CN104630497A - Melting technology of casting pure copper - Google Patents

Abstract

The invention discloses a melting technology of casting pure copper. The technology comprises the following steps: pre-heating a graphite crucible until the color of the graphite crucible becomes dark red, adding a layer of dry charcoal or covering agent on the crucible bottom, wherein the thickness of the layer is 30 to 50 mm; then sequentially adding leftovers, waste blocks, and rods, finally adding pure copper; pre-heating supplemental alloy elements in the platform of a medium-frequency induction furnace, frequently stirring the materials during the melting process so as to prevent phenomenon of bridging; keeping on heating to completely melt the alloy elements, adding phosphor-copper to remove the oxygen when the temperature reaches 1200 to 1220 DEG C, wherein the weight of the added phosphor-copper accounts for 0.3-0.4% of the alloy liquid weight, and finally removing the slag after complete reactions. The operation is simple and convenient, the technological process is easy to control, the obtained copper purity is high, and the plasticity of the copper is strong.

Description

Pure copper smelting technique is used in casting

 

Technical field

The invention belongs to pure copper smelting technique, be specifically related to a kind of casting pure copper smelting technique.

 

Background technology

Casting is a class important in non-ferrous metal with pure Copper and its alloy, uses wider in actual production.No matter be sand mold casting or investment cast, melting is all a vital ring in Foundry Production.

 

Summary of the invention

In order to overcome the above-mentioned defect that prior art field exists, the object of the invention is to, a kind of casting pure copper smelting technique is provided, easy to operate.

Casting pure copper smelting technique provided by the invention, technical process comprises:

A, plumbago crucible is preheated to garnet, at the bottom of crucible, adds dry charcoal or insulating covering agent that a layer thickness is 30-50mm, then add scrap stock, useless block and bar successively, finally add fine copper;

Preheating on the table that b, the alloying element added can be placed on medium-frequency induction furnace, frequent movable furnace charge in whole thaw process, in case put up a bridge;

After c, intensification make alloying element all melt, when temperature reaches 1200-1220 DEG C, add the phosphor-copper deoxidation accounting for aluminium alloy quality 0.3-0.4%, fully after reaction, removing is skimmed.

Casting pure copper smelting technique provided by the invention, its beneficial effect is, simple to operation, and technological process is easy to control, and the copper purity obtained is high, and plasticity-is strong.

 

Embodiment

Below in conjunction with an embodiment, casting pure copper smelting technique provided by the invention is described in detail.

 

Embodiment

A, plumbago crucible is preheated to garnet, at the bottom of crucible, adds dry charcoal or insulating covering agent that a layer thickness is 30-50mm, then add scrap stock, useless block and bar successively, finally add fine copper;

Preheating on the table that b, the alloying element added can be placed on medium-frequency induction furnace, frequent movable furnace charge in whole thaw process, in case put up a bridge;

After c, intensification make alloying element all melt, when temperature reaches 1200-1220 DEG C, add the phosphor-copper deoxidation accounting for aluminium alloy quality 0.3-0.4%, fully after reaction, removing is skimmed.

Claims (1)

1. a pure copper smelting technique is used in casting, and it is characterized in that, technical process comprises:

A, plumbago crucible is preheated to garnet, at the bottom of crucible, adds dry charcoal or insulating covering agent that a layer thickness is 30-50mm, then add scrap stock, useless block and bar successively, finally add fine copper;

Preheating on the table that b, the alloying element added can be placed on medium-frequency induction furnace, frequent movable furnace charge in whole thaw process, in case put up a bridge;

After c, intensification make alloying element all melt, when temperature reaches 1200-1220 DEG C, add the phosphor-copper deoxidation accounting for aluminium alloy quality 0.3-0.4%, fully after reaction, removing is skimmed.