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High temperature alkaline tin removal method for lead-bismuth alloy

A lead-bismuth alloy, alkaline technology, applied in the field of lead-bismuth alloy high-temperature alkaline tin removal, can solve the problems of lead and bismuth volatilization loss, tin removal efficiency is not high

Inactive Publication Date: 2016-09-07
TONGLING NONFERROUS METALS GRP TONGGUAN NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that the existing tin removal method is not efficient in removing tin, and lead and bismuth will be volatilized and lost during the extraction process, so a high-temperature alkaline tin removal method for lead-bismuth alloy is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: (1), remove copper from the lead-bismuth alloy containing tin; (2), add industrial NaCl to the lead-bismuth alloy that has undergone copper removal in the lead melting pot to cover the surface of the melt, and raise the temperature to 750°C; (3) , Stir, stir the melt to ensure that the melt on the edge of the entire lead-melting pot can also flow with it. At this time, the melt is bright red, with low viscosity and clear as water. Stir until the volatilized white smoke is thin and the melt There will be a thin layer of floating layer; (4), one stage of tin extraction, add an appropriate amount of alkaline slagging agent NaOH to the melt according to the tin content in the lead-bismuth alloy, and continue stirring until particles form on the surface of the melt (5) Second-stage tin extraction, continue to add industrial NaCl to the melt, heat up to 750°C while stirring, then add alkaline slagging agent NaOH to the melt, repeat the steps (2) and (3).

Embodiment 2

[0011] Example 2: (1), remove copper from the lead-bismuth alloy containing tin; (2), add industrial NaCl to the lead-bismuth alloy that has undergone copper removal in the lead melting pot to cover the surface of the melt, and raise the temperature to 750°C; (3) , Stir, stir the melt to ensure that the melt on the edge of the entire lead-melting pot can also flow with it. At this time, the melt is bright red, with low viscosity and clear as water. Stir until the volatilized white smoke is thin and the melt There will be a thin layer of floating layer; (4), one stage of tin extraction, add an appropriate amount of alkaline slagging agent NaOH to the melt according to the tin content in the lead-bismuth alloy, and continue stirring until particles form on the surface of the melt (5) Second-stage tin extraction, continue to add industrial NaCl to the melt, heat up to 780°C while stirring, then add alkaline slagging agent NaOH to the melt, repeat the steps (2) and (3).

[0012] ...

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Abstract

The invention discloses a high-temperature alkaline tin removal method for lead-bismuth alloy, which comprises the following steps: (1) removing copper from the lead-bismuth alloy containing tin; Industrial NaCl covers the surface of the melt, and the temperature is raised to 750°C; (3), stirring; (4), a stage of tin extraction, according to the tin content in the lead-bismuth alloy, add an appropriate amount of alkaline slagging agent NaOH to the melt, and continue Stir until granular tin slag is formed on the surface of the melt, and remove the tin slag; (5), second-stage tin extraction, continue to add industrial NaCl to the melt, and then add alkaline slag-forming agent NaOH to the melt, repeat the steps (2) and (3). The beneficial effect of the invention is that the refining agent is added for covering during the smelting process, which can significantly reduce the volatilization loss of lead and bismuth under high temperature conditions. Tin slag can further recycle metal tin, and the lead-bismuth alloy cast anode plate after tin extraction fully meets the requirements of the electrolysis process for impurity content.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a high-temperature alkaline tin removal method for a lead-bismuth alloy. Background technique [0002] The traditional tin extraction process is: a tin-containing lead-bismuth alloy is smelted in an oxygen-enriched reduction furnace, and the tin is extracted in the cathode lead alkaline refining process after copper removal and electrolysis. This alkaline tin extraction process in the latter part of the electrolysis has the following disadvantages: tin is more easily dispersed in the anode slime, electrolyte, and cathode lead during the electrolysis process and cannot be enriched, and the recovery rate in the cathode lead is low; Non-toxic tin dross contains low tin (about 1-2%), and the sales price coefficient is low. [0003] Chinese Invention Patent Publication No. CN101386924A discloses a method for removing tin from materials containing Pb, Cu, Sb, Bi, Sn, Ag, Au, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C3/00C22C11/08C22B9/10
Inventor 高大银周明叶志中夏兆泉张昕红王文胜汪和僧章广
Owner TONGLING NONFERROUS METALS GRP TONGGUAN NEW TECH