Process for removing Ni from waste etching FeCl3 solution containing Ni

A technology for ferric chloride corrosion and waste liquid, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of inability to completely separate ferronickel and high price, and achieve Low cost, small equipment investment and high efficiency

Inactive Publication Date: 2002-12-25
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The deficiency of existing iron powder reduction method is: need to use the more expensive iron powder in the technology, can't re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Treatment of nickel-containing ferric chloride etching waste liquid produced by a display shadow mask manufacturer,

[0022] Composition of nickel-containing ferric chloride etching waste liquid: Fe 3+ : 212.6g / L

[0023] Fe 2+ : 4.92g / L

[0024] Ni 2+ : 22.97g / L

[0025] h + : 0.1g / L

[0026] Add 4000L of waste liquid to the reaction tank, add 2000L of water, and add 446Kg of -100 mesh iron powder in 25 minutes in four times. From the beginning of adding iron powder, after reacting for 60 minutes, analyze the concentration of nickel in the solution. Then heat the reaction mixture to 90°C, add -100 mesh iron powder 247Kg and -325 mesh sulfur powder 141Kg twice, stir and react at 90-95°C for 90 minutes, filter, and send the filter residue to the nickel sulfate production section. Heat the mother liquor to 90°C, add -100 mesh iron powder 5Kg and -325 mesh sulfur powder 3Kg at a time, sti...

Embodiment 2

[0027] Add 4000L of waste liquid to the reaction tank, add 2000L of water, add 480Kg of -100 mesh iron powder in four times within 25 minutes, start timing from the beginning of adding iron powder, and analyze the Ni in the solution after 40 minutes of reaction. 2+ concentration. The temperature of the reaction mixture was raised to 90°C, and 494Kg of -100 mesh iron powder and 141Kg of -325 mesh sulfur powder were added twice, stirred and reacted at 90-95°C for 90 minutes, filtered, and the filter residue was sent to the nickel sulfate production section. Heat the mother liquor to 90°C, add -100 mesh iron powder 5Kg and sodium arsenite 3Kg at a time, stir and react at 90-95°C for 90 minutes, filter, and Ni in the mother liquor 2+ Concentration is less than 10ppm, sent to the chlorination section to produce liquid ferric chloride. Embodiment three: process the same nickel-containing ferric chloride etching waste liquid as embodiment one

Embodiment 3

[0027] Add 4000L of waste liquid to the reaction tank, add 2000L of water, add 480Kg of -100 mesh iron powder in four times within 25 minutes, start timing from the beginning of adding iron powder, and analyze the Ni in the solution after 40 minutes of reaction. 2+ concentration. The temperature of the reaction mixture was raised to 90°C, and 494Kg of -100 mesh iron powder and 141Kg of -325 mesh sulfur powder were added twice, stirred and reacted at 90-95°C for 90 minutes, filtered, and the filter residue was sent to the nickel sulfate production section. Heat the mother liquor to 90°C, add -100 mesh iron powder 5Kg and sodium arsenite 3Kg at a time, stir and react at 90-95°C for 90 minutes, filter, and Ni in the mother liquor 2+ Concentration is less than 10ppm, sent to the chlorination section to produce liquid ferric chloride. Embodiment three: process the same nickel-containing ferric chloride etching waste liquid as embodiment one

[0028] Add 4000L of waste liquid to t...

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Abstract

A process for removing Ni from the used etching Ni-containing FeCl3 solution includes adding iron powder or fraky iron scales, reduction reaction, heating to 55-95 deg.C, adding iron powder and sulfur powder, precipitating 2-valence Ni, adding iron powder and sulfur or As compound or Sb compound for further precipitation, and filtering. Its advantages are high effect on recovering Ni and regenerating FeCl3 solution and low cost.

Description

technical field [0001] The invention relates to a method for removing nickel from nickel-containing ferric chloride etching waste liquid. Background technique [0002] Ferric chloride FeCl 3 It is often used as an etchant in the production of printed circuit boards and picture tubes for monitors and televisions. In the production of kinescope shadow masks, during the etching process, FeCl 3 Reduction of etched metal iron and nickel to FeCl 2 , metallic nickel is also Ni 2+ form into the etching solution, as the etching process proceeds, FeCl 3 As the concentration gradually decreases, the etching efficiency also decreases. Therefore, the etchant must be replaced periodically, with fresh FeCl 3 The etching solution replaces the old etching solution, and the used etching waste solution is discharged from the system. The Fe in this etching waste solution 2+ It can be regenerated by chlorine oxidation, but the etching waste liquid also contains a considerable amount of Ni...

Claims

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Application Information

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IPC IPC(8): C02F1/62C23F1/46
Inventor 陈志传毛谙章覃祚观郑嘉辉秦建武
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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