Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Extraction method for preparing high-quality phosphoric acid from hydrochloric-acid-process wet-process phosphoric acid

A wet-process phosphoric acid, high-quality technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of large equipment investment, low yield, large equipment occupation, etc., achieve short construction time, increase income The effect of high efficiency and less land occupation

Inactive Publication Date: 2019-04-05
SHANDONG LUBEI ENTERPRISE GROUP
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned problems of low yield, large equipment investment, large equipment occupation, and difficulty in extracting phosphoric acid by hydrochloric acid method, the present invention provides an extraction method for preparing high-quality phosphoric acid by hydrochloric acid wet-process phosphoric acid, aiming at improving the refining and extraction of wet-process phosphoric acid. The yield of phosphoric acid in the process can reach more than 99% when extracting phosphoric acid by this method, and the extraction time is shortened by 80-90% compared with the existing extraction process

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
  • Extraction method for preparing high-quality phosphoric acid from hydrochloric-acid-process wet-process phosphoric acid
  • Extraction method for preparing high-quality phosphoric acid from hydrochloric-acid-process wet-process phosphoric acid
  • Extraction method for preparing high-quality phosphoric acid from hydrochloric-acid-process wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Take a 6-stage extraction centrifuge as an example.

[0031] An extraction method for preparing high-quality phosphoric acid by hydrochloric acid wet-process phosphoric acid, the steps of which are:

[0032] (1) Acid leaching: Phosphate rock powder and industrial by-product hydrochloric acid with a concentration of 20-24wt% after preparation are fully reacted in the reaction tank to obtain phosphoric acid slurry; the excess hydrochloric acid is 5% (calculated as calcium oxide in phosphate rock);

[0033] (2) Press filtration and washing: the phosphoric acid slurry is filtered and washed by a filter press to obtain the filtrate, that is, crude phosphoric acid, and the washing solution is returned to the acid leaching section to prepare hydrochloric acid, and the filter cake is treated in a centralized manner;

[0034] (3) Pre-extraction iron removal: crude phosphoric acid is extracted with an organic extractant to remove iron, and the obtained iron-removed ...

Embodiment 2

[0041] Embodiment 2: Take an 8-stage extraction centrifuge as an example.

[0042] (1) Acid leaching: Phosphate rock powder and industrial by-product hydrochloric acid with a concentration of 20-24wt% after preparation are fully reacted in the reaction tank to obtain phosphoric acid slurry; the excess hydrochloric acid is 5% (calculated as calcium oxide in phosphate rock);

[0043] (2) Press filtration and washing: the phosphoric acid slurry is filtered and washed by a filter press to obtain the filtrate, that is, crude phosphoric acid, and the washing solution is returned to the acid leaching section to prepare hydrochloric acid, and the filter cake is treated in a centralized manner;

[0044] (3) Pre-extraction iron removal: crude phosphoric acid is extracted with an organic extractant to remove iron, and the obtained iron-removed crude phosphoric acid enters the extraction section;

[0045] (4) Extraction: P removal from iron crude phosphoric acid 2 o 5 The content is 8%,...

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 belongs to the technical field of preparation of high-quality phosphoric acid from wet-process phosphoric acid, relates to an extraction method in which an extraction centrifuge is adopted for extraction refining of the wet-process phosphoric acid and organic extracting agents enter an extraction system according to different flow ratios, and particularly relates to an extraction method for preparing high-quality phosphoric acid from hydrochloric-acid-process wet-process phosphoric acid. The method includes steps of acid leaching, filter pressing and washing, pre-extraction for deironing, extraction and washing and reverse extraction. In the step of extraction, an extraction station is formed by series connection of multistage extraction equipment, deironing crude phosphoricacid and the extracting agents are subjected to countercurrent extraction in the multistage extraction equipment to obtain an organic phase and a water phase, the organic phase refers to an acid-carrying extracting agent, and the water phase refers to calcium chloride solution. In a countercurrent extraction process, the extracting agents enter the extraction equipment in a series / parallel connection manner, and the deironing crude phosphoric acid enters the first-stage extraction equipment. By adoption of the extraction method, the phosphoric acid extraction rate is increased to 99% or above,and extraction time is shortened by 80-90% as compared with that of an existing extraction process.

Description

technical field [0001] The invention belongs to the technical field of preparing high-quality phosphoric acid by wet-process phosphoric acid, and particularly relates to an extraction method in which an extraction centrifuge is used to extract and refine hydrochloric acid wet-process phosphoric acid, and organic extractants enter the extraction system according to different flow ratios, specifically a hydrochloric acid An extraction method for preparing high-quality phosphoric acid by wet process phosphoric acid. Background technique [0002] The production methods of industrial phosphoric acid and food phosphoric acid mainly include wet method and thermal method. Due to the high energy consumption and high pollution of phosphoric acid produced by thermal method, the production capacity of thermal phosphoric acid is gradually limited. All phosphate fertilizer and phosphoric acid production enterprises turn to develop wet-process phosphoric acid process. The extraction and re...

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
IPC IPC(8): C01B25/46
CPCC01B25/461
Inventor 吕天宝武文焕刘占峰崔吉军温显峰刘新华
Owner SHANDONG LUBEI ENTERPRISE GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com