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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
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  • Summary
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  • Application Information

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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 multi-effect evaporation concentration. There are social benefits but no economic benefits
In addition, for ammonium salt wastewater containing corrosive anions such as Cl-, the equipment in the evaporation and concentration process is severely corroded, and the waste gas generated by evaporation is likely to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0023] 2.5m3 waste liquid containing ammonium nitrate 6wt% was heated to 75°C, stirred and added 2075kg of anhydrous ammonium aluminum sulfate powder, cooled to room temperature (25°C) after dissolving, and 3803kg of ammonium aluminum sulfate crystals were crystallized to obtain a concentration of about 29wt%. The ammonium nitrate primary crystallization concentrate is 634L; the ammonium aluminum sulfate alum crystals are dehydrated at 230°C for 1.5 hours, crushed and used for the secondary crystallization concentration of the ammonium nitrate solution; the ammonium nitrate primary crystallization concentrate is heated to 95°C, and 400kg of dehydrated aluminum ammonium sulfate is added with stirring Alum powder, after dissolving, be cooled to room temperature (30 ℃), crystallize and separate out 813kg aluminum ammonium sulfate alum crystals, obtain the ammonium nitrate secondary crystallization concentrate of concentration about 60wt% simultaneously; , and then quantitatively a...

Embodiment 3

[0025] 2000ml of ammonium nitrate containing 12wt% ammonium molybdate acid precipitation crystallization mother liquor is heated to 80°C after ion exchange to remove molybdenum, stirring and adding 700g of stone coal acid leaching of vanadium to form the powder obtained after dehydration of aluminum ammonium sulfate and aluminum potassium sulfate mixed alum crystals , be cooled to room temperature (20 ℃) ​​after dissolving, and crystallization separates out 1303g aluminum ammonium sulphate alum crystals, obtains the ammonium nitrate primary crystallization concentrated solution 370ml that concentration is about 30wt%; Crushing is used for secondary crystallization and concentration; the primary crystallization concentrate of ammonium nitrate is heated to 90°C, stirred and added with 240g of dehydrated ammonium aluminum sulfate powder, dissolved and cooled to room temperature (30°C), and 473g of ammonium aluminum sulfate crystals are crystallized to obtain the concentration Abou...

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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

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Application Information

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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
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