JPS58151434A - Extracting method of noble metal - Google Patents

Abstract

PURPOSE:To decompose noble metals with a simple operation without the generation of polluting vapor and the dissipation of noble metals in the stage of decomposing and extracting the noble metals from ores and scraps contg. noble metals. CONSTITUTION:Ores or scraps contg. noble metals are melted together with the mixture of a silver supplying material and a slagging agent and the noble metal components are captured in silver; the other components are separated as slag from the silver alloys. The silver supplying material is silver base or scrap contg. silver at a relatively high rate. The slagging agent is added in order to bind the components except the intended metals and to separate the same as slag in the stage of melting, and is prepd. by compounding reducing agents, oxidizing agents, etc. with flux components such as SiO2, CaCO3 and the like properly according to the compsns. of the ores and scraps which are raw materials. According to such method, no hardly melting alloys are made unlike in the cases of using lead, and the need for oxidizing removol by an ash blowing method is eliminated.

Description

[Detailed Description of the Invention] The present invention provides a method for easily separating and collecting precious metal components from precious metals, that is, ores containing platinum group metals, gold, and silver, scraps of electronic parts, used catalysts, etc., with high yield. 0 When separating and extracting precious metals from precious metal-containing ores or scraps, the ore or scraps are melted together with lead and the precious metals are collected in the lead to form precious lead.
The duality of the method of separating each element by hydrometallurgy and the method of separating each noble metal element by directly dissolving and extracting with a strong acid is highlighted.

However, the former is a source of pollution because the lead used to collect precious metals becomes lead oxide and volatilizes during ash blowing, and if it is coated with common salt to prevent the lead oxide from volatilizing, precious metals can be removed. Some of the components become chlorides and are lost by volatilization, and gold metals such as palladium and lead may act on the awns to form poorly soluble intermetallic compounds, making subsequent acid treatment difficult. This method had many practical problems. The latter method is superior at first glance, as it creates a leachate by directly exposing the precious metal to a strong acid bath, and separates and purifies each element. If they easily get mixed up and it is difficult to separate them, a large amount of edges are used instead of swords and rigs, which is dangerous. Particularly when raw material quality is low, impurity IJlfll
This makes separation of the leachate difficult and requires a lot of time for treatment.

Therefore, attempts have been made to simplify the separation operation between the leachate and the residue and to shorten the time required, but no satisfactory results have been obtained.

The inventors of the present invention believe that solving the deficiencies of the former method has more advantages than the latter method, and have conducted various studies.
They came to the conclusion that as long as lead was used, good results could not be obtained no matter how different the processing conditions or additives were, and after further research taking into account the ease of subsequent separation, they succeeded in separating silver and precious metals using silver. We developed a method for alloying and removing gangue as slag.

The method for collecting precious metals of the present invention involves melting ore or scrap mixed with a silver feed material and a flocculant, collecting precious metal components in chains, and separating other components from the silver alloy as slag. It is something.

Compared to the method of collection using lead, this method does not create a poorly soluble alloy and the subsequent wet treatment is easy. De-identify by law. It has very good advantages, such as no need for water pollution, no generation of polluting vapors, and no loss of precious metals. Furthermore, compared to the method of extraction using strong barley, there is less loss and contamination of impurities during the separation process, and the operation is simple.

As described above, the present invention is a refining method that is non-polluting and has a high recovery rate of precious metals, and can significantly shorten the procedure and time, as well as simplify the subsequent refining process.

The silver supply material conveniently used in the present invention may be pure silver bullion, but scrap or the like with a relatively high silver content can be used. It is desirable to use an amount of silver that is at least twice the amount of precious metals other than silver to be collected.

Boronization of the flocculant is commonly carried out in the industry to combine components other than the target metal during melting and separate them as slag. As a flocculant, S i
Ow 1Fe203, CaC0a, Na2CO3, Na
Reduction to commonly used solvent components such as 2B4O7,
Oxidizing agents and the like are appropriately blended depending on the composition of the raw material ore and scrap. The composition must be determined in advance so that the slag has a smooth, glass-like appearance that is easily separated from the alloy part. Practically speaking, the silicic acidity of the slag calculated by the following formula is 0.
The temperature is adjusted to 5 to 25 degrees, preferably 8 to 1.5 degrees.

Lissilicic acidity of oxygen in 5102 = -1 - - -1 - - Amount of oxygen in basic oxide Ore, scrap and silver feed materials are uniformly mixed with the forming agent and powder. It is preferable that the powder be crushed in advance to a sufficient degree during mixing.

The melting temperature l is suitably 1100°C or higher. At temperatures lower than this, the fluidity of the slag is insufficient.

Precious metals collected as alloys with silver by Kenpo are separated and refined into each component metal according to known refining methods.

Next, the present invention will be explained by examples.

In each example, scrap and silver feed materials were quantitatively analyzed in advance to determine the blending agent. Among the flocculant ingredients,
Fe, 0. is for forming slag with SiO□, and Na2C! O, Na, B, 07 were added to make the slag flow easily, wheat flour was added to create a reducing atmosphere to prevent the loss of useful metals, and KNO3 was added to oxidize coexisting undesirable metals.

Example 1゜10% by weight of palladium pre-pulverized to about 50 meshes
, BaTiOs-based porcelain scrap 2 containing 2% by weight of platinum
．． 5 h and 90 weight c6 silver-containing scrap 50 as a silver supply material were uniformly mixed with 7 and a granulating agent having the following composition.

[Bottling agent] Fe2O, 0.7K, Si0□
41 inch Na2Co36.5 h9 Na2B, 0. 2 hq flour to 10? The mixture was placed in an unglazed crucible and heated to 1200℃ in an electric furnace.
After being melted in the bath for 60 minutes, it was taken out from the furnace, poured into a cone mold, poured into a cone mold, cooled, and taken out from the mold. When it was taken out from the mold, the ferrule was separated into the lower layer and the slag was separated into the upper layer.

As a result of analyzing the alloy part and slag, it was found that silver, palladium, and white gold were present in the alloy part, and the collection rate was about 99%, and there was almost no loss of silver.

Example 2 Two to five scraps containing 90% by weight silver were used as a pass feed material.
K9, Example 1 except that the flocculant having the following composition was used. The same process was performed.

[Bottling agent] Fe2O, 2,5KgSin22.
7 Kg Na2 co, 4.3 Kr Na213. O? 1.4 Kg Flour 0.5 Kg As a result, precious metals were collected at a high yield of 99% with almost no loss.

Example filtration 70% by weight silver-containing scrap was used as a silver supply material.
．． 5Ky, flocculant and 1. Example 1 except that the following composition was used. The same process was performed.

[Bottling agent] Fe2O32,5Kr51o,
1.6 Ks+ Na2 Co, 2.71=y N, a2 B, o-t 2.3 '1qK
N0. 0.5 Kp As a result, precious metals were collected at a high yield of 99% with almost no loss.

Although the above embodiments are all examples of collection from porcelain scrap, it goes without saying that ore and other precious metal-containing scraps can also be collected in the same way.

Watch applicant Shoei Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1 A method for extracting precious metals by mixing and melting precious metal-containing ore or scrap, silver supply material, and a flocculant, collecting the precious metal components in chains, and separating the base metal components as slag 0