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Method for preparing cuprous oxide powder by copper-contained electroplating sludge pressurizing hydrogen reduction

A technology of cuprous oxide and electroplating sludge, which is applied in chemical instruments and methods, copper oxide/copper hydroxide, sludge treatment, etc. Simple operation and the effect of reducing environmental pollution

Inactive Publication Date: 2010-12-29
NANTONG HAICHENG SPOKE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of the single recovery product of the above-mentioned electroplating sludge, and provide a method for obtaining cuprous oxide powder from copper-containing electroplating sludge with mild reaction conditions and low cost

Method used

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  • Method for preparing cuprous oxide powder by copper-contained electroplating sludge pressurizing hydrogen reduction
  • Method for preparing cuprous oxide powder by copper-contained electroplating sludge pressurizing hydrogen reduction
  • Method for preparing cuprous oxide powder by copper-contained electroplating sludge pressurizing hydrogen reduction

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Embodiment 1）

[0028] See figure 1 , the method for preparing cuprous oxide powder by pressurized hydrogen reduction of copper-containing electroplating sludge of the present embodiment comprises the following steps:

[0029] ①Pretreatment: Dry 100kg of copper-containing electroplating sludge in a sludge dryer at 120°C for 2 hours, then grind the dried sludge in a grinder, pass through a 200-mesh sieve, and remove large particles and sand grain.

[0030] See Table 1, the metal and its content in the copper-containing electroplating sludge after the above-mentioned drying are shown in the following table:

[0031] Table 1 Main components and content of copper-containing electroplating dry sludge

[0032] Element

Ni

Cu

Zn

Cr

Mg

Fe

Ca

Copper-containing electroplating sludge (%)

0.0053

16.4

0.005

0.004

1.33

0.723

10.8

[0033] ②Ammonia leaching: Transfer the electroplating sludge pretreated in step ① to the reaction tank...

Embodiment 2）

[0041] The electroplating sludge treated in this embodiment is the same as in Example 1, and the method for preparing cuprous oxide powder by pressurized hydrogen reduction of copper-containing electroplating sludge in this embodiment differs from the method in Example 1 in that:

[0042] Step 2. In the reaction tank, adding concentration is 900 liters of ammoniacal liquor and 600 kilograms of ammonium sulfate solids of 10 mol / L, wherein n(NH 3 ·H 2 O): n((NH 4 ) 2 SO 4 ) = 2:1, the mass ratio of ammonia water (referring to the aqueous solution of ammonium hydroxide) to copper-containing electroplating sludge, that is, the liquid-solid ratio is 8.4:1.

[0043] In step ③, when the pressurized hydrogen reduction reaction is carried out, after the solution is loaded into the autoclave, the lid of the autoclave is covered, nitrogen is introduced to replace the air in the autoclave, and then hydrogen is introduced to replace the nitrogen in the autoclave; then continue to introd...

Embodiment 3）

[0045] The electroplating sludge treated in this embodiment is the same as in Example 2, and the method for preparing cuprous oxide powder by pressurized hydrogen reduction of copper-containing electroplating sludge in this embodiment differs from the method in Example 2 in that:

[0046] In step ③, add 10% sulfuric acid solution to the leaching solution obtained in step ② and mix evenly until the pH value of the leaching solution is 6.2, put the solution in the autoclave and cover the kettle lid, first pass in nitrogen to replace the air in the kettle, Pass into hydrogen again, replace the nitrogen in the still; Then continue to pass into hydrogen until the pressure in the still rises to 2MPa, stop ventilation and open the magnetic stirring device at this moment, set the rotating speed to be 500r / min, turn on the heating device again, until the temperature rises to 140°C, and when the pressure in the kettle begins to drop, start timing, and react for 60 minutes. During the rea...

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Abstract

The invention discloses a method for preparing cuprous oxide powder by copper-contained electroplating sludge pressurizing hydrogen reduction, which comprises the steps of pretreatment, ammonia leaching, pressurizing hydrogen reduction, residue solidification, and the like. The method comprises the following concrete steps of: before pressurizing hydrogen reduction reaction, adjusting a pH value of reaction mixing liquid to 6.0-7.0, maintaining hydrogen pressure of 2-2.5MPa, the temperature of 130-160 DEG C and the rotating speed of 400-600r / minute in a high-pressure kettle, reacting for 50-90 minutes, opening and cooling to room temperature and taking a product out of the kettle; and filtering and separating sediments from a solution and washing the obtained sediments with deionized water and drying to obtain Cu2O powder. The invention realizes resource utilization, reduces the pollution of copper-contained electroplating sludge on environment, prepares the Cu2O powder by controlling the cuprous reducing condition, has mild reaction condition and lower cost and increases the category of copper products recycled from the electroplating sludge.

Description

technical field [0001] The invention relates to a method for recovering valuable metals from electroplating sludge, in particular to a method for preparing Cu from copper-containing electroplating sludge. 2 O powder method. Background technique [0002] The electroplating industry is an indispensable basic industry in the national economy, and it is also one of the three major polluting industries in the world today. The solid waste generated by the electroplating industry is mainly electroplating sludge, which is classified as hazardous waste because of its high mass fraction of heavy metals. In recent years, the number of electroplating enterprises in my country has grown rapidly, and most of the electroplating enterprises are small in scale, outdated in equipment, and low in management, resulting in a large amount of sludge and complex components. [0003] Industries such as electroplating, metallurgy, and chemical industry will produce a large amount of electroplating ...

Claims

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Application Information

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IPC IPC(8): C02F11/00C01G3/02C02F103/16
Inventor 程洁红周全法陈娴刘玉海孔峰张锁荣朱炳龙
Owner NANTONG HAICHENG SPOKE
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