acid leaching of silica

2020-09-06T22:09:41+00:00
  • US4367215A - Method of acid leaching of silicates - Google ...

    A method of leaching of the metal contents in natural silicates by means of mineral acids to produce a metal-containing leaching liquid and a solid residue is disclosed. The silicate is first crushed but the grain size of substantially all of it is kept above 0.1 mm. It is then leached for a period of time sufficient to form a solid residue consisting chiefly of silica.

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  • Comparison of Silica Leaching Behaviors from the Acid ...

    The acid-leached waste residue, produced during Al extraction from coal ash, has been destroying the environment seriously. To use this high silicon residue (70% or more) and accelerate the industrialization of Al and Si extraction from coal ash, a high-silicon coal was selected to prepare catalytic gasification ash (CGA) and combustion ash (CA). Then, the obtained CGA and CA were leached by ...

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  • Dissolution and Removal of Silicates in Acid Leaching ...

    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.

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  • Acid leaching of silica sand - Laboratory Testing ...

    Acid leaching of silica sand (4 replies) P. mallap. 4 years ago. mallap 4 years ago. Could you please provide the information/flow sheet on commercial acid leaching process of silica sand to remove impurities? Information on acid concentrations, temperature, type of acid, batch versus continuous process would be very helpful. What would be the ...

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  • (PDF) Study of Acid Leaching in the Preparation of Silicon ...

    The acid leaching of the ash so produced leads to very high purity amorphous silica. This amorphous silica can be reduced to polycrystalline silicon by magnesium at a comparatively low temperature ...

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  • Preparation of porous silica powder via selective acid ...

    Sep 20, 2020  The selective acid leaching of tobermorite can inspire the new method to produce porous silica conveniently. 4. Conclusions. Tobermorite was hydrothermally synthesized and was used to prepare porous silica through selective acid leaching method. The relationship between tobermorite's thermal behaviour and acid leaching behaviour was studied.

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  • ACID LEACHING AS EFFICIENT CHEMICAL TREATMENT FOR

    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 through citric and hydrochloric acids leaching by reflux boiling at 373K for 7200s so as to eliminate inorganic impurities

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  • Improvement of Impurities Removal from Silica Sand by ...

    (>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 leaching effect is followed by DRX and

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  • Control of silica polymerisation during ferromanganese ...

    Dec 01, 2016  Silica polymerisation is a major problem during ferromanganese slag acid leaching as it makes filtration difficult afterward. This article presents techniques on how to deal with silica polymerisation, and uses the quick leach or water-starved model described by Dufresne (1976) .

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  • The Precipitation of Silica from Acidic Zinc Leach Liquors ...

    Batch precipitation studies of silica from sulfuric acid solutions have revealed valuable information about the processes occurring. A solution of monosilicic acid (Si(OH) 4) was produced by leaching willemite (Zn 2 SiO 4) in sulphuric acid. Precipitation was monitored by measuring the turbidity and silica concentration in solution at regular ...

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

    silica from tin tailings sand by acid leaching method. Silica is a material that can be used for various purposes such as in the process of thermal treatment, building construction, and bioengineering. Based on the results of XRF analysis, acid compounds can increase the purity of Si element in tin tailings and reduce metal elements.

  • Get Price
  • Comparison of Silica Leaching Behaviors from the Acid ...

    The acid-leached waste residue, produced during Al extraction from coal ash, has been destroying the environment seriously. To use this high silicon residue (70% or more) and accelerate the industrialization of Al and Si extraction from coal ash, a high-silicon coal was selected to prepare catalytic gasification ash (CGA) and combustion ash (CA). Then, the obtained CGA and CA were leached by ...

  • Get Price
  • Acid leaching purification and neutron activation analysis ...

    Jul 30, 2009  The effects of acids on the removal of impurity from 2N grade silica have been studied using five leaching acids: 0.2 M-oxalic acid (pH 1.5 and 2.5), c-aqua regia, 2.5%—HCl/HF, and 1%—HNO3/HF. The presence of 39 impurities in the 2N grade silica and the reference material (RM, 5N grade silica) were investigated by neutron activation analysis (NAA), X-ray fluorescence (XRF), and

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

    The acid treatments increased the crystallization temperature of silica to 1200 °C and retained the amorphous state of silica for 2.5 h. 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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  • (PDF) Study of Acid Leaching in the Preparation of Silicon ...

    The acid leaching of the ash so produced leads to very high purity amorphous silica. This amorphous silica can be reduced to polycrystalline silicon by magnesium at a comparatively low temperature ...

  • Get Price
  • Improvement of Impurities Removal from Silica Sand by ...

    (>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 leaching effect is followed by DRX and

  • Get Price
  • Iron Removal Process for High-Purity Silica Sands ...

    Sep 28, 1999  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 iron impurities on the ...

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  • WO2002072896A1 - A method for the precipitation of silica ...

    The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. During leaching the silicate ion first dissolves, but simultaneously decomposes and is ...

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  • Preparation of Silica from Agricultural Leaves waste by ...

    Keywords: Toddy leaves, sugarcane leaves, acid leaching, calcination, Silica 1. INTRODUCTION In Myanmar, they are largely grown in middle region of the country. Myanmar is an industrial based on agricultural country. The agricultural wastes have a huge content of silicate materials and the cheapest source for silica production.

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  • The Precipitation of Silica from Acidic Zinc Leach Liquors ...

    Batch precipitation studies of silica from sulfuric acid solutions have revealed valuable information about the processes occurring. A solution of monosilicic acid (Si(OH) 4) was produced by leaching willemite (Zn 2 SiO 4) in sulphuric acid. Precipitation was monitored by measuring the turbidity and silica concentration in solution at regular ...

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  • Acid leaching of natural chrysotile asbestos to mesoporous ...

    Oct 10, 2017  Nanofibrous silica with a high surface area was produced from chrysotile by the acid-leaching method. Natural mineral chrysotile asbestos from Stragari, Korlace in Serbia was used as the starting material. The fibers were modified by chemical treatment with 1 M HCl and the mineral dissolution was monitored by transmission electron microscopy, X-ray powder diffraction, inductively

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  • (PDF) Extraction of Silica from Palm Ash Using Citric Acid ...

    Since leaching treatment is a proper route to extract the silica, sulphuric acid (H 2 SO 4), hydrochloric acid (HCl) and nitric acid (HNO 3) solutions are currently used in leaching treatment to ...

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  • A hydrofluoric acid-free method to dissolve and quantify ...

    May 28, 2019  An often-insurmountable obstacle for SiO 2-NP fate and hazard research is the challenging analytics of solid particulate silica species, which involves toxic and corrosive hydrofluoric acid

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  • Extraction of Silica from Palm Ashvia Citric Acid Leaching ...

    The leaching process using citric acid was applied to produce silica from palm oil mill ash (Faizul et al, 2013).The weakness of the leaching process is cannot separate the amorphous silica and ...

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  • Comparison of Silica Leaching Behaviors from the Acid ...

    The acid-leached waste residue, produced during Al extraction from coal ash, has been destroying the environment seriously. To use this high silicon residue (70% or more) and accelerate the industrialization of Al and Si extraction from coal ash, a high-silicon coal was selected to prepare catalytic gasification ash (CGA) and combustion ash (CA). Then, the obtained CGA and CA were leached by ...

  • Get Price
  • Purification of Silica from Tin Tailing by Acid Leaching ...

    silica from tin tailings sand by acid leaching method. Silica is a material that can be used for various purposes such as in the process of thermal treatment, building construction, and bioengineering. Based on the results of XRF analysis, acid compounds can increase the purity of Si element in tin tailings and reduce metal elements.

  • Get Price
  • Comparative Study of Water-Leaching and Acid-Leaching ...

    The acid treatments increased the crystallization temperature of silica to 1200 °C and retained the amorphous state of silica for 2.5 h. 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.

  • Get Price
  • (PDF) Study of Acid Leaching in the Preparation of Silicon ...

    The acid leaching of the ash so produced leads to very high purity amorphous silica. This amorphous silica can be reduced to polycrystalline silicon by magnesium at a comparatively low temperature ...

  • Get Price
  • Extraction of high-purity silica from rice husk via ...

    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.

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  • The Precipitation of Silica from Acidic Zinc Leach Liquors ...

    Batch precipitation studies of silica from sulfuric acid solutions have revealed valuable information about the processes occurring. A solution of monosilicic acid (Si(OH) 4) was produced by leaching willemite (Zn 2 SiO 4) in sulphuric acid. Precipitation was monitored by measuring the turbidity and silica concentration in solution at regular ...

  • Get Price
  • CONTROL OF SILICA POLYMERISATION DURING

    Nov 03, 2018  required before leaching (Habashi, 1993). Silica polymerisation is a major problem during ferromanganese slag acid leaching as it makes filtration difficult afterward. This article presents techniques on how to deal with silica polymerisation, and uses the quick leach or water-starved model described by Dufresne (1976).

  • Get Price
  • Preparation of Silica from Agricultural Leaves waste by ...

    Keywords: Toddy leaves, sugarcane leaves, acid leaching, calcination, Silica 1. INTRODUCTION In Myanmar, they are largely grown in middle region of the country. Myanmar is an industrial based on agricultural country. The agricultural wastes have a huge content of silicate materials and the cheapest source for silica production.

  • Get Price
  • US8114365B2 - Silica removal from pregnant leach solutions ...

    The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, preferably lean electrolyte, to induce formation of colloidal silica that can then be collected and removed.

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  • A hydrofluoric acid-free method to dissolve and quantify ...

    May 28, 2019  An often-insurmountable obstacle for SiO 2-NP fate and hazard research is the challenging analytics of solid particulate silica species, which involves toxic and corrosive hydrofluoric acid

  • Get Price
  • Purification of Silica from Tin Tailing by Acid Leaching ...

    In this article we developed a method of purifying silica from tin tailings sand by acid leaching method. Silica is a material that can be used for various purposes such as in the process of thermal treatment, building construction, and bioengineering. Based on the results of XRF analysis, acid compounds can increase the purity of Si element in ...

  • Get Price
  • High-purity amorphous silica originated in rice husks via ...

    Nov 01, 2008  High-purity amorphous silica materials with 99 wt% or more were prepared from rice husks by applying the citric acid leaching treatment and burning process at 1073 K in air. Introduction Rice husks and straws are agricultural wastes produced in a large amount, and their annual world production amounts to about 80 million tons [ 1 ].

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  • CN101654836B - Manufacturing process of high silica glass ...

    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.

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  • Silica Sand Washing Plant Quartz Sand Processing MC

    Silica sand washing plant mainly includes: quartz stone crushing and sand making, washing, grading, desliming, scrubbing, magnetic separation, flotation, acid leaching and other processes to remove the small amount or micro amount of impurities in silica sand and obtain refined silica sand or high-purity silica sand for glass, ceramics, construction, chemical and other industries.

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