Method of separating and recovering plumbum and zinc from Pb-Zn alloy

A technology for separation, recovery and alloying, applied in the field of alloys, can solve the problems of accumulation of impurities, affecting the properties of zinc, and high impurity content, and achieve the effect of improving purity

Active Publication Date: 2018-10-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the obtained zinc still contains impurities such as Pb, Cd, Fe, Cu, etc., and the impurity content is relatively high, which seriously affects the properties of zinc, so it is necessary to continue to set up a special impurity removal process to refine and remove impurities for zinc, such as continuing to heat zinc Distillation and refining; and the obtained lead is also mixed with a large amount of impurities and continues to return to the lead rain condensation system, so that impurities accumulate in the entire system

Method used

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  • Method of separating and recovering plumbum and zinc from Pb-Zn alloy
  • Method of separating and recovering plumbum and zinc from Pb-Zn alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown, this is separated and recovered the method for lead and zinc by lead-zinc alloy, and its concrete steps are as follows:

[0021] Step 1. Perform a vacuum distillation of the lead-zinc alloy (the components are shown in Table 1) at a temperature of 600°C and a pressure of 30Pa to obtain primary volatiles and primary residues;

[0022] Step 2. The primary volatile matter obtained in step 1 is subjected to graded condensation to obtain metal zinc and metal cadmium; the primary residue obtained in step 1 is subjected to secondary vacuum distillation at a temperature of 800° C. and a pressure of 30 Pa to obtain secondary Volatile matter and secondary residues of copper-iron alloys; among them, graded condensation first condenses at a condensation temperature of 365°C to 415°C to obtain metal zinc, and in the process of metal zinc condensation, it first undergoes two temperature gradients [390°C, 415°C] and (365°C ℃, 390℃) to obtain metal zinc by grad...

Embodiment 2

[0028] Such as figure 1 Shown, this is separated and recovered the method for lead and zinc by lead-zinc alloy, and its concrete steps are as follows:

[0029] Step 1. Perform a vacuum distillation of the lead-zinc alloy (the components are shown in Table 2) at a temperature of 500°C and a pressure of 10 Pa to obtain primary volatiles and primary residues;

[0030] Step 2, the primary volatile matter obtained in step 1 is subjected to graded condensation to obtain metal zinc and metal cadmium; the primary residue obtained in step 1 is subjected to secondary vacuum distillation at a temperature of 900 ° C and a pressure of 10 Pa to obtain secondary Volatile matter and secondary residues of copper-iron alloy; Among them, graded condensation is firstly condensed at a condensation temperature of 325°C to 415°C to obtain metal zinc, and in the process of metal zinc condensation, it is firstly cooled and condensed under a temperature gradient (365°C, 415°C] Metal zinc is obtained, ...

Embodiment 3

[0036] Such as figure 1 Shown, this is separated and recovered the method for lead and zinc by lead-zinc alloy, and its concrete steps are as follows:

[0037] Step 1. Perform a vacuum distillation of the lead-zinc alloy (the components are shown in Table 3) at a temperature of 700°C and a pressure of 1Pa to obtain primary volatiles and primary residues;

[0038] Step 2, the primary volatile matter obtained in step 1 is subjected to graded condensation to obtain metal zinc and metal cadmium; the primary residue obtained in step 1 is subjected to secondary vacuum distillation at a temperature of 1000 ° C and a pressure of 1 Pa to obtain secondary Volatile matter and secondary residues of copper-iron alloy; Among them, graded condensation is firstly condensed at a condensation temperature of 355°C to 415°C to obtain metallic zinc. Metal zinc is obtained, and then condensed at a constant temperature of 355°C to obtain metal zinc; the remaining volatile matter is condensed at a t...

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Abstract

The invention relates to a method of separating and recovering plumbum and zinc from a Pb-Zn alloy, and belongs to the technical field of alloys. The method comprises the following steps that the Pb-Zn alloy is subjected to primary vacuum distillation under the condition that the temperature is 500-700 DEG C and the pressure is 1-30 Pa, and primary volatile matters and primary residues are obtained; after the primary volatile matters are subjected to fractional condensation, metal zinc and metal cadmium are obtained; the primary residues obtained in Step 1 are subjected to secondary vacuum distillation under the condition that the temperature is 800-1000 DEG C and the pressure is 1-30 Pa, and secondary volatile matters and secondary residues of a Cu-Fe alloy are obtained; and the obtainedsecondary volatile matters are condensed at 300 DEG C, and the metal plumbum is obtained. Through gradient condensation, the zinc and plumbum in the volatile matters can be sufficiently condensed, sothat the purity degrees of the zinc and plumbum obtained by separating and recovering are raised advantageously.

Description

technical field [0001] The invention relates to a method for separating and recovering lead and zinc from a lead-zinc alloy, belonging to the technical field of alloys. Background technique [0002] At present, metal lead and metal zinc are usually prepared from lead-zinc alloy through refining. The lead-zinc alloy is usually prepared by the closed blast furnace zinc smelting method. The main process of the closed blast furnace zinc smelting method is: using lead-zinc concentrate as raw material, sequentially sintering and reducing to obtain zinc vapor, and then the zinc vapor is heated in the lead rain. Condensate to prepare lead-zinc alloy. The lead-zinc alloy prepared by the above method contains Pb, Cd, Fe, Cu, Zn and other elements at the same time, which has a higher requirement for the refining level of the lead-zinc alloy. [0003] The existing treatment method is to separate the zinc and lead in the lead-zinc alloy into upper and lower layers according to the diff...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B7/00C22B19/04C22B13/02
CPCC22B7/001C22B9/02C22B13/02C22B19/04Y02P10/20
Inventor 蒋文龙杨斌查国正刘大春徐宝强李一夫田阳杨佳郭新宇邓聚海张永伟梅青松邓勇熊恒王飞
Owner KUNMING UNIV OF SCI & TECH
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