sulfuric acid silicate

The Role of Sulfuric Acid in Continental Weathering: …

The H 2 SO 4-mediated silicate weathering acid does not contribute an appreciable amount of dissolved inorganic carbon to rivers. The δ 13 C DIC produced through H 2 CO 3 acid-mediated silicate weathering is most likely to mimic the soil-CO 2 value, which is ∼−24‰ ± 2‰ for C3 plant-dominated basins (C. Li & Ji, 2016).

Kinetics of sulfuric acid leaching of low-grade zinc silicate …

The results of a leaching kinetics study of low-grade zinc silicate ore with sulfuric acid are presented. Effect of ore particle size, reaction temperature, and acid concentration on zinc dissolution rate were determined. The results obtained show that leaching of about 94% of zinc is achieved using −200+270 mesh ore particle size at a ...

Strength performance of alkali activated structural …

The alkali activator was produced using sodium silicate, sodium hydroxide and water. Flay ash and slage as waste materials were replaced by 90% of ordinary Portland cement to produce the geopolymer concrete. Also, ordinary cement concrete produced to comparison. ... The specimens of all mixes exposed to sulfuric acid with …

Silica-Based Solid Acid Catalyst with Different

Silica-based solid acid catalysts have been successfully prepared and characterized. This research aimed to study the effect of sulfuric acid and calcination …

Silica sulfuric acid: a reusable solid catalyst for one pot …

silica sulfuric acid; solvent-free condition. Abstract. A convenient and efficient methodology for the synthesis of densely substituted pyrrole-fused isocoumarins, which employs solid- …

Evaluation of Sulfuric Acid-Induced Degradation of Potassium Silicate …

Due to the sulfuric acid, Portlandit and Calcium silicate hydrate of the hardened binder within the concrete get dissolved and new reaction products like ettringite are built, which can further increase the process of deterioration by crack formations and a higher exposed surface of the concrete .

Sulfuric acid weathering counteracts CO2 drawdown from silicate …

The CO2 released from sulfuric acid-induced carbonate weathering would exceed the CO2 consumed by silicate weathering, making the river basins in Guangxi net CO2 sources on geological timescales.

Silica Precipitation in Acidic Solutions: Mechanism, pH …

In fact, the product of the chemical reaction of sulfuric acid with sodium silicate will be in the form of a silica gel as Na 2 SO 4 and H 4 SiO 4, whenever the pH value is decreased to the lower ...

Effect of Silica Fume on Metakaolin Geopolymers' Sulfuric Acid

For this reason, the pozzolan is used to manufacture alkali silicate solutions [34,35,36], to increase the SiO 2 /K 2 O resp. SiO 2 /Na 2 O modulus of an existing alkali silicate solution ... Tests with sulfuric acid may be seen as an accelerated laboratory-testing procedure compared to microbially induced sulfuric acid attack in sewers ...

Scandium extraction from silicates by hydrometallurgical …

The silicates were dried in oven at 50 °C for 12 h before the experiment.For each batch sulfuric acid curing experiment, 2 g of silicates were added to different amount of acid in evaporating dish.Then these silicates were carried out under vigorous stirring in magnetic stirring plates, among them, the curing time is 3−24 h, the curing temperature is …

Chemical Compatibility Database from Cole-Parmer

The information in this chart has been supplied to Cole-Parmer by other reputable sources and is to be used ONLY as a guide in selecting equipment for appropriate chemical compatibility. Before permanent installation, test the equipment with the chemicals and under the specific conditions of your application. Ratings of chemical behavior listed ...

Glacial weathering, sulfide oxidation, and global …

Significance. We compile data showing that, as hypothesized previously, waters draining glaciers have solute chemistry that is distinct from nonglacial rivers and reflects different proportions of mineral …

Silica–sulfuric acid and alumina–sulfuric acid: versatile …

–SO 3 H functionalized silica and alumina have emerged as efficient and eco-compatible heterogeneous solid acid catalysts for the construction of various important molecular skeletons. The advantages of –SO 3 H functionalized silica and alumina from the standpoint of sustainability are attributed to their thermal stability, easy recovery, and efficient …

Kinetics of sulfuric acid leaching of low-grade zinc silicate ore

CN101327931A

1. the clean preparation method of a silica gel, make by sulfuric acid and alkali metal silicate reactant salt, described alkalimetal silicate prepares by sulphate process, it is characterized in that, raw material sulphuric acid is all or part of to be derived from another kind of raw material alkalimetal silicate production process and ...

Silica-sulfuric Acid. | Download Scientific Diagram

Silica-sulfuric Acid. | Download Scientific Diagram. Fig 1 - uploaded by Reza Hosseinpour. Content may be subject to copyright. Silica-sulfuric Acid. Source publication. Silica...

Hydrofluoric Acid

HF by itself is more effective in the digestion of silicate rock minerals than when mixed with another acid. ... The materials used here must therefore be able to resist hot concentrated sulfuric acid as well as hydrofluoric acid and possess adequate erosion resistance to fluorspar and calcium sulfate crystals. Depending on concentration and ...

Sodium Silicate

The silicate compounds that are left over have glass like properties, making a temporary brittle repair [66]. Highly dispersed magnesium silicates can be used as polymer fillers or active adsorbents [67]. Magnesium silicate is an amphoteric compound with a high specific area capable of absorbing either acid or alkali metal catalyst.

Leaching of Willemite Concentrate in Sulfuric Acid Solution …

Despite many researches were reported on sulfuric acid leaching of zinc silicate ores at 293–368 K, work on the high temperature leaching of siliceous zinc ores is scanty. Sulfuric acid leaching of zinc silicate ores having 65.1% hemimorphite and 14.25% smithsonite under pressure was studied [ 15 ], but further study on the high temperature ...

Preparation and characterization of silicagel from silicate …

Abstract The formation of silicagel from sodium silicate solution obtained by alkaline autoclave treatment of copper slag was investigated. The influence of the parameters of the gelation process (type of acid used, the pH of the medium, and drying conditions) on the structure and properties of the resulting silicagel, were studied. …

Sulfuric acid weathering counteracts CO2 drawdown …

Sulfuric acid weathering counteracts CO2 drawdown from silicate weathering in mountainous catchments from southwest China - ScienceDirect. Journal of …

Pressure leaching of synthetic zinc silicate in sulfuric acid …

The study for the effect of sulfuric acid concentration on the extraction of zinc and the dissolution of silica was carried out by varying concentrations in the 80–160 g/L sulfuric acid range.The following leaching conditions were applied: time: 60 min, temperature: 120 °C, and air pressure: 0.6 MPa.The results are shown in Fig. 2, which …

Silica–sulfuric acid and alumina–sulfuric acid: …

This comprehensive review deals with an overview of the utilization of silica–sulfuric acid and alumina–sulfuric acid as heterogeneous supported Brønsted acid catalysts for …

Sulfuric acid leaching of zinc silicate ore under pressure

Subsequently, Bodas (1996) developed a process for leaching zinc silicate ores from Thailand using sulfuric acid as the leachant and Magnafloc 156 as the flocculating agent. He found that 95% zinc extraction was obtained at a 4.5 M sulfuric acid concentration and a liquid–solid (volume/weight) ratio (L/S) of 1:10 g/mL within 3 h …

Minerals | Free Full-Text | Behaviors of Silicon, Aluminum and …

As can be seen from Table 3, the contents of SiO 2, Al 2 O 3 and Fe 2 O 3 in the resulting acid leach residues decreased from 17.24% to 7.69%, 15.52% to 5.73% and 15.26% to 4.32% with 2 mol sulfuric acid for 1 min and 6 mol sulfuric acid for 3 min, respectively, while the contents of BaO and SO 3 increased

Silica-Based Solid Acid Catalyst with Different

Silica-based solid acid catalysts have been successfully prepared and characterized. This research aimed to study the effect of sulfuric acid and calcination temperature on the properties of silica-based solid acid catalyst chemically and physically. The catalyst was synthesized with tetraethyl ortho silicate (TEOS) as precursor of SiO2 …

Recovery of scandium from silicate minerals by high …

High-pressure leaching (HPL) with concentrated sulfuric acid (98 wt%) and NaF was used for the treatment of silicate ore containing Sc of 1.03 × 10 −4 wt%.. The Sc leaching efficiency of 91.82% was obtained under the optimal conditions, which are pressure of 5.0 × 10 5 Pa, A/O value of 1.1, L/S value of 1.8, NaF dosage of 2 wt%, at 130 °C for 6 h.

Chemical Processing

Sulfuric acid is typically used in the production of various chemicals, such as phenol and acetone. It is necessary, however, to remove traces of sulfuric acid prior to downstream distillation units. ... For the synthesis of silica sols from sodium silicate, either weak acid or strong acid cation DuPont™ AmberSep™ ion exchange resins are used.

Silica Sulfuric Acid: An Eco-Friendly and Reusable …

Silica sulfuric acid (SiO 2-OSO 3 H) as an eco-friendly, readily available, and reusable catalyst is applied to benzimidazole derivatives synthesis under …

Glacial weathering, sulfide oxidation, and global carbon cycle

Carbonate weathering by sulfuric acid (0:0.5 ratio) will release CO 2 over tens of million years until sulfate is reduced in marine sediments, returning alkalinity ... (sulfide and CO 2 dissolution) with acid-consuming reactions (silicate and carbonate dissolution) (Fig. 3A). We use the proportions of solutes from carbonate, silicate, and ...