Device and method for removing free ammonia from mixed slurry of ammonium sulfate and calcium carbonate

A mixed slurry and calcium carbonate technology, applied in the field of ammonia removal, can solve the problems of unorganized ammonia emissions affecting the operating environment, affecting production costs, increasing ammonia consumption, etc., to improve the production operating environment, reduce production costs, and reduce steam consumption Effect

Active Publication Date: 2014-08-27
SINOPEC NANJING ENG & CONSTR +1
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Free ammonia cannot be completely recovered
The mixed slurry containing free ammonia is filtered first, the filter cannot be completely sealed, and the ammonia gas cannot be completely recovered, which increases ammonia consumption and affects production costs
[0008] (2) Fugitive discharge of ammonia affects the

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
  • Device and method for removing free ammonia from mixed slurry of ammonium sulfate and calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The slurry of 66 kilograms / hour ammonium sulfate scale, utilizes above-mentioned device to realize the method for removing free ammonia in ammonium sulfate and calcium carbonate mixed slurry, the concrete steps of this method are as follows, and operating conditions are as shown in table 1.

[0033] The ammonia water tank is first fed with the absorption liquid, the ammonia water pump and the circulating cooling pump are started, and the circulating cooling water is introduced. Send the mixed slurry of ammonium sulfate and calcium carbonate into the deamination tank, maintain the tank in a fully mixed flow state through the agitator, maintain the absolute pressure inside the deamination tank at 20-50KPa, and use the steam jacket of the deamination tank to heat ( Saturated steam of 0.2-0.4Mpa) makes the slurry in a boiling state (65-110°C). After heating and boiling, the gas (ammonia and water vapor) generated in the deamination tank enters the condenser and condenses to ...

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 discloses a device and a method for removing free ammonia from mixed slurry of ammonium sulfate and calcium carbonate, and belongs to the technical field of deamination. The method adopts the following technical scheme: feeding mixed slurry of ammonium sulfate and calcium carbonate to a deamination tank; and heating the slurry to be in a boiling state by steam under a negative pressure condition, and then feeding the generated mixed gas into a condenser; conveying an absorption liquid to an ammonia tank after the generated ammonia gas is absorbed by the absorption liquid in a hydraulic ejector. By adopting the technical scheme, the removal rate for removing the free ammonia from the slurry is over 90%, the removed free ammonia is recycled to prepare ammonium hydroxide, and the recovery rate can be up to 100%. In addition, a sulfuric acid does not need to be added in the technical scheme, the moisture content of the mixed slurry is reduced in deamination, the problem of unorganized emission of ammonia in the process of preparing ammonium sulfate from phosphogypsum is solved, the production intensity of a filter separator in the process for preparing ammonium sulfate from phosphogypsum is improved, ammonia consumption of the system is reduced, the production cost is reduced, and the production and operation environment is improved.

Description

technical field [0001] The invention belongs to the technical field of ammonia removal, and in particular relates to a device and a method for removing free ammonia in mixed slurry of ammonium sulfate and calcium carbonate. Background technique [0002] At present, the solid waste treatment of phosphogypsum is a common problem in the domestic phosphorus chemical industry. According to the national "Twelfth Five-Year" development plan, in 2015, my country's annual industrial by-product phosphogypsum will reach 80 million tons. The current comprehensive utilization rate is only about 20%. [0003] Using phosphogypsum to produce ammonium sulfate is a route for resource utilization of phosphogypsum. As early as 1914, I.G.Farben Industries proposed the process of making ammonium sulfate from gypsum. India's Chavanka Fertilizer and Chemical Company (FACT) researched and developed the Chavanka process for producing ammonium sulfate from phosphogypsum, and in 1960 Established a f...

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): C01C1/02C01C1/24
Inventor 孙国超刘项孙菊萍刘瑞钫
Owner SINOPEC NANJING ENG & CONSTR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap