A new mechanism model for metal extraction from olivine-bearing ore by avoiding silica gel formation during leaching with hydrochloric acid including a carbonation pre-treatment is proposed.

The developed process of silica and iron recovery consisted of size classification, magnetic separation, and removal of impurities by leaching. A concentration of SiO2 from 33.4% to …

The effect of addition of sodium fluoride (NaF) on leaching of alumina was examined at varied acid concentrations, temperatures, and time of leaching. A maximum alumina leaching recovery of 91% can be achieved with 15% sulphuric acid and 3 g NaF, while leaching 10 g alkali treated fly ash residue at a temperature of 90 °C for 2 h.

Since then, this method has been applied in several studies, such as in Egyptian Zn silicate ore by Abdel Aal and Shukry (1997). Hua et al. (2002) applied microwave irradiation to the quick leaching of Zn silicate ore. The leaching percentage of Zn was 99% and the extent of dissolution of Silica and Fe were as low as 0.30% and 0.10%, respectively.

We can also see from Fig.4 that the dissolution of silica is affected little by changes of the pressure from 600 kPa to 1 600 kPa, and the maximum dissolution rate of silica is only 0.8%. 3.4 Effect of reaction time The effect of reactive time on the leaching of zinc silicate ore was studied in the reaction time range of 30 LI Cun-xion, et al ...

The pressure leaching of high silica Pb–Zn oxide ore using air as pressurized gas in sulfuric acid medium is studied systematically in the present paper. Study parameters include …

The pressure leaching of high silica Pb-Zn oxide ore using air as pressurized gas in sulfuric acid medium is studied systematically in the present paper.

Leaching of the ore at pH ca. 2, transforms the silicate compounds of the ore to colloidal silica, i.e., a gel (Matthew and MA Elsner, 1997). ED Process kinetics and optimum operating conditions have been studied for the leaching of zinc silicate ore tailings.

The low-grade zinc oxide ore with high silica was treated through the process of sulfuric acid curing and water leaching. The ore was firstly cured for 3 h by sulfuric acid with a concentration of 55.17%H 2 SO 4 and a consumption of 1288 kg/t, and then leached using water for 3 h at 50 °C with a liquid to solid ratio of 5:1 mL/g and a stirring ...

Under these conditions, the silicon ore exhibited residual Fe and Al contents of 85 and 320ppmw, respectively, achieving the highest removal rates of 97.98% and 97.85%, the SiO 2 content in silicon ore increased from 94.08% to 99.42%. Compared with leaching under atmospheric pressure leaching, pressure leaching resulted

The pressure leaching of high silica Pb–Zn oxide ore using air as pressurized gas in sulfuric acid medium is studied systematically in the present paper. Study parameters include the concentration of sulfuric acid, partial air pressure, leaching temperature, leaching time, and liquid-to-solid ratio. Conclusions (1) The pressure leaching of Pb ...

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 ...

The pressure leaching of high silica Pb-Zn oxide ore using air as pressurized gas in sulfuric acid medium is studied systematically in the present paper. Study parameters include the concentration ...

In this study, we develop an S-HGMS coupling with acid leaching technology for recovery and purification of high-grade silica from high-silica IOTs, which aim to obtain high …

A mathematical model was developed for leaching of zinc from a zinc ore containing silica. It was shown that considering only the chemical reaction of zinc dissolution is not sufficient for estimating the leaching time of the ore. A thin gelatinous layer was considered to cover the reacting core of the ore in order to correct the model prediction.

Silica is the most important raw material in glass industry. In this paper, decreasing of iron content (Fe 2 O 3 ) using agitated and vat acidic leaching were investigated. Silica sample were provided from Shenin mine located in Qazvin province, Iran. Two levels full factorial design (FFD) and multivariate regression methods were applied.

The silica mainly comes into the ore due to the accompany of quartz and silicate associated clay minerals. ... In the aim to remove residual iron content from the ore surface, the leaching 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 …

using the shrinking core model. The results show that the extraction ratio of silica increases with the increase of reaction temperature, sodium hydroxide to ore molar ratio, reaction time, and the decrease of raw ore particle size. The kinetic analysis shows that the separation of silica in laterite ore can be described by internal diusion model.

911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | Silica Ore Extraction Processing Flowsheet

In the dry test, the silica content increased from 67.0% to 95.4% in 3 steps and in the wet test, the silica content increased from 67.0% to 94.5% in 2 steps. In the dry test, 44.8% of mass and 69.7% of silica were recovered, while in the wet test, 55.4% of mass and 84.1% of silica were recovered. The concentration of the

Thus, this study proposed an eco-friendly technology for producing high-purity silica from high-silica IOTs through the coupling of superconducting high gradient magnetic separation (S …

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 …

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.

The ore (− 98 + 74 μm) was leached in solution containing 0.46 mol/L sulfuric acid for 120 min at 140 °C at different L/S ratios ranging from 6 to 10. The obtained data plotted in Fig. 7 show that L:S ratio affected significantly the leaching recovery of iron and silica but zinc slightly. The dissolution of silica increases with increasing ...

Iron ore is finely interlocked with silica, I m looking for suitable leaching solution to remove silica. The major phases are Hematite, Iron Oxide Hydroxide, Silicon oxide, Pyrolusite and minor ...

The production of high purity silica out of natural sand plays a critical role as a starting material in the industry of glass and high grade silicon.In this paper, we expose a novel processing method for the purification of sand silica.This method is a subsequent combination of thermal treatment and acid leaching.

Recovery and preparation of high-grade silica from iron ore tailings by S-HGMS coupling with acid leaching technology: Description of separation mechanism and leaching kinetics. ... Yao, Interconnected α-Fe2O3 nanoparticles prepared from leaching liquor of tin ore tailings as anode materials for lithium-ion batteries, J. Alloys Compd., № 855

the dissociation methods using non-metallic minerals as raw materials are roughly divided into two types. One is to leaching raw materials with sodium hydroxide solution to obtain

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 establish the location of the …