Method for determining gold-palladium contents in circuit boards of mobile phones

[0025] Use tools such as electric heat guns or electric furnaces to process the components of printed circuit boards in waste mobile phones in batches, and heat the solder at the contact position between the components and the light board. The temperature is controlled at 210 ° C. At the same time, with vibration, the components are heated and quickly fall off. The disassembled waste mobile phone circuit board components are crushed, ground, and sieved to reach 20-200 meshes to obtain the required samples; the obtained samples are mixed with aqua regia solution and placed on an electric heating plate for reaction. The reaction parameters are: aqua regia: sample solid-liquid ratio (mass / volume) = 1:13, reaction time 1 = 100min, reaction temperature 180°C; add perchloric acid to continue digestion, and its perchloric acid digestion parameters are: high chlorine Acid: Sample solid-to-liquid ratio (mass / volume) = 1:5, reaction time 1 = 60min, reaction temperature 200°C; add hydroc

[0027] Use tools such as electric heat guns or electric furnaces to process the components of printed circuit boards in waste mobile phones in batches, and heat the solder at the contact position between the components and the light board. The temperature is controlled at 200 ° C. At the same time, with vibration, the components are heated and quickly fall off. The disassembled waste mobile phone circuit board components are crushed, ground, and sieved to reach 20-200 meshes to obtain the required samples; the obtained samples are mixed with aqua regia solution and placed on an electric heating plate for reaction. The reaction parameters are: aqua regia: sample solid-liquid ratio (mass / volume) = 1:15, reaction time 1 = 105min, reaction temperature 170°C; add perchloric acid to continue digestion, and its perchloric acid digestion parameters are: high chlorine Acid: sample solid-liquid ratio (mass / volume) = 1:7, reaction time 1 = 70min, reaction temperature 190°C; add hydrochlo

[0029] Use tools such as electric heat guns or electric furnaces to process the components of printed circuit boards in waste mobile phones in batches, and heat the solder at the contact position between the components and the light board. The disassembled waste mobile phone circuit board components are crushed, ground, and sieved to reach 20-200 meshes to obtain the required samples; the obtained samples are mixed with aqua regia solution and placed on an electric heating plate for reaction. The reaction parameters are: aqua regia: sample solid-liquid ratio (mass / volume) = 1:17, reaction time 1 = 90min, reaction temperature 200°C; add perchloric acid to continue digestion, and its perchloric acid digestion parameters are: high chlorine Acid: sample solid-to-liquid ratio (mass / volume) = 1:9, reaction time 1 = 80min, reaction temperature 170°C; add hydrochloric acid to catch nitrate, and the filtrate after nitrate use suction filter or filter device to remove the remaining non-