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Preparation technology of efficient and stop loss noble metal product

A preparation process, a technology of precious metals, applied in the field of metal materials, can solve the problems of difficult molding and other problems, and achieve the effects of low cost, high degree of commercialization, and simple process

Inactive Publication Date: 2014-03-12
ZHEJIANG GOLD OX IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, precious metal crucibles are mainly prepared by hot forging extrusion method. This method has advantages for metals with low melting point and high ductility, but it has great limitations for brittle metals with high melting point, such as ruthenium, rhodium, osmium, iridium and other precious metals. The casting-formed precious metal body is hot-forged at high temperature, which is difficult to form

Method used

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Embodiment Construction

[0038] A high-efficiency, loss-stopping preparation process of precious metal products, including precious metal refining, preparation of composite molds and molding and firing of products, the specific steps are as follows,

[0039] Step 1 Precious metal refining

[0040] (1) Pulverize, use a ball mill or a vertical mill to crush the raw materials to 0.5mm~10mm, and classify with a classifier, and return the coarse-grained ones for regrinding until the powder particle size reaches 200 mesh sieves, and dissolve the above-mentioned ones with an organic solvent Powder, the organic solvent is one or more of N-methylpyrrolidone, dimethyl sulfoxide, methyl isobutyl ketone, N, N-dimethylformamide, tetrahydrofuran, tributyl phosphate Mixed solvent, the dissolution temperature is 100°C, the dissolution time is 2 hours, and then the metal and non-metal are separated by a high-voltage electrostatic separator; the separated metal powder is separated by a weak magnetic separator to separa...

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Abstract

The invention discloses an efficient and stop loss preparation technology of a noble metal product. The preparation technology comprises the following steps of refining noble metals, preparing a composite mould, and forming and firing a product. The technology provided by the invention has the advantages that the purity of the noble metal is improved, the forming and firing quality of the noble metal product is improved, the technology is simple and practicable, the cost is low, and the synchronization of sintering densification and forming is realized.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation process of high-efficiency and loss-stopping precious metal products. Background technique [0002] Gold and silver are generally associated in minerals in the form of simple substances. The main metallic minerals are pyrite, arsenopyrite, etc., followed by galena, sphalerite, pyrrhotite, arsenopyrite, etc. The non-metallic minerals are quartz, feldspar and carbonate minerals. Gold and silver are closely related to pyrite and arsenopyrite, and generally form associated ores. For arsenopyrite the main component is AsFeS 2 , SiO 2 And other trace elements such as gold and silver associated with it. [0003] At present, in the field of gold smelting, three pretreatment methods are generally used for refractory gold concentrates containing arsenic. The first is the secondary boiling roasting technology; the second is the hot pressing technology; the third...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B11/00C04B35/83B22F3/16B22F3/03B22F9/20
CPCY02P10/20
Inventor 叶亮庄旭春
Owner ZHEJIANG GOLD OX IND & TRADE
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