JP2925521B2 - Electric furnace for gold smelting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process for extracting a gold component contained in gold debris and the like generated at the time of precious metal processing, by incinerating impurities in the gold debris at the time of precious metal processing at a high temperature. TECHNICAL FIELD The present invention relates to an electric furnace for gold smelting (refining) that can be usefully used to recover high-quality gold, or can be usefully used in the production of gold alloys or castings.

[0002]

2. Description of the Related Art Conventionally, in order to recover gold from fine gold debris and the like generated during precious metal work, gold dust is dissolved using aqua regia in which concentrated nitric acid, which is a chemical, is mixed with concentrated hydrochloric acid. Although gold is extracted, since the aqua regia is a strong acid,
Special care must be taken in the dissolving work, and since aqua regia is a strong acid, toxic gases generated before using it to extract gold from precious metalwork debris,
There are many problems such as polluting the environment with liquids and the like.

[0003] Also, when manufacturing gold alloys and castings, there is no suitable small smelting machine for manufacturing alloys and castings. Therefore, a gold material to be alloyed or cast is put in a container, and an oxygen welding machine or the like is used. Since the material is heated and the alloy or casting is being manufactured, the content of gold decreases due to the flame of the oxygen welder, etc., and to compensate for the reduction, put more than a certain amount of gold in the alloy work. In addition, there was a problem that there was an economical loss, and that the production of alloys or castings was carried out in an open space, so that a lot of pollution occurred.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has been developed in consideration of chemicals, namely,
To extract gold from precious metalwork fines without the use of strong acids, this gold waste can be heated to a high temperature to incinerate impurities to extract good quality gold, and to produce gold alloys and castings An object of the present invention is to provide a small electric furnace which can easily maintain the gold content at times and can smelt gold without generating pollution during operation.

[0005]

To solve the above-mentioned problems, an electric furnace for smelting gold according to the present invention comprises a control box (1).
The rotating supports 2 and 2 'are provided on the upper side, and the rotating rod 3 is pivotally mounted between the rotating supports 2 and 2'. Is an outer cylinder 5, an inner cylinder 6, and a cover 7
The crucible installation port 8 is provided at the upper inside of the inner cylindrical body 6.
A refractory brick 9 made of a refractory cement or a ceramic material or the like with a cutout on one side is provided therein, and a refractory brick 11 made of a refractory cement or a ceramic material or the like in which a storage groove 10 is formed at a lower portion. Built inside, refractory bricks 9, 11
Heating rods 12, 12 ′ are inserted between the heating rods 12, 12 ′ to insulate the heating rods 12, 12 ′ between the refractory bricks 9, 11 and the inner cylinder 6 with a ceramic boat 13.
2, 12 'are electrically connected.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3
As shown in the figure, a rotation support 2, 2 'is provided on the control box 1, and a rotation rod 3 is pivotally mounted between the rotation support 2, 2' so that the electric furnace 4 can rotate. Constitute. The electric furnace 4 includes an outer cylinder 5, an inner cylinder 6, and a cover 7.

A crucible (crucible) installation port 8 is provided in the upper inside of the inner cylinder 6, and a refractory brick 9 made of a refractory cement or a ceramic material cut off on one side is provided in communication with the crucible installation port 8. A refractory brick 11 made of a refractory cement or a ceramic material in which an emergency storage groove 10 is formed is provided at a lower portion inside the inner cylinder 6, and a heating rod (trade name: TECORUNDUM) is provided between the refractory bricks 9 and 11. 12, 1
Insert 2 'through. Heating rod 1 between refractory bricks 9 and 11
The ceramic boat 13 insulates the space between 2, 2 'and the inner cylinder 6, and the heating rods 12, 12' are electrically connected. In the drawing, reference numeral 7 denotes a cover, 14 denotes a crucible installation port 8 and a crucible installed in a notch, 15 denotes a support base installed on the control box 1, and 16 denotes a collection container supported by the support base 15. is there.

The above configuration will be described in more detail below together with its operation. To extract gold from precious metalwork fines using the present invention, first, the lid 7 'of the cover 7 is opened to form the refractory cement 9 of the inner cylinder 6 or the refractory brick 9 of ceramic material or the like. The crucible 14 is set in the crucible setting port 8, fine noble metal work fines are finely crushed and put into the crucible 14, and when electricity is supplied, a heating rod as a heating body (in the present invention, the product name is Tecorundum. Used) 12, 1
2 'is heated. The temperature of the electric furnace 4 is about 1,3 by the temperature sensor of the control box 1 and the control circuit.
By adjusting and heating to about 00 ° C. or more, all impurities other than gold in the precious metal work fine debris in the crucible 14 are incinerated.

At this time, the heat in the electric furnace 4 causes the ceramic boat 1 serving as a heat insulator between the inner cylinder 6 and the heating rods 12 and 12 '.
3, heat generated by the heating rods 12, 12 'is transferred to the inner cylinder 6
Since the heat is blocked so as not to be radiated to the outside and only the crucible 14 side is heated, the thermal efficiency can be increased.

[0010] When the incineration of the impurities is completed in this way, the power is turned off, the crucible 14 is pulled out, and the gold ash remaining in the crucible 14 can be recovered. Further, the crucible 14 is fitted into the crucible installation port 8, the remaining gold ash incinerated in the crucible 14 is added, a chemical is added, and power is supplied to the electric furnace 4, so that the heating rods 12, 12 While the ′ is being heated, the temperature of the electric furnace 4 is adjusted and heated by the control circuit of the control box 1 to the same temperature as at the time of the incineration, and gold ash and chemicals act in the crucible 14 to melt the gold.

When the gold melts, the power is cut off and the electric furnace 4 is rotated by the rotating rods 3 of the rotating supports 2 and 2 'as shown in FIG. The molten gold in the crucible 14 can be normally recovered to the recovery container of the above.

Also, even if the crucible 14 breaks during heating and melting, and the melted gold leaks from the cracks, the leaked melted gold is formed on the refractory brick 11 such as a refractory cement or a ceramic material. Can be collected in the emergency storage groove 10, and even if the crucible 14 is broken, gold can be collected.

On the other hand, when an alloy or a casting is manufactured using gold, a crucible 14 having a length corresponding to the length of a heating portion of the heating rods 12 and 12 ′ is fitted into the inner cylinder 6 of the electric furnace 4. If an alloy or a material to be cast is put into the crucible 14, the temperature of the electric furnace 4 is set to 1,300 ° C. or less, and the power is turned on, the alloy is heated by the heating rods 12, 12 ′. Alternatively, the material from which the casting is to be produced can be easily melted.

At this time, the length of the crucible 14 is
Since it is the same as the length of the heating portion 12 ', there is no vertical temperature deviation due to the position in the crucible 14, and the set temperature can be maintained at any position, so that the alloy deviation due to the temperature deviation at the time of alloying can be reduced. Further, since the alloy or the material to be cast is put into the crucible 14 and melted in a sealed state, the content of gold does not decrease.

When the alloy or the material to be cast is melted during the production of the alloy or casting, the crucible 14 is pulled out with a nipper or the like without rotating the electric furnace 4 of the present invention, and the process proceeds to the next step. .

[0016]

As described above, according to the present invention, gold fine debris is heated and melted at a high temperature during precious metal processing by an electric furnace to incinerate and remove impurities, and high-quality gold is recovered. Eliminates environmental pollution by not using certain strong acids
In addition, accidents can be prevented while ensuring worker safety. In addition, there are many advantages such as a reduction in gold content and no occurrence of alloy deviation due to temperature deviation during the production of alloys or castings.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an electric furnace for gold smelting according to an embodiment of the present invention, with a part cut away.

FIG. 2 is a partially broken side view showing the electric furnace for smelting gold.

FIG. 3 shows the electric furnace for smelting gold, and is a partially broken side view for explaining a rotating operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control box 2 and 2 'rotation support stand 3 rotation rod 4 Electric furnace 5 Outer cylinder 6 Inner cylinder 7 Cover lid 8 Input port 9 Firebrick 10 Storage groove 11 Firebrick 12, 12' Heating rod 13 Ceramic boat

Claims (1)

(57) [Claims] 1. A rotating support 2, 2 'is provided on a control box 1, and a rotating rod 3 is pivotally mounted between the rotating supports 2, 2', on which an electric furnace 4 can be rotated. The electric furnace 4 is constituted by an outer cylinder 5, an inner cylinder 6, and a cover 7, and a crucible installation port 8 is provided on the upper inside of the inner cylinder 6.
A firebrick 9 made of a refractory cement or a ceramic material or the like with a cutout on one side is installed therein, and a firebrick 11 made of a refractory cement or a ceramic material or the like in which a storage groove 10 is formed is provided at a lower portion, Heating rods 12 and 12 'are inserted between the refractory bricks 9 and 11 so that the ceramic rod 13 insulates between the heating rods 12 and 12' between the refractory bricks 9 and 11 and the inner cylinder 6. An electric furnace for smelting gold, wherein the heating rods 12 and 12 'are electrically connected.