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

Method for recovering barium sulfate in the desulfurization process of extracting and refining wet-process phosphoric acid

A technology of wet-process phosphoric acid and recovery method, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problem of long purification process production line, high process operation intensity and complex reaction system and other problems, to achieve the effect of high cost performance, high product quality and simple process flow

Active Publication Date: 2017-11-10
HUAZHONG NORMAL UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art such as complex process, high cost, and high environmental protection pressure, and at the same time avoid the defects of the prior art such as complex reaction system, long purification process production line, and high process operation intensity, and provide a process A method for recovering barium sulfate in the desulfurization process of extraction and refining wet-process phosphoric acid with simple process, high product quality and strong environmental protection

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
  • Method for recovering barium sulfate in the desulfurization process of extracting and refining wet-process phosphoric acid
  • Method for recovering barium sulfate in the desulfurization process of extracting and refining wet-process phosphoric acid
  • Method for recovering barium sulfate in the desulfurization process of extracting and refining wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] see Figure 1 to Figure 14 , a method for recovering barium sulfate in the desulfurization process in extracting and refining wet-process phosphoric acid, the recovery method comprising the following steps in turn:

[0093] Pulping and centrifugation process: first put the barium sulfate filter cake in the sodium hydroxide solution pool and stir evenly. The mass percentage concentration of the sodium hydroxide solution is 5%, and the stirring time is 0.5 hours, and then the slurry obtained by stirring is transported Centrifuge in a centrifuge to obtain the initial filter cake, then wash the initial filter cake with hot water to obtain the final filter cake, the washing temperature of the hot water is 75°C; wherein the barium sulfate filter cake includes barium sulfate and an organic sedimentation agent, and The mass percent concentration of barium sulfate is greater than or equal to 90%;

[0094] High-temperature roasting process: put the above-mentioned final filter c...

Embodiment 2

[0098] Basic content embodiment 1, the difference is:

[0099] Pulping and centrifugation process: the mass percentage concentration of sodium hydroxide solution is 5%, the stirring time is 1 hour, and the washing temperature of hot water is 75°C;

[0100] High-temperature roasting process: the roasting temperature is 600°C, and the roasting time is 1 hour;

[0101] Ethanol washing and pulping process: the mass percent concentration of the ethanol solution is 80%, and its usage is twice the volume of the filter cake powder; the mass percent concentration of the barium sulfate slurry is 75%;

[0102] Spray drying process: the spray drying temperature is 180°C, the properties of the barium sulfate powder are: barium sulfate content is equal to 99.9%, whiteness > 99.8, D 50 =0.15μm, moisture<0.05%.

Embodiment 3

[0104] Basic content embodiment 1, the difference is:

[0105] Pulping and centrifugation process: the mass percentage concentration of sodium hydroxide solution is 3%, the stirring time is 0.8 hours, and the washing temperature of hot water is 72°C;

[0106] High-temperature roasting process: the roasting temperature is 800°C, and the roasting time is 0.5 hours;

[0107] Ethanol washing and pulping process: the mass percentage concentration of the ethanol solution is 70%, and its usage is 2.5 times the volume of the filter cake powder; the mass percentage concentration of the barium sulfate slurry is 65%;

[0108] Spray drying process: the spray drying temperature is 160°C, the properties of the barium sulfate powder are: barium sulfate content is equal to 99.8%, whiteness > 99.8, D 50 =0.16μm, moisture<0.05%.

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

PropertyMeasurementUnit
melting pointaaaaaaaaaa
whitenessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for recovering barium sulfate from a desulfuration process for extracting and refining hosphoric acid by wet process. The method comprises the following steps: firstly placing barium sulfate filter cake in a sodium hydroxide solution pool for uniformly stirring, then centrifuging and washing stirred slurry with hot water to obtain final filter cake, then carrying out high-temperature roasting on the final filter cake, smashing roasted filter cake to filter cake powder, then drenching the filter cake powder with ethanol solution to obtain barium sulfate size, and finally feeding barium sulfate size into a spray dryer for spraying and drying to obtain barium sulfate powder. The barium sulfate powder is characterized in that the content of barium sulfate is larger than or equal to 99.8%, the whiteness is larger than 99.8, D50 is equal to 0.12-0.18 [mu]m and the moisture is less than 0.05%. The design belongs to scope of reclamation as a whole, waste of resources can be avoided, the technological process is simple, the product quality is high, the cohesion and the coordination of the process are good, and the environmental protection property is strong.

Description

technical field [0001] The invention relates to a method for preparing barium sulfate, in particular to a method for recovering barium sulfate in the desulfurization process of extracting and refining wet-process phosphoric acid, which is specifically suitable for simplifying the process flow and enhancing environmental protection on the basis of ensuring high product quality. Background technique [0002] Barium sulfate is an important chemical raw material. It is mainly used as a raw material or filler for paints, inks, plastics, advertising pigments, cosmetics, and storage batteries. It is also used in industries such as ceramics, enamel, and dyes, and is also a raw material for the preparation of other barium salts. In nature, barium sulfate mainly exists in mineral resources in the form of barite. Precipitated barium sulfate produced in industry is generally white amorphous powder with a relative density of 4.5 and a melting point of 1580°C. It is hardly soluble in wate...

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): C01F11/46
CPCC01F11/462C01P2004/62C01P2006/80
Inventor 侯炎学吴杰
Owner HUAZHONG NORMAL UNIV
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