purified by leaching with sulfuric acid (H 2 SO 4) in the presence of reducing agents (oxalic acid, citric acid, and glucose).The effects of the parameters in the leaching tests were evaluated with the full …
The research conducted by the Mineral Technology Research Center, Indonesia showed that the use of sulfuric acid for the leaching process of quartz sand was also better than the use of hydrochloric acid. The results of the leaching process of quartz sand from Sambiroto, Rembang, Central Java indicated that 4 N HCl was only able to produce ...
Abstract The kinetics of atmospheric hydrochloric acid leaching of the iron-containing slime formed during quartz–leucoxene sandstone beneficiation is studied. The calculated activation energies indicate two temperature ranges of the slime leaching: a diffusion kinetic region at 40–70°C (Ea = 35.79–36.56 kJ/mol) and a kinetic region at 70–80°C (Ea = …
Purification of quartz using an environment-friendly method is important in the contaminants removal. This paper presents advanced method based on calcination pretreatment combined …
They studied the iron removal in the production of purified quartz with sulfuric acid leaching in the presence of reducing agents (oxalic, citric, glucose acid) and found that the …
the quartz sand The pur ity of quartz sand after acid leaching c an meet the demand of most industrial . sand, but there is still a long w ay to go for the requirement o f cutting-edge field. 7.
Utilizing the selective heating of microwave and the easy decomposition of NH4Cl during heating, the use of low-grade quartz sand and NH4Cl doping for microwave calcination combined with acid leaching reduced the Al content in a quartz sample from 738.8 ppm to 17.9 ppm, and the total impurity content was reduced from 1459 ppm to 85.4 ppm.
Acid leaching: quartz sand samples after flotation (2 g) were put in pre-cleaned 50 mL Teflon cups and acid-leached at 80 °C for 10 h by using an HNO 3-HCl-HF acid leaching system with 30 mL ultra-pure water, 3 mL ultra-pure HNO 3, 4 mL HCl, and 0.8 mL ultra-pure HF. After acid leaching, the quartz sand samples were washed three times with ...
The two-stage mixed acid leaching and thermal treatment process achieved a significant increase in quartz purity to 99.99% SiO 2. This enhancement can be attributed to …
This study aims to explore the mechanism of efficiently purifying quartz sand through a comparative analysis of hot-pressure acid leaching (HPAL) and atmospheric …
Throughout the alkali autoclave-acid leaching process, quartz could be completely dissolved in the alkali autoclave reaction stage. Mica and kaolinite were dissolved and recrystallized to form hydrated sodium aluminosilicates, dominated by cancrinite and sodalite, which were removed by pickling. Iron (hydrogen) oxide could be removed by acid ...
The main chemical method for purifying quartz sand is acid leaching, which is also the most commonly used because of its high leaching efficiency. Compared with the physical method, the chemical method is more expensive, …
Acid leaching is the use of quartz insoluble in acid (except HF), other impurity minerals can be dissolved by acid, further purification of quartz. Acids commonly used for acid leaching include sulfuric acid, hydrochloric acid, …
From the results of the X-Ray Fluorescent analysis it is seen that quartz sand from mining has a silica composition of 85.869% wt, water leaching results by the mining company 93.702% and sulfuric ...
After acid leaching, the resultant quartz is washed with deionized water to reach a neutral pH and to remove surface impurities, yielding HPQ 1. After a subsequent grinding process, HPQ 1 is ground to a fineness below 5000 mesh. In a clean environment at 200 °C, ...
Iron, the predominant impurity in quartz ores, can be substantially removed via aqueous chemical processes using organic and inorganic acids. Quartz was highly purified by leaching with sulfuric ...
The positive effect of oxalic acid on the iron extraction yield is clearly observed during leaching in a drum reactor. Iron extraction yields of 35–45% are obtained on treating …
The "micro pit" produced by hydrochloric acid leaching of impurities on the quartz sand surface becomes larger and deeper under the strong effect of ultrasonic waves so that acid can penetrate the quartz sand and react with impurities.
2.1 Reagents. High-grade analytical acids from Sigma-Aldrich, including nitric acid (HNO 3), hydrochloric acid (HCl), and hydrofluoric acid (HF), and ultra-pure water with a resistivity of 18.2 MΩ cm were used throughout the experiments.All concentrations for the acid solutions used in the leaching solutions are the volumetric dilution (v/v) of their commercial concentrated …
Then, the objective is that of developing a commercially viable process for the removal of iron from quartz by acid leaching in the presence of reducing and/or complexing agents such as oxalic acid: the use of oxalic acid seems to be attractive, mainly for its better action on the iron removal with respect the mineral acids, and for less ...
Rare earth elements (REEs) have been identified as valuable and critical raw materials, vital for numerous technologies and applications. With the increasing demand for and supply gap in REEs, many research studies have focused on alternative sources of REEs. This study involved an elemental and mineralogical characterisation of discarded coal from a coal …
Sedimentation of ultrafine silica particles that exist in acid leaching pulp and their separation from Pregnant Leach Solution largely determines the efficiency of a hydrometallurgical process utilizing copper oxide ore. Thickener on a larger scale can allow longer sedimentation, generating low overflow turbidity but high economic input. In this paper, the flocculation …
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, which is conducive to the acid …
A principal requirement of acid sulfate leaching is the maintenance of a free acid concentration sufficient to keep uranium and ferric ions in solution without dissolving an excessive amount of associated gangue minerals. Maintaining the correct free acid concentration is also important to ensure that re-precipitation of the uranium does not occur.
This work refers to the purification of silica from quartz sand originated from. Indonesia has very abundant reserves of silica, but progressive studies on the deposition of this material are very few, resulting in limited applications of silica. ... Implementation of Sulfuric Acid Leaching for Aluminum and Iron Removal for Improvement of Low ...
This study investigates the potential of two quartz vein ores from the Hunza District, Gilgit-Baltistan, Pakistan, as raw materials to obtain 4N8 high-purity quartz (HPQ) sand. Various quartz purification processes were …