Elevated temperature and pressure are very necessary in the leaching process because many lattice elements are enriched around crystal interfaces. 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].
The following were found to be the best conditions for the leaching process variables: 83.2051 leaching temperature, 0.0827mm particle size, 3.6179mol/dm3 acid concentration; 0.0287g/cm3 kaolin to ...
Iron is a major impurity in quartz sand and must be strictly removed in many applications. However, the iron removal rate in most of the conventional purification process is not high enough. In this study, a fast, low-energy consuming, environment-friendly and simple process for purifying quartz is demonstrated by a combination of …
Results show that after three acid leaching of silica, the total impurities concentration is …
In this study, three types of acid (sulfuric acid, citric acid, and oxalic acid) …
Acid leaching purification and neutron activation analysis of high purity …
The silica used is natural sand provided from the region of Siliana in Tunisia. The mean grain size of raw μG is 350 μm (45mesh). The color of sand silica originates from selective absorption by incorporated impurities forming the so-called color centers (Flörke et al., 2008; Makreski et al., 2004; Lin et al., 2017; Wazamtu et al., 2013; Jallad …
The silica used in this work is a natural one from the region of Siliana in Tunisia. Prior to thermal annealing, silica was dipped in an acid mixture solution, HCl:HNO 3 (AS1) with a volume proportion of 2:1 to remove metallic impurities located at the surface of silica grains. Then it was abundantly rinsed with deionized water and dried under …
Efficiency of the leaching process is improved and the removal of impurities is largely …
Phosphoric acid (H 3 PO 4) was firstly used to remove iron impurities at very low concentrations from quartz sand under ultrasound irradiation with higher efficiency, simpler technology and is less harmful to the target product compared with the other comparable methods that use industrial strong acids such as sulfuric (H 2 SO 4), …
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: …
Semantic Scholar extracted view of "Innovative Technology for Preparation of High-Purity Silica from Vein Quartz Ore Through S-HGMS Coupling Acid Leaching Process" by Yongkui Li et al. ... Hot-pressure acid leaching changes grain boundaries to deeply remove impurities in quartz sand.
Following a three-stage acid leaching process with 4 mol/LHCl +2 …
Our work consists of the study of etching behavior of silica with HF, since this acid can significantly etch silica sand and change its particles size. Thus, we have studied etching effect on particle granulometric size during a primary step of leaching process on Algerian silica sand with HF at 20% during 2, 4 and 6 hours. Therefore, a …
In our days obtaining silica sand with very high purity is a primordial stage in photovoltaic industry. The effects of acids on the removal of impurity from silica sand have been studied using leaching acids: mixture composed of HF/HCl/H 2 O with a volume composition of (1:7:24).The obtained material was characterized using Ultraviolet-Visible absorbance …
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 …
During the acid leaching process, the continuous leaching of acid solution along the fissures created by calcination-water quenching will generate newly dissolved pores and fissures, resulting in the fragmentation and shedding of the particles. ... Karimi G, Ostandnezhad K (2008) Removal of hematite from silica sand ore by reverse flotation ...
To attain high-purity silica from the remains of the rice husks after air combustion, the optimization of the process conditions of the citric acid leaching treatment and water rinsing process of ...
Following a three-stage acid leaching process with 4 mol/LHCl +2 …
To obtain high-purity silica sands by using quartz vein ore from Dabie Mountain, Anhui province, China as raw material, this study investigated a quartz purification process that involves calcination, water quenching, flotation, acid leaching, and alcohol-deionised water cleaning procedures. The composition, particle size, phase, …
Upgrading of high purity silica from silica rock by leaching method: …
cal method to model silica sand etching behavior during the leaching process. In the present work we have studied the etching effect on the particle granulometric size during a primary step of the leaching process on Algerian silica sand with hydrofluoric acid (HF) at 20% and 30% during 4 and 8 h. A new granulometric classification of the sand ...
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%)
The process involves leaching of raw diatomite with acid prior to alkali extraction, solubilization of treated diatomite with alkali solution to form sodium silicate solution, and precipitation of silica gel by adding sulfuric acid. Besides, the process includes washing of silica gel with hot solution of 6 M hydrochloric acid for three hours.
DOI: 10.1016/j.jmrt.2024.04.078 Corpus ID: 269095003; Hot-pressure acid leaching changes grain boundaries to deeply remove impurities in quartz sand @article{Ai2024HotpressureAL, title={Hot-pressure acid leaching changes grain boundaries to deeply remove impurities in quartz sand}, author={Guangtong Ai and …
This study established a complete set of critical technologies for preparing high-purity silica from vein quartz through the S-HGMS coupling acid leaching process, providing theoretical and scientific bases for industrial applications.
Soluble silica generated from acid leaching process is very difficult to filter and deceases the purity of products, and thus becomes one of hot issues in hydrometallurgy.
DOI: 10.1016/S0304-386X(97)00015-7 Corpus ID: 95714726; Removal of iron from silica sand by leaching with oxalic acid @article{Taxiarchou1997RemovalOI, title={Removal of iron from silica sand by leaching with oxalic acid}, author={Maria Taxiarchou and Dimis Panias and Iliana Douni and Ioannis Paspaliaris and A. Kontopoulos}, …
