A vacuum induction melting method for copper-manganese master alloy with high manganese content

A vacuum induction smelting and intermediate alloy technology, applied in the field of vacuum metallurgical smelting, can solve the problems of low Gibbs free energy of manganese oxides, manganese oxide inclusions, and low smelting yield, so as to avoid oxidation and slagging Phenomenon, reduction of oxidation, effect of reducing oxygen content

Active Publication Date: 2019-07-09
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method of domestic production of CuMn22 and CuMn28 master alloys is non-vacuum smelting. This method has many shortcomings in the preparation of CuMn22 and CuMn28 master alloys: (1) Even if a covering agent and a deoxidizer are added during the smelting process, the non-vacuum melting The environment is still easy to cause the oxidation of copper and manganese during the smelting process; (2) the Gibbs free energy of manganese oxides is low and cannot be decomposed by deoxidizer reduction, so there are a large number of manganese oxide inclusions in the alloy; (3) The oxidation of copper and manganese will also cause the burning loss of elements, and the actual yield of smelting is low
The smelting yield rate of the copper-manganese master alloy produced by this method is only 95%-96%, and the remaining 4%-5% of the copper-manganese master alloy forms slag and is wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Put 8.16kg TU1 red copper rod and 3.84kg electrolytic manganese as raw materials into the crucible of the vacuum induction melting furnace, and vacuumize the vacuum induction melting furnace once to 10Pa, and then put it under the condition of 600℃~650℃ The raw material is preheated for 20 minutes; the mass purity of the copper rod and the electrolytic manganese are both 99.95%; the crucible is a prefabricated magnesium oxide crucible with a mass purity of 96%; Fill the argon gas with a mass purity of 99.99% until the pressure in the vacuum induction melting furnace is -0.05Mpa, and then perform a second vacuuming to 10Pa. The number of argon gas filling is 3 times, each time Finally, vacuumize the vacuum induction melting furnace;

[0027] Step 2. When the vacuum degree in the vacuum induction melting furnace is reduced to 1 Pa, heat the preheated raw materials in Step 1 until they are completely melted, a...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] Step 1. Put 7.2kg TU1 red copper rods and 4.8kg electrolytic manganese as raw materials into the crucible of the vacuum induction melting furnace, and vacuumize the vacuum induction melting furnace once to 10Pa, and then heat the furnace at a temperature of 750°C to 800°C. The raw material is preheated for 5 minutes; the mass purity of the copper rod and the electrolytic manganese are both 99.95%; the crucible is a prefabricated magnesium oxide crucible with a mass purity of 96%; The pressure of argon gas with a mass purity of 99.99% to the vacuum induction melting furnace is -0.06Mpa, and then a second vacuum is carried out to 8Pa. The number of argon gas filling is 2 times. The vacuum induction melting furnace is vacuumed;

[0034] Step 2. When the vacuum degree in the vacuum induction melting furnace is reduced to 1 Pa, heat the preheated raw materials in Step 1 until they are completely melted, and refine them ...

Embodiment 3

[0039]Step 1. Put 6.6kg TU1 red copper rod and 5.4kg electrolytic manganese as raw materials into the crucible of the vacuum induction melting furnace, and evacuate the vacuum induction melting furnace to 10Pa once, and then put it under the condition of 750℃~800℃ The raw material is preheated for 5 minutes; the mass purity of the copper rod and the electrolytic manganese are both 99.95%; the crucible is a prefabricated alumina crucible with a mass purity of 96%; The pressure of argon gas with a mass purity of 99.99% to the vacuum induction melting furnace is -0.06Mpa, and then the second vacuum is carried out to 5Pa, and the number of times that the argon gas is filled is 3 times. The vacuum induction melting furnace is vacuumed;

[0040] Step 2. When the vacuum degree in the vacuum induction melting furnace is reduced to 1 Pa, heat the preheated raw materials in Step 1 until they are completely melted, and refine them for 1 min at a temperature of 1200° C. to obtain a copper...

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Abstract

The invention discloses a vacuum induction smelting method for a high-manganese-content copper-manganese intermediate alloy. The method comprises the steps that firstly, copper and manganese are placed in a crucible of a vacuum induction smelting furnace to be subjected to primary vacuum pumping, and then preheating treatment is conducted; secondly, raw materials obtained after preheating treatment are refined, copper-manganese alloy melt is obtained, and inflation of argon serving as protective gas is conducted for heating; thirdly, the heated copper-manganese alloy melt is cast, and a copper-manganese intermediate alloy cast ingot is formed; and fourthly, the copper-manganese intermediate alloy cast ingot is placed in an aluminum oxide brick or aluminum oxide sand to be subjected to aircooling to the room temperature, and the high-manganese-content copper-manganese intermediate alloy is obtained. According to the method, the vacuum induction smelting furnace is inflated with the high-purity argon in the copper-manganese raw material preheating process, after being exhausted, gas adsorbed to the surfaces of the raw materials including the copper and the manganese is mixed with the argon, accordingly, oxygen partial pressure in the furnace is reduced, the phenomenon of oxidization slagging of the manganese element in the smelting process is avoided, and accordingly, the content of the manganese element in the copper-manganese intermediate alloy is larger than 30% and does not exceed 50%.

Description

technical field [0001] The invention belongs to the technical field of vacuum metallurgy smelting, and in particular relates to a vacuum induction smelting method for a copper-manganese intermediate alloy with high manganese content. Background technique [0002] Copper-manganese master alloy is an important raw material for the production of non-ferrous metal alloys containing copper and manganese, and plays an important role in batching and adjusting components in the smelting of non-ferrous metal alloys containing copper and manganese. In the production of non-ferrous metal alloy products containing copper and manganese, since manganese is easily oxidized and volatile, the actual yield of the alloy is low when manganese is added in the form of simple substance, the composition is difficult to control and the alloy melting is difficult. Therefore, when smelting non-ferrous metal alloys containing copper and manganese, copper-manganese master alloy is often added to prevent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/05C22C1/02C22C1/03
CPCC22C1/02C22C1/03C22C9/05
Inventor 赵涛孟志军何健范晔孙凯军赵小波史智峰王航王宏宇陈勇韩吉庆陈昊
Owner 西安诺博尔稀贵金属材料股份有限公司
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