The crystalline phases of the carbonated desulfurization residue were calcite and vaterite with spherical and granular morphology CO 2 /O 2 /N 2 mixed gas was also used as the simulated desulfurization fuel gas in the carbonation reaction and it had a relatively minor effect on the carbonation ratio However it slowed the carbonation reaction
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— The uptake of Cd II by waste calcite a by product of the carbonation of flue gas desulfurization FGD gypsum was investigated in a batch experiment The uptake of Cd II by and the dissolution of Ca II from the waste calcite particles were monitored simultaneously as a function of exposure time to mM Cd II solution
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— Calcite was the dominating phase produced in the two step carbonation while the direct carbonation produced a mixture of vaterite and calcite phases under all conditions The relative amounts of each phase were determined by comparing their X ray diffraction peak intensities Flue gas desulfurization FGD gypsum is the main product
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Similar spherical calcite crystals were observed under the condition of Na V UB with a lower crystal size below 50 nm Some hollow calcite crystals with a size of 400 nm were observed under the condition of K V UB A mixture of spherical and cubic crystals started to form on the rod like crystal particles exp code NH C UB
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— Effect of impure components in flue gas desulfurization FGD gypsum on the generation of polymorph CaCO 3 during carbonation reaction Author links open overlay panel Bo Wang Zihe Pan Calcite CaCO 3 was the carbonation product produced during CS carbonation under varying conditions The morphology of calcite was changed from
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— Semantic Scholar extracted view of "A novel method for desulfurization and purification of fluorite concentrate using acid leaching and reverse flotation of sulfide" by Hang Liu et al It is challenging to separate fluorite from calcite due to their same calcium activated sites on their surfaces The copolymer of maleic and acylic acid
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Fluorite one of the major raw materials for fluoride in China is mainly associated with sulfide and calcite minerals The presence of these sulfide and calcite minerals cause the pipe blockage and efficiency loss during the production of anhydrous hydrofluoric acid AHF Worldwide direct flotation techniques are utilized to beneficiate the fluorite into the
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This study aimed to investigate the effect of ultrasonic application on the production of precipitated calcium carbonate PCC particles from desulfurization gypsum via direct mineral carbonation method using conventional and venturi tube reactors in the presence of different alkali sources NaOH KOH and NH 4 OH The venturi tube was designed to
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— Introduction Sulfur combinations present in fuel lead to sulfur dioxide and sulfate particulate generation and they are a major source of environmental pollutions 1 reduction of CO and NO x are intended in the automobile catalytic guards organic sulfur compounds can reduce efficiently by poisoning of the catalysts 3 fuel
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— The waste calcite by product of the carbonation reaction of flue gas desulfurization FGD gypsum was evaluated as low cost adsorbent for Cd II removal from wastewater
— Overdependence of energy consumption around fossil fuels is threatening our environment from different anthropogenic emissions of pollutants These pollutants COx NOx and SOx resulting from combustion activities of crude oil and petroleum products are life threatening Desulfurization of fuels is an important matter that
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— Calcite which was the dominant phase when using a stoichiometric amount of ammonia was replaced by vaterite upon the addition of excess ammonia Ethanol tends to induce vaterite and aragonite phases under stoichiometric and excess ammonia conditions respectively Flue gas desulfurization FGD gypsum is produced by the
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— 1 Introduction Limestone/gypsum wet desulfurization technique has been widely used to remove sulfur oxides from flue gas or other industrial waste gas due to its high desulfurization efficiency and stability [1] It is reported that huge amount of FGD gypsum has generated worldwide especially in China 80 Mt 2017 and USA 30 Mt 2015
— Fluorite one of the major raw materials for fluoride in China is mainly associated with sulfide and calcite minerals The presence of these sulfide and calcite minerals cause the pipe blockage and efficiency loss during the production of anhydrous hydrofluoric acid AHF Worldwide direct flotation techniques are utilized to beneficiate
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