JPS6077981A - Manufacture of potassium gold cyanide - Google Patents

Abstract

PURPOSE:To manufacture efficiently potassium gold cyanide without controlling conditions of electric current during electrolysis by dispersing gold dust or grains on a horizontal electrode on the bottom of an electrolytic cell to form an anode, placing an electrode as a cathode at a distance from the anode with a diaphragm in-between, and carrying out electrolysis. CONSTITUTION:When potassium gold cyanide is manufactured by electrolysis, gold dust, grains, lumps, rods or chips are dispersed on a horizontal electrode of Ti or the like on the bottom of an electrolytic cell to form an anode, and an electrode of stainless steel or the like put in a basket of a semipermeable membrane is placed as a cathode at the center of the cell at a prescribed distance from the anode. Electrolysis is carried out by applying DC to the electrodes in a KCN soln. as an electrolytic soln. The surface area of the gold dust or the like is hardly changed only by supplying a prescribed amount of gold dust or the like in accordance with the progress of the electrolysis, and the available area of the anode can be kept almost uniform, so the control of conditions of electric current during electrolysis is not required to improve the work efficiency and productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for producing potassium gold cyanide.

Conventionally, when gold potassium cyanide was produced by electrolysis, a plate-shaped gold ingot was used as an anode, but the plate-shaped gold ingot was consumed as electrolysis progressed, reducing the surface area of the anode. The current conditions and other conditions were controlled according to consumption, or the plate-shaped gold ingot was replaced when the surface area of the anode decreased by a certain amount. Another method is to put two grains of gold powder in an insoluble basket, hang it vertically in a tank, and use it as an anode to produce potassium gold ricyanide by electrolysis, but as the electrolysis progresses, it is consumed. Two grains of gold powder, etc., settle inside the anode, reducing the surface area of the anode, so it is necessary to replenish one grain of C gold powder, etc., depending on the amount of consumption.

The present invention was made to solve this problem, and even if an anode such as a single grain of gold powder is consumed, the effective area as an anode can be kept approximately constant and the current conditions for electrolysis can be controlled. The object of the present invention is to provide a method capable of producing potassium gold cyanide without the need for the production of potassium gold cyanide.

In the method for producing potassium gold cyanide of the present invention, nine gold powder particles, lumps, rods, or plates are dispersed on a horizontal electrode at the bottom of the tank to serve as an anode, and a diaphragm is present. This method is characterized by producing potassium gold cyanide using an electrolytic method using an isolated electrode as a cathode.

In the method for producing potassium gold cyanide of the present invention, as the electrolysis progresses, the two particles of gold powder, etc., which serve as an anode and are dispersed on a horizontal electrode, are consumed, but the planar area thereof remains almost unchanged. Therefore, the effective area of the anode can be kept substantially constant, and the current conditions for electrolysis can be kept constant. In particular, if one particle of gold powder or the like is replenished and dispersed on the electrode as electrolysis progresses, or if a predetermined amount is supplied,
The effective area as an anode can be maintained approximately constant continuously, and a single grain of gold powder, etc. on the electrode can be vibrated as electrolysis progresses, or the surface of a single grain of gold powder, etc. can be touched with a rotating rod. If this happens, the distribution of the two gold powder particles etc. on the electrode will be uniform, the effective area of the anode can be kept constant continuously, and the current conditions for electrolysis can also be kept constant.

In this way, even if the anode, such as two gold powder particles, is consumed, there is no need to control the electrolytic current conditions, improving workability and productivity.

Next, in order to clarify the effects of the method for producing potassium gold cyanide of the present invention, specific examples and conventional examples thereof will be described.

〔Example〕

10 gold grains with a diameter of 1 to 3 dragons were placed on the disk-shaped horizontal Ti electrode at the bottom of a cylindrical electrolytic cell with a diameter of 50 marks and a depth of 44 marks.
kg is dispersed to form an anode with an area of 20 dm2, a cage of semipermeable membrane (a cation exchange membrane may also be used) is arranged in the center of the electrode tank, and a stainless steel mesh electrode is arranged as a cathode on this muscle, and the distance between the electrodes is was kept at 13 cm, and KCN 10 was placed in the electrolytic bath.
Electrolyte 807 with 0g/N and liquid temperature of 85℃! was injected. Electrolysis is then carried out using a direct current of 25 OA, and as the anode wears out, gold particles are replenished onto the Ti electrode at the bottom of the electrolytic cell, and the effective area of the anode is kept constant by a rotating rod and continuously. Potassium gold cyanide was produced. In this way, 200g/7 of gold potassium cyanide in 6 hours! Obtained. During this time, the current conditions for electrolysis were not controlled at all.

[Conventional example]

A box-shaped electrolytic cell measuring 25 cm long, 70 cm wide, and 50 cm deep is partitioned with a cation exchange membrane, and one side is 2 mm thick.

A plate-shaped gold bullion with a width of 600 mm and a height of 450 mm is suspended to serve as an anode, and on the other side is a metal plate with a thickness of 1 dragon 1 width of 650 + u and a height of 450 mm.
A silk stainless steel plate is suspended as a cathode, and the distance between the poles is 1.
KCN was kept at 3 cIl and 100g/l of KCN was added in the electrolytic bath.
Electrolyte solution 804 with a liquid temperature of 85° C. was injected. And electrolysis 2
50, due to consumption of the anode, 2
In time, it became impossible to perform electrolysis with the original 250A DC current.

As can be seen from the above explanation, the method for producing potassium gold cyanide of the present invention involves dispersing a grain of gold powder or the like into a horizontal electrode at the bottom of the tank to form an anode, and then using a diaphragm to separate the electrodes. Since gold potassium cyanide is made as the cathode by electrolysis, even if the gold that is the anode is consumed as the electrolysis progresses, the gold is consumed only on the top surface, and its planar area hardly changes. The effective area as an anode is kept approximately constant, and the current conditions for electrolysis are constant. Therefore, there is no need to control the current conditions for electrolysis regardless of the consumption of the anode, which has the excellent effect of improving the workability and productivity of gold potassium cyanide production.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] A grain of gold powder, a lump, a bar, or a plate is dispersed on a horizontal electrode at the bottom of the tank to serve as an anode, and the separated electrode with a diaphragm is used as a cathode to produce cyanide using an electrolytic method. A method for producing potassium gold cyanide, characterized by producing potassium gold.