DE626375C - Process for removing arsenic and antimony from complex copper-sulfur compounds with a high sulfur content, such as pale ores or edible copper stones - Google Patents

Description

The subject of the invention is a method for removing arsenic and antimony from high-sulfur complex copper-sulfur compounds through volatilization of these metals as trioxides. The release of arsenic and antimony takes place in such a way that iron oxides, which the feed be added, through carbonaceous reducing agents in the course of melting can be reduced to metallic iron. This metallic iron, which is in a special is in reactive states, the sulphides of arsenic and antimony are now withdrawn, exposing the Metals that are then produced by excess atmospheric oxygen or by contact with oxidic Parts of the charge are volatilized as metal oxide dust. As a result of melting, which is most expediently carried out in a shaft furnace, arises in contrast to a method known from British patent specification 15 222 from 1902 without an accumulation from food or metallic copper, a copper stone with a high iron content of a similar composition, as it occurs when fusing copper pebbles, that of the usual Blown can easily be processed on pure copper.

The advantages of the new process are to be cited

1. the almost complete separation of arsenic and extensive separation of Antimony and the possibility of extracting both metals in the form of oxidic dusts a one-time melting,

2. The achievement of a copper stone, which by extensive binding of the original Sulfur content of iron in the melting material, i.e. through deliberately induced sulfur-iron build-up, the heat balance for the subsequent Bessemer process significantly improves,

3. the simplification and cheaper the further extraction of precious metals from the Electrolysis sludge or sludge from other leaching processes arising later because of the higher concentration and the greater purity of these precious metal sludges.

The following is a practical example of the method according to the invention over a four-week trial melting. Concentrates were processed

from the flotation of pale ores, which have the following composition:

Cu '. 31 ^{0 line} ₀

Sb .: 12%

As 7%

Fe 4%

Ag 0.3%

Pb, Zn in addition to traces of Hg

etc 5.5%

26th

Ca O, Mg, Ba 6.5%

SiO, 3%

Rest Co., etc. 4.7%

The gangue of these ores would correspond to a hard-to-melt subsilicate slag and their quantities are not sufficient for an orderly melting operation. Man the charge is therefore calculated according to the general guidelines of the metalworking industry, On the one hand, the most complete possible reprocessing of the later accumulating total amount of converter slag and the rich slag of the own company guaranteed, on the other hand in accordance with the local coke prices and the prices for other necessary melting surcharges a low-cost, easy-flowing and iron oxide possible results in fully saturated slag. In addition there is the further iron surcharge of the Driving out the existing antimony and arsenic is necessary and in the form of higher levels Iron oxides, e.g. B. gravel burns or hammer blows added to the charge will.

The flotation ores are either burned off together with the calculated quantities or hammer blow, including the necessary amount of coal and coke breeze, Briquetted as a reducing agent or loose with the rest of the Schachtoferibeschikkung given up. In the latter case, a corresponding surcharge of coarse Smelting coke bring about the reduction of iron oxide by carbon oxide.

The result of the melting is a copper stone, which in terms of its composition hardly differs from the stones melted from antimony and arsenic-free copper pebbles and no difficulties whatsoever in its further processing in the converter on silver-containing anodes causes more. In the subsequent work-up of the anodes in the electrolysis noble metal slurries are expected to have a silver content of 8 to I2 ° / _o or higher.

The Möller used in the above-mentioned experimental melts had the following Composition:

1. Flotation ore concentrates ... 100 parts

2. Sludge coal (inferior waste coal from the last sewage sumps or coal washing) as a reducing agent for the ore

briquette 6-8 parts

3. Gravel burns 20-25 parts

4. Buntsandstein (acid aggregate with about 90% SiO ₂ ) .... 8 parts

5. Converter slag from blowing the molten Palezkupfersteines 20 parts

6. Back slag from own plant 10 parts

The composition of the molten copper matte was as follows

Cu 36-42%

Sb 1.8-2.5%

As 0.2 o / o

Fe, 19-25%

Ag 0.35-0.38%

The composition of the shaft furnace slag:

SiOo 35-40%

Fe 18-22 per _cent

Sb .: 1.5-2%

As traces

The rest mainly earth bases.

The total retention of arsenic and antimony in copper matte is only around 10% of the Amounts contained in the abandoned ore.

Claims (1)

Claim: Process for removing arsenic and antimony from high sulfur complexes Copper-sulfur compounds, such as pale ores or edible copper stones, characterized in that the starting materials with iron oxides, such as gravel burns or hammer blows, and with a carbon-containing one Reducing agents are subjected to melting under such conditions that the reduction of the Iron oxides formed iron without causing the no deposition of metallic copper comes, goes completely into the forming stone, with arsenic and antimony as Oxides are volatilized.