Check patentability & draft patents in minutes with Patsnap Eureka AI!

A method for efficient impurity removal by hydrochloric acid wet-process phosphoric acid

A technology of wet-process phosphoric acid and hydrochloric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high defluorination cost and low impurity removal efficiency, and achieve excellent defluorination effect, easy filtration, and reduced Effect of major impurity content

Active Publication Date: 2021-02-05
EAST CHINA UNIV OF SCI & TECH
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the technical deficiencies of high defluorination cost and low impurity removal efficiency of wet-process phosphoric acid at the present stage, and provides a method for efficient impurity removal of hydrochloric acid wet-process phosphoric acid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for efficient impurity removal by hydrochloric acid wet-process phosphoric acid
  • A method for efficient impurity removal by hydrochloric acid wet-process phosphoric acid
  • A method for efficient impurity removal by hydrochloric acid wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic Ⅴ (40% HF1.84g), inorganic Ⅱ (aluminum sulfate octahydrate 2.66g), inorganic Ⅲ (silica 0.32g), and inorganic Ⅳ (98% concentrated sulfuric acid 0.88g) is placed in a beaker containing 166.19g distilled water, after it is dissolved, add inorganic substance I (calcium oxide 7.0g), control the reaction temperature to 30℃, the stirring rate is 160r / min, the reaction After 12h, filter, wash and dry the precipitate to obtain 0.33g of white precipitate. The F, CaO, Al in the wet-process phosphoric acid after the reaction2O3And SiO2The removal rates of sulphate were 14.99%, 8.28%, 13.62%, 6.87%.

Embodiment 2

[0053]Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic Ⅴ (40% HF1.84g), inorganic Ⅱ (aluminum sulfate octahydrate 2.66g), inorganic Ⅲ (silica 0.32g), and inorganic Ⅳ (98% concentrated sulfuric acid 0.88g) is placed in a beaker containing 163.19g distilled water, after it is dissolved, add inorganic substance I (calcium oxide 10.0g), control the reaction temperature to 30℃, the stirring rate is 160r / min, and the reaction After 12h, filter, wash and dry the precipitate to obtain 0.68g of white precipitate. The F, CaO, Al in the wet-process phosphoric acid after the reaction2O3And SiO2The removal rates were 29.98%, 11.82%, 19.45%, 9.81%.

Embodiment 3

[0055]Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic Ⅴ (40% HF1.84g), inorganic Ⅱ (aluminum sulfate octahydrate 2.66g), inorganic Ⅲ (silica 0.32g), and inorganic Ⅳ (98% concentrated sulfuric acid 0.88g) is placed in a beaker containing 155.51g distilled water, after it is dissolved, add inorganic substance I (calcium oxide 17.68g), control the reaction temperature to 30℃, the stirring rate is 160r / min, the reaction After 12h, filter, wash and dry the precipitate to obtain 1.35g of white precipitate. F, CaO, Al in the wet-process phosphoric acid after the reaction2O3And SiO2The removal rates of sulphate were 61.64%, 4.16%, 55.79%, 28.13%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a high-efficiency impurity removal method for hydrochloric acid wet-process phosphoric acid. One of calcium-containing inorganic substances, aluminum-containing inorganic substances, silicon-containing inorganic substances, sulfur-containing inorganic substances or fluorine-containing inorganic substances is added to the hydrochloric acid wet-process phosphoric acid. One or several kinds, adjust the mol ratio of Ca, Al, Si, S, F in hydrochloric acid method wet-process phosphoric acid to be (20‑50): (0.8‑1.2): (1‑1.20): (0.90‑1.20): ( 12-15), react, make Ca, Al, Si, S, F impurity elements in the hydrochloric acid method wet-process phosphoric acid with Ca 4 AlSiSO 4 F 13 ·12H 2 The form of O is precipitated, so as to achieve the purpose of purification. Compared with the prior art, the present invention removes five kinds of impurity elements in wet-process phosphoric acid at one time by changing the composition of wet-process phosphoric acid, so that the main impurity elements in wet-process phosphoric acid are compound Ca 4 AlSiSO 4 F 13 ·12H 2 The form of O is precipitated, so as to achieve the purpose of wet phosphoric acid purification.

Description

Technical field[0001]The invention belongs to the technical field of wet-process phosphoric acid treatment, and in particular relates to a method for efficiently removing impurities from hydrochloric acid-process wet-process phosphoric acid.Background technique[0002]The purification technology of wet-process phosphoric acid currently mainly includes ion exchange, electrodialysis, crystallization, membrane separation, chemical precipitation, solvent precipitation, solvent extraction and chemical precipitation combined processes. But the most widely used and most economical in production is the chemical precipitation method, that is, the two-stage neutralization method. Calcium, fluorine, aluminum, magnesium, silicon and sulfur are the main impurities in wet-process phosphoric acid. The two-stage neutralization method can effectively purify, the process is also mature and the quality is stable, but the disadvantage is the P in phosphoric acid2O5The utilization rate is not high, and so...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/237C01B25/238
Inventor 武斌黄飞舟陈葵马强何丰
Owner EAST CHINA UNIV OF SCI & TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com