The leaching rate can be more than 85% after its leaching at 60℃ for 15 min, when the concentration of sodium carbonate decreases to 30 g/L. Sodium hydroxide in the solution benefits the ...Web
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The concentration of carbonate ions in the pregnant solution is revealed as a key factor in controlling the nature of the precipitating phase. Synthetic aluminate …Web
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DE19784C DENDAT19784D DE19784DA DE19784C DE 19784 C DE19784 C DE 19784C DE NDAT19784 D DENDAT19784 D DE NDAT19784D DE 19784D A DE19784D A DE 19784DA DE 19784 C DE19784 C DE 19784C Authority DE Germany Prior art keywords solution aluminate soda carbonate potassium Prior art date Legal status (The legal …Web
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Synthetic aluminate solutions of varying sodium carbonate concentrations, ranging from 20 to 160 g/L, were carbonated, and the resulting precipitating phases were characterized by X-ray ...Web
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Semantic Scholar extracted view of "Na-dawsonite derived aluminates for DMC production by transesterification of ethylene carbonate" by G. Stoica et al. ... Mixed solvent reactive recrystallization of trona (sodium sesqui-carbonate) into soda (sodium carbonate anhydrate) R. Gärtner G. Witkamp. Materials Science, Chemistry. 2007; 17.Web
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Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate Download PDF. Download PDF. Published: 15 January 2022 ... C. Li, A.F. Reid, and S. Saunders, Nonstoichiometric alkali ferrites and aluminates in the systems NaFeO 2-TiO 2, KFeO 2-TiO 2, KAlO 2-TiO 2, and KAlO 2-SiO 2, J. Solid State Chem., …Web
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PDF | Experimental work has been performed to investigate the precipitation mechanism of aluminum hydroxide phases from sodium aluminate/sodium... | Find, read and cite all the research you...Web
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Fusion of Silicates, Aluminates, Titanium oxide, Bauxites, Phosphates, Fluorides, Carbides, Silicon, Sulfides, ... Sodium peroxide is very reactive: Na 2 O 2 – Na 2 CO 3-1:15: By adding 1g of sodium carbonate to 5 or 8g of sodium peroxide, violent reactions are …Web
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Sodium carbonate has quite high solubility even in strong Bayer liquors, and unless at higher concentrations, supersaturation by evaporation is required for its precipitation. ... Because aluminate is available to form less soluble calcium aluminates, the efficient precipitation of calcium carbonate by slaked lime addition requires optimum ...Web
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The sodium carbonate roasting of chromite ores is a commercial process of chromium chemical production reported by ... i.e. < 1:5, the dissolution has been found to be less effective. Roasting of sample also generates soluble aluminates and silicates which pose hinderance to effective dissolution of sodium chromtae from the roasted mass ...Web
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IQE produces sodium aluminates in solution, in the form of a transparent liquid, within the ALNA series. ... NaAlO2, white solid, (1) by reaction of aluminum hydroxide and NaOH solution, (2) by fusion of aluminum oxide and sodium carbonate, the solution reacts with CO2 to form aluminum hydroxide. Sodium aluminate will dissolve in water and ...Web
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In addition, sodium carbonate sample used in this study is an analytical-grade reagent purchased from Sinopharm Chemical Reagent Co., Ltd., China. Table 1. Chemical compositions of the as-received mullite sample. ... (SiO 4-SiO 4), sodium aluminates (AlO 4-AlO 4) and sodium aluminosilicates (AlO 4-SiO 4) [20], [21], [38].Web
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Sodium carbonate at the dosage of 1% increased the early age strength and did not have obvious negative effect on the later strength development of cement pastes [12]. ... Won et al. [7] found that shotcretes with calcium or sodium aluminates exhibited higher alkali-aggregate expansion at 14 and 84 d, especially for sodium aluminate …Web
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Dependence of Al 2 O 3 pore volume on the concentration of the sodium aluminate solution. Na 2 O-to-Al 2 O 3 ratios, M, were 1.50, 1.67, and 2.0 for samples 1, 2, and 3, respectivelyWeb
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It is postulated that similar to calcium nitrate, limestone and sodium carbonate, due to their ability to provision CO 3 2− ions and the potential to stabilize the CO 3-AFm compounds (i.e., monocarboaluminate, Mc, and hemicarboaluminate, Hc, as shown in Eqs. 4–6), should also be able to prevent conversion [8, 23].Based on this concept, …Web
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The sodium aluminate solution used in this study was synthesized by dissolving NaAlO 2, NaOH, and Na 2 SiO 3 ·9H 2 O (Sinopharm Chemical Reagent Co. …Web
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1. Introduction Given that RO scaling involves precipitation–dissolution (condensation–hydrolysis) reactions of dissolved silica species, metals and inorganic constituents in water, 29 Si NMR spectroscopy was used to …Web
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The transesterification of ethylene carbonate with methanol to dimethyl carbonate, an alternative phosgene-free route to DMC, was investigated over aluminas …Web
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tion of homogenized mixtures of the calcium aluminates (C 3A, C 12A 7, CA) with a pre-determined amount of sodium oxide added in the form of sodium carbonate Na 2CO 3. Each sample was homogenized in an agate mill and then calcinated for 10 to 20 h. Af-ter the calcination, the sodium content in the samples was determined by atomic ab-sorption ...Web
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Sodium bicarbonate aqueous solution was prepared by the dissolution of the sodium bicarbonate in. Titration curves. The titration of the supersaturated sodium aluminate solution by sodium bicarbonate aqueous solution at the rate of 1 mL/min was carried out (Expt.1 in Table 1). The titration curve (pH vs V NaHCO3) at 70 °C is shown …Web
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iv) Sodium bicarbonate 2) Mild antiseptic. b) The raw materials for the manufacture of cement are limestone and clay. When clay and lime are. strongly heated together they fuse and react to form 'cement clinker'. This clinker is mixed with. 2-3% by weight of gypsum (CaSO4·2H2O) to form cement. 10.Web
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The effects of leaching time, leaching temperature, liquid-to-solid ratio and concentrations of sodium carbonate and sodium hydroxide in solution on the leaching rate of Na4Ca3(AlO2)10 were examined.Web
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At 973 K, sodium carbonate is completely decomposed, and another NaAlO 2 phase ... Basic aluminas (aluminates) derived by thermal decomposition of Na-dawsonites are active, selective and stable catalysts for the transesterification of ethylene carbonate with methanol. The adequate selection of the activation conditions of the …Web
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Sodium carbonate, often known as washing soda, undergoes a breakdown reaction, it is more heat-stable than sodium bicarbonate. The reaction's balanced equation is: Na2CO3 Na2O (s) + CO2 (g) At ambient temperature, the breakdown of anhydrous sodium carbonate into sodium oxide and carbon dioxide is gradual and completes at 851 …Web
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12.4.5.3 Adsorption on calcium aluminates. Using advanced NMR techniques, ... Ground water containing sulfates of sodium, ... Calcium carbonate (CaCO 3) has three polymorphic forms, these being calcite, aragonite, and vaterite. Calcite, the most stable, is the ultimate form found in carbonated concrete. In terms of optical properties, calcite ...Web
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Aluminium extraction from a calcium aluminate slag using sodium carbonate based on the critical examination of the patented industrial Pedersen process - …Web
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Calcium aluminates are more difficult to dissolve than gibbsite or boehmite and as a consequence the aluminum recoveries at 200 g/l NaOH are below 50 %. ... As shown in Fig. 8, the sodium carbonate addition was raised from 16 up to 80 % and demonstrates that the highest aluminum recovery of 88 % cannot be reached below this …Web
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Indeed, the presence of silicates and aluminates is crucial for the synthesis of clinker phases. 3.4. Effect of Impurities: Combined Effects ... This technol. will enable industrial symbiosis by combining the high-temp. lime and sodium carbonate manufg. processes into a single low-temp. process and greatly reduce the chem. (raw material) CO2 ...Web
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Sodium aluminate, whose formula is NaAlO 2, is an inorganic, ionic compound where sodium is a cation and the aluminate is an anion. Aluminate is made up of aluminum attached to two oxygen atoms ...Web
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The group of A 2 BX 4 materials, in which A and B are metallic elements and X is a chalcogen (O, S, Se, Te), has attracted much attention because it offers a versatile range of relevant physical and chemical properties [1, 2].The nickel aluminate NiAl 2 O 4 is an inverse spinel, half of its aluminium ions preferentially fill the tetrahedral sites, and the …Web
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Sodium silicates; Sodium aluminates; Admixtures and fillers; Download chapter PDF ... However, sodium carbonate can react with calcium hydroxide to form sodium hydroxide in solution. Provis (2009) gives a comprehensive overview of alkali hydroxide solutions. There is a significant increase in solution viscosity of all alkali metal …Web
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Dolomitic limestones can be used but only the calcium carbonate portion of the rock is reactive. Potassium carbonate is reactive and can replace soda ash; therefore, it is expected that credit can more » be taken for both Na/sub 2/O and K/sub 2/O contained in fly ashes, limestones, kiln dusts, etc., to decrease the amount of soda ash which ...Web
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