Slurry electrolysis - a new technology for efficient extraction of high-purity antimony

Introduction to Slurry Electrolysis

Slurry electrolysis is a new hydrometallurgical technology developed in the past two decades. It combines the three processes of leaching, solid-liquid separation, solution purification, and electrolysis that are usually included in hydrometallurgy into one. It uses the anodic oxidation reaction of the electrolysis process to leach the ore. Its essence is to replace the anode reaction of the electrolysis process with the leaching reaction of the ore, so that the large amount of energy consumed by the anode reaction in the usual electrolysis process is converted into effective leaching of metals. At the same time, the cell voltage is reduced, the electrolysis power is reduced, and the entire process is greatly simplified. For traditional electrolysis or electrolysis, this is a major change. It not only greatly simplifies the process and has a high metal recovery rate, but also makes full use of energy, good environmental protection, and obvious economic benefits. Due to the different oxidation potentials of different metal sulfides and the different reduction potentials of different metal ions, the physicochemical properties of different metal compounds in a specific medium, such as solubility, also vary greatly. The existence of these differences makes slurry electrolysis able to achieve selective leaching of minerals and selective extraction of metal ions to a certain extent.

Advantages of slurry electrolysis process

Antimony slurry electrolysis combines ore leaching and metal electrolysis processes. In a specific (hydrochloric acid-ammonium chloride) electrolyte system, according to the electrochemical principle, an oxidation reaction occurs at the anode to dissolve antimony and other metals in the antimony concentrate into the solution, while the cathode achieves the reduction and precipitation of antimony ions. This design that integrates multiple reactions into one fully utilizes the synergistic effect of chemical reactions and electrochemical reactions, and provides a scientific basis for the efficient extraction of antimony from a theoretical level. By controlling the key parameters such as the slurry liquid-to-solid ratio (3-5): 1, the electrolytic slurry temperature of about 60°C, the reaction conditions can be optimized to improve the leaching rate and electrolysis efficiency of antimony.

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