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Method for extracting valuable elements from waste denitration catalysts by virtue of medium-temperature tunnel type solid-state activation

A technology for waste denitration catalyst and denitration waste catalyst, which is applied in the direction of improving process efficiency, can solve the problems of high recovery energy consumption, air pollution, and increase of waste gas treatment devices, and achieves fine separation and recovery process, low energy consumption, and process environmental protection. Effect

Active Publication Date: 2019-09-10
云南方圆矿产资源再生综合利用研究院有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Dry recovery includes sublimation method, oxidation roasting method and chloride volatilization method, etc., which are commonly used in Cu-Ni, Ni-Mo / Al 2 o 3 recovery of metals in catalysts, etc., but dry recovery consumes a lot of energy, and SO may be released during melting and calcination x And organic matter, causing air pollution, need to increase waste gas treatment device

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  • Method for extracting valuable elements from waste denitration catalysts by virtue of medium-temperature tunnel type solid-state activation

Examples

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Effect test

Embodiment 1

[0021] The raw material comes from a power plant in Guizhou SCR denitrification waste catalyst, in which the content of titanium oxide is 86.2%, the content of vanadium pentoxide is 0.47%, and the content of tungstic acid is 3.72%. The catalyst is crushed to 80 mesh > 98%, mixed evenly with 20% sodium carbonate and 3% sodium-based double salt, extruded, sent to a tunnel-type activation reactor for activation for 2 hours, and passed through a preheating zone at 200°C , The activation reaction zone is 650°C, and the cooling zone is 90°C. Send the activated material to a high-speed disperser with water for water extraction first, then disperse and disperse the material at a high speed, and pump it to a high-efficiency leaching tank under a state of uniform stirring. 3:1 stirring reaction for 2 hours, after the reaction leaching is completed, after liquid-solid separation, the leach residue is washed and dried to obtain a titanium oxide product with a purity of 95.5%; the leaching...

Embodiment 2

[0023] The raw material comes from a power plant in Guizhou SCR denitrification waste catalyst, in which the content of titanium oxide is 85.2%, the content of vanadium pentoxide is 0.57%, and the content of tungstic acid is 3.92%. The catalyst is crushed to 80 mesh > 98%, mixed evenly with 15% sodium carbonate and 1.5% sodium-based double salt, extruded, sent to a tunnel-type activation reactor for activation for 2 hours, and passed through a preheating zone at 200°C , The activation reaction zone is 700°C, and the cooling zone is 90°C. Send the activated material to a high-speed disperser with water for water extraction first, then disperse and break up the material at a high speed, and pump it to a high-efficiency leaching tank under a state of uniform stirring. 3:1 stirring reaction for 2 hours, after the reaction leaching is completed, after liquid-solid separation, the leach residue is washed and dried to obtain a titanium oxide product with a purity of 95.1%; the leachi...

Embodiment 3

[0025]The raw material comes from a power plant in Guizhou SCR denitrification waste catalyst, in which the content of titanium oxide is 87.2%, the content of vanadium pentoxide is 0.61%, and the content of tungstic acid is 3.82%. The catalyst is crushed to 80 mesh>98%, mixed evenly with 10% sodium carbonate and 2% sodium-based double salt, extruded, sent to a tunnel-type activation reactor for activation for 2 hours, and passed through a preheating zone at 200°C , The activation reaction zone is 750°C, and the cooling zone is 90°C. Send the activated material to a high-speed disperser with water for water extraction first, then disperse and disperse the material at a high speed, and pump it to a high-efficiency leaching tank under a state of uniform stirring. 3:1 stirring reaction for 2 hours, after the reaction leaching is completed, after liquid-solid separation, the leach residue is washed and dried to obtain a titanium oxide product with a purity of 95.5%; the leaching fi...

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Abstract

The invention discloses a method for extracting valuable elements from waste denitration catalysts by virtue of medium-temperature tunnel type solid-state activation. The method comprises the following steps of carrying out superfine treatment on broken the SCR denitration waste catalysts which are used as raw materials, adding proper alkali salt and an activating agent, mixing, carrying out extrusion forming, feeding the mixture into a tunnel type activation reaction machine to be activated, carrying out water quenching on the activated material, carrying out slurry mixing, pumping slurry toan ultrasonic high-efficiency leaching tank, and leaching ore pulp to obtain leached residues and vanadium-containing and tungsten-containing filtrate through filtration; washing and drying the leaching residues to obtain a titanium dioxide product; adding a double salt into the filtrate to remove impurities of silicon and aluminum, adding a precipitant into liquid with the impurities removed to precipitate vanadium and tungsten, then after conducting washing and filtering on the precipitate and selectively leaching the vanadium out of the precipitate, carrying out liquid-solid separation, andwashing and drying the obtained slag phase to obtain a calcium tungstate product; and adding ammonium hydroxide into the vanadium-containing filtrate to precipitate vanadium, and finally recovering the vanadium element in the form of ammonium metavanadate. According to the method disclosed by the invention, the valuable elements in the waste catalysts are finely separated, the recovery rate is high, the energy consumption is low, and the produced waste liquid is recycled, thus avoiding secondary pollution.

Description

technical field [0001] The invention belongs to the field of recovery of spent SCR denitrification catalysts, and in particular relates to a process for recovering spent SCR catalysts containing tungsten, vanadium and titanium. Background technique [0002] With the continuous improvement of people's living and production needs, the demand for electricity is also rising. However, the combustion of a large amount of fossil fuels in the process of thermal power generation will produce a large amount of SO 2 , CO 2 , NO x The harm to the ecological environment is also intensified, and the smoke particles formed by the incomplete combustion of fossil energy will aggravate the smog and seriously affect human life and health; NO x It will combine with water in the air to produce nitric acid and nitrate, which will aggravate the formation of acid rain; under certain conditions, nitrogen oxides will combine with other atmospheric pollutants to produce photochemical smog pollution;...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B7/00C22B34/12C22B34/22C22B34/36
CPCC22B1/005C22B7/006C22B7/009C22B7/007C22B34/1236C22B34/225C22B34/365Y02P10/20
Inventor 谭林平兰立华吴建存
Owner 云南方圆矿产资源再生综合利用研究院有限公司
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