A kind of method that contains tungsten, vanadium, arsenic catalyst to remove arsenic

A catalyst and arsenic removal technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of activity reduction, achieve simple process, reduce cost, The effect of not polluting the environment

Active Publication Date: 2017-01-25
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, especially for the problem that the catalyst contains arsenic and causes its activity to decrease, and proposes a method for removing arsenic from catalysts containing tungsten, vanadium and arsenic. Efficient, safe, and environmentally friendly arsenic removal requirements can also effectively control the loss of tungsten and vanadium, the main components of the catalyst, thereby prolonging the service life of the catalyst and reducing economic costs

Method used

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  • A kind of method that contains tungsten, vanadium, arsenic catalyst to remove arsenic

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1, As in the arsenic-containing catalyst 2 o 3 The content is 3 to 4%. Firstly, the catalyst containing tungsten, vanadium and arsenic, and the sodium hydroxide solution with a concentration of 3g / l are placed in an ultrasonic reactor for alkaline leaching and arsenic removal. m 3 / h, ultrasonic power 500w. During the reaction, the added inhibitor EDTA and ammonium bicarbonate were 3 g / l. After the reaction, liquid-solid separation is carried out, and the liquid phase is subjected to Ca(OH) 2 After the arsenic removal treatment, the obtained solution can be reused in the whole system, and the obtained slag is CaWO 4 , Ca (VO 3 ) 2 , Ca 3 (AsO 4 ) 2 Can be stacked directly.

[0016] After one alkaline leaching, the catalyst is subjected to secondary alkaline leaching. In the process, 1g / l sodium hydroxide solution, 1g / l inhibitor EDTA and 1g / l ammonium bicarbonate are added, which are also carried out in an ultrasonic reactor and controlled. The re...

Embodiment 2

[0018] Embodiment 2, As in the arsenic-containing catalyst 2 o 3 The content is 3 to 4%. Firstly, the catalyst containing tungsten, vanadium and arsenic, and the sodium hydroxide solution with a concentration of 5g / l are placed in an ultrasonic reactor for alkaline leaching and arsenic removal. 1.2m 3 / h, ultrasonic power 500w. During the reaction, 3 g / l of inhibitor EDTA and 4 g / l of ammonium bicarbonate were added. After the reaction, liquid-solid separation is carried out, and the liquid phase is subjected to Ca(OH) 2 After the arsenic removal treatment, the obtained solution can be reused in the whole system, and the obtained slag is CaWO 4 , Ca (VO 3 ) 2 , Ca 3 (AsO 4 ) 2 Can be stacked directly.

[0019] The catalyst after one alkali leaching is subjected to a second alkali leaching, during which 2g / l sodium hydroxide solution and inhibitor 1g / l EDTA and 1g / l ammonium bicarbonate are added, also carried out in an ultrasonic reactor, controlled The reaction te...

Embodiment 3

[0021] Embodiment 3, As in the arsenic-containing catalyst 2 o 3 The content is 3 to 4%. Firstly, the catalyst containing tungsten, vanadium and arsenic, and the sodium hydroxide solution with a concentration of 7g / l are placed in an ultrasonic reactor for alkaline leaching and arsenic removal. 1.2m 3 / h, ultrasonic power 700w. During the reaction, 4 g / l of inhibitor EDTA and 4 g / l of ammonium bicarbonate were added. After the reaction, liquid-solid separation is carried out, and the liquid phase is subjected to Ca(OH) 2 After the arsenic removal treatment, the obtained solution can be reused in the whole system, and the obtained slag is CaWO 4 , Ca (VO 3 ) 2 , Ca 3 (AsO 4 ) 2 Can be stacked directly.

[0022] The catalyst after one alkaline leaching is subjected to secondary alkaline leaching, during which 2g / l sodium hydroxide solution and inhibitor 2g / l EDTA and 2g / l ammonium bicarbonate are added, also carried out in an ultrasonic reactor, controlled Reaction t...

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Abstract

The invention discloses a dearsenification method for a tungsten, vanadium and arsenic-containing catalyst. The method can be used for effectively removing arsenide in the catalyst and further reducing loss of tungsten and vanadium, so that the As2O3 content is less than 0.15%, the dearsenification rate can reach 95% and the WO3 and V2O5 loss rate are less than 30%. The method is simple in process and reliable and feasible. By adopting a method of alkaline leaching to dearsenificate in ultrasonic waves, the arsenide removal rate in the catalyst is relatively high, and an inhibiting agent is added, so that the loss of tungsten and vanadium can be effectively controlled. The wastewater generated in the process can be treated by Ca(OH)2 and is reused in the system. The technical process is a closed system which can be used for realizing cyclic utilization, is free of environmental pollution and further can be used for lowering the cost.

Description

technical field [0001] The invention relates to the technical field of catalyst removal of arsenic, in particular to a method for removing arsenic with a catalyst containing tungsten, vanadium and arsenic. Background technique [0002] Nitrogen oxides (NOx) are one of the major air pollutants recognized around the world. Thermal power plants are the main source of nitrogen oxide emissions in my country. In order to control NOx emissions, many thermal power plants and fossil fuel-burning generating units adopt the relatively mature Selective Catalytic Reduction (SCR) flue gas denitrification technology, the core part of which is a catalyst composed of tungsten, vanadium, titanium, etc. The service life of catalysts in coal power plants is 3 to 5 years. However, due to the trace amount of arsenic in coal-fired boilers, the gaseous As 2 o 3 , easy to enter the pores of the catalyst, react with the vanadium in the catalyst to form a stable vanadium arsenate compound, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30
Inventor 谢刚徐庆鑫和晓才李怀仁魏可徐亚飞李永刚崔涛袁野徐俊毅姚云柯浪
Owner KUNMING METALLURGY INST
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