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Method for separating copper and silver from dross produced by producing copper from smelting lead

A technology of copper dross and lead smelting, which is applied in the field of separating copper and silver from copper dross produced by lead smelting, can solve the problems of increasing the cost of sewage treatment, etc., and achieve the effects of convenient operation, environmental friendliness, and high metal efficiency

Inactive Publication Date: 2012-03-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process produces a large amount of wastewater and waste liquid, which increases the cost of sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Take 50g of the lead smelting copper scum solid material that contains about 20% copper, about 70% lead, and about 3000g / t silver containing copper scum produced by lead smelting after reduction treatment, and place it under vacuum condition. Raise the temperature to 1100°C at a heating rate of 10°C / min, and hold for 30 minutes; when the pressure reaches 4Pa, continue to raise the temperature to 1450°C at a heating rate of 15°C / min, and hold for 1 hour; when the pressure reaches 10Pa, stop heating; When the temperature drops to 90°C, turn off the vacuum; during this period, collect volatile matter and condense to obtain a lead-silver alloy, and the remaining solid is a copper alloy from which lead and silver have been removed; among them, the amount of residual silver in the copper alloy is 180g / t; The lead content in the alloy is >99%, and the silver content is 7800g / t;

[0022] B. The lead-silver alloy obtained in step A is used as a raw material to enter the con...

Embodiment 2

[0024] A. Take 10Kg of copper-silver-lead alloy containing about 30% copper, about 60% lead, and about 4000g / t silver (copper dross solid material produced by lead smelting), and place it under vacuum conditions at a heating rate of 12°C / min. , heat up to 1200°C, keep warm for 40min; after the pressure is 3Pa, continue to heat up to 1600°C at a heating rate of 18°C / min, and keep warm for 1.5h; when the pressure is 18Pa, stop heating; wait for the temperature to drop below 97°C , close the vacuum; in the meantime, collect the volatile matter, condense to get the lead-silver alloy, and the remaining solid is the copper alloy with lead and silver removed; the amount of residual silver in the copper alloy is 27.5g / t, and the lead content in the lead-silver alloy is >99 %, the amount of silver is 8000g / t;

[0025] B. The lead-silver alloy obtained in step A is used as a raw material to enter the conventional electrolytic refining process, and the silver is enriched in the anode s...

Embodiment 3

[0027] A. Take 20Kg of copper-silver-lead alloy containing about 40% copper, about 50% lead, and about 4500g / t silver (copper dross solid material produced by lead smelting), and place it under vacuum conditions at a heating rate of 15°C / min. , heat up to 1150°C, and keep warm for 60 minutes; after the pressure reaches 4Pa, continue to heat up to 1400°C at a rate of 20°C / min, and keep warm for 3h; when the pressure reaches 15Pa, stop heating; when the temperature drops to 80°C, Close the vacuum; in the meantime, collect volatile matter and condense to obtain lead-silver alloy, and the remaining solid is copper alloy with lead and silver removed; the amount of residual silver in the copper alloy is 5.8g / t, and the lead content in the lead-silver alloy is >99% , the amount of silver is 12613g / t;

[0028] B. The lead-silver alloy obtained in step A is used as a raw material to enter the conventional lead smelting process, and the silver is enriched in the anode slime to obtain ...

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PUM

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Abstract

The invention provides a method for separating copper and silver from dross produced by producing the copper from smelting lead. The method comprises the following steps of: putting solid dross materials produced by producing the copper from smelting the lead under a vacuum condition, collecting volatile materials after heating and insulating the solid dross materials for many times, and condensing the volatile materials to obtain a lead-silver alloy, wherein remaining solid is a lead- and silver-removed copper alloy; taking the lead-silver alloy as a raw material to enter a conventional lead smelting process or an electrolytic refining process, wherein the silver is enriched in anode mud, so that recovered silver is obtained; and directly taking the lead- and silver-removed copper alloy as raw materials to obtain recovered metal copper by using a conventional method. The method has the advantages of high adaptability of raw materials, simplicity, environmental protection, high metal separating and recovering efficiency, short process flow, convenience for operation and obvious economic benefit, and can be used for treating various lead-, silver- and copper-containing copper-based or lead-based alloys; a vacuum distilling method is adopted; and silver content and lead content in the remaining solid are 200g / t and 0.01% respectively.

Description

technical field [0001] The invention relates to a method for separating copper and silver in copper dross produced by smelting lead, and belongs to the field of metal in vacuum metallurgy technology. Background technique [0002] Copper scum (also known as pot surface slag) is the product of crude lead refining intermittent copper removal, which contains about 10-50% Cu, 40-70% Pb, 100-10000g / t Ag and other elements (As, Sb, Sn , Zn, etc.). Due to the different slag removal methods and equipment, the forms of scum are also different, and there are common forms such as loose fine particles and lumps. Pyrometallurgical equipment for copper dross can be blast furnace, reverberatory furnace, rotary kiln and electric furnace; acid leaching and ammonia leaching can be used for hydrometallurgical treatment. The fire method is mostly used to deal with bulk materials, and the wet method is used to deal with loose fine particles. [0003] The soda ash-iron filing method is mostly u...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B11/00C22B15/00C22B9/02
CPCY02P10/20
Inventor 熊恒杨斌戴卫平徐宝强刘大春邓勇戴永年龙萍曲涛蒋文龙
Owner KUNMING UNIV OF SCI & TECH
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