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A method for strengthening aluminum ash denitrification by pressure regulation-hydrothermal cyclone process

A technology for denitrification and aluminum ash, applied in the direction of solid waste removal, etc., can solve problems such as aluminum ash pollution, achieve the effect of shortening the time and improving the effect

Active Publication Date: 2018-05-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for strengthening the denitrification of aluminum ash by pressure regulation-hydrothermal swirling process, so as to solve the pollution problem of aluminum ash, and turn aluminum ash into a usable powder material after treatment

Method used

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  • A method for strengthening aluminum ash denitrification by pressure regulation-hydrothermal cyclone process

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Effect test

Embodiment 1

[0031] Step 1, gray aluminum separation: take 1.25t of aluminum ash slag, separate the metal aluminum in the aluminum ash slag, and remelt the separated metal aluminum into aluminum ingots;

[0032] Step 2, feeding: add 1 ton of aluminum ash obtained after aluminum extraction, add 1 ton of cold water to make slurry, the temperature of cold water is 15-30°C, inject into the reactor, add 1 ton of preheated water at 50°C to the reactor, and Add surfactant (preferably 50kg sodium hexametaphosphate), and accelerator (preferably 100kg sodium hydroxide);

[0033] Step 3, denitrification: The reaction conditions are temperature 80°C, swirl speed 80r / min, the pressure regulation process takes 120min as a cycle, and one cycle is decompression to maintain the pressure in the tank at 0.01MPa for 90min, and then pressurize to make the pressure in the tank Maintain 0.10MPa for 30 minutes, complete 2 pressure adjustment cycles during the denitrification process, the reaction time is 4 hours,...

Embodiment 2

[0039] Step 1, ash / aluminum separation: take 1.25t of aluminum ash slag, separate the metal aluminum in the aluminum ash slag, and remelt the separated metal aluminum into aluminum ingots;

[0040] Step 2, material: Add 1.5t of cold water to slurry the obtained aluminum ash after extracting aluminum, the temperature of cold water is 15-30°C, inject it into the reactor, add 3.5t of preheated water at 80°C into the reactor, And add 1kg sodium dodecylbenzenesulfonate and 0.1kg sodium bicarbonate;

[0041] Step 3, denitrification: the reaction conditions are temperature 150°C, swirl speed 40r / min, the pressure regulation process takes 240min as a cycle, and one cycle is decompression to maintain the pressure in the tank at 0.09MPa for 60min, and then pressurize to make the pressure in the tank Maintain 0.20MPa for 180 minutes, complete 2 pressure adjustment cycles during the denitrification process, the reaction time is 8 hours, and the mixed gas of ammonia and water vapor generat...

Embodiment 3

[0045] Step 1, ash / aluminum separation: take 1.25t of aluminum ash slag, separate the metal aluminum in the aluminum ash slag, and remelt the separated metal aluminum into aluminum ingots;

[0046] Step 2, feeding: Add 1t of aluminum ash obtained after aluminum extraction, add 2t of cold water to make slurry, the temperature of cold water is 15-30°C, inject it into the reactor, add 8t of preheated water at 80°C into the reactor, and Add 10kgCTAB, 10kg sodium hexametaphosphate and 10g sodium dodecylbenzenesulfonate mixture as surfactant, and 5kg sodium carbonate as accelerator;

[0047] Step 3, denitrification: the reaction conditions are temperature 110°C, swirl speed 10r / min, the pressure regulation process takes 30min as a cycle, and one cycle is decompression to keep the pressure in the tank at 0.01MPa for 15min, and then pressurize to make the pressure in the tank Maintain 0.20MPa for 15 minutes, complete 2 pressure adjustment cycles during the denitrification process, the...

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Abstract

The invention discloses a method for strengthening the denitrification of aluminum ash by a pressure regulating-hydrothermal swirl process, which belongs to the field of environmental protection materials. The invention is divided into five steps of ash / aluminum separation, feeding, denitrification, sedimentation, filtration and washing, and drying. In step 3, adjust the water temperature and gas pressure in the reactor, apply swirl, control the ammonia escape rate, control the aluminum ash denitrification reaction rate, improve the aluminum ash denitrification efficiency; in step 3, add surfactant and promote agent, shorten the denitrification time, improve the denitrification effect, and the nitrogen content of the treated powder is lower than 0.05%; add flocculant during the settling process in step 4, so that the fine particles in the aluminum ash in step 3 can be completely settled; step 5 Classify denitrified aluminum ash powder. The inventive process realizes denitrification treatment of aluminum ash, has simple process, low production cost, realizes full recycling of water and heat, saves energy and protects the environment, and avoids environmental pollution and resource waste caused by aluminum ash.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a method for strengthening aluminum ash denitrification by using a pressure regulating-hydrothermal swirl process. Background technique [0002] Aluminum ash is a kind of highly polluting waste produced in the process of aluminum industry such as primary aluminum production, aluminum alloy and processing, and waste aluminum recycling. The waste is an inevitable product formed by the reaction of aluminum and air at high temperature, and the output is huge. The composition of aluminum ash is complex and varies slightly due to different production processes, raw materials and operating conditions of manufacturers, but it usually contains metal aluminum, aluminum oxides, nitrides, chloride salts and some other components. [0003] At present, after the aluminum ash is separated from the entrained metal aluminum, most of it is stockpiled or land...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 付高峰姜澜丁友东喻亮李子申杨洪亮姜艳丽
Owner NORTHEASTERN UNIV LIAONING
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