Method for analyzing gold in tin and tin alloy waste

An analytical method and technology of tin alloy, applied in the field of chemical analysis, can solve the problems of incomplete enrichment and low gold determination results, and achieve the effects of ideal separation and enrichment effect, accurate analysis results and simple operation.

Inactive Publication Date: 2013-05-22
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the interference of the main element tin, it is easy to cause incomplete enrichment.

Method used

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  • Method for analyzing gold in tin and tin alloy waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: Take by weighing 2.0253g metal tin, 20g sodium carbonate, 5g borax, 5g silicon dioxide, 100g lead oxide, 2.5g flour, 0.1g pure silver, after mixing evenly, put into assay gold crucible, top with 15g Cover with anhydrous sodium sulfate, put the crucible into a gold assay furnace at 900°C, close the furnace door, keep warm for 10 minutes, then raise the temperature to 1100°C within 40-50 minutes, keep warm for 10 minutes, take out the crucible, and place the crucible on a stable Rotate several times, and gently tap 2~3 times on the iron plate to make all the lead sink to the bottom of the crucible. After cooling, break the crucible and take out the lead buckle; hammer the lead buckle into a square, put it in 900℃ Burn for 20 minutes in a magnesia ash dish, close the furnace door for 2 minutes, open the furnace door slightly after the molten lead is stripped, and keep the furnace temperature at 850°C. Knock off the waste residue on the surface of the silver b...

Embodiment 2

[0012] Embodiment 2: take by weighing 4.9876g tin anode slime, 40g sodium carbonate, 15g borax, 5g silicon dioxide, 200g lead oxide, 2.5g flour, 0.1g pure silver, the operation method is the same as embodiment 1.

[0013] Table 1 is the measurement results of metallic tin and tin anode slime. It can be seen from the results in Table 1 that the measurement results are stable and the relative standard deviation is less than 1.5%.

[0014] Table 1 Determination results of samples (g / ton)

[0015] Example 1 2 3 4 average value relative standard deviation(%) 1 32.5 32.1 32.9 32.5 32.54 0.85 2 156.7 155.8 156.4 155.3 155.9 0.51

[0016] Weigh the sample and mix the ingredients evenly, transfer it into the assay gold crucible, add 5ml of 10μg / ml gold standard into the mixture, and then measure according to the experimental procedure. The experimental data and recovery rate are shown in Table 2.

[0017] Table 2 Results of standard recovery te...

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Abstract

The invention relates to a method for analyzing gold in tin and tin alloy waste, which is characterized by comprising the following steps: heating a sample together with sodium carbonate, boron, silicon dioxide, lead oxide, flour and pure silver, cooling, and taking out a lead button; cupelling while keeping the temperature at 850 DEG C so that the gold and the added silver form a silver-gold alloy; dissolving the silver-gold alloy in aqua-regia; and in a 5% or so hydrochloric acid medium, measuring the gold in the tin and tin alloy waste by air-acetylene flame atomic absorption spectrometry. The method provided by the invention has the advantages of ideal separation and enrichment effects and accurate and stable analytic result, and is simple to operate; and the relative standard deviation is less than 1.0%, and the recovery rate is 97.8-101.4%.

Description

technical field [0001] The invention relates to a chemical analysis method, in particular to a chemical analysis method of trace precious metal elements. Background technique [0002] There are a large number of tin and tin alloys in modern industrial waste, mainly from the electronics industry, which are divided into pure tin waste, tin-based alloy waste, tin solder, tin slag and tin mud, etc., in the form of block, chip and powder , The content of tin also varies greatly. In addition to the main tin, these wastes also contain some other metal elements, such as: lead, copper, bismuth, arsenic, zinc, etc. Some tin and tin alloy products add some precious metals to form tin-gold alloys And tin-silver alloy, etc. These scraps contain a lot of precious metals, and recycling these precious metals has important social and economic value. Among them, precious metals are important pricing elements in the trade of tin and tin alloy scraps. Accurate and rapid determination of the pr...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/33
Inventor 肖红新庄艾春唐维学赖心
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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