Quartz mining and processing flow chart at selected
Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH2C2O4, the removal efficiency of Al, Ca, Fe, and Mg exceeded 97% for all cases, and the SiO2 purity in high-purity silica ...
Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH2C2O4, the removal efficiency of Al, Ca, Fe, and Mg exceeded 97% for all cases, and the SiO2 purity in high-purity silica ...
Leaching with 2.5 M H 2 O 2: 2.5 M H 2 SO 4 mixture at 90 °C for 30 min was observed to be the best leaching conditions with suppressed silica gel formation and the highest reported leaching ...
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...
2.1 Experimental raw materials. Hydroxy sodalite was prepared from the fly ash of a thermal power plant in Inner Mongolia after alkali leaching. The chemical reagent, hydrochloric acid solution with a concentration of 36 wt%, phenolphthalein reagent, amorphous silica, and alumina drugs of analytical pure grade and NaCl of edible salt …
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: …
One interesting result of the present work is the obtaining of pregnant leaching solution (PLS) with a high concentration of Zn (35.07 g/L) and a relatively low concentration of Fe (3.16 g/L).
Leached silica fabrics are the industry workhorse for welding cloth and light-duty, high-temperature industrial applications. From welding cloth to light-duty industrial applications, the standard leached silica fabrics are a cost-effective option. Temperature resistant, but not as durable as MaxSil®Tex silica fabrics, leached silica fabrics ...
Furthermore, experimental results from treating high-silica diasporic bauxite indicate that the reduction roasting−alkali leaching process is potential to separate silica and alumina in ...
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.
Under the conditions of the ratio of mixed acid of 5 mol/L HCl + 1 mol/L HF, leaching temperature of 353.15 K, and leaching time of 12 h, the SiO 2 purity of high …
Leaching with 2.5M H2O2: 2.5M H2SO4 mixture at 90°C for 30min was observed to be the best leaching conditions with suppressed silica gel formation and the highest reported leaching efciency with ...
Rice husk ash acid leaching and extraction is performed to produce green silica. •. The highest green silica quality has a 96.44% purity and 400.69 m 2 /g surface …
The optimized conditions are as follows: a ratio of mixed acid of 5 mol/L HCl + 1 mol/L HF, leaching temperature of 353.15 K, and leaching time of 12 h, under which, …
The leaching of silicon increased from 0.12% to 3.56% when the L/S ratio increased from 4 to 10. It has been demonstrated that silica gel is easy to generate with a high L/S ratio and high acid concentration in the leaching of zinc silicate ore (Hua et al., 2002, Harbuck, 1993, Bodas, 1996). Therefore, the leaching behaviors of silica vary with ...
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 silica leaching efficiency was calculated with Eq. ... Therefore, the leaching of lithium under a high temperature and strong alkali system is preferable to mineral dissolution, and is different from the leaching mechanism of lithium from clay using the ore acid method. 15. Fig. 9. SEM images for tailings (a), ...
The invention discloses a high silica glass fiber cloth and a manufacturing process thereof. Original sodium borosilicate glass fiber base yarns are used as raw materials in the process. The manufacturing process comprises the steps of greige cloth weaving, acid leaching, water cleaning, heat treating, rear surface treating and the like.
purity of extracted silica. In this study, the acid leaching of rice husk (RH) in 2 M hydrochloric acid solution before the calcination process at 600 C was proposed to achieve completely white silica with high specific surface area and low content of impurities. RH, selected from the Almaty Region, Kyzylorda Region, and Turkestan Region was ...
A comprehensive utilization strategy of high-silicon IOTs was proposed. • SiO 2 grade and recovery in quartz concentrate were 92.06% and 43.54%, respectively.. The SiO 2 purity of high-grade silica reached 99.51% after acid leaching process.. The thermodynamic and kinetic mechanisms of metallic impurities were investigated.
Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid …
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: …
In addition, the silica gel formation can be inhibited during the acid-leaching process at high temperatures, and the filtering of solution will become easy. 32 Considering cost saving and waste liquid reduction, the weight ratio of sulfuric acid to ore powder (A/O) was unified at 1.1, and the initial temperature of ore slurry was heated to 90 °C.
For the process of sulfation roasting–sulfate decomposition roasting–water leaching, the leaching of Cu, Ni, and Co reached up to 74.2%, 71.1%, and 69.6% respectively, under the optimal ...
This is a macroporous, high-silica glass commonly used in both flow injection and liquid chromatography systems. The support comprises particles or beads (typically ∼10 μm diameter) with bonded functionalities, such as C 18 (octadecyl), alkylamino-bonded (–NH 2 ), or zirconium-treated silica matrices.
In this paper, a novel process is proposed to extract Al2O3 and SiO2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na2CO3 followed by two-step leaching with ...
High purity silica of four nines with minimal mineral contaminants was obtained through our proposed low-energy method. The initial acid leaching of the diatomite resulted in a silica precipitate with lower contents of Ca, Mg and Fe materials. The final washing of silica slurry led to a silica product with lower Na and Fe contents.
An improved analytical procedure has been described for the spectrophotometric determination of colloidal silica in leaching solution by means of adding fluoride to convert colloidal silica into reactive silica. The method is a variation of the classical molybdenum blue method, and the optimal wavelength, te
presence of colloidal silica, which makes colloidal silica depolymerize to form reactive silica by means of adding fluoride [31-33]. Based on above-mentioned theories, this paper have found a convenient method to determine the concentration of colloidal silica in leaching solution of high silica concentration and research
The technical practicability of high temperature leaching process using willemite concentrate as the materials was developed in the study for extracting base metals. The factors affecting the leaching rates of zinc, iron, and silica from willemite concentrate were investigated, and optimized for maximum zinc extraction and minimum …