发明名称 |
METHOD FOR PRODUCING WET-PROCESS PHOSPHORIC ACID AND BY-PRODUCING ALPHA-HEMIHYDRATE GYPSUM AND HIGH-PURITY AND HIGH-WHITENESS ALPHA-HEMIHYDRATE GYPSUM |
摘要 |
Provided is a method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum. The method comprises: adding phosphoric acid and a phosphate rock powder into an extraction tank and conducting an extraction reaction on same, then adding sulfuric acid to continue the reaction so as to make 30%-50% of calcium ions form dihydrate gypsum, the dihydrate gypsum part being sent to a crystal transformation tank, a crystal transformation agent being added, and crystal transformation conditions being controlled so as to obtain 30%-50% of an ordinary alpha-hemihydrate gypsum; and make the other 50%-70% of calcium ions be present in the form of calcium dihydrogen phosphate in a phosphoric acid extractive solution, separating same and then introducing the phosphoric acid extractive solution into a decalcification reaction tank, adding a sulfuric acid solution diluted by a washing solution, and then firstly performing decalcification, and then controlling the crystal transformation conditions and subjecting a solid to a crystal transformation reaction, so as to generate a high-purity and high-whiteness alpha-hemihydrate gypsum. The method not only reduces the content of phosphorus in the by-product alpha-hemihydrate gypsum, but also realizes the industrial production of phosphoric acid and by-products ordinary alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum by a wet-process. |
申请公布号 |
WO2017045519(A1) |
申请公布日期 |
2017.03.23 |
申请号 |
WO2016CN96923 |
申请日期 |
2016.08.26 |
申请人 |
KINGENTA NORSTERRA CHEMICAL CO., LTD. |
发明人 |
HU, Zhaoping;YAO, Hualong;CHEN, Hongkun;PANG, Shihua;LIU, Yongxiu;LI, Chengzhi |
分类号 |
C01B25/231;C01F11/46 |
主分类号 |
C01B25/231 |
代理机构 |
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代理人 |
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