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Method for collecting valuable metal

A valuable metal recovery method technology, applied in the field of valuable metal recovery, can solve problems such as inability to fully decompose cyanide, failure to recover valuable metals, harmful chlorine, etc., to achieve easy further processing, easy metal recovery, and low toxicity Effect

Active Publication Date: 2015-12-02
TANAKA PRECIOUS METAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following problems: cost is high; inorganic carbonate, such as an alkali metal carbonate or an alkaline earth metal carbonate salt, which is a hot-melt salt melts and adheres to the furnace, causing damage to the furnace; valuable metals cannot be recovered; Wait
However, when recovering valuable metals from medium- to high-concentration cyanide waste liquids by the alkaline chlorination method, there are problems as follows: a large amount of chemicals to be used is required, and the volume and increase of the waste liquids to be treated are accompanied by problems caused by reaction heat. significant heat generation; self-produced harmful chlorine; etc.
The former method has the problem of insufficient decomposition of cyanide, and the latter method has the problem of high cost

Method used

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  • Method for collecting valuable metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A gold plating waste solution having the following composition was prepared. The measurement results of the composition in the gold plating waste liquid are shown in Table 1 below.

[0057] [Table 1]

[0058] Measurement object

result

unit

gold

1.6

mg / L

platinum

＜1

mg / L

silver

0.8

mg / L

Palladium

2.0

mg / L

total cyanide

1800

mg / L

Carbonate ion

10

g / L

[0059] pass figure 1 The procedure shown is to treat the above-mentioned waste gold plating solution. First, using a rotary disk type evaporation and concentration device as a device, the gold plating waste solution 100 was evaporated and dried at 110° C. to obtain a concentrate 101 . Concentrate 101 was quantitatively analyzed. The results are shown in Table 2 below.

[0060] [Table 2]

[0061] Measurement object

result

unit

gold

34

mg / kg

platinum

25

mg / ...

Embodiment 2

[0067] Except for the firing conditions, it was implemented in the same manner as in Example 1 until washing with water. Calcination was carried out at 400°C under reduced pressure, the heating rate was set at 3°C / min, and the calcination time was set at 120 minutes after reaching 400°C. The obtained calcined residue 102 was quantitatively analyzed. The results are shown in Table 3.

Embodiment 3

[0069] Except for the firing conditions, it was implemented in the same manner as in Example 1 until washing with water. Calcination was carried out at 650°C under reduced pressure, the heating rate was set at 3°C / min, and the calcination time was set at 60 minutes after reaching 650°C. The obtained calcined residue 102 was quantitatively analyzed. The results are shown in Table 3.

[0070] [table 3]

[0071] Measurement object

Example 1

Example 2

Example 3

gold

46mg / kg

28mg / kg

20mg / kg

platinum

20mg / kg

34mg / kg

44mg / kg

silver

31mg / kg

6mg / kg

24mg / kg

Palladium

13mg / kg

28mg / kg

60mg / kg

total cyanide

<2mg / kg

<2mg / kg

<2mg / kg

Carbonate ion

18000mg / kg

17400mg / kg

11000mg / kg

[0072] [Table 4]

[0073] Measurement object

result

unit

gold

2300

mg / kg

platinum

530

mg / kg

silver

2500

...

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Abstract

The present invention provides a method for collecting a valuable metal, which enables a medium- to high-concentration cyan waste fluid to be treated at low cost and in a simple manner, and also enables a so-called valuable metal, e.g., a noble metal, a rare earth element and another metal, remaining in the waste fluid to be collected satisfactorily without causing the corrosion of a furnace. The present invention relates to a method for collecting a valuable metal, which comprises: burning a concentrate (101) of a waste fluid (100) containing a cyan compound, an inorganic carbonate salt and the valuable metal at 400 to 650°C; then separating the cyan in the form of a cyan gas (103) from the concentrate of the waste fluid (100); and then collecting the valuable metal from a burning residue (102).

Description

technical field [0001] The invention relates to a method for recovering valuable metals. Background technique [0002] Among the so-called valuable metals such as precious metals, rare earth elements, and other metals, there are many materials that are very useful in industry and are used in a wide range of fields. For example, electrolytic plating or electroless plating using gold is widely known, and as the plating solution, a cyanogen-based gold plating solution having excellent stability in liquid has conventionally been used as a gold supply source. [0003] However, cyanide is highly toxic, and the concentration of cyanide in the above-mentioned plating solution is usually medium to high. Therefore, the treatment of the waste solution after plating needs to be done without fail. On the other hand, valuable metals, which are expensive materials, are required to be recovered and reused as much as possible from the waste liquid after plating. [0004] Conventionally, as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/44
CPCC22B7/001Y02P10/214Y02P10/20
Inventor 佐藤浩安杉江麻美
Owner TANAKA PRECIOUS METAL IND