Method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper

A technology of scrap copper and oxygen-free copper, applied in the field of non-ferrous metal metallurgy, can solve the problems of high energy consumption, high oxygen content in products, long process and so on

Active Publication Date: 2014-04-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of long flow process, high energy consumption and high oxygen content in the current waste and miscellaneous copper resource

Method used

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  • Method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper
  • Method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper
  • Method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Using scrap copper bought back on the market as raw material, carry out refining experiments, wash and dry, take samples for ICP full analysis, and make a mixture as shown in Table 1:

[0063] Table 1 Chemical composition / wt% of scrap copper mixture

[0064] the element

Cu

Pb

sn

Ni

Zn

Sb

S

Al

Fe

Au,Ag

non-metal

content

93.58

0.52

0.84

0.33

0.14

0.11

0.67

0.14

0.10

0.05

3.52

[0065] (1) oxidation refining

[0066] Take P 2 o 5 7.5g, Na 2 CO 3 After mixing 7.5g, boil it at low temperature to make a molten salt with uniform composition. After the molten salt is cooled and ground, mix it with 200g of the mixture evenly, and add it to a 500ml corundum crucible; put the crucible into a closed heating furnace and quickly heat up to 1200°C , start blowing compressed air, the flow rate of blowing air is 0.5L / min, the pressure is 0.4Mpa, stop the blowing after 60min,...

Embodiment 2

[0074] Mixture composition is identical with embodiment 1, gets NaPO 3 15g, Na 2 CO 3 Mix 15g and 200g of the mixture evenly and put it into a 500ml corundum crucible, put the crucible into a closed heating furnace, rapidly raise the temperature to 1220°C and blow in compressed air at a flow rate of 0.5L / min and a pressure of 0.4Mpa After reacting for 60 minutes, stop the blowing, keep the heat for 20 minutes, remove the slag, and then blow (10V%CO+90V%N 2 ) mixed gas, the flow rate of blowing the mixed gas is 0.3L / min, the pressure is 0.3Mpa, the ventilation is stopped after 30min, and after standing for 10min, at the temperature of 1200℃, add 0.1g calcium boride into the melt, and simultaneously blow High-purity argon gas is used to stir the melt, the flow rate of argon gas is 0.25L / min, and the pressure is 0.3Mpa. After 30min, the flow of argon gas is stopped, and the temperature is kept for 20min.

[0075] After the crucible was cooled, samples were taken to analyze the...

Embodiment 3

[0078] Mixture composition is identical with embodiment 1, gets NaPO 3 10g, Na 2 CO 3 Mix 20g and 200g of the mixture evenly and put it into a 500ml corundum crucible, put the crucible into a closed heating furnace, rapidly raise the temperature to 1150°C and blow in compressed air at a flow rate of 0.5L / min and a pressure of 0.4Mpa After reacting for 60 minutes, stop the blowing, keep the heat for 20 minutes, remove the slag, and then blow (10V%CO+90V%N 2 ) mixed gas, the flow rate of blowing the mixed gas is 0.3L / min, the pressure is 0.3Mpa, stop the ventilation after 30min, and after standing for 10min at a temperature of 1200°C, add 0.2g lanthanum-cerium-copper alloy (cerium 8 %, 12% lanthanum, 80% copper), and at the same time blow high-purity argon to stir the melt, the flow rate of blowing argon is 0.25L / min, the pressure is 0.3Mpa, stop argon after 30min, and keep warm for 20min. Sampling and analyzing the composition of product copper after the crucible is cooled, ...

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Abstract

The invention relates to a method for directly producing high-purity oxygen-free copper by pyrogenic process continuous refining of scrap copper, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: by taking scrap copper as a raw material; analyzing the component characteristics of each batch of raw material, and then preparing into a mixture, wherein the mass percent of a copper element in the mixture is greater than or equal to 93%; adding metaphosphate or phosphorus pentoxide and flux to the mixture; refining by oxidation; stewing and drossing after oxidation is finished, and then orderly carrying out reduction refining and refining agent refining under an agitation state, so as to obtain the high-purity oxygen-free copper of which the copper content is greater than or equal to 99.95% and the oxygen content is smaller than 0.003%, wherein the electrical resistivity of the obtained copper wire after drawing is below 0.017241omega/(mm), and the relative electrical conductivity is over 100% of International annealed copper standard (IACS). The method is strong in flexibility, significant in refining effect, and applicable to different components of scrap copper materials; the scrap copper can be used for directly making a rod after being refined. Compared with the traditional pyrogenic process smelting-electrolytic refining-copper cathode purification process, the method disclosed by the invention has the beneficial effects that the flow is shortened, the cost is reduced, the energy is saved, and continuous operation is achieved.

Description

technical field [0001] The invention relates to a process for directly producing high-purity oxygen-free copper through pyromethod continuous refining of waste miscellaneous copper, which belongs to the field of nonferrous metal metallurgy. Background technique [0002] Waste miscellaneous copper is the collective name of waste copper and miscellaneous copper, which mainly comes from waste products produced during copper smelting and processing, as well as scrapped wires and cables, automobile radiators and refrigerators, copper-containing castings, waste bearings, waste motors, waste transformers, etc. . With the depletion of primary copper resources, scrap copper as a secondary resource will occupy an increasing proportion in copper smelting. In developed countries, the proportion of recycled copper accounts for more than half of the total output of copper. However, due to technical equipment and industrial orientation, the recycled copper industry in China is very small....

Claims

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Application Information

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IPC IPC(8): C22B15/14C22B7/00
CPCY02P10/20
Inventor 何静叶龙刚郭潇磊唐朝波唐谟堂陈永明杨声海杨建广
Owner CENT SOUTH UNIV
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