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A method for electromagnetically enhanced yellow phosphorus electrostatic precipitator ash leaching and recovery of high-purity potassium

A technology of electromagnetic strengthening and electrostatic precipitation, applied in the direction of improving process efficiency, etc., can solve the problems of small dissolution capacity and poor selectivity of metal oxides, achieve good solubility and selective solubility, good electrical conductivity, and solve high risk Effect

Active Publication Date: 2021-04-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] First of all, the general ionic liquid has the disadvantages of small dissolution capacity and poor selectivity for metal oxides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Take dibenzo-18-crown-6 ether (DB18C6) and add [C 2 In mim][OTf] ionic liquid, leaching agent with DB18C6 concentration of 20mmol / L was obtained by ultrasonic oscillation at 40°C in a dry box for 15min, and 50mL of leaching agent and 20g of yellow phosphorus electrostatic precipitator ash were placed in the electrolytic cell, and passed Inject nitrogen to ensure that the whole system is in an inert environment. With the silver electrode as the cathode, the graphite electrode as the anode, and the silver wire electrode as the reference electrode, the cathode potential is controlled between the lower limit of the electrochemical window of the ionic liquid and the precipitation potential of metal potassium (- 2.0V~-1.7V vs.Ag), turn on the power at the same time, pass current to the electric wire wound outside the electrolytic cell to generate a magnetic field, and maintain the magnetic field strength at 0.3T. After leaching and electrolysis for 5 minutes, the...

Embodiment 2

[0029] Embodiment 2: Take dicyclohexyl and-18-crown ether-6 (DCH18C6) and add [C 2 In mim][OTf] ionic liquid, leaching agent with a DCH18C6 concentration of 20mmol / L was prepared by ultrasonic oscillation at 50°C for 15min in a drying oven. Inject nitrogen to ensure that the whole system is in an inert environment. With the silver electrode as the cathode, the graphite electrode as the anode, and the silver wire electrode as the reference electrode, the potential of the cathode electrode is controlled between the lower limit of the electrochemical window of the ionic liquid and the precipitation potential of metal potassium ( -2.0V~-1.7V vs.Ag), turn on the power at the same time, pass current to the electric wire wound outside the electrolytic cell to generate a magnetic field, and maintain the magnetic field strength at 0.5T. After leaching and electrolysis for 10 minutes, the cathode electrode starts Precipitate metal solid matter, after the cathode is completely covered by...

Embodiment 3

[0030] Embodiment 3: Take dicyclohexyl and-18-crown ether-6 (DCH18C6) and add [C 6 mim][NTf 2 ] in a drying oven at 45°C for 15 minutes by ultrasonic oscillation to obtain a leaching agent with a DB18C6 concentration of 15mmol / L. Put 50mL of the leaching agent and 20g of yellow phosphorus ESP ash into the electrolytic cell, and feed nitrogen to ensure that the entire system In an inert environment, with the silver electrode as the cathode, the graphite electrode as the anode, and the silver wire electrode as the reference electrode, the cathode potential is controlled between the lower limit of the electrochemical window of the ionic liquid and the precipitation potential of metal potassium (-2.0V~-1.7V vs.Ag), at the same time, turn on the power supply, pass current to the electric wire wound outside the electrolytic cell to generate a magnetic field, and maintain the magnetic field strength at 0.6T. After leaching and electrolysis for 30 minutes, metal solid substances begin...

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Abstract

The invention discloses a method for leaching recovery of high-purity potassium through electromagnetic strengthening of yellow phosphorus electric precipitator dust. According to the method, the yellow phosphorus electric precipitator dust serves as a raw material, and a mixture of a crown ether substance and ionic liquid serves as a leaching agent; in the presence of inert gases, magnetic fieldsand electric fields, potassium elements in the yellow phosphorus electric precipitator dust are completely leached out at normal temperature, high-purity metallic potassium is extracted through the electro-deposition method, and recovery and purification of the potassium elements in the yellow phosphorus electric precipitator dust are realized. Compared with common ionic liquid, the leaching agent adopted by the invention has better dissolving capacity and selective solubleness on potassium ions; meanwhile, it is ensured that the electrochemical window of the ionic liquid is wide, and the electric conductivity is good; the mass transfer process in the leaching process is accelerated through the additional electric fields and the additional magnetic fields, and the leaching efficiency is greatly improved. Compared with a common potassium preparation method, a great deal of energy consumption is reduced, a great quantity of raw materials are saved, and the risk in the potassium preparation process is reduced. Meanwhile, the yellow phosphorus electric precipitator dust is used as the raw material, and yellow phosphorus industrial waste is effectively recycled.

Description

technical field [0001] The invention relates to a leaching system and a method for recovering and purifying potassium element in yellow phosphorus electric dust removal ash by combining the system with electrodeposition. Background technique [0002] Yellow phosphorus is an important raw material for industrial production, widely used in chemical fertilizers, pharmaceutical reagents, detergents, fire retardants and other fields. Phosphorus chemical industry is an important pillar industry in my country's Yunnan, Guizhou and other provinces; in the production process of yellow phosphorus, the production of yellow phosphorus will generate a large amount of exhaust gas dust; through the function of electrostatic precipitator, each ton of yellow phosphorus can collect about 200kg of electrostatic precipitator dust . Based on this calculation, the annual collection of electric dust ash can reach more than 200,000 tons. Yellow phosphorus electric dust contains a large amount of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B26/10C25C3/02
CPCC22B7/02C22B26/10C25C3/02Y02P10/20
Inventor 瞿广飞赵驰宁平李军燕
Owner KUNMING UNIV OF SCI & TECH
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