Method for resisting lead ion depletion of lead electrolyte

Abstract

The invention discloses a method for resisting lead ion depletion of lead electrolyte. The method comprises the following steps: (1) preparing a lead anode plate by 88-92 percent of Pb, less than 4-5 percent of Sb, less than 4-6 percent of Bi, less than 0.06 percent of Cu, less than 0.035 percent of Sn and less than 1.5 percent of As; (2) controlling the temperature of the electrolyte at 45 DEG C, wherein the flowing speed of the electrolyte is 25 L / min, the electrolysis density is 200-210 A / m<2>, and an additive and the species are not changed. The method is characterized in that the change of lead ions is controlled by adjusting an immersion area of an anode and a cathode in an electrolytic tank and a polar distance between an anode plate and a cathode plate. Due to the method, the lead ions in the lead electrolyte can be stably controlled within a reasonable range, so that the depletion of the lead electrolyte is avoided.

Description

technical field [0001] The invention relates to a nonferrous metal smelting method, in particular to a method for depleting lead ions in lead electrolyte. Background technique [0002] The purity of crude lead produced by crude lead smelting is in the range of 96%-99%, and the remaining 1%-4% is precious metals such as gold, silver, selenium, tellurium and other rare metals and impurities such as copper, nickel, selenium, antimony and bismuth. The value of precious metals sometimes exceeds the value of lead and must be extracted, while the impurity components have a harmful effect on the ductility and corrosion resistance of lead and must be removed, so crude lead must be refined. [0003] There are two types of crude lead refining: fire refining and electrolytic refining. Lead smelters in China and Japan generally use electrolytic refining, while other countries in the world use fire refining. The fire refining equipment and process are simple, the construction cost is low,...

AI Technical Summary

Problems solved by technology

[0003] There are two types of crude lead refining: fire refining and electrolytic refining. Lead smelters in China and Japan generally use electrolytic refining, while other countries in the world use fire refining. The fire refining equipment and process are simple, the construction cost is low, and the energy consumption is low. Low, short production cycle, its disadvantage is that the process is complicated, there are many varieties of intermediate products, all of which need to be treated separately, and the metal recovery rate is low; the electrolytic refining productivity is high, the metal direct recovery rate is high, it is easy to mechanize and automate, and can produce high purity at one time Refined lead, but the construction investment is large and the production cycle is long

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