##tihuan2##The mechanism of calcium carbonate (CaCO 3) formation has been of interest for many decades.This is not only due to its relevance in biomineralization processes 1,2,3, geological phenomena or ...
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##tihuan2##Calcium sulfate occurs in nature in form of three different minerals distinguished by the degree of hydration: gypsum (CaSO4·2H2O), hemihydrate (CaSO4·0.5H2O) and anhydrite (CaSO4).
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##tihuan2##The joint research team began with the premise they could obtain synthetic gypsum from calcium carbonate and sulphuric acid – with the required crystal parameters – after reviewing existing literature on …
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##tihuan2##The objectives of the work were: (i) obtaining gypsum from coagulation sediments of surface water treatment and waste sulfuric acid formed in the production of synthetic fibers; (ii) obtaining high-quality binders from the synthesized gypsum; (iii) suggest alternative directions for the final utilization of filtrate, (iv) conduct an ...
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##tihuan2##Note: To be honest, at this level you might come across calcium hydrogencarbonate being formed in the lime water reaction, and you might come across sodium hydrogencarbonate being used to test for an acid.If you add solid sodium hydrogencarbonate to a liquid and get carbon dioxide given off, then the liquid must be acidic. You might also come across …
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##tihuan2##Mineral carbonation converts waste gypsum into calcium carbonate (CaCO3), which can be recycled during desulfurization. Furthermore, ammonium sulfate ((NH4)2SO4), which is used as a …
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##tihuan2##Calcium carbonate is not soluble in water and exists as white precipitate in the water. When aqueous hydrochloric acid is added, you can observe air bubbles are generated and calcium chloride, carbon dioxide and water are formed. Calcium chloride (CaCl 2) is soluble in water and colorless. So, it exists as an aqueous solution.
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##tihuan2##a) Natural plasters . Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. Gypsum is used in a wide variety of …
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##tihuan2##Containment of sulfate in leachate as gypsum (CaSO 4 ·2H 2 O) mineral formation in bio-cemented sand via enzyme-induced carbonate precipitation
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##tihuan2##Citric acid gypsum (CAG), a by-product from citric acid production processes, rich in calcium sulfate dihydrate, emerged during the reaction of precipitated calcium citrate with sulfuric acid in the calcium salt method. Considering the craftsmanship involved, the productivity of 1 ton of citric acid yielded about 1.34 tons of …
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##tihuan2##To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the industrial by-product gypsum has received substantial attention as a viable method for resource utilization. Currently, the primary problems in …
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##tihuan2##Scientists have created synthetic gypsum using waste sulphuric acid and limestone that they say could replace natural gypsum in construction. ... The joint research team began with the premise they …
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##tihuan2##Industrial byproduct gypsum (BPG) is a secondary product that is mainly composed of calcium sulfate discharged during industrial production. BPG primarily consists of desulfurized gypsum, phosphogypsum, and titanium gypsum, which account for 88% of the total BPG in China. The large-scale utilization of these three types of solid …
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##tihuan2##This work develops a new class of salt solution method to prepare alpha-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) gypsum in trace K 2 SO 4-contained 4.0 M Ca(NO 3) 2 aqueous solution at 95 °C under atmospheric pressure. The driving force for the phase transition is provided by the concentrated Ca(NO 3) 2 …
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##tihuan2##Our study shows that a promising sustainable and cheap source of gypsum-containing raw materials is synthetic gypsum, obtained by reacting a suspension of …
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##tihuan2##Reacting CO 2 from flue gas with calcium from the industrial by-product gypsum (CaSO 4) produces calcium carbonate more economically than the traditional …
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##tihuan2##Keywords: calcite, reactivity, semi-batch, experiment, gypsum, sulfuric acid, industrial waste. 1. INTRODUCTION . Gypsum is a mineral compound of first importance in the formulation of a wide range of building materials. To make up for the long term depletion of its natural resources, building material industry head more and more toward gypsum by-
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##tihuan2##The migration of calcium and sulfate in the pore solution formed gypsum and calcite. The consistent interaction of CO 2 reacts with gypsum and converted to calcium carbonates [85]. The suppression ...
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##tihuan2##Klepetsanis et al. studied the spontaneous precipitation of gypsum at moderate supersaturations with conductometric measurements, sustaining the ionic …
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##tihuan2##Lithium slag is industrial by-product of the extraction of lithium carbonate industry, which is produced by high temperature roasting of spodumene and sulfuric acid [1], [2], [3].For each tonne of lithium carbonate, 8 to 10 tonnes of lithium slag will be discharged [4], [5].Xinjiang and Sichuan in China are the most major lithium salt …
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##tihuan2##sulfuric acid entering the reactor is 1:1 in kilograms. The residence time in the reactor was 10 minutes (US Patents 6,613,141 B2). 2.1.2 Reaction Mechanism The reaction mechanism for the formation of gypsum from limestone and sulfuric acid. Reaction formation of calcium sulfate dehydrate: CaCO 3 (s) + H 2 SO 4 (l) + H 2 O (l) CaSO 4.2H 2 O (s ...
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##tihuan2##The influence of gypsum additive on the formation of calcium silicate hydrates and on the formation of a sequence of intermediary compounds in the CaO–SiO2·nH2O–H2O system has been examined. ... Keywords: calcite, reactivity, semi-batch, experiment, gypsum, sulfuric acid, industrial waste. ... The pH of a slurry made of water and solid in ...
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##tihuan2##To address this concern, numerous researchers have proposed replacing cement with cementitious material, reducing the demand on cement. One method to …
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##tihuan2##Acids in the rain react with the calcium compounds in the stones to create gypsum (hydrated calcium sulphate). ... hydrochloric acid reacts with calcium hydroxide . (b) calcium hydroxide reacts with sulphuric acid. View Solution. Q5. Inorganic oxides of sulphur, nitrogen, etc. react with water vapour in the atmosphere to form weak inorganic ...
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##tihuan2##Data analysis revealed that an appropriate amount of BPG can enhance the mechanical properties of cementitious materials, with compressive strength increasing …
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##tihuan2##DOI: 10.1016/j.jcrysgro.2021.126360 Corpus ID: 241731164; Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid @article{Chen2021PreparationOH, title={Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid}, …
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##tihuan2##industrial formation of gypsum from … . industrial formation of gypsum from sulphuric acid calcium carbonte and water. ... per day of waste gypsum as sulphuric acid ...
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##tihuan2##To this end a reactive crystallization process involving stage-wise reaction of concentrated calcium chloride solution (up to 5 mol/L) with concentrated sulfuric acid (up to 18 mol/L) at ...
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##tihuan2##The CaSO 4 and CaO derived from the partial decomposition of industrial by-product gypsum are used to form calcium sulfoaluminate clinker minerals, and the SO 2 released during the production of calcium sulfoaluminate clinker is collected and transformed into sulfuric acid. The experimental results show that calcium …
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