Regenerated lead fire method basic refining bottom-blowing process

Abstract

The invention discloses a regenerated lead fire method basic refining bottom-blowing process. The process comprises the following steps: discharging lead of crude lead liquid from a melting furnace, casting the lead in a refining furnace, introducing argon from the bottom of the furnace, when the temperature of the lead liquid is reduced to about 330 DEG C, removing the slag, reducing the lead-containing copper to about 0.1% through liquation decoppering, injecting sulfur powder at the bottom of the refining furnace for removing copper after slag removal, heating the material to 450-480 DEG C, reacting the material for 30-60 min, taking the sulfuration slag out to complete a copper-removal process; when the lead liquid temperature is about 45 DEG C, blowing powdery sodium nitrate and sodium hydroxide into the bottom of the refining furnace, reacting the materials for 30 min, and blowing NaCl powder at the bottom of the refining furnace by following with argon to complete arsenic, antimony and tin removal. According to the bottom-blowing process, a refining agent and / or alloy loss are greatly reduced; the lead liquid contains inert gas with little solid solubility, the lead liquid and a lead ingot are difficulty oxidized, no lead slag is generated in the lead liquid and the lead ingot, lead slag is little when the regenerated lead is used, the slag yield is low; the lead liquid surface is protected by argon during a refining process, high temperature Ag removal can be carried out, the content of Ag in the regenerated lead is low; argon at the bottom and the minimal bismuth compound particles are floated, and the bismuth content in the lead ingot is low.

Description

technical field [0001] The invention relates to a secondary lead refining process, in particular to a secondary lead fire alkaline refining bottom blowing process, which belongs to the technical field of metal smelting. Background technique [0002] Secondary lead needs to be refined before it can be widely used. The purpose of refining is to remove impurities; the second is to recover precious metals, especially silver. There are two methods of crude lead refining: pyrolysis and electrolysis. Electrolytic refining technology is widely used in my country, Japan, Canada and other countries. Its advantages are: high product quality, stable production process, and good operating conditions; the disadvantages are: long production cycle, large capital occupation, large investment, and slightly high production costs. The advantages of pyro-refining are simple equipment, less investment, and small floor space. Different processes can be adopted according to the composition of cru...

AI Technical Summary

Problems solved by technology

Electrolytic refining technology is widely used in my country, Japan, Canada and other countries. Its advantages are: high product quality, stable production process, and good operating conditions; the disadvantages are: long production cycle, large capital occupation, large investment, and slightly high production costs

[0004] The above-mentioned differences are related to the current fire refining process in my country (refining agents are all added by stirring from the top, and there is no inert gas protection on the surface of the lead liquid): (1) A considerable part of the refining agent is blocked by lead slag and does not enter the lead liquid, and the refining agent is consumed (2) Air is easily trapped in the lead liquid, resulting in the internal oxidation of the lead ingot after pouring, resulting in lead slag; (3) High temperature de-Ag, lead liquid oxidation is serious; low-temperature de-Ag effect is not good, the lead liquid still contains More Ag; (4) When calcium and magnesium are removed from Bi, the tiny particles of bismuth compounds are difficult to float, and the lead liquid still contains more Bi; ) big loss

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