Process for recycling precious metal vanadium in flue gas desulfurization sludge

A technology for desulfurization sludge and precious metals, which is applied in the fields of resource utilization, environmental protection, solid waste treatment and resource utilization, can solve problems such as waste of resources, achieve the effects of reducing environmental hazards, simple and convenient operation, and easy cost control

Inactive Publication Date: 2017-03-08
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these spray liquids and sludge contain a large amount of precious metals, and the content of many metals has exceeded their grades in metal mines. Direct treatment or landfilling has caused a great waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take about 5kg of wet flue gas desulfurization sludge from the power plant, grind it into powder and extract it with 50% sulfuric acid. The solution is heated to 80 degrees for 60 minutes. The sludge is reserved for the next extraction test. Take out the supernatant, add 10L of the extract, the ratio of the extractant P204, TBP and kerosene is 18:6:76, and the pH is controlled at about 2.5. After stirring for 10 minutes, let it stand for stratification, and discharge the water phase. Add 2mol / L sulfuric acid as stripping agent, stir for 10min, and take out the water tank after standing still. Add 300 g of ammonium chloride, take out the precipitate, and burn it in a muffle furnace at 500 degrees for 6 hours to obtain a white powder. Through experimental analysis, V 2 o 5 The purity is greater than 95%.

Embodiment 2

[0029] Take about 5kg of wet flue gas desulfurization sludge from the power plant, grind it into powder and extract it with 50% sulfuric acid. The solution is heated to 60 degrees for 90 minutes. The sludge is reserved for the next extraction test. Take out the supernatant, add 10L of the extract, the ratio of the extractant P204, TBP and kerosene is 18:6:76, and the pH is controlled at about 3. After stirring for 10 minutes, let it stand for stratification, and discharge the water phase. Add 2mol / L hydrochloric acid as stripping agent, stir for 10min, and take out the water tank after standing still. Add 300 g of ammonium chloride, take out the precipitate, and burn it in a muffle furnace at 500 degrees for 6 hours to obtain a white powder. Through experimental analysis, V 2 o 5 The purity is greater than 95%.

Embodiment 3

[0031] Take about 5kg of wet flue gas desulfurization sludge from the power plant, grind it into powder and extract it with 50% sulfuric acid. The solution is heated to 90 degrees for 10 minutes. The sludge is reserved for the next extraction test. Take out the supernatant, add 10L of the extract, the ratio of the extractant P204, TBP and kerosene is 18:6:76, and the pH is controlled at about 1. After stirring for 10 minutes, let it stand for stratification, and discharge the water phase. Add 2mol / L sulfuric acid as stripping agent, stir for 10min, and take out the water tank after standing still. Add 300 g of ammonium chloride, take out the precipitate, and burn it in a muffle furnace at 500 degrees for 6 hours to obtain a white powder. Through experimental analysis, V 2 o 5 The purity is greater than 90%.

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PUM

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Abstract

The invention provides a process for recycling precious metal vanadium in flue gas desulfurization sludge. The process mainly includes the following steps that firstly, metal elements in spraying liquid are enriched in a sedimentation manner, and preprocessing is conducted at the same time; secondly, sediment in the first step is smashed and ground together with the sludge; thirdly, an acid extracting agent is added to conduct mixing, extracting and standing after the sludge raw material in the second step is smashed, supernatant remains to be neutralized, and the sinking sludge is filtered and washed; fourthly, leachate in the third step conducts ion exchange, and vanadium-containing ions are extracted; fifthly, reextraction is conducted on an organic phase solution in the fourth step, and a high-concentration vanadium-containing solution is obtained; sixthly, ammonium chloride is added in the vanadium-containing solution in the fifth step, and filtration and sedimentation are conducted; and seventhly, pentavalent vanadium sediment in the sixth step is brunt, and vanadium pentoxide is prepared. The process is high in recycling rate and has remarkable economic benefits; harm to the environment is reduced; and the process is simple in flow, and the result is easy to achieve.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and resource utilization, in particular to a method for recovering precious metal vanadium in flue gas desulfurization sludge, and belongs to the fields of environmental protection and resource utilization. Background technique [0002] Vanadium metal elements generally exist in ore, petroleum and other minerals, and these raw materials are widely used in thermal power plants, non-ferrous metal smelting, chemical industry and other industries. The precious metal vanadium is an associated element. During the high-temperature smelting of minerals, the precious metal vanadium will also be gasified at high temperature, and will enter the flue gas treatment device together with other flue gases. [0003] Flue gas treatment generally adopts wet treatment, and the main component of flue gas is sulfur dioxide. The desulfurization spray liquid contains a large amount of heavy metal pollutants in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22
CPCC22B34/22
Inventor 韩正昌马军军韩峰朱家明高亚娟张寅丞朱伯淞陶志慧何建龙季军吴传宝张寿兵
Owner NANJING GW ENVIRONMENT ENG
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