Method for extracting gold, silver and copper from mobile phone circuit board
A circuit board, gold, silver and copper technology, applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of high cost, complex metal extraction process, environmental pollution, etc.
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Embodiment 1
[0053] (1) Pretreatment of waste mobile phone circuit boards: in the fume hood, remove the batteries, resistors, capacitors and other components on the waste mobile phone circuit boards with pliers, and place the circuit boards in a thermal resistance furnace for aerobic calcination. Calcined at 600°C for 2 hours, cut the calcined sample into small pieces of about 1cm*1cm, weighed 400 grams of the sample, placed it in a sealed universal high-speed pulverizer for mechanical crushing, and pulverized at 2000r / min In 20 seconds, the sample is divided into 2 parts, 200 grams each, and screened through a standard grading sieve respectively. The particle size is larger than 35 mesh and then crushed again. Selection, air separation and other processes, in which the metal-rich part is reserved for later use.
[0054] (2) Chemical analysis of metal elements: take the pretreated mobile phone circuit board powder and put it in the reaction vessel, add 40% nitric acid solution into the rea...
Embodiment 2
[0059] The preparation method of Example 2 is the same as that of Example 1, and the specific raw material ratio is shown in Table 1;
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