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Method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite
The invention relates to a method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite, and belongs to the technical field of wet-process phosphoric acid production. The technical problem that high-strength alpha semi-hydrated gypsum with excellent performance cannot be obtained while high-concentration phosphoric acid is prepared by an existing wet-process phosphoric acid production process is solved. The invention discloses the method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite. The method comprises the steps: carrying out a reaction on sulfur-phosphorus mixed acid with phosphorite to prepare phosphoric acid and hemihydrate gypsum, filtering to obtain a high-concentration hemihydrate phosphoric acid product and coarse hemihydrate gypsum, recrystallizing the coarse hemihydrate gypsum twice to generate alpha hemihydrate gypsum, and finally filtering, washing and dryingto obtain the alpha-type high-strength gypsum. Decoloration treatment is carried out in the reaction process, and the whiteness of the obtained alpha-type high-strength gypsum is white. The method islow in overall energy consumption and good in economic benefit.
本发明涉及磷矿生产半水磷酸联产α型高强石膏的方法，属于湿法磷酸生产技术领域。本发明解决的技术问题是现有湿法磷酸生产工艺不能在制得高浓度磷酸的同时得到性能优良的高强α半水石膏。本发明公开了磷矿生产半水磷酸联产α型高强石膏的方法，先用硫磷混酸与磷矿反应制得磷酸与半水石膏，过滤后得到高浓度半水磷酸产品和粗半水石膏，粗半水石膏经过两次重结晶生成α半水石膏，最后经过滤、洗涤、烘干得到α型高强石膏。本发明还在反应过程中进行了脱色处理，得到的α型高强石膏白度较白。本发明整体能耗低，经济效益好。
Method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite
The invention relates to a method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite, and belongs to the technical field of wet-process phosphoric acid production. The technical problem that high-strength alpha semi-hydrated gypsum with excellent performance cannot be obtained while high-concentration phosphoric acid is prepared by an existing wet-process phosphoric acid production process is solved. The invention discloses the method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite. The method comprises the steps: carrying out a reaction on sulfur-phosphorus mixed acid with phosphorite to prepare phosphoric acid and hemihydrate gypsum, filtering to obtain a high-concentration hemihydrate phosphoric acid product and coarse hemihydrate gypsum, recrystallizing the coarse hemihydrate gypsum twice to generate alpha hemihydrate gypsum, and finally filtering, washing and dryingto obtain the alpha-type high-strength gypsum. Decoloration treatment is carried out in the reaction process, and the whiteness of the obtained alpha-type high-strength gypsum is white. The method islow in overall energy consumption and good in economic benefit.
本发明涉及磷矿生产半水磷酸联产α型高强石膏的方法，属于湿法磷酸生产技术领域。本发明解决的技术问题是现有湿法磷酸生产工艺不能在制得高浓度磷酸的同时得到性能优良的高强α半水石膏。本发明公开了磷矿生产半水磷酸联产α型高强石膏的方法，先用硫磷混酸与磷矿反应制得磷酸与半水石膏，过滤后得到高浓度半水磷酸产品和粗半水石膏，粗半水石膏经过两次重结晶生成α半水石膏，最后经过滤、洗涤、烘干得到α型高强石膏。本发明还在反应过程中进行了脱色处理，得到的α型高强石膏白度较白。本发明整体能耗低，经济效益好。
Method for producing phosphoric acid hemihydrate and co-producing alpha-type high-strength gypsum from phosphorite
磷矿生产半水磷酸联产α型高强石膏的方法
CAO JIANXIN (author) / WANG JIACAI (author) / YANG LIN (author) / ZHU JUN (author) / ZENG CHUNHUA (author) / LI JIANQIU (author)
2020-06-30
Patent
Electronic Resource
Chinese
IPC:
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C04B
Kalk
,
LIME
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