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A method for removing tin on the surface of tin-plated copper strip and tin-removing additive

A technology of tinned copper strip and tin additive is applied in the field of metal material processing, which can solve the problems of environmental pollution and secondary pollution discharge, and achieve the effects of no secondary pollution, low treatment cost and simple tin removal process.

Active Publication Date: 2019-05-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical process methods need to use a large amount of chemical reagents such as acids, alkalis, and salts, resulting in secondary pollution discharges (waste water, waste gas, waste impurities), causing serious pollution to the environment, which is strictly restricted by the national environmental protection policy

Method used

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  • A method for removing tin on the surface of tin-plated copper strip and tin-removing additive
  • A method for removing tin on the surface of tin-plated copper strip and tin-removing additive
  • A method for removing tin on the surface of tin-plated copper strip and tin-removing additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add the reclaimed tin-plated copper strip sample with a cut coating thickness of about 5 μm to the heating furnace with tin-removing additives, add charcoal as a covering agent, control the heating temperature to 350°C, hold the holding time for 120 minutes, cool and stand for 10 minutes, and separate , cleaning, sampling. Other covering agents can also be used; choosing charcoal as the covering agent can use the reducibility of C to reduce the oxygen content in the heating furnace and prevent the copper strip from being oxidized after tin removal.

[0038] Described tin-removing additive comprises the component of following weight content:

[0039] Sodium chloride 60%; calcium fluoride 0%; sodium fluoride 20%; cryolite 20%; graphite powder 0%.

[0040] It can be seen from the photo of the treated sample that a small amount of black tin oxide remains on the surface of the sample treated by this embodiment, and most of the tin plating layer has been removed.

Embodiment 2

[0042] Add the reclaimed tin-plated copper strip sample with a slit coating thickness of about 5 μm to the heating furnace with tin-removing additives, add charcoal as a covering agent, control the heating temperature to 500°C, hold the temperature for 90 minutes, cool and stand for 10 minutes, separate, Clean up, sample.

[0043] Described tin-removing additive comprises the component of following weight content:

[0044] Sodium chloride 40%; Calcium fluoride 10%; Sodium fluoride 25%; Cryolite 25%; Graphite powder 0%.

[0045] It can be seen from the photo of the treated sample that a small amount of black tin oxide remains on the surface of the sample treated by this embodiment, and most of the tin plating layer has been removed.

Embodiment 3

[0047] Add the reclaimed tin-plated copper strip sample with a slit coating thickness of about 5 μm to the heating furnace with tin-removing additives, add charcoal as a covering agent, control the heating temperature to 550 ° C, hold the temperature for 90 minutes, cool and stand for 10 minutes, separate, Clean up, sample.

[0048] Described tin-removing additive comprises the component of following weight content:

[0049] Sodium chloride 50%; Calcium fluoride 0%; Sodium fluoride 20%; Cryolite 20%; Graphite powder 10%.

[0050] It can be seen from the photos of the treated samples that a very small amount of tin oxide remains on the surface of the samples treated by this embodiment, and most of the tin plating layer has been removed.

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PUM

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Abstract

The invention discloses a method for removing a tinned layer on a surface of a tinned copper strip. The method comprises the following steps: (1) adding the cut tinned copper strip and a tin removing additive into a heating furnace; and (2) adding a covering agent, maintaining the temperature for 60-150 min at 300-550 DEG C, cooling and separating the tinned copper strip and the tinned layer, and cleaning to obtain the copper strip from which tin is removed. According to the method, the technical problem of removing and recycling of tin in an existing recovered tinned copper strip can be overcome; the tinned layer and the copper strip are separated during heating at an intermediate temperature, thus achieving the purpose of removing tin on the tinned copper strip. The method has the characteristics of low cost and short process; the secondary pollution to the environment is avoided; and the recovered tinned copper strip can be recycled.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a method for treating tin elements in recycled materials of tinned copper strips. Background technique [0002] Copper and copper alloy strips have good mechanical, physical and chemical properties, and are widely used in electronic and electrical components at home and abroad. Plating 3-8μm tin on the surface of the strip can improve the surface hardness and corrosion resistance to reduce the contact resistance. It has been widely used in the manufacture of socket connector products for electronic appliances. [0003] With the shortage of copper resources, the domestic copper processing industry uses a large number of waste electronic and electrical products imported from abroad and waste tinned copper strips recovered in the production process to reprocess and manufacture copper and copper alloy products (such as strips, wires, bars, etc.) Wait). Due to the different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F4/04
CPCC23F4/04
Inventor 蔡薇柳瑞清易志勇
Owner JIANGXI UNIV OF SCI & TECH
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