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Recovery of High-Purity MnO2 from the Acid Leaching ...

analysis of the initial acid leaching solution (PLS1) is shown in Table I. Organic solvents for the solvent extraction process like di-2-ethylhexyl phosphoric acid (D2EHPA; 97%, Aldrich) and kerosene (low odor; Alfa Aesar) were used in their as-received form. The other chemicals utilized, like KMnO 4 and NaOH, were all of analytical grade.

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ACID LEACHING AS EFFICIENT CHEMICAL TREATMENT FOR RICE ...

High purity, high surface area silica nanoparticles could be produced from rice husk through chemical pre-treatment and combustion process. Acid leaching as efficient method of removing metallic impurities was employed during the chemical pre-treatment of rice husk prior to the burning process. In this paper, nano silica was generated from rice husk

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Purification of graphite by mixed acid method – Graphite ...

24/07/2019  The dosage of hydrofluoric acid is the most important factor in the experiment of preparing high-purity graphite by acid leaching. The dosage of hydrofluoric acid should be optimized. The experimental conditions were as follows: hydrochloric acid dosage 100 g/kg, sulfuric acid dosage 300 g/kg, reaction time 8 h, reaction temperature 80℃. The relationship between hydrofluoric acid dosage

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An efficient method combining thermal annealing and acid ...

Indeed purity degree, given by characterization of ICP–AES, ... acid leaching, which was carried out under power ultrasound, an excess of the obtained silica was abundantly dissolved in 10 ml of (AS2) solution for 4 h. Then silica was filtered and dried as described above. To further improve the purity, silica undergoes second and third stages of purification processes following the scheme ...

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Preparation of High Purity V2O5 from a Typical Low-Grade ...

However, acid leaching can get higher vanadium leaching efficiency compared to water leaching and alkaline leaching. Therefore, the main task for vanadium leaching improvement is to reduce the acid consumption. Apart from leaching, the purification of the acid leaching solution is another difficulty because this is the key step for vanadium precipitation. Commonly, there are massive impurities, such as Fe, Al, Mg, K, Na, Ca, P, and Si in the acid leaching

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Impurities removal process for high-purity silica ...

01/08/2018  At first, an acid leaching stage was used to remove small quantities of impurity minerals prior to silica extraction from diatomite. 10 g of raw diatomite sample were leached in 2.2 M HNO 3 acid solution at 60 °C for three-hours under constant stirring. HNO 3 quantity was added gradually during the three-hours of leaching.

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Process Optimization to Prepare High-purity Amorphous ...

acid leaching, it was necessary to supply a suitable amount of air to completely combust organics; for example it required an air supplement of 50 ml/min. or more. The burning temperature should be less than 1273K to obtain amorphous structured silica. High-purity amorphous silica materials with 99% or more purity were prepared from rice husks by applying the citric acid leaching treatment and ...

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Production of High-Purity TiO 2 Powder from FeTiO 3 via ...

15/03/2021  TiO 2 powder was obtained from the Ti-containing powder obtained using simple acid leaching (purity 99.5%). The size of the TiO 2 powder was less than 2 µm. Furthermore, the effects of the reaction temperature and time on the sulfurization of FeTiO 3 by Na 2 SO 4 for TiO 2

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Manganese extraction by reduction acid leaching from low ...

dioxide is rapid, resulting in an acid leaching rate of Mn of 70.15% after only 0.5 h. With the increase of reduction time, the leaching rates are improved, especially in the initial period of 0.5−2.0 h. At the reduction time of 2.0 h, the leaching rate of Mn reaches 96.47%. When the leaching time is

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Selective leaching of nickel from prereduced limonitic ...

the extent of reduction. The purity of oxygen gas was 99.6%. All other reagents were of analytical purity. 2.2 Acid Leaching of Calcine The atmospheric leaching was conducted in a two-liter seven-necks flask heated by electric heating plate. The stirrer shaft and central neck of the flask were assembled with a mercury seal to minimize the

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Acid leaching purification and neutron activation

30/07/2009  Acid leaching of silica. The base silica was split into five batches and each of them was purified by an acid leaching method: (1) 0.2 M oxalic acid pH 1.5, (2) 0.2 M oxalic acid pH 2.5, (3) c-aqua regia, (4) 2.5% HCl/HF, and (5) 1% HNO 3 /HF, respectively. Acid leaching experiments were performed under constant stirring in Teflon bottles on a ...

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Recovery of High-Purity MnO 2 from the Acid Leaching ...

23/09/2019  The current study addresses the issue of Mn recovery by: acid leaching—Cu cementation—neutralization, followed by Mn solvent extraction with D2EHPA, scrubbing with MnSO 4 solution, selective stripping and oxidative precipitation with KMnO 4. MnO 2 with a purity of above 99.5% is produced by the presented approach. The developed process has ...

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An efficient method combining thermal annealing and acid ...

Indeed purity degree, given by characterization of ICP–AES, ... acid leaching, which was carried out under power ultrasound, an excess of the obtained silica was abundantly dissolved in 10 ml of (AS2) solution for 4 h. Then silica was filtered and dried as described above. To further improve the purity, silica undergoes second and third stages of purification processes following the scheme ...

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Microwave-Assisted Acid Leaching for Recovery of Silicon ...

11/05/2020  Purity of silicon as a function of leaching temperature in the range 20–120 °C at hydrochloric acid concentration 2 mol/l, liquid–solid ratio 6:1 ml/g, leaching time 10 min and particle size 150 μm was considered.

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Process Optimization to Prepare High-purity Amorphous ...

acid leaching, it was necessary to supply a suitable amount of air to completely combust organics; for example it required an air supplement of 50 ml/min. or more. The burning temperature should be less than 1273K to obtain amorphous structured silica. High-purity amorphous silica materials with 99% or more purity were prepared from rice husks by applying the citric acid leaching treatment and ...

More

UHP-B001 - UHP Components Prepared By Acid Leaching

In order to meet and exceed increasing demands for higher purity in semiconductor industries using liquid flow measurement and control, all UHP flow sensor components are acid leached and tested for particles and metals in a dedicated Class 100 clean room. Measuring particle and metal contaminants after acid leaching insures thorough cleaning of all UHP flow sensor components. Successful ...

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Preparation of High Purity V2O5 from a Typical Low-Grade ...

separation from the acid leaching solution of stone coal. It is well known that the higher the purity of the V2O5 product , the more valuable it will be. However, limited attention was focused on the product. Ning [29] reported that vanadium precipitated as ammonium polyvanadate in acidic conditions in most plants of China and the purity of V2O5 was lower than 98.5%, resulting in the lower ...

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Gold Hydrometallurgy - Refining to High Purity

02/07/2017  High-purity gold was precipitated from the aqua regia solution with oxalic acid, sulfurous acid, sodium bisulfite, and gaseous sulfur dioxide. The leaching-precipitation experiments recovered 99.9 pct of the gold. The gold precipitates ranged in fineness from 997 to 999 fine.

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Selective leaching of nickel from prereduced limonitic ...

All other reagents were of analytical purity. 2.2 Acid Leaching of Calcine The atmospheric leaching was conducted in a two-liter seven-necks flask heated by electric heating plate. The stirrer shaft and central neck of the flask were assembled with a mercury seal to minimize the evaporation of water. Other necks of the flask were sealed by plastic plugs to hold the thermal probe, sampling tube ...

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Manganese extraction by reduction acid leaching from low ...

Manganese extraction by reduction−acid leaching from low-grade manganese oxide ores using CaS as reductant Chang-xin LI,Hong ZHONG, Shuai WANG, Jian-rong XUE, Fang-fang WU, Zhen-yu ZHANG School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China Received 6 June 2014; accepted 25 September 2014 Abstract: The extraction of manganese from low

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Effect of acid leaching conditions on impurity removal ...

18/07/2017  It is shown that acid leaching by the applied method is effective to reach more than 70% of phosphorous removal. It is also shown that the purity of silicon is dependent on the total Mg removal and effectiveness of leaching on removing the Mg 2 Si phase. The effect of magnesium addition into a commercial silicon and its leaching refining behavior is studied for producing solar grade silicon ...

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Microwave-Assisted Acid Leaching for Recovery of Silicon ...

11/05/2020  Purity of silicon as a function of leaching temperature in the range 20–120 °C at hydrochloric acid concentration 2 mol/l, liquid–solid ratio 6:1 ml/g, leaching time 10 min and particle size 150 μm was considered.

More

An efficient method combining thermal annealing and acid ...

Indeed purity degree, given by characterization of ICP–AES, ... acid leaching, which was carried out under power ultrasound, an excess of the obtained silica was abundantly dissolved in 10 ml of (AS2) solution for 4 h. Then silica was filtered and dried as described above. To further improve the purity, silica undergoes second and third stages of purification processes following the scheme ...

More

Acid leaching purification and neutron activation

01/11/2009  Read "Acid leaching purification and neutron activation analysis of high purity silicas, Journal of Radioanalytical and Nuclear Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Process Optimization to Prepare High-purity Amorphous ...

acid leaching, it was necessary to supply a suitable amount of air to completely combust organics; for example it required an air supplement of 50 ml/min. or more. The burning temperature should be less than 1273K to obtain amorphous structured silica. High-purity amorphous silica materials with 99% or more purity were prepared from rice husks by applying the citric acid leaching treatment and ...

More

Preparation of High Purity V2O5 from a Typical Low-Grade ...

separation from the acid leaching solution of stone coal. It is well known that the higher the purity of the V2O5 product , the more valuable it will be. However, limited attention was focused on the product. Ning [29] reported that vanadium precipitated as ammonium polyvanadate in acidic conditions in most plants of China and the purity of V2O5 was lower than 98.5%, resulting in the lower ...

More

UHP-B001 - UHP Components Prepared By Acid Leaching

In order to meet and exceed increasing demands for higher purity in semiconductor industries using liquid flow measurement and control, all UHP flow sensor components are acid leached and tested for particles and metals in a dedicated Class 100 clean room. Measuring particle and metal contaminants after acid leaching insures thorough cleaning of all UHP flow sensor components. Successful ...

More

Insights into Alkali-Acid Leaching of Sericite ...

Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated.

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Improvement of Impurities Removal from Silica Sand by ...

The silicon solar grade destined for the photovoltaic applications required a high purity (>99.9999%), its cycle of production consists firstly of enriching the silica by acid leaching. In the present work, we have tried to enhance the extraction rate of impurities from Algerian silica sand by means of sequential leaching process using several solvents like HF, HCl, H2SO4, NaOH. The study of ...

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Manganese extraction by reduction acid leaching from low ...

Manganese extraction by reduction−acid leaching from low-grade manganese oxide ores using CaS as reductant Chang-xin LI,Hong ZHONG, Shuai WANG, Jian-rong XUE, Fang-fang WU, Zhen-yu ZHANG School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China Received 6 June 2014; accepted 25 September 2014 Abstract: The extraction of manganese from low

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Effect of acid leaching conditions on impurity removal ...

18/07/2017  It is shown that acid leaching by the applied method is effective to reach more than 70% of phosphorous removal. It is also shown that the purity of silicon is dependent on the total Mg removal and effectiveness of leaching on removing the Mg 2 Si phase. The effect of magnesium addition into a commercial silicon and its leaching refining behavior is studied for producing solar grade silicon ...

More

An efficient method combining thermal annealing and acid ...

Indeed purity degree, given by characterization of ICP–AES, ... acid leaching, which was carried out under power ultrasound, an excess of the obtained silica was abundantly dissolved in 10 ml of (AS2) solution for 4 h. Then silica was filtered and dried as described above. To further improve the purity, silica undergoes second and third stages of purification processes following the scheme ...

More

Acid leaching purification and neutron activation

01/11/2009  Read "Acid leaching purification and neutron activation analysis of high purity silicas, Journal of Radioanalytical and Nuclear Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

More

Process Optimization to Prepare High-purity Amorphous ...

acid leaching, it was necessary to supply a suitable amount of air to completely combust organics; for example it required an air supplement of 50 ml/min. or more. The burning temperature should be less than 1273K to obtain amorphous structured silica. High-purity amorphous silica materials with 99% or more purity were prepared from rice husks by applying the citric acid leaching treatment and ...

More

Purification of Silica from Tin Tailing by Acid Leaching ...

acid. The interesting thing is that leaching using nitric acid. The higher concentration of nitric acid, the higher level of silica in the sand tailing. The level of silica in the leaching process reached the highest value of 90.40% for 15% nitric acid concentration. The silica levels for 5%-HNO3 and 10%-HNO3 were 89.35% and 89.42% ...

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Comparative Study of Water-Leaching and Acid-Leaching ...

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. The RHA silica yielded by water-leaching pretreatment presented a comparable enhancing effect to that of acid leaching on hydration and improved the strength of cement. Furthermore, compared with the acid-leaching method ...

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UHP-B001 - UHP Components Prepared By Acid Leaching

In order to meet and exceed increasing demands for higher purity in semiconductor industries using liquid flow measurement and control, all UHP flow sensor components are acid leached and tested for particles and metals in a dedicated Class 100 clean room. Measuring particle and metal contaminants after acid leaching insures thorough cleaning of all UHP flow sensor components. Successful ...

More

Sulfurous Acid Leaching of Kaolin for Preparing Alumina

06/09/2017  Sulfurous acid leaching of calcined kaolin with a caustic purification does not produce alumina that meets cell feed specifications for alumina purity. A major contaminant is sulfur, which is not decreased by caustic purification. The process requires long leach duration and yields low alumina extraction. Escape of SO2 because of leakages in pressurized equipment presents an environmental ...

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Insights into Alkali-Acid Leaching of Sericite ...

Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated.

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AU760073B2 - Method for the production of a high-purity ...

Method for the production of a high-purity concentrated magnesium chloride solution by acid leaching and neutralization Download PDF Info Publication number AU760073B2. ...

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