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

Method for treating slag in copper-phosphorus brazing filler metal

A technology of copper-phosphorus solder and processing method, applied in welding/cutting medium/material, welding medium, manufacturing tool, etc., can solve the problems of cracking, decrease in strength of brazing seam, lowering yield of copper-phosphorus solder, etc., and achieve separation Good effect, improved reduction efficiency, high adsorption efficiency

Active Publication Date: 2019-10-11
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When liquid copper-phosphorus solder is cast, slag is easy to form non-metallic inclusions on the surface or inside of the ingot, which affects the subsequent extrusion and drawing processes and reduces the yield of copper-phosphorus solder
More importantly, during the brazing process, the non-metallic inclusions contained in the copper-phosphorus solder enter the brazing seam, and when the copper-phosphorus brazing alloy melts and solidifies quickly, it will remain in the brazing seam before it can float out. Slag inclusions are formed, and under the action of stress on the brazed joint, cracks will first appear at the slag inclusions in the brazing joint and develop along the way, resulting in a decrease in the strength of the brazing joint and cracking

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 for treating slag in copper-phosphorus brazing filler metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The solder brand is BCu93P, which is the largest in the market, weighs 300kg per furnace and is smelted in 50 furnaces. After covering the slag with sawdust, 84.6 kg of scum is obtained after separation. After the scum is solidified and cooled, the scum is ball milled into scum powder by a ball mill, and the particle size of the scum powder after ball milling is 80-140 mesh. Prepare a certain concentration of acid solution, in which hydrochloric acid accounts for 20% and nitric acid accounts for 30%. Add the scum powder and stir continuously at 80°C until it is completely dissolved and the activated carbon powder floats on the surface of the solution. The activated carbon powder is filtered out and dried to a humidity of 1% to 5% to obtain 25.3 kg of activated carbon powder. The scum waste liquid is neutralized with a 48% potassium hydroxide solution to a pH value of 8.0-9.0, and the neutralization process is stopped, and a large amount of copper hydroxide precipitation...

Embodiment 2

[0032] The solder brand is BCu93P, which is the largest in the market, weighs 300kg per furnace and is smelted in 50 furnaces. After covering the slag with sawdust, 81.4 kg of scum is obtained after separation. After the scum is solidified and cooled, the scum is ball milled into scum powder by a ball mill, and the particle size of the scum powder after ball milling is 80-140 mesh. Prepare a certain concentration of acid solution, in which hydrochloric acid accounts for 20% and nitric acid accounts for 30%. Add the scum powder and stir continuously at 80°C until it is completely dissolved and the activated carbon powder floats on the surface of the solution. The activated carbon powder is filtered out and dried to a humidity of 1% to 5% to obtain 21.2 kg of activated carbon powder. The scum waste liquid is neutralized with a 48% potassium hydroxide solution to a pH value of 8.0-9.0, and the neutralization process is stopped, and a large amount of copper hydroxide precipitation...

Embodiment 3

[0034] The solder brand is BCu93P, which is the largest in the market, weighs 300kg per furnace and is smelted in 50 furnaces. After covering the slag with sawdust, 85.3 kg of scum is obtained after separation. After the scum is solidified and cooled, the scum is ball milled into scum powder by a ball mill, and the particle size of the scum powder after ball milling is 80-140 mesh. Prepare a certain concentration of acid solution, in which hydrochloric acid accounts for 20% and nitric acid accounts for 30%. Add the scum powder and stir continuously at 80°C until it is completely dissolved and the activated carbon powder floats on the surface of the solution. The activated carbon powder is filtered out and dried to a humidity of 1% to 5% to obtain 23.7 kg of activated carbon powder. The scum waste liquid is neutralized with a 48% potassium hydroxide solution to a pH value of 8.0-9.0, and the neutralization process is stopped, and a large amount of copper hydroxide precipitation...

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 provides a method for treating slag in copper-phosphorus brazing filler metal. The method comprises the following steps that (1) in a slag adsorption process, a layer of saw dust is covered on the surface of the liquid copper-phosphorus brazing filler metal to form dross after being adsorbed; (2) in a slag and activated carbon separation process, dross powder is added into an acid solution, and activated carbon powder is filtered out after the mixture is fully dissolved; (3) in a recycling process of P2O5 in the slag, a potassium hydroxide solution is adopted for neutralizing thedross powder obtained in the step (2), a copper hydroxide precipitate is filtered out, and heating is conducted on the filtered solution to separate out crystals and obtain a compound fertilizer containing elements such as phosphorus, potassium and copper; and (4) in a process for recovering copper oxide from the slag, high-temperature calcination is carried out on the copper hydroxide precipitate to generate copper oxide powder, and the copper oxide powder and the activated carbon powder are put into a ball mill for ball milling to obtain liquid copper. According to the method, the production and processing cost of the copper-phosphorus brazing filler metal is saved, the additional economic benefit is increased at the same time, and a circular economy industrial chain is formed.

Description

Technical field [0001] The invention relates to the technical field of recycling and utilization of slag in copper-phosphorus solder, in particular to the field of solid waste treatment and resource utilization, and in particular to a method for processing slag in copper-phosphorus solder. Background technique [0002] During the smelting process, the copper in the copper-phosphorus brazing filler metal produces copper oxide at high temperatures, and phosphorus plays a role in reducing the copper oxide. Reduction product P 2 O 5 It forms a composite compound with copper oxide and covers the surface of the copper-phosphorus melt in the form of slag at the melting temperature. When the liquid copper-phosphorus solder is cast, the slag easily forms non-metallic inclusions on the surface or inside of the ingot, which affects the subsequent extrusion and drawing processes, and reduces the yield of the copper-phosphorus solder. More importantly, the non-metallic inclusions contained i...

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
IPC IPC(8): B23K35/40C22C1/02
CPCB23K35/40C22C1/02
Inventor 张雷郝庆乐沈元勋钟素娟董博文程亚芳郭艳红秦建常云峰
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD