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Flat die casting method for silver bullion

A casting method and silver ingot technology, which is applied in the field of silver ingot flat mold casting, can solve the appearance problems of finished silver ingots and other problems, and achieve the effects of small investment, high molding rate at one time, and strong adaptability of raw materials

Active Publication Date: 2009-07-22
HENAN YUGUANG GOLD & LEAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a silver ingot flat mold casting method aimed at solving the problem of oxygen absorption and exhaust during the silver ingot flat mold casting process, thereby solving the appearance problem of the finished silver ingot

Method used

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  • Flat die casting method for silver bullion

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Effect test

Embodiment 1

[0022] Embodiment 1: a kind of method for silver ingot flat mold casting is divided into the following steps:

[0023] (1) The material is heated in a graphite crucible to a molten state by an intermediate frequency furnace.

[0024] (2) During the melting process, the material is mixed with charcoal as a reducing agent in batches. When the charcoal is burned, the oxygen in the gap of the silver powder is consumed, and the material floats on the liquid surface after melting, which not only protects the liquid surface, but also makes the dissolved oxygen part remove. Charcoal consumption is 0% to 2.5%, adding in 2 to 5 times.

[0025] (3) When the temperature of the melt reaches the casting temperature, pour it into a flat mold and cast it. After the melt fills the cavity, use flame protection.

[0026] (4) The combustible gas flame covers the cooling surface to slowly cool down the silver ingot. During this process, the high-speed airflow in the flame isolates the air and p...

Embodiment 2

[0034] Embodiment 2: first add a certain amount of charcoal at the bottom of the crucible, add the material to be processed into the crucible, and continue to add a small amount of charcoal; add a small amount of charcoal according to the situation during the process of adding materials. When the mold melt is heated to the appropriate casting temperature, it is poured into the mold, and the liquid surface is immediately protected with a gas flame until it is completely solidified. The mold needs to be preheated before use. Then soak and wash the silver ingots with dilute sulfuric acid for use.

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Abstract

The invention relates to a method for casting a silver ingot flat die. The method adds charcoal during melting of silver powder or silver ingots as a reducer and uses high-temperature high-speed air flow to protect a casting mold under the condition of cooling so as to realize prevention of oxygen in the air from being dissolved and entering a fused silver mass and smooth separation of oxygen in the fused silver mass, solve the problem of oxygen absorption of silver during melting and the high-temperature fused mass by adoption of protective measures, and adopt liquid-level heat insulation to make the oxygen in the fused mass smoothly separated out. Moreover, the method has the advantages of small investment, simple operation and high forming rate.

Description

technical field [0001] The invention belongs to the non-ferrous metal smelting industry, and in particular relates to a silver ingot flat-die casting method. Background technique [0002] At present, silver ingot casting methods can be divided into vertical mold casting and flat mold casting according to the way molds are placed in the casting process. The traditional casting method is vertical mold casting. At present, most domestic manufacturers adopt this method. Beginning in January 2008, LME stopped delivering silver ingots cast in vertical molds, and fully delivered flat mold silver ingots. Since then, large-scale domestic manufacturers have begun to study flat die casting methods. [0003] The traditional silver ingot casting method is characterized in that the silver ingots are arranged vertically during casting, and the casting mouth and riser are arranged above. The advantages of this method are: (1) the silver ingot absorbs less oxygen during the solidificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
Inventor 王光忠赵洪浩陈海军彭涛刘超崔小康
Owner HENAN YUGUANG GOLD & LEAD
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