Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for synchronous recovery of metals by using conductive ceramic membrane to enrich waste acid

A conductive ceramic and membrane enrichment technology, applied in chemical instruments and methods, diaphragms, electrodes, etc., can solve the problems of membrane fouling, membrane corrosion, inability to recover waste acid metals at the same time, and achieve high concentration, less waste acid impurities, The effect of improving the anti-pollution performance

Active Publication Date: 2020-10-27
KUNMING UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for enriching waste acid by using a conductive ceramic membrane under the action of an external electric field and synchronously recovering metals in the waste acid, so as to solve the problems of membrane pollution, membrane corrosion, and failure of the existing membrane technology to enrich waste acid. Simultaneous recovery of metals in waste acid, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for synchronous recovery of metals by using conductive ceramic membrane to enrich waste acid
  • Method and device for synchronous recovery of metals by using conductive ceramic membrane to enrich waste acid
  • Method and device for synchronous recovery of metals by using conductive ceramic membrane to enrich waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: The conductive ceramic membrane of this example is coated with a conventional commercially available tubular microfiltration ceramic membrane with conductive titanium dioxide, the thickness of the coating is 60 μm, and it is obtained after drying and sintering at 1300 ° C for 1 hour; the conductive ceramic membrane is used The waste water containing 3% mass concentration of nitric acid is treated, and the waste water contains 1500 mg / L copper ions.

[0030]In the method of the present invention, waste water containing nitric acid is placed in a cathode chamber formed by isolation of a tubular conductive ceramic membrane, dilute nitric acid with a mass concentration of 0.5% is placed in the anode chamber, and under the action of a DC voltage of 50V, electrolysis of water occurs around the electrodes; At the same time, under the action of DC voltage, the waste acid undergoes electrophoresis, and the particles with positive and negative charges move towards the c...

Embodiment 2

[0034] Example 2: A conventional tubular microfiltration ceramic membrane is coated with conductive barium sulfate, and the coating thickness is 40 μm. After drying, it is prepared by sintering at 1400° C. for 0.5 h. The conductive ceramic membrane is used to treat sulfuric acid wastewater containing 6% mass concentration, and the wastewater contains 800mg / L of zinc ions.

[0035] In the method of the present invention, sulfuric acid-containing wastewater is placed in a cathode chamber formed by isolation of a tubular conductive ceramic membrane, dilute sulfuric acid with a mass concentration of 1% is placed in the anode chamber, and under the action of a direct current voltage of 80V, a reaction of electrolyzed water is generated around the electrodes; At the same time, under the action of DC voltage, the waste acid undergoes electrophoresis, and the particles with positive and negative charges move towards the cathode and anode respectively; under the action of the electropho...

Embodiment 3

[0039] Example 3: The conventional flat-plate microfiltration ceramic membrane is coated with conductive mica powder, the coating thickness is 80 μm, and it is obtained after drying and sintering at 1350 ° C for 1 hour; Waste water is processed, and contains the ferrous ion of 600mg / L in the waste water.

[0040] In the method of the present invention, waste water containing nitric acid is placed in a cathode chamber formed by isolation of a flat conductive ceramic membrane, dilute nitric acid with a mass concentration of 0.6% is placed in the anode chamber, and under the action of a direct current voltage of 40V, electrolysis of water occurs around the electrodes; At the same time, under the action of DC voltage, the waste acid undergoes electrophoresis, and the particles with positive and negative charges move towards the cathode and anode respectively; The negative electrode connection of a DC power supply strengthens the polarization effect of the conductive ceramic membra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and device for enriching waste acid and synchronously recovering metals through a conductive ceramic film. The method comprises putting waste acid into a cathode chamber separated by a conductive ceramic film, putting a dilute acid into an anode chamber, and applying direct voltage to produce electrolysis of water around an electrode so that the waste acid produceselectrophoresis under direct voltage, wherein particles with positive and negative charges orientatedly move to the anode and cathode, in the electrophoresis electric field, the conductive ceramic film produces polarization effects and only allows the particles with negative charges to pass through and enter the anode chamber, the hydroxide ions in the anode chamber lose electrons at first and are oxidized into oxygen, simultaneously, an acid is formed in the anode chamber, the ions with positive charges move to the cathode and forms hydrogen at the positions around the cathode, simultaneously, the metal ions get electrons and are reduced into a metal element and the metal element is adhered to the cathode. The method and device fully perform acid corrosion resistance of the ceramic film.In the direct-current electric field, through conductive ceramic film polarization effects, in acid enrichment, the ceramic film pollution is effectively inhibited, metals in the waste acid are recovered and waste acid recycling is realized.

Description

technical field [0001] The invention belongs to the technical field of separation of functional ceramic membranes, and in particular relates to a method and a device for synchronously recovering metals by using conductive ceramic membranes to enrich waste acid. Background technique [0002] h 2 SO 4 、HNO 3 As a functional agent, it is widely used in wet leaching, catalysis, chemical bath anodizing, chemical polishing, electroless plating, chemical bath pickling, etc., resulting in a large amount of waste acid. These waste acids are low in concentration, complex in composition, highly corrosive, and contain a variety of metals. If these waste acids are discharged directly into the water environment without treatment, it will inevitably cause great harm. Waste acid treatment has always been a challenge faced by production enterprises. right question. At present, production enterprises mainly use lime neutralization precipitation method, incineration method, evaporation con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D63/00B01D61/42C25C7/04C25C7/02C25C7/00C25C1/00
CPCY02P10/20
Inventor 瞿广飞杜彩东解若松高海均宁平
Owner KUNMING UNIV OF SCI & TECH