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1.发明授权
公开(公告)号：US5766339A
公开(公告)日：1998-06-16
申请号：US852798
申请日：1997-05-07
CPC分类号： C04B7/24 , C01B17/0491 , C01B17/506 , C04B7/04 , Y02P20/129 , Y02P40/145
摘要： Cement is produced by forming a moist mixture of a flue gas desulfurization process waste product containing 80-95 percent by weight calcium sulfite hemihydrate and 5-20 percent by weight calcium sulfate hemihydrate, aluminum, iron, silica and carbon, agglomerating the moist mixture while drying the same to form a feedstock, and calcining the dry agglomerated feedstock in a rotary kiln. Sulfur dioxide released from the calcium sulfite hemihydrate and calcium sulfate hemihydrate during calcination may be used to produce sulfuric acid, while heat recovered in the process is used to dry the agglomerating feedstock.
摘要翻译： 通过形成含有80-95重量％亚硫酸钙半水合物和5-20重量％硫酸钙半水合物，铝，铁，二氧化硅和碳的烟道气脱硫工艺废物的湿混合物来生产水泥，使潮湿混合物凝聚，同时 将其干燥以形成原料，并将干燥的团聚原料煅烧在回转窑中。 煅烧过程中从亚硫酸钙半水合物和半水合硫酸钙中释出的二氧化硫可用于生产硫酸，而本方法回收的热量则用于干燥附聚原料。
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公开(公告)号：US5645807A
公开(公告)日：1997-07-08
申请号：US446959
申请日：1995-05-24
CPC分类号： C01F11/464 , B01D53/501 , B01D53/502 , C01F5/22
摘要： A wet scrubbing method for removal of sulfur dioxide from a gaseous stream uses a magnesium-enhanced lime scrubbing aqueous slurry, where a solids content in the aqueous slurry in a wet scrubbing unit is maintained at an amount of between 13 to 20 percent by weight. A bleed stream is removed from the aqueous scrubbing slurry at a pH of between 4.5-5.6 and fed to an oxidizing unit wherein calcium sulfite is oxidized to gypsum. The gypsum and residual solids in the discharge from the oxidizing unit are separated to produce a clarified solution, which is returned to the wet scrubbing unit.
摘要翻译： 用于从气流中除去二氧化硫的湿式洗涤方法使用镁增强的石灰洗涤含水浆料，其中在湿式洗涤单元中的含水浆料中的固体含量保持在13至20重量％之间的量。 在4.5-5.6的pH值下，从含水洗涤浆液中除去排出物流，并将其送入其中亚硫酸钙被氧化成石膏的氧化单元。 将来自氧化单元的排出物中的石膏和残余固体分离以产生澄清溶液，该溶液返回到湿式洗涤单元。
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