The Modeling and Optimization of Iron Removal from Silica …
Finally, optimization experiments were made and optimum experiment conditions were revised and determined as 83.38 °C of leaching temperature, 196.35 …
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Innovative technology for the production of high-purity sand …
Innovative technology for the production of high-purity sand silica by thermal treatment and acid leaching process. February 2019. Hydrometallurgy 185. DOI: …
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Bioleaching of Industrial Minerals
This process involves pre-heating the sand to 140 °C before it is mixed with sulphuric acid, contacted for an hour, then washed (Figure 2). Fig. 2 – Silica sand entering the hot acid leaching process. The resultant effluent from this process is neutralised with lime and the precipitate, calcium sulphate, is left to settle out in lagoons.
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Removal of iron from silica sand by leaching with 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 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 …
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Reducing impurities of silica sand by one step and two step …
This study investigated purification process to increase the silica content of quartz sand using the one step leaching method using dilute hydrochloric acid and …
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Preparation of high purity silica from silica rock by leaching …
Section snippets Materials and methods. Raw material silica rock obtained from a site at Lojing, Gua Musang, Kelantan was subjected to H 2 SO 4 acid leaching treatment. Prior to the treatment, a jaw crusher was used for crushing the silica rock, and sieved to acquire a fraction of particle size of less than 75 µm. 100 g of fine silica rock …
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Impurity removal process for high-purity silica …
Results show that after three acid leaching of silica, the total impurities concentration is reduced from 2379.9 to 1014 ppm. The concentrations of certain impurities such as P, B …
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(PDF) Application of Hot Acidic Scrubbing and Hot Agitated Leaching …
As part of an EC programme oxalic acid leaching technology has been studied on the pilot scale to reduce the iron content of the silica sand for use in the production of clear flat glass.
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Technical noteInnovative technology for the production of …
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-grade silica reached 99.51%, and the removal efficiency of Fe, Al, Mg, and Ca from …
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Acid leaching of silica sand
If you have mainly iron and at low concentration (max. about 100 ppm), you may get away with an oxalic leaching as a first step - test and see. If you have higher iron, not to mention other deleterious elements (Ba, Mg, Al, Ca, Ti, Zr, etc.) you may want to consider hydrochloric acid leaching. Sulfuric acid will not dissolve barium.
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(PDF) Production of High-Purity Silica Sand from Ivorian …
This low content coupled with a remarkable percentage in silica of 97.98 %.The tests by attrition and leaching with 40 % of sulphuric acid show, on the one hand, significant results with a high ...
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Hot-acid leach
HAL [Hot acid leaching] A process for purifying silica sand or zircon by leaching out surface iron compounds with hot sulfuric acid. Derived from an earlier process, invented in 1955 by British Industrial Sand, in which silica sand was treated with hot, gaseous hydrogen chloride. The process for cleaning zircon sand was developed jointly by ...
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Purification of silica sand by acid leaching for glass production sand
The research (project) work covers the process of the purification of silica sand by the hydrofluoric acid leaching method for glass production. Fresh samples of silica sand were collected from the study area Zawan Jos South local government plateau state. The physical properties and chemical composition of the silica sand sample were determined.
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Innovative technology for the production of high-purity sand silica …
ACCEPTED MANUSCRIPT Innovative technology for the production of high-purity sand silica by thermal treatment and acid leaching process Marouan Khalifaa *, Rachid Ouertanib, Messaoud Hajjia,c, Hatem Ezzaouiaa a Semiconductor and Advanced Technology Nanostructured Laboratory, Research and Technology Centre on Energy, …
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(PDF) The Modeling and Optimization of Iron Removal from Silica Sand …
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 ...
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High efficiency iron removal from quartz sand using phosphoric acid
For example, Zhang (2001) reported that he removed 39% of iron impurities from the silica sand by 10% HCl at 80 °C for 8 h. Further, he removed iron impurities from the silica sand for 2 h, and obtained a leaching percentage of 75.6% by 1200 °C of hot pure HCl gas. Although the latter looked good, it consumed a lot of energy and caused …
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Eco-friendly strategy for preparation of high-purity silica …
Under optimal leaching conditions, the SiO 2 purity of silica sand increased to 97.42%. Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH 2 …
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The Modeling and Optimization of Iron Removal from Silica Sand …
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 …
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Iron and Aluminium Removal from Algerian Silica Sand by Acid 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.
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Eco-friendly strategy for preparation of high-purity silica …
Under optimal leaching conditions, the SiO 2 purity of silica sand increased to 97.42%. Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH 2 C 2 O 4, the removal efficiency of Al, Ca, Fe, and Mg exceeded 97% for all cases, and the SiO 2 purity in high-purity silica reached 99.93%. Thus, this study proposes a new strategy ...
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Preparation of high purity silica from silica rock by leaching …
A previous research verified that H 2 SO 4 acid was one of the best leaching agents to remove 97.96% iron and 94.23% aluminium from quartz sand, attributed to …
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(PDF) Evaluation of acid leaching process and
In the case of water-leaching pretreatment, leaching duration for 2.5 h could yield an amorphous silica with purity of 94% and render the silica amorphous at 900 °C for 7 h.
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Glass sand processing by oxalic acid leaching and …
In order to purify silica sand and remove iron impurities, which often are in shape of staining and coloring on surface of silica particles, hot agitated acidic leaching (HAAL) using inorganic ...
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An efficient method combining thermal annealing and acid leaching …
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 …
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hot acid leaching of silica sand
As part of an EC programme oxalic acid leaching technology has been studied on the pilot scale to reduce the iron content of the silica sand for use in the production of clear flat glassHot acid leaching of silica sand process crusher mining hot acid leaching of silica sand 53 views the is the professional mining equipments manufacturer in the ...
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Calcium removal from high pure silica sand by acid leaching ; …
Calcium removal from high pure silica sand by acid leaching ; acids affinity | Request PDF. Article. Calcium removal from high pure silica sand by acid leaching ; …
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Effect of H2SO4 acid on percentages of iron and aluminium in Chlef sand
This low content coupled with a remarkable percentage in silica of 97.98 %.The tests by attrition and leaching with 40 % of sulphuric acid show, on the one hand, significant results with a high ...
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Removal of iron from silica sand by leaching with oxalic acid
On the other hand, at temperatures as low as 10°C the addition of 5 - 1 0 m g / L Fe 2÷ to the initial solution strongly accelerates the iron dissolution process. From the above phenomena it is deduced that thermodynamic and kinetic inhibitions are taking place during leaching of silica sand in oxalate solutions.
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The Modeling and Optimization of Iron Removal from …
Ultrasound-assisted acid leaching experiments were con- ducted in a 2-L-capacity glass reactor with magnetic stir- ring in a digitally controlled and heated with a hot water
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Removal of iron from silica sand by leaching with oxalic acid
The aim of our research is to improve low-grade silica from quartz sand by removing impurities, especially aluminum and iron removal, using sulfuric acid leaching. In order to achieve the aim, the effect of reaction time and sulfuric acid concentration on the leaching process was investigated.
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