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Copper alloy pipe fusion covering agent

A covering agent and copper alloy technology, applied in the field of copper smelting, can solve problems such as difficulty in satisfying high-quality copper and copper alloy products, lower copper conductivity, expensive lithium melt, etc., to achieve guaranteed composition and performance, high surface tension , to promote the effect of floating

Inactive Publication Date: 2015-05-06
浙江同诚合金铜管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, methods for removing hydrogen during refining of copper and copper alloys include inert gas dehydrogenation, oxidation dehydrogenation and flux dehydrogenation, etc., but there are problems such as high cost and low efficiency of dehydrogenation equipment
Common deoxidation methods include phosphorus, lithium, boron, magnesium, etc., and the presence of phosphorus during deoxidation will strongly reduce the conductivity of copper. Lithium is expensive and easy to re-absorb hydrogen from the melt. The deoxidation effect of boron is poor, and magnesium causes inclusions. Dehydrogenation and deoxidation refining technologies for copper are difficult to meet the requirements of high-quality copper and copper alloy products

Method used

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  • Copper alloy pipe fusion covering agent

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Experimental program
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Effect test

Embodiment 1

[0018] The copper alloy tube smelting covering agent in this embodiment is composed of the following components in parts by mass: 8 parts of aluminum sulfate, 5 parts of silica sand, 12 parts of calcium fluoride, 12 parts of medical stone, and 15 parts of sodium fluoroaluminate , 10 parts of bentonite, 8 parts of fluorite.

[0019] The above copper alloy tube smelting covering agent comprises the following preparation steps:

[0020] (1) Soak the above-mentioned fluorite and medical stone in 8% sulfuric acid for 8 hours, wash with deionized water, soak in 12% sodium hydroxide solution for 5 hours, wash with deionized water until neutral, and then Calcined at 550°C for 2 hours, broken into fragments with a particle size of 1-3mm;

[0021] (2) Add the aluminum sulfate, silica sand, and calcium fluoride in the above mass fractions into 1.2g / L potassium permanganate solution for soaking to remove impurities, then filter and wash to become neutral, and calcinate at 400°C for 2 hou...

Embodiment 2

[0026] The copper alloy tube smelting covering agent in this embodiment is composed of the following components in parts by mass: 16 parts of aluminum sulfate, 10 parts of silica sand, 25 parts of calcium fluoride, 20 parts of medical stone, and 26 parts of sodium fluoroaluminate , 30 parts of bentonite, 20 parts of fluorite.

[0027] The above copper alloy tube smelting covering agent comprises the following preparation steps:

[0028] (1) Soak the above-mentioned fluorite and medical stone in 12% sulfuric acid for 5 hours, wash with deionized water, soak in 10% sodium hydroxide solution for 8 hours, wash with deionized water until neutral, and then Calcined at 800°C for 2 hours, broken into fragments with a particle size of 1-3mm;

[0029] (2) Add the aluminum sulfate, silica sand, and calcium fluoride in the above mass fractions into 1.2g / L potassium permanganate solution for soaking to remove impurities, then filter and wash to become neutral, and calcinate at 400°C for 2...

Embodiment 3

[0034] The copper alloy tube smelting covering agent in this embodiment is composed of the following components in parts by mass: 12 parts of aluminum sulfate, 8 parts of silica sand, 18 parts of calcium fluoride, 16 parts of medical stone, and 20 parts of sodium fluoroaluminate , 20 parts of bentonite, 14 parts of fluorite.

[0035] The above copper alloy tube smelting covering agent comprises the following preparation steps:

[0036] (1) Soak the above-mentioned fluorite and medical stone with 10% sulfuric acid for 6 hours, wash with deionized water, then soak with 11% sodium hydroxide solution for 7 hours, then wash with deionized water until neutral, and then Calcined at 700°C for 2 hours, broken into fragments with a particle size of 1-3mm;

[0037] (2) Add the aluminum sulfate, silica sand, and calcium fluoride in the above mass fractions into 1.2g / L potassium permanganate solution for soaking to remove impurities, then filter and wash to neutral, and calcinate at 400-4...

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Abstract

The invention relates to a copper alloy pipe fusion covering agent. The copper alloy pipe fusion covering agent comprises the following components in parts by weight: 8-16 parts of aluminum sulfate, 5-10 parts of silica sand, 12-25 parts of calcium fluoride, 12-20 parts of medical stone, 15-26 parts of sodium fluoroaluminate, 10-30 parts of bentonite and 8-20 parts of fluorite. The fusion covering agent integrates the functions of deoxidizing, degassing and impurity-eliminating and has a strong absorbing, dissolving and combined slagging ability, and is capable of deoxidizing the oxide inclusion in the copper alloy melting solution and eliminating the hydrogen, oxide and metal oxide absorbed on the oxide inclusion. Because the surface tension between the copper alloy tube fusion covering agent and the fuse element is high, the slag can be promoted to float and flow, and the slag is preferably separated from the copper solution, and then the effects of refining and impurity-eliminating and fuse element purifying can be obtained. The copper alloy tube fusion covering agent is strong in chemical stability and heat stability without corrosive effect on the copper solution and the furnace lining so that the original components and the performances of the alloy can be kept, besides, the copper alloy tube fusion covering agent is pollution-free, safe, environmentally friendly, convenient to use and cheap in price.

Description

technical field [0001] The invention relates to a copper alloy pipe smelting covering agent, which belongs to the technical field of copper smelting. Background technique [0002] Copper and copper alloys often contain impurity elements such as hydrogen, oxygen, sulfur, lead, bismuth and arsenic during the smelting process. These impurity elements have a great influence on the thermal conductivity and processing performance of copper. For example, oxygen and sulfur are easy to cause "cold brittleness" of castings, lead and bismuth are easy to cause "hot brittleness" of materials, and hydrogen is the most common and most harmful gas in copper, which will cause a large number of foaming in the pipe and cause serious quality accidents. Adding an appropriate amount of smelting covering agent during the smelting process of copper and copper alloy can play the role of degassing, slag removal and grain refinement. [0003] At present, the methods for removing hydrogen during refin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C9/00
Inventor 杜小秋郑晓飞徐灿林徐兆元
Owner 浙江同诚合金铜管有限公司
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