Title:
METHOD FOR PRODUCING CALCIUM PHOSPHATE SALT AND HIGH-PURITY GYPSUM BY USING HYDROCHLORIC ACID AND PHOSPHATE ROCK
Document Type and Number:
WIPO Patent Application WO/2019/100499
Kind Code:
A1
Abstract:
A method for producing calcium phosphate salt and high-purity gypsum by using hydrochloric acid and phosphate rock, comprising the following steps: incompletely decomposing phosphate rock by using hydrochloric acid, and performing solid-liquid separation to obtain a solid 1 and a liquid 1; A, processing the solid 1: reacting the solid 1 with hydrochloric acid, and then filtering and separating to obtain filter residue and a filtrate 2; adding sulfuric acid to the filtrate 2, heating a filtered filtrate 3 for dechlorination, defluorination and dehydration to obtain calcium dihydrogen phosphate; B, processing the liquid 1: ① removing fluorine from the liquid 1; ② adding calcium to obtain calcium hydrogen phosphate; ③ removing magnesium; ④ adding sulfuric acid to obtain high-purity gypsum. The steps of the method are simple and costs are low, while the prepared calcium phosphate salt meets standards, and the obtained gypsum is good quality.
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Inventors:
LI JIN (CN)
WANG JIACAI (CN)
ZOU JIAN (CN)
WU SHENGPING (CN)
HOU JUN (CN)
HUANG HENG (CN)
ZHANG XIYANG (CN)
ZHANG PING (CN)
WANG JIACAI (CN)
ZOU JIAN (CN)
WU SHENGPING (CN)
HOU JUN (CN)
HUANG HENG (CN)
ZHANG XIYANG (CN)
ZHANG PING (CN)
Application Number:
PCT/CN2017/117517
Publication Date:
May 31, 2019
Filing Date:
December 20, 2017
Export Citation:
Assignee:
CHANHEN ECO TECH CO LTD (CN)
International Classes:
C01B25/32; C01F11/46
Foreign References:
| CN106044732A | 2016-10-26 | |||
| CN102583290A | 2012-07-18 | |||
| US3652206A | 1972-03-28 | |||
| CN107043956A | 2017-08-15 | |||
| US7687046B2 | 2010-03-30 |
Attorney, Agent or Firm:
CHENGDU HONGQIAO PATENT LAW OFFICE (CN)
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