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JP-2026075534-A - Mold for manufacturing lead buttons, and method for manufacturing lead buttons

JP2026075534AJP 2026075534 AJP2026075534 AJP 2026075534AJP-2026075534-A

Abstract

[Problem] To improve the efficiency of the process of recovering cooled and solidified material from the mold in the manufacturing of lead buttons. [Solution] A mold for manufacturing lead buttons in a dry assay, comprising a bottomed funnel-shaped container portion and a base portion having a through hole that contacts the outer surface of the container portion when it is inserted and can support the container portion from below, wherein the container portion is separate from the base portion and is detachably configured. [Selection Diagram] Figure 1

Inventors

  • 森川 裕地

Assignees

  • 住鉱テクノリサーチ株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (8)

  1. A mold for manufacturing lead buttons in the dry assay method, A container section having a bottomed funnel shape and configured to contain a molten sample, The base portion has a through hole that contacts the outer surface of the container portion when the container portion is inserted and can support the container portion from below, The container portion is separate from the base portion and is configured to be detachable. A mold for manufacturing lead buttons.
  2. The container portion comprises an enlarged diameter portion and a molding portion connected to the enlarged diameter portion for containing the molten sample. The molded part has a cylindrical shape. A mold for manufacturing a lead button as described in claim 1.
  3. The container portion comprises an enlarged diameter portion and a molding portion connected to the enlarged diameter portion for containing the molten sample. The molded portion has an inverted truncated cone shape, in which the inner wall is inclined such that the inner diameter decreases towards the bottom. A mold for manufacturing a lead button as described in claim 1.
  4. The thickness of the container portion is 3 mm or more and 7 mm or less. A mold for manufacturing a lead button according to any one of claims 1 to 3.
  5. The inclination angle of the inclined surface in the enlarged diameter portion is 15 degrees or more and 25 degrees or less. A mold for manufacturing the lead button described in claim 3.
  6. A method for manufacturing lead buttons using the dry assay method, The process involves preparing a mold comprising: a container portion having a bottomed funnel shape and configured to contain a molten sample; and a base portion having a through hole that contacts the outer peripheral surface of the container portion when it is inserted and can support the container portion from below, wherein the container portion is separate from the base portion and is detachably configured; The process involves pouring the molten sample into the container and allowing it to cool and solidify, The process involves detaching the container portion from the base portion and removing the cooled and solidified material from the container portion. The process includes a step of producing a lead button from the cooled and solidified material. A method for manufacturing lead buttons.
  7. The container portion comprises an enlarged diameter portion and a molding portion connected to the enlarged diameter portion for containing the molten sample. The molded part has a cylindrical shape, In the step of removing the cooled and solidified material, the container is turned upside down. The method for manufacturing a lead button according to claim 6.
  8. The container portion comprises an enlarged diameter portion and a molding portion connected to the enlarged diameter portion for containing the molten sample. The molded portion has an inverted truncated cone shape, in which the inner wall is inclined such that the inner diameter decreases towards the bottom. In the step of removing the cooled and solidified material, the container is turned upside down. The method for manufacturing a lead button according to claim 6.

Description

This invention relates to a mold for manufacturing lead buttons and a method for manufacturing lead buttons. For example, if a sample contains precious metals such as Au (gold), it may be necessary to separate and recover the precious metals from the sample. From the perspective of determining the precious metal content in the sample, the precious metals contained in the sample may be analyzed. One such analytical method is the dry assay. The dry assay is standardized in JIS M 8111 (Method for the determination of gold and silver in ore). In the dry assay method, the sample is first mixed with lead(II) oxide, a flux, and a reducing agent, then melted in a crucible. The molten sample is poured into a mold and cooled. The resulting solidified material is formed by the specific gravity separation of a lead layer containing lead and a slag layer containing slag. The precious metals are collected in the lead layer, separating them from other components. Next, the solidified material is struck to physically separate the lead layer. This lead layer is button-shaped, forming a lead button. The lead button is then shaped into a roughly rectangular prism by hammering, and the precious metals are extracted by cupellation and quantified. For producing lead buttons, molds with, for example, a hemispherical base are used. The lead buttons obtained from such molds will have a convex lens shape or a hemispherical shape corresponding to the mold. These lead buttons are then shaped into, for example, rectangular prisms or cubes, and after shaping, they are introduced into the cupellation furnace. JIS M 8111 (Method for determining the amount of gold and silver in ore) Figure 1 is a perspective view showing a schematic configuration of a mold according to one embodiment of the present invention.Figure 2A is a diagram showing the schematic configuration of the container portion that makes up the mold.Figure 2B is a cross-sectional view showing the schematic configuration of the container portion that constitutes the mold.Figure 3 is a cross-sectional view showing a schematic configuration of a modified example of the container portion that constitutes the mold.Figure 4 shows the schematic structure of the cooled solidified material obtained from the mold.Figure 5 shows a schematic diagram of a modified example of a cooled solidified product obtained from a mold.Figure 6 is a perspective view showing the schematic configuration of a conventional mold. As mentioned above, conventional molds require considerable time and effort to cool the molten sample and recover the resulting solidified material, resulting in low efficiency in lead button production. Here, we will explain conventional molds using Figure 6. Figure 6 is a perspective view showing the schematic configuration of a conventional mold. As shown in Figure 6, a conventional mold 100 is constructed with multiple container sections 110 as hemispherical recesses into which molten sample is poured, and a flat plate-shaped member 120 that integrates these. In Figure 6, for convenience, the container sections 110 and the flat plate-shaped member 120 are depicted separately as part of the mold 100, but they are actually a single mass, manufactured, for example, by casting. In this mold 100, it is necessary to retrieve each cooled and solidified object produced in each container section 110 by turning them over using tweezers or similar tools. Furthermore, the retrieved cooled and solidified objects must be handled carefully to avoid mixing them up or contacting other cooled and solidified objects, which can be time-consuming and laborious. Furthermore, the inventors' studies revealed that the conventional mold 100 presents the following additional problem: It is difficult to adjust the cooling rate when cooling the molten sample in the conventional mold 100. This point will be explained below. In mold 100, the cooling rate of the molten sample is crucial from the perspective of separating lead from slag in the cooled and solidified material of the molten sample. If the cooling rate is excessively fast, the molten sample may cool and solidify before the lead settles and sufficiently separates from the slag. As a result, lead may be mixed into the slag, making it difficult to accurately quantify the precious metals captured by the lead. Therefore, it is desirable to adjust the cooling rate in mold 100 to prevent it from becoming excessively fast. However, conventional molds 100 tend to have a fast cooling rate. Specifically, the mold 100 comprises a container section 110 for injecting the molten sample and a flat plate-shaped member 120. Since these are integrally formed, the entire mold is generally thick. When injecting a molten sample into such a container section 110, a small amount of the molten sample comes into contact with the excess metal forming the mold 100. Therefore, the heat from the molten sample is quickly absorbed by the mold 100. In other words, with conventio