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System and method for resource recycling of vanadium-titanium-tungsten series denitration catalysts and water recycling use

A catalyst and resource-based technology, applied in chemical instruments and methods, chemical recycling, water/sewage treatment, etc., can solve problems such as water recycling and secondary pollution that have not been paid attention to, to improve purity, reduce waste water generation, The effect of simple process operation

Pending Publication Date: 2019-08-13
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most processes do not pay attention to the recycling of water in the recycling process of denitrification catalysts, which will eventually produce high-concentration saline waste liquid, which is likely to cause secondary pollution

Method used

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  • System and method for resource recycling of vanadium-titanium-tungsten series denitration catalysts and water recycling use
  • System and method for resource recycling of vanadium-titanium-tungsten series denitration catalysts and water recycling use

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The waste vanadium-titanium-tungsten denitrification catalyst is cleaned, crushed, ground and sieved in the pretreatment unit 1 to make a powder with a particle size of less than 100 mesh, which is sent to the reaction chamber of the alkali leaching unit 2 using sodium hydroxide; It is a 40% NaOH solution, in which the solid-to-liquid ratio of the catalyst powder to the NaOH solution is 1g:5mL, then heated to 80°C, and stirred at a constant temperature for 4 hours; the reaction product is filtered to obtain a TiO-containing 2 The precipitate and the basic filtrate containing vanadium and tungsten; the filtrate is sent to the reaction chamber of the pH adjustment unit 3 using sulfuric acid, and the mass fraction of 30% H is added 2 SO 4 The solution is adjusted to a pH value of 11, filtered after standing for 12 hours, and the crystals are removed. After the filtrate is adjusted to pH=11, it is transported to the reaction chamber of the ammonium sulfate vanadium precipit...

Embodiment 2

[0052] The waste vanadium-titanium-tungsten denitrification catalyst is cleaned, crushed, ground and sieved in the pretreatment unit 1 to make a powder with a particle size of no more than 100 mesh, which is sent to the reaction chamber of the alkali leaching unit 2 using sodium hydroxide; NaOH solution with a fraction of 30%, wherein the solid-to-liquid ratio of the catalyst powder to the NaOH solution is 1g:4mL, then heated to 100°C, and stirred at a constant temperature for 6 hours; the reaction product is filtered to obtain a TiO-containing 2 The precipitate and the basic filtrate containing vanadium and tungsten; the filtrate is sent to the reaction chamber of the pH adjustment unit 3 using sulfuric acid, and the mass fraction of 40% H is added 2 SO 4 The solution is adjusted to a pH value of 8, filtered after standing for 12 hours, and the crystals are removed. After the filtrate is adjusted to pH=12, it is transported to the reaction chamber of the ammonium sulfate vana...

Embodiment 3

[0054] The waste vanadium-titanium-tungsten denitrification catalyst is cleaned, crushed, ground and sieved in the pretreatment unit 1 to make a powder with a particle size of no more than 100 mesh, which is sent to the reaction chamber of the alkali leaching unit 2 using sodium hydroxide; NaOH solution with a fraction of 50%, wherein the solid-to-liquid ratio of the catalyst powder to the NaOH solution is 1g:10mL, then heated to 90°C, and stirred at a constant temperature for 2 hours; the reaction product is filtered to obtain a TiO-containing 2 The precipitate and the basic filtrate containing vanadium and tungsten; the filtrate is sent to the reaction chamber of the pH adjustment unit 3 using sulfuric acid, and the mass fraction of 50% H is added 2 SO 4 The solution is adjusted to a pH value of 12, filtered after standing for 12 hours, and the crystals are removed. After the filtrate is adjusted to pH=11, it is transported to the reaction chamber of the ammonium sulfate van...

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Abstract

The invention provides a method for resource recycling of vanadium-titanium-tungsten series denitration catalysts and water recycling use. The method for resource recycling of the vanadium-titanium-tungsten series denitration catalysts and water recycling use comprises the step that after alkali liquid titanium-removing reaction, acid liquid impurity-removing, ammonium sulfate vanadium precipitation and sulfuric acid tungsten precipitation reaction are conducted on catalyst powder and a filtered liquid acquired is electrolyzed, sulfuric acid and alkaline liquid are recycled and utilized. The invention further discloses a system applicable to the method. The system comprises a preprocessing unit, an alkaline leaching unit, a pH adjustment unit, an ammonium sulfate vanadium precipitation unit, a sulfuric acid tungsten precipitation unit, a chemical precipitation ammonium-removing unit and a sodium sulfate electrolysis unit which are sequentially connected. The acid liquor outlet of the sodium sulfate electrolysis unit is connected with the pH adjustment unit and the sulfuric acid tungsten precipitation unit. The alkaline liquid outlet of the sodium sulfate electrolysis unit is connected with the alkaline leaching unit and the chemical precipitation ammonium-removing unit. With a resource recycling technology of the denitration catalysts and a saliferous waste water processing recycling technology combined, saliferous waste water generated in the production process can be utilized cyclically, and generation of waste water is reduced so that the resource recycling process of the catalysts is more environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of treatment and disposal of denitrification catalysts, and in particular relates to a resource recovery and water recycling system and method for vanadium, titanium and tungsten series denitration catalysts. Background technique [0002] With the full implementation of the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the denitrification technology based on Selective Catalytic Reduction (SCR) has been widely used in coal-fired power plants. Due to the limitation of the service life of the catalyst, its activity will gradually decrease. For the deactivated catalyst, the first consideration is regeneration. If the regeneration method still cannot restore its activity, the catalyst can only be replaced. [0003] For waste denitrification catalysts, "Technical Specifications for Flue Gas Denitrification Engineering in Thermal Power Plants-Selective Catalytic Reduction Method" (...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/22C22B34/12C22B34/22C22B34/36C25B1/16C25B1/22C02F9/06
CPCC22B7/009C22B7/006C22B7/008C22B34/225C22B34/365C22B34/1213C22B26/22C25B1/16C25B1/22C02F9/00C02F1/52C02F1/461Y02P20/584Y02P10/20
Inventor 余智勇张畅任志博王广
Owner HUANENG CLEAN ENERGY RES INST
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