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Method for manufacturing noble metal smelting vessel

A technology of precious metals and utensils, which is applied in the field of preparation of precious metal smelting utensils, which can solve the problems of affecting the metal smelting effect, loose contact, difficult matching, etc., and achieve the effect of guaranteed smelting effect, low cost and good thermal stability

Inactive Publication Date: 2009-07-08
CNOOC TAIYUAN PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems that the existing precious metal smelting vessel is composed of a shaped crucible and an induction coil, which cause the two to be difficult to match, the contact is not close, and the crucible material contains base metals, which affects the metal smelting effect, etc., and provides a preparation of a precious metal smelting vessel method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A method for preparing a precious metal smelting vessel, comprising the following steps: (1) Raw material preparation: zirconia and dextrin with mesh numbers of 160-180 mesh, 40-60 mesh, 18-30 mesh, and 10-15 mesh are prepared according to the following steps: Mix by weight, then add water to make it evenly, the weight ratio of the amount of water added to all the above-mentioned raw materials is 1:6, the composition and weight ratio of the raw materials are as follows: 160-180 mesh zirconia 10%; 40-60 mesh zirconia Zirconium 25%, 18-30 mesh zirconia 25%, 10-15 mesh zirconia 38%, dextrin 2%; (2) Pound molding: A, place a refractory bottom plate on the bottom of the induction coil, cut a piece and Spread asbestos cloth of the same size as the bottom plate on it; B. Cut a piece of asbestos cloth 1.3cm higher than the induction coil and wrap it tightly around the inner circumference of the induction coil; C. Spread a layer of 10-25 mesh on the asbestos cloth at the bottom o...

Embodiment 2

[0011] A method for preparing a precious metal smelting vessel, comprising the following steps: (1) Raw material preparation: zirconia and dextrin with mesh numbers of 160-180 mesh, 40-60 mesh, 18-30 mesh, and 10-15 mesh are prepared according to the following steps: Mix in a weight ratio, then add water to make it even, the weight ratio of the amount of water added to all the above raw materials is 1:8, the composition and weight ratio of the raw materials are as follows: 15% zirconia for 160-180 mesh; zirconia for 40-60 mesh 30% zirconium, 15% zirconium oxide 18-30 mesh, 39% zirconium oxide 10-15 mesh, 1% dextrin; (2) stamping and forming: A, place a refractory bottom plate on the bottom of the induction coil, cut a piece and Spread asbestos cloth of the same size as the bottom plate on it; B. Cut a piece of asbestos cloth 1.2cm higher than the induction coil and wrap it tightly around the inner circumference of the induction coil; C. Spread a layer of 10-25 mesh on the asbes...

Embodiment 3

[0013] A method for preparing a precious metal smelting vessel, comprising the following steps: (1) Raw material preparation: zirconia and dextrin with mesh numbers of 160-180 mesh, 40-60 mesh, 18-30 mesh, and 10-15 mesh are prepared according to the following steps: Mix by weight, then add water to make it even, the weight ratio of the amount of water added to all the above raw materials is 1:7, the composition and weight ratio of the raw materials are as follows: 160-180 mesh zirconia 12%; 40-60 mesh zirconia 25% zirconium, 15% zirconia 18-30 mesh, 45% zirconia 10-15 mesh, 3% dextrin; (2) stamping and forming: A, place a refractory bottom plate on the bottom of the induction coil, cut a piece and Spread asbestos cloth of the same size as the bottom plate on it; B. Cut a piece of asbestos cloth 1.5cm higher than the induction coil and wrap it tightly around the inner circumference of the induction coil; C. Spread a layer of 10-25 mesh on the asbestos cloth at the bottom of the...

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Abstract

The invention relates to the field of noble metal melting, in particular to a method for preparing a noble metal melting vessel, which solves the problems that the prior noble metal melting vessel consists of a formed crucible and an induction coil which are difficult to match with each other and do not closely contact each other, so that the metal melting effect is influenced. The method comprises: firstly, mixing zirconia and dextrin with different mesh numbers according to certain weight ratio, and adding water into the mixture for uniform mixing; secondly, tamping forming, namely placing a refractory bottom board at the bottom of the induction coil, wrapping two pieces of asbestos cloth inside the bottom board and the induction coil respectively, placing a model into the melting vessel, filling prepared raw materials on the periphery of the model, and performing tamping and demolding; thirdly, coating, namely preparing a zirconia phosphoric acid solution, and coating the zirconia phosphoric acid solution on the inner wall of the melting vessel; and fourthly, roasting. Due to adoption of the method, the melting vessel is closely matched with the induction coil and integrated into a whole, and has the advantages of high mechanical intensity and thermal stability, high temperature resistance, convenient manufacture, low cost and the like. Moreover, the melting vessel does not contain base metals and has long service life.

Description

technical field [0001] The invention relates to the field of precious metal smelting, in particular to a method for preparing a precious metal smelting vessel. Background technique [0002] There is an important process step in the manufacture of platinum mesh catalysts for nitric acid production. This step is the melting of platinum-based alloys, usually by induction melting. The quality of the smelted precious metal alloy directly affects the quality of the product and the processing performance of subsequent materials. The container that all adopts in the smelting process at present is the crucible placed in the induction coil. The preparation method and materials of the crucible have an important influence on the smelted precious metal alloy ingot. For example, the crucible is usually required to withstand a high temperature of about 2000 ° C, and the crucible material must not contain other base metal impurities, so as not to affect the performance of the alloy; The cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/48C04B35/622
Inventor 王志荣赵宇
Owner CNOOC TAIYUAN PRECIOUS METALS
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