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A method for reducing bismuth content in brass

A technology of content and brass, applied in the field of non-ferrous metal material processing and manufacturing, can solve the problems of difficulty in recycling and recycling bismuth-containing brass, cracking of ingots, etc., and achieve significant economic and social benefits, low processing cost, and bismuth removal effect. Good results

Active Publication Date: 2017-09-19
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of recycling waste brass, bismuth brass is easily indistinguishable from ordinary brass mixture, and it is sent to processing plants as ordinary brass waste for melting and casting, because the melting point of bismuth (271°C) is much lower than that of copper Zinc is distributed on the grain boundary of the brass ingot during the solidification process, and the ingot cracks and produces waste products during the processing process, which brings great difficulties to the recycling of bismuth-containing brass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In order to investigate the effect, the bismuth content of the old brass materials was first detected, and the bismuth content of this batch of old brass materials was measured to be 0.84%. The additive is composed of 70% by weight of main material, 20% by weight of auxiliary material and 10% by weight of second auxiliary material. The impurity remover is selected from sodium fluoride, calcium fluoride can also be selected, or sodium fluoride and calcium fluoride can be mixed in any proportion. Graphite sheets are selected as the covering agent, or powdered graphite, or charcoal, borax, cryolite, one of which can be used, or several kinds can be mixed in any proportion before use.

[0025] Proceed as follows:

[0026] 1) Add bismuth brass old material into the smelting furnace, heat up and melt;

[0027] 2) Use graphite flakes as a covering agent to cover the old brass melt, and the thickness of the covering agent is 30 mm;

[0028] 3) Add the prepared additives, the...

Embodiment 2

[0035] The bismuth content of this batch of old brass materials is 0.84%. Prepare the additive, use the main material that is 70% by weight, the auxiliary material that is 10% by weight and the additive that the second auxiliary material that weight percentage is 20%. The impurity remover is selected from sodium fluoride, calcium fluoride can also be selected, or sodium fluoride and calcium fluoride can be mixed in any proportion. Graphite sheets are selected as the covering agent, or powdered graphite, or charcoal, borax, cryolite, one of which can be used, or several kinds can be mixed in any proportion before use.

[0036] Proceed as follows:

[0037] 1) Add bismuth brass old material into the smelting furnace, heat up and melt;

[0038] 2) Use graphite flakes as a covering agent to cover the old brass melt, and the thickness of the covering agent is 50 mm;

[0039] 3) Add the prepared additives, the addition amount is 1.5% of the weight of the old brass material, melt a...

Embodiment 3

[0046] The content of bismuth in this batch of old brass materials is 0.78%. Prepare additive, use the main material that is 60% by weight percentage, the auxiliary material that weight percentage is 30% and the additive that the second auxiliary material that weight percentage is 10% is formed. The impurity remover is selected from sodium fluoride, calcium fluoride can also be selected, or sodium fluoride and calcium fluoride can be mixed in any proportion. Graphite sheets are selected as the covering agent, or powdered graphite, or charcoal, borax, cryolite, one of which can be used, or several kinds can be mixed in any proportion before use.

[0047] Proceed as follows:

[0048] 1) Add bismuth brass old material into the smelting furnace, heat up and melt;

[0049] 2) Use graphite flakes as a covering agent to cover the old brass melt, and the thickness of the covering agent is 50 mm;

[0050] 3) Add the prepared additives, the addition amount is 2.5% of the weight of th...

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Abstract

The invention discloses a method for reducing the content of bismuth in brass. The method is a method for reducing the content of bismuth in brass and thereby eliminating the deleterious effect and reclaiming use of bismuth. The method is characterized in that a bismuth-reducing additive capable of being combined with bismuth to form a compound such as BixMey is added to a brass alloy, the formed compound is removed as an impurity from a melt through a high-temperature physical metallurgical method, and the purposes that the content of bismuth in a brass alloy matrix is lowered and the alloy structure and processing performance of the alloy are improved are achieved.

Description

technical field [0001] The invention relates to a recycling treatment method for bismuth-containing brass, in particular to a method for reducing bismuth content in recycled brass materials, and relates to the field of non-ferrous metal material processing and manufacturing. Background technique [0002] Lead brass has good cutting performance and low price advantages, and has been widely used at home and abroad. However, lead brass contains 1 to 3% heavy metal lead, which poses a great threat to the human living environment. In recent years, with the continuous enhancement of people's awareness of environmental protection, the application of lead brass has been restricted by most countries at home and abroad, especially in developed countries. Replacing lead with non-toxic or low-toxic substances is the main way to reduce lead pollution. At present, most of the lead-free brass developed at home and abroad use bismuth as the main alloying element, such as patents: 2007100984...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C9/00
CPCC22C1/06C22C9/00
Inventor 蔡薇柳瑞清赵红彬裴勇军郑少锋易志勇
Owner JIANGXI UNIV OF SCI & TECH