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A kind of tin removal refining agent and its application

A technology of refining agent and application, which is applied in the field of tin removal refining agent, can solve the problems such as ineffective removal of harmful elements, reduction of cutting performance of lead brass products, etc., so as to improve comprehensive performance, improve ingot quality, fine Effect of melted ingot grains

Active Publication Date: 2016-06-15
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The article "Refining Slag Removal for High-Zinc Brass Smelting" ("Metallurgy Series" 2004, Vol.149, No.1, P19-21) mentioned a kind of borax-type deslagging used in factory brass processing scraps and old materials. Slag agent: borax: 42wt%, coke powder: 50wt%, sodium carbonate: 8wt%, which reduces the loss of metal elements and has a good covering effect, but the slag removal refining agent cannot effectively remove Fe in waste brass , Sn and other harmful elements; patent CN101514398A "a high rare earth content master alloy refining agent for refining waste miscellaneous copper and its preparation and application" discloses a Cu-RE-containing refining agent, which is effective for low melting point elements sulfur, phosphorus, tin, Impurity elements such as bismuth and lead have a certain removal effect, but they are mainly suitable for the refining and modification of red miscellaneous copper and miscellaneous cupronickel. The refining agent is not aimed at waste miscellaneous brass, and the effect is not obvious; Copper refining agent and its preparation method, mainly containing B, Mg and rare earth, mainly used for deoxidation, desulfurization, dehydrogenation and grain refinement in pure copper smelting process; patent CN102605193A discloses a refining agent for copper and copper alloy smelting , mainly used for degassing, heat preservation, refining and covering of copper, pure copper and its alloys
[0004] In summary, in the direct smelting of scrap copper to prepare free-cutting brass, there are few studies on the protection of beneficial elements and the effective removal of impurity elements in scrap copper.
However, the content of Sn element in scrap copper is relatively high, if it still contains more Sn element after smelting, it will greatly reduce the cutting performance of lead brass products

Method used

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  • A kind of tin removal refining agent and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 150g of CuMg alloy powder of 20 mesh to 100 mesh, 200g of CuP alloy powder, 100g of CuTi alloy powder, 200g of borax, 200g of sodium carbonate, and 150g of calcium carbonate. The moisture inside the mixture is covered with copper foil or copper tube, and pressed into blocks for later use.

[0023] Put 200kg scrap copper into the furnace, turn on the furnace and heat up for melting. After the scrap copper is completely melted, stir to make the slag inside the melt float to the surface, remove it, and add new covering agent. After that, press 1 kg (0.5% of the melt weight) of the previously prepared tin-removing refining agent into the inside of the brass melt to make it fully dissolve, supplemented by a certain amount of stirring, and then let the brass melt stand for 10 to 25 hours. Minutes, lower the furnace temperature appropriately, and remove the slag floating and accumulating on the upper surface of the melt and the covering agent added in the early stage to adsor...

Embodiment 2

[0025] 100g of CuMg alloy powder of 20 mesh to 100 mesh, 200g of CuP alloy powder, 150g of CuTi alloy powder, 150g of borax, 250g of sodium carbonate, and 150g of calcium carbonate. The moisture inside the mixture is covered with copper foil or copper tube, and pressed into blocks for later use.

[0026] Put 200kg scrap copper into the furnace, turn on the furnace and heat up for melting. After the scrap copper is completely melted, stir to make the slag inside the melt float to the surface, remove it, and add new covering agent. Afterwards, press 0.4kg (0.2% of the melt weight) of the previously prepared tin-removing refining agent into the inside of the brass melt to make it fully dissolve, supplemented by a certain amount of stirring, and then let the brass melt stand for 10 to 10 minutes. After 25 minutes, lower the furnace temperature appropriately, and remove the slag floating and accumulating on the upper surface of the melt and the covering agent added in the previous...

Embodiment 3

[0028]150g of CuMg alloy powder of 20 mesh to 100 mesh, 250g of CuP alloy powder, 150g of CuTi alloy powder, 150g of borax, 200g of sodium carbonate, and 100g of calcium carbonate. The moisture inside the mixture is covered with copper foil or copper tube, and pressed into blocks for later use.

[0029] Put 200kg scrap copper into the furnace, turn on the furnace and heat up for melting. After the scrap copper is completely melted, stir to make the slag inside the melt float to the surface, remove it, and add new covering agent. After that, press 2kg (1.0% of the melt weight) of the previously prepared tin-removing refining agent into the inside of the brass melt to fully dissolve it, supplemented by a certain amount of stirring, and then let the brass melt stand for 10 to 25 hours. Minutes, lower the furnace temperature appropriately, and remove the slag floating and accumulating on the upper surface of the melt and the covering agent added in the early stage to adsorb the o...

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Abstract

The invention relates to a tin removal refining agent and use thereof. The tin removal refining agent contains 10 to 25 weight percent of CuMg alloy powder, 15 to 25 weight percent of CuP alloy powder, 5 to 15 weight percent of CuTi alloy powder, 5 to 25 weight percent of borax, 5 to 25 weight percent of sodium carbonate and 5 to 20 weight percent of calcium carbonate. The tin removal refining agent can be used for lead brass prepared by melting scrap brass by the following steps of melting the scrap brass, removing slag on the surface of melt, pressing the tin removal refining agent into the scrap brass melt, performing uniform stirring after the refining agent is molten, standing the mixture for 10 to 25 minutes, removing slag, and performing batching and melting according to produced alloy trademarks to cast a lead brass ingot. According to the tin removal refining agent, the content of an impurity element Sn in the scrap brass can be effectively reduced, and influence of Sn on the cutting performance of a lead brass product is inhibited; oxide slag in the melt can be removed to improve the quality of the lead brass product.

Description

technical field [0001] The invention relates to a tin-removing refining agent and its application, in particular to a tin-removing refining agent used for smelting scrap brass to prepare leaded brass, and belongs to the technical field of non-ferrous metal processing. Background technique [0002] China is the world's largest copper consumer and the largest refined copper producer. With the continuous expansion of domestic refined copper production and consumption, the supply of copper raw materials has become a bottleneck factor restricting the development of China's copper industry. Due to the good regeneration performance of copper, compared with primary copper, scrap copper as a copper raw material has the advantages of energy saving, environmental protection, and economy. Therefore, scrap copper has become an important source of raw materials for the copper industry. The direct utilization of scrap brass in my country is: adopting the technology of large tonnage electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22B15/14
CPCY02P10/20
Inventor 向朝建李华清陈忠平张曦
Owner CHINALCO MATERIALS APPL RES INST CO LTD