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Preparation method of catalyst for promoting conversion of ammonia nitrogen in metallurgical wastewater

A catalyst, ammonia nitrogen technology, used in physical/chemical process catalysts, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of waste of active components, increased cost, secondary pollution, etc.

Inactive Publication Date: 2012-11-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at problems such as the uneven distribution of components in the traditional catalyst mixing method, which causes waste of active components and increases the cost, and the ammonia gas evaporated by the ammonia distillation method will cause secondary pollution to the environment. Evenly distributed, reducing costs and evaporating nitrogen, a catalyst preparation method that promotes the conversion of ammonia nitrogen in metallurgical wastewater without polluting the environment

Method used

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Examples

Experimental program
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preparation example Construction

[0022] (3) Preparation of nano-iron oxide colloid: mix ferric chloride with a mass equivalent to 0.10 to 0.20 times the weight of heavy metal organic compounds, add water, heat to 70°C to 78°C to dissolve completely, and titrate the pH of the solution with NaOH with a concentration of 3M = 10.5, stir, generate iron oxide precipitation at constant temperature, wash with deionized water, remove polygold salts, then add formyl ferrocene with a total mass ratio of 0.04%, and drop 2M NaOH solution for 3 to 5 Add drops, accelerate its dissolution under ultrasonic conditions, then add HCl dropwise to adjust pH = 4.0, and heat in a water bath at 60°C-65°C for 40-60min to form the required iron oxide colloid;

[0023] (4) Wet mixing: mix the nano-iron oxide colloid and the heavy metal organic compound in equal volumes, and stir with a powder mixer to make the dispersion uniform;

[0024] (5) Drying: drying in an oven at 114°C to obtain a catalyst precursor;

[0025] (6) Segmented roas...

Embodiment 1

[0031] First, nickel chloride 20g / L, copper carbonate 20g / L, strontium chloride 30g / L, cobalt iodide 20g / L, rhodium chloride 10g / L heavy metal salt solution with methylpentane, n-heptane and Mix toluene and nitrobenzene, add reagents and dry ether, react at a temperature of 50°C for 10 hours to obtain a heavy metal organic compound, then mix ferric chloride with a mass equivalent to 0.10 times the weight of the heavy metal organic compound, add water, and heat to After the entire solution is at 70°C, titrate the solution with 3M NaOH to pH = 10.5, stir, and form iron oxide precipitates at a constant temperature, then add formyl ferrocene with a total mass ratio of 0.04%, and drop 2M NaOH solution at the same time 3 drops, accelerate its dissolution under ultrasonic conditions, then add HCl dropwise to adjust pH = 4.0, heat in a water bath at 60°C for 40 minutes to form iron oxide colloids, then mix with heavy metal organic compounds in equal volume, stir, dry, and dry in a nega...

Embodiment 2

[0034] First, cadmium nitrate 20g / L, silver nitrate 10g / L, strontium chloride 20g / L, cobalt iodide 30g / L, rhodium chloride 10g / L, manganese trioxide 10g / L heavy metal salt solution and dimethylpentyl Mix alkane, n-pentane, n-octane, mononitrochlorobenzene, and phthalic acid, add reagents and dry ether, and react at a temperature of 55°C for 11 hours to obtain a heavy metal organic compound, and then take a mass equivalent to the heavy metal organic compound. Mix ferric chloride with 0.15 times the weight of the compound, add water, heat the whole solution to 75°C, titrate the pH of the solution to 10.5 with NaOH with a concentration of 3M, stir, and form iron oxide precipitation at a constant temperature, then add a total mass ratio of 0.04% At the same time, add 3 drops of 2M NaOH solution dropwise to accelerate its dissolution under ultrasonic conditions, then add HCl dropwise to adjust pH = 4.0, heat in a water bath at 62°C for 50min to form iron oxide colloid, and then mix ...

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Abstract

The invention relates to a preparation method of a catalyst for promoting conversion of ammonia nitrogen in metallurgical wastewater, which comprises the following steps: selecting a mixed solution of heavy metal salts mainly comprising strontium chloride and cobaltous iodide according to the metallurgical wastewater, and mixing the mixed solution with organic compounds with alkyl group and aryl group; after adding the reagents, reacting at a certain temperature to obtain heavy metal organic compounds; mixing and stirring the heavy metal organic compounds and a ferric oxide colloid, which is formed by a preparation method of a nano ferric oxide colloid, by a wet mixing method; drying to obtain a catalyst precursor; carrying out sectional roasting to obtain the catalyst; and finally putting the catalyst in an ammonia still. The invention can uniformize the composition distribution and lower the cost, has the advantages of favorable targeting effect and high removal rate, and more importantly, can not generate secondary pollution to the environment due to no generation of ammonia gas.

Description

technical field [0001] The invention relates to a catalyst preparation method for promoting the conversion of ammonia nitrogen in metallurgical wastewater, which belongs to the field of sewage treatment. Background technique [0002] The metallurgical industry is one of the oldest industries in human history. After the industrial revolution in the 18th century, the iron and steel industry developed rapidly, causing serious pollution. Since the 20th century, the development of the global economy and industry has led to a rapid increase in the scale of metallurgical production, and high concentrations in wastewater The ammonia nitrogen content in the ammonia nitrogen is also increasing. According to the investigation, the wastewater NH discharged from the washing and filtering process of a metallurgical plant 4 + If the content exceeds 10000mg / L, the ammonia nitrogen in the water body will cause eutrophication of lakes and rivers, reduce the concentration of dissolved oxygen,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25B01J27/138C02F1/70C02F1/58
Inventor 雷春生张凤娥王情思
Owner CHANGZHOU UNIV
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