公开(公告)号：US20050100503A1

公开(公告)日：2005-05-12

申请号：US10363435

申请日：2001-05-18

申请人： Yisheng Feng ,  Jiutian Feng ,  Xigang Liu ,  Yurui Wang ,  Tianbao Lu

发明人： Yisheng Feng ,  Jiutian Feng ,  Xigang Liu ,  Yurui Wang ,  Tianbao Lu

IPC分类号： C01B17/50 ,  C01F11/08 ,  F27B7/02 ,  F27B7/20 ,  F27D17/00 ,  C01B17/52 ,  F27B7/00

CPC分类号： C01F11/08 ,  C01B17/506 ,  F27B7/02 ,  F27B7/2025 ,  F27D2017/009 ,  Y02P20/124

摘要： A method of decomposing gypsum to sulfur dioxide, and the apparatus thereof are disclosed. The apparatus comprises a set of four-stage cyclone preheater and a rotary kiln for decomposing and calcining. In the four-stage cyclone preheater, the off-gas of the kiln conducts heat-exchange with materials. By such processing, the efficiency of heat exchange is high, and gypsum which contains 10-25% of water can be directly used for preparing crude materials. The entrance temperature of the preheated materials can be up to 600-720° C., while the temperature of the off-gas can be decreased to 260-400° C., so that heat utilization ratio is high, and the cost of the apparatus can be cut down. The concentration of SO2 in the off-gas may be up to 11-14%, so that two-conversion two-adsorption process can be employed for preparing sulfuric acid.

摘要翻译： 公开了将石膏分解成二氧化硫的方法及其装置。 该装置包括一组四级旋风预热器和用于分解和煅烧的回转窑。 在四级旋风预热器中，窑尾废气与材料进行热交换。 通过这种处理，热交换效率高，含10-25％水的石膏可直接用于制备原料。 预热材料的入口温度可达600-720℃，废气温度可降至260-400℃，热利用率高，成本高 设备可以减少。 废气中的SO 2浓度可以达到11-14％，因此可以采用双转化双吸附法来制备硫酸。

公开(公告)号：US07172742B2

公开(公告)日：2007-02-06

申请号：US10362845

申请日：2001-05-15

申请人： Yisheng Feng ,  Jiutian Feng ,  Xigang Liu ,  Yurui Wang ,  Tianbao Lu

发明人： Yisheng Feng ,  Jiutian Feng ,  Xigang Liu ,  Yurui Wang ,  Tianbao Lu

IPC分类号： C01B25/222 ,  C01B25/231

CPC分类号： C01F11/46 ,  C01B25/231

摘要： The present invention relates to a method of preparing wet process phosphoric acid, which comprises: dividing raw materials which contain phosphate rock slurry and sulfuric acid into two parts, and then feeding these two parts into two reactors separately. In the first reactor, feeding 70–90 wt. % of the total amount of the slurry and sulfuric acid, in which the ratio of phosphate rock slurry to sulfuric acid to recycled phosphoric acid is set to be 1:0.6˜0.8:1.0˜2.5. 10˜30% of the reaction solution directly flows into conversion cell, participating in the conversion reaction of dihydrate gypsum. Thus resulted phosphoric acid concentration is 33˜39 wt. %. The recovery efficiency of P2O5 is 99% or more. When putting coke powders in the conversion solution as filter aid, the filtration efficiency can be improved by 10˜30%, and in so produced hemihydrate gypsum, P2O5 is 0.05˜0.2%, water of hydration is 4˜8%. The product can be used for producing sulfuric acid and cement without baking dry.

摘要翻译： 本发明涉及一种制备湿法磷酸的方法，包括：将含有磷酸盐岩浆和硫酸的原料分成两部分，然后分别将这两部分进料到两个反应器中。 在第一反应器中，加入70-90wt。 磷酸盐岩与硫酸与再生磷酸的比例为1：0.6〜0.8：1.0〜2.5的浆料和硫酸的总量的％。 10〜30％的反应溶液直接流入转化池，参与二水石膏的转化反应。 因此磷酸浓度为33〜39wt。 ％。 P 5 <5的回收效率为99％以上。 当将焦炭粉末作为助滤剂放入转化溶液中时，过滤效率可以提高10〜30％，在这样制造的半水石膏中，P 2 O 5 O 5 0.05〜0.2％，水合水质为4〜8％。 该产品可用于生产硫酸和水泥，无需烘干。