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Dry type refining method for copper

A dry-type, electrolytic refining technology, which is applied in the direction of improving process efficiency, can solve undisclosed problems, and achieve the effects of increasing productivity, reducing the amount of circulating treatment, and efficiently removing

Inactive Publication Date: 2008-12-10
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the currently known dry refining process of lead, as a method of removing tin from molten lead by utilizing its affinity with alkaline oxides, it is known to use sodium hydroxide and sodium nitrate at 500°C or below temperature, to contain sodium stannate (Na 2 SnO 3 ) The method of separating tin from lead in the form of Harris (Haris) slag (hereinafter referred to as the Harris method), has not yet been disclosed about the technology for efficiently removing tin in molten copper

Method used

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  • Dry type refining method for copper
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  • Dry type refining method for copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment -1

[0029] Copper obtained by incinerating combustible electronic component materials, power supply substrates, etc. in copper-noble metal scrap containing copper and at least one of gold, silver, platinum, palladium, rhodium, and ruthenium, and tin in a fixed incinerator - 60kg of precious metal scrap raw materials, 140kg of electroplating waste residues such as electronic component materials, 20kg of precious metal-containing waste liquid treatment residues generated in the wet smelting process of precious metals, 26kg of calcium carbonate as a flux, and 15kg of coke as a reducing agent. Smelting reduction furnace 1. Carry out smelting reduction treatment at 1,300-1,400°C for 3 hours, and then separate 146kg of reduced metal and 68kg of reduced slag. The reduced metal was melted in the oxidation furnace at a temperature range of 1,200°C-1,250°C, and then air was blown in at a flow rate of 0.8 L / min / kg metal for 2 hours from the blowing port, and then the oxidized crude was collec...

Embodiment -2

[0035] In order to make the tin grade of the crude oxidized metal prepared in Example-1 2% by mass, the crude oxidized metal and tin metal as a reagent were put into a graphite crucible and melted at 1,200°C for 1 hour using an externally heated electric furnace. . Then, the graphite crucible was taken out from the externally heated electric furnace and cooled to obtain a metal whose tin grade was adjusted to 2% by mass.

[0036] Except having used the metal whose tin level adjusted to 2 mass % prepared above, it processed and analyzed similarly to Example 1. The results are shown in Table 2.

[0037] [Table 2]

[0038]

[0039] As can be seen from the results in Table 2, for the tin removal treatment in Example-2, as long as 4.5 equivalents or more of sodium hydroxide is added to the theoretical amount of tin, an anode grade that can be electrolyzed in the electrolytic refining step of copper can be obtained.

Embodiment -3

[0041]In order to make the tin grade of the crude oxidized metal prepared in Example-1 4% by mass, the crude oxidized metal and tin metal as a reagent were put into a graphite crucible and melted at 1,200°C for 1 hour using an externally heated electric furnace. . Then, the graphite crucible was taken out from the externally heated electric furnace and cooled to obtain a metal whose tin grade was adjusted to 4% by mass.

[0042] The same treatment and analysis as in Example-1 were performed except that the metal prepared above with the tin grade adjusted to 4% by mass was used. The results are shown in Table 3.

[0043] Table 3 shows the results of analysis in the same manner as in Example-1, except that the copper metal having a tin grade of 4% by mass prepared above was used.

[0044] [table 3]

[0045]

[0046] As can be seen from the results in Table 3, for the tin removal treatment in Example 3, as long as 2 equivalents or more of sodium hydroxide is added relative ...

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Abstract

PROBLEM TO BE SOLVED: To provide a method for removing tin in crude copper by dry type refining where the content of tin in crude copper can be made into a low level, and further, the content of tin can be controlled to ≤0.33 mass%. SOLUTION: In the dry type refining method, copper, noble metal scrap raw materials including copper, at least one or more kinds of noble metals selected from gold, silver, platinum, rhodium and ruthenium, and tin are melted and reduced together with a solvent and a reducing agent, after separation into the reduced slag and the reduced metal, the melted and reduced metal is subjected to oxidative crude refining for 0.5 to 7 hr with air at a flow rate of 0.5 to 3 L / min / kg-metal, and, in the case the grade of the copper in the crude copper after the oxidative crude refining is <4 mass%, sodium hydroxide is added by an equivalent of 4.5 or above to the tin in the crude copper, and the same is melted and oxidized for 0.5 to 3 hr with an oxygen-containing gas at a flow rate of ≤3 L / min / kg-metal, thus the tin in the crude copper is removed to a grade at which the electrorefining of the copper is possible or below.

Description

technical field [0001] The present invention relates to a method for removing tin from blister copper obtained by dry refining. Background technique [0002] Generally, electrolytic copper in copper smelting is produced through the following steps. First, the copper concentrate is melted in an autothermal smelting furnace or a reverberatory furnace, etc., and then oxidized in a converter, and the obtained blister copper is refined in a refining furnace, and the obtained refined blister copper with a purity of 98-99% by mass is cast into Anode plates for copper electrolytic refining (hereinafter referred to as anodes). [0003] Next, the anode and cathode plates obtained by casting (hereinafter referred to as the cathode) are alternately arranged at a certain interval in the electrolytic cell that has added copper electrolyte, and the current density is 250A / m 2 Under the condition of energizing current of 99.99 mass % or above, copper ions are eluted from the anode as refi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B15/14
CPCY02P10/20
Inventor 佐佐木康胜副浩二
Owner JX NIPPON MINING & METALS CORP
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