Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process

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United States of America Patent

PATENT NO 10745278
APP PUB NO 20180257938A1
SERIAL NO

15760851

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Abstract

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Provided is a method for producing phosphoric acid and at the same time obtaining alpha-hemihydrate gypsum including: adding a phosphate rock powder and a part of dilute sulfuric acid into an extraction tank, carrying out an extraction reaction on same, separating a clear liquid from the obtained mixed slurry, sending the clear liquid, as a finished product phosphoric acid, into an acid storeroom, and transferring a separated solid, together with the rest mixed slurry, into a crystal transformation tank; and adding sulfuric acid and a crystal transformation agent into the crystal transformation tank, carrying out a crystal transformation reaction for 1.5-7.5 h at 60° C.-130° C., and solid-liquid separating the obtained mixed acid slurry, wherein the solid can be dried into a gypsum powder, or may be not subjected to a drying step and made into gypsum products such as gypsum boards, gypsum building blocks and gypsum members by directly adding water.

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Patent Owner(s)

Patent OwnerAddress
KINGENTA NORSTERRA CHEMICAL CO LTDINDUSTRIAL PARK WENG' AN COUNTY QIANNAN BUYI AND MIAO AUTONOMOUS PREFECTURE GUIZHOU 550400
KINGENTA ECOLOGICAL ENGINEERING GROUP CO LTD276700 XINGDA WEST STREET LINSHU COUNTY LINYI CITY SHANDONG PROVINCE NO 19 LINYI CITY SHANDONG PROVINCE 276700

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Hongkun Shandong, CN 5 18
Hu, Zhaoping Shandong, CN 3 0
Li, Chengzhi Shandong, CN 13 44
Liu, Yongxiu Shandong, CN 5 4
Yao, Hualong Shandong, CN 2 0
Zhang, Xixing Shandong, CN 1 0

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