— In the desulfurized gypsum Ca OH 2 has been completely consumed and CaSO 3 · 2 O has become the main component with poor water solubility Chen et al 2009 after mixing gold concentrate and lime powder to make bricks they enter the smelting furnace together with limestone and coke as auxiliary materials for intensified
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— Flue gas desulfurized gypsum FGDG is a waste material produced in the power stations during the flue gas desulfurization process In China a small amount of FGDG is used as cement additives or
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The utilization of desulfurized building gypsum as raw material for gypsum based self leveling mortar GSL is limited by its low strength and poor water resistance The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum based sel
The invention relates to the technical field of building materials and discloses a baking free brick based on desulfurized gypsum and building waste which comprises by weight 70 90 parts of dehydrated desulfurized gypsum 5 25 parts of building waste 2 5 parts of modified basalt fiber part of organosilicon waterproofing agent and 15 25 parts of water;
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— In this sense silage SG and flue gas desulfurized gypsum FGDG are two good choices as composting additives SG is made from the roughage obtained by cutting corn sorghum and other forage crops and grass; the roughage is then subjected to anaerobic fermentation by lactic acid bacteria which results in the generation of SG [19]
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The invention discloses a formula and a process for comprehensively recycling desulfurized gypsum wherein the desulfurized gypsum other solid waste materials or natural sandstone materials cement a special coagulant and water are used wherein the mass ratio of the desulfurized gypsum is 70% the mass ratio of the other solid waste materials or natural
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The invention relates to the technical field of building materials and discloses a baking free brick based on desulfurized gypsum and building waste which comprises by weight 70 90 parts of dehydrated desulfurized gypsum 5 25 parts of building waste 2 5 parts of modified basalt fiber part of organosilicon waterproofing agent and 15 25 parts of water;
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— The massive accumulation of industrial solid wastes such as circulating fluidized bed fly ash CFA silicon calcium slag SCS and desulfurization gypsum FGD occupy land resources and bring varying degrees of pollution to soil water and atmosphere Unburned brick is a new construction material prepared from industrial waste residues
— The raw materials for preparation of CSWs in these studies were predominantly derived from natural gypsum desulfurized gypsum and industrial waste liquid However due to the different desulfurization processes semi dry FGD ash FGDA cannot be used directly as a resource because it contains a large amount of CaSO 3
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— the limestone gypsum flue gas desulfurization process ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3] A 300 MW coal fired thermal power unit discharges about 30 000 ton of desulfurized gypsum every year assuming % sulfur in coal [4] A substantial amount of desulfurized gypsum is
— From the experiment it was found that the highest compressive strength of concrete brick specimens was MPa which was produced from % gypsum without CDW and OPT while MPa was the
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— A study of fly ash lime granule unfired brick Powder Technol 2008 T Cicek et al Lime based steam autoclaved fly ash bricks Constr Build Mater 2007 The controlled synthesis of α hemihydrate α HH gypsum using flue gas desulfurized gypsum is essential for the utilization of calcium and sulfur resources An aspect ratio AR
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— 1 Introduction At present industrial solid wastes in the world are characterized by high output many kinds large differences in physical and chemical properties and uneven regional distribution [1] [2] [3] Typical industrial solid wastes are classified as alkaline solid wastes RM carbide slag and alkaline slag etc sulfate solid
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— The semi hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board wallboard [107] The modified treatment of desulfurized gypsum with cement inorganic waste straw fiber and other wastes can be used to manufacture high insulation and compression resistant wall materials [108]
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The invention discloses a novel calcination free desulfurized gypsum brick belonging to the production field of building bricks The calcination free desulfurized gypsum brick comprises the following components in parts by weight 45 55 parts of desulfurized gypsum 25 35 parts of coal ash 5 10 parts of No cement 4 10 parts of triethanolamine 3 5 parts
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