Recovery method for electrolytically extracting metal from catalyst after synthesizing diamonds from powder

Abstract

The invention discloses a recovery method for electrolytically extracting metal from a catalyst after synthesizing diamonds from powder. The recovery method comprises the following steps of: (a) putting broken diamond synthesis bar powder into an anode bag, simultaneously putting an anode plate into the anode bag, and putting the anode bag into an electrolytic cell; (b) injecting water into the electrolytic cell until the anode bag is completely soaked in the water, then adding conducting salt, adding a buffer agent which is 3-10% of weight of the added water, so as to obtain electrolyte; and (c) circularly heating the prepared electrolyte to 51-65 DEG C, putting a cathode plate into the prepared electrolyte after maintaining the temperature for 3-5 hours, sealing the electrolytic cell, electrifying, and depositing metal ions on the cathode plate to realize electrolytic recovery, wherein the cathode-current density is controlled at 1-8 A/am<2>, and the temperature of the electrolyte in the electrifying process is maintained at 51-65 DEG C all the time. The invention is suitable for a recovery method for electrolytically extracting noble metals in the catalyst after synthesizing the diamonds from the powder.

Description

[0001] Technical field: [0002] The invention relates to the technical field of processing after diamond powder synthesis, in particular to a recovery method for electrolytically extracting precious metals in a catalyst after diamond powder synthesis. Background technique [0003] At present, when using powder technology to synthesize diamond, whether iron-based, manganese-based or nickel-based alloy powder is used as the catalyst, the catalyst contains more or less precious metal nickel, and it is necessary to crush the synthetic block of powder synthetic diamond and put it into The filter bag is used as the anode, and then put into the electrolyte solution mainly composed of hydrochloric acid for electrolysis, which can not only reduce the use of acid solution in the subsequent treatment, but also extract the precious metal nickel in the catalyst for recycling, so as to achieve the goal of resource saving Purpose. During the electrolysis process of the mixed material com...

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Problems solved by technology

But this method has the following disadvantages: 1. the current electrolyte is composed of hydrochloric acid, conductive salt, and buffering agent. Due to the strong volatility of hydrochloric acid, it can stimulate the respiratory system of personnel. The environmental pollution is difficult for workers to bear, and the energy consumption and acid consumption of equipment increase, resulting in high cost; 2. Since the mixed material is in the form of discrete particles, the particle size is 30-400 mesh, and some are even finer than 400 mesh Particles, due to gravity in the electrolysis anode bag, the conductive area is too small, which leads to the obstruction of the electrolyte circulation, the electrolysis rate is too slow, and the electrolysis efficiency is too low, which seriously affects the smooth progress of electrolysis and low production efficiency; 3. Due to the excessive volatilization of hydrochloric acid , in order to ensure the pH required for the smooth progress of electrolysis, it is necessary to add hydrochloric acid every day, which not only increases the amount of hydrochloric acid used, but also pollutes the environment and increases the labor intensity of employees. cost of production