Concentration method for ammonium salt solutions

An ammonium salt solution and solution technology, applied in solution crystallization, separation method, ammonium nitrate and other directions, can solve the problems of large investment in one-time equipment of multi-effect evaporator, no economic benefits, secondary pollution of exhaust gas, etc. Investment and its operating costs, low concentration costs, and the effect of avoiding corrosion

Inactive Publication Date: 2018-04-03
青岛九洲千和机械有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the multi-effect evaporator used for solution evaporation and concentration is more energy-saving than ordinary evaporators, the one-time equipment investment of multi-effect evaporators is large. For many small enterprises or enterprises with a small amount of ammonium salt wastewater, ammonium salt wastewater is treated by

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] 1000ml of sodium chloride solution containing 10wt% ammonium chloride (ammonium metavanadate crystal mother liquor) was heated to 85°C, 724g of anhydrous aluminum ammonium sulfate powder was added with stirring, dissolved and cooled to room temperature (28°C), and 1364g of sulfuric acid crystallized out Aluminum ammonium alum crystals to obtain an ammonium chloride concentrated solution with a concentration of about 28wt%; the concentrated solution is further cooled to -5°C and the crystallized NH 4 Cl crystals are returned to the stone coal vanadium extraction solution for vanadium precipitation; NH 4 Cl crystallization mother solution Sodiumized roasting agglomerates in stone coal; aluminum ammonium sulfate crystal muffle furnace is dehydrated at 220°C for 2 hours and then returned to the crystallization concentration process for recycling.

Example Embodiment

[0022] Example 2

[0023] 2.5m3 of 6wt% ammonium nitrate waste liquid was heated to 75°C, 2075kg anhydrous aluminum ammonium sulfate powder was added with stirring, and cooled to room temperature (25°C) after dissolution, and 3803kg aluminum ammonium sulfate crystals were crystallized and the concentration was about 29wt% The ammonium nitrate primary crystal concentrate is 634L; the aluminum ammonium sulfate crystals are dehydrated at 230°C for 1.5 hours, crushed for the secondary crystal concentration of the ammonium nitrate solution; the ammonium nitrate primary crystal concentrate is heated to 95°C, and 400kg dehydrated aluminum ammonium sulfate is added with stirring After dissolving the alum powder, it is cooled to room temperature (30°C), and 813kg aluminum ammonium sulfate alum crystals are crystallized, and at the same time, an ammonium nitrate secondary crystal concentrate with a concentration of about 60wt% is obtained; the secondary crystal concentrate is first added wi...

Example Embodiment

[0024] Example 3

[0025] 2000ml of ammonium nitrate 12wt% ammonium molybdate acid precipitation crystallization mother liquor is ion-exchanged to remove molybdenum and heated to 80°C, stirred and added 700g of petrolatum to extract vanadium to form aluminum ammonium sulfate and aluminum potassium sulfate mixed vanadium crystal powder obtained after dehydration After dissolving and cooling to room temperature (20°C), 1303g aluminum ammonium sulfate crystals were crystallized to obtain 370ml of ammonium nitrate primary crystal concentrate with a concentration of about 30wt%; after dehydration of aluminum ammonium sulfate crystals at 210°C for 2.5 hours, Crushing is used for secondary crystal concentration; the ammonium nitrate primary crystal concentrate is heated to 90°C, and 240g of dehydrated aluminum ammonium sulfate powder is added with stirring. After dissolving, it is cooled to room temperature (30°C), and 473g aluminum ammonium sulfate crystals are crystallized to obtain th...

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 method for concentrating an ammonium salt solution. The technological process mainly includes: adding dehydrated aluminum ammonium (potassium) alum to the ammonium salt solution and heating and dissolving it; Concentrated; aluminum ammonium sulfate (potassium) alum is heated and dehydrated for recycling; the concentrated ammonium salt solution is comprehensively utilized. It has the advantages of simple operation, environmental friendliness, strong process adaptability, low concentration cost, and zero discharge of waste water.

Description

technical field [0001] The invention relates to a method for concentrating an ammonium salt solution, which belongs to the field of chemical industry. Background technique [0002] The development of ammonia nitrogen wastewater treatment technology has become the focus and hot spot in the field of water pollution control engineering. Ammonia nitrogen wastewater mainly comes from metallurgy, chemical industry and other industries, and its ammonia nitrogen mainly exists in the wastewater in the form of ammonium salt. There are many methods that can effectively remove ammonium salts in wastewater, such as biological methods, physical methods, chemical methods, etc. At present, the domestic treatment methods for dilute ammonium salt wastewater mainly include: pretreatment first, and then the activated sludge method; or membrane interception pre-concentration, evaporation and concentration, and then cooling and crystallization. However, the operating cost of membrane intercepti...

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): C01C1/16C01C1/18C01D5/08B01D9/02
CPCC01C1/164B01D9/00B01D2009/0086C01C1/185C01D5/08
Inventor 李辉
Owner 青岛九洲千和机械有限公司
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