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Roestabbraende

English translation: roasting residues

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12:36 Aug 28, 2001
German to English translations [PRO]
Science
German term or phrase: Roestabbraende
Nassbehandlung verschiedener Erze und pyritischer Produkte, z.B. die Röstabbrände von pyritischen schwefel- und chlorhaltigen Erzen stammenden Laugen

actually, if someone could explain the above to me, that would help a lot!
lkoch99
Local time: 18:50
English translation:roasting residues
Explanation:
www.etymos.de/sprachen/englisch/deu-eng/a.htm -
here is an explanation of the process that might shed some light on te text you are dealing with:
http://www.worldbank.org/html/fpd/mining
/m3_files/ienim/andrpro.htm.

A principal challenge facing metallurgists today is the economic treatment of refractory ores where the gold is bound together with
sulphide or pyrite. Before cyanide leach can be used on such ores they must be oxidized. Three techniques are presently available or in an advanced experimental stage: pressure oxidation, whole ore
roasting and bio-leach.

The first process, pressure oxidation, involves placing sulphide ores in solution into an autoclave or closed vessel, injecting oxygen and maintaining the vessel at high temperature. The gold molecules are liberated as the sulphide matrix breaks down and then leached
with cyanide in the conventional manner. A problem involved with this technique as far as developing countries are concerned is that vast quantities of oxygen are required. Many gold deposits in developing countries are too far away from existing oxygen production facilities or are too small to justify installing such facilities. The cost of importing bottled oxygen in the quantities required is prohibitive.

Another method of treating sulphide ore is whole ore roasting. This process uses fluidized bed furnaces to heat the pulverized ore to iberate the gold from the sulphide matrix. Depending on the ore type, it is often possible to achieve autogenous oxidation, that is the sulphur or carbon in the ore itself is used as the energy source,dramatically reducing the amount of energy required.

New developments in bio-leaching technology hold promise for
mineral processing in the developing countries, but those are only
now being proven commercially on a large scale. Naturally occurring bacteria, when injected into tanks containing pulverized ore, 'eat' the sulphide material and this liberate the desired
minerals. The resulting concentrates are then processed in the normal way. The great advantage of bio-leach is that it can eliminate the need to 'roast' ores thereby avoiding the problem of
sulphur dioxide emissions. However, bio-leach still must overcome significant disadvantages. The 'bugs' are very temperamental.
The process also takes considerable time and thus requires substantial investment in facilities in order to achieve desired throughput. Nonetheless, considerable research is being conducted on the process and over the course of the next few years more production scale facilities may be built.
Selected response from:

Johanna Timm, PhD
Canada
Local time: 15:50
Grading comment
Thanks to everyone - I decided to paraphrase using the roasting definition and the scale losses idea.
4 KudoZ points were awarded for this answer

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Summary of answers provided
naroasting residues
Johanna Timm, PhD
nalink (to read about abbrand)Klaus Dorn
naExplanationKlaus Dorn
nascale lossesmichnick


  

Answers


13 mins
scale losses


Explanation:
Electronic Multilingual Dictionary of Science and Technology

A suggestion only
HTH



michnick
Local time: 02:50
Native speaker of: Native in RussianRussian
PRO pts in pair: 24
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19 mins
Explanation


Explanation:
Bedeutung:
Rückstand beim Rösten; Metallverlust durch Verbrennung;

Acids originating from pyric ore, which contains sulfur and chlorite. Looks to me as if they are cleaning these remain acids off?

Klaus Dorn
Local time: 02:50
Native speaker of: Native in EnglishEnglish, Native in GermanGerman
PRO pts in pair: 1514
Login to enter a peer comment (or grade)

20 mins
link (to read about abbrand)


Explanation:
Try this link, it's pretty informative:

http://www.wissen.de/servlets/de.wissen.outerlinks.SearchSer...


    Reference: http://www.wissen.de/servlets/de.wissen.outerlinks.SearchSer...
Klaus Dorn
Local time: 02:50
Native speaker of: Native in EnglishEnglish, Native in GermanGerman
PRO pts in pair: 1514
Login to enter a peer comment (or grade)

1 hr
roasting residues


Explanation:
www.etymos.de/sprachen/englisch/deu-eng/a.htm -
here is an explanation of the process that might shed some light on te text you are dealing with:
http://www.worldbank.org/html/fpd/mining
/m3_files/ienim/andrpro.htm.

A principal challenge facing metallurgists today is the economic treatment of refractory ores where the gold is bound together with
sulphide or pyrite. Before cyanide leach can be used on such ores they must be oxidized. Three techniques are presently available or in an advanced experimental stage: pressure oxidation, whole ore
roasting and bio-leach.

The first process, pressure oxidation, involves placing sulphide ores in solution into an autoclave or closed vessel, injecting oxygen and maintaining the vessel at high temperature. The gold molecules are liberated as the sulphide matrix breaks down and then leached
with cyanide in the conventional manner. A problem involved with this technique as far as developing countries are concerned is that vast quantities of oxygen are required. Many gold deposits in developing countries are too far away from existing oxygen production facilities or are too small to justify installing such facilities. The cost of importing bottled oxygen in the quantities required is prohibitive.

Another method of treating sulphide ore is whole ore roasting. This process uses fluidized bed furnaces to heat the pulverized ore to iberate the gold from the sulphide matrix. Depending on the ore type, it is often possible to achieve autogenous oxidation, that is the sulphur or carbon in the ore itself is used as the energy source,dramatically reducing the amount of energy required.

New developments in bio-leaching technology hold promise for
mineral processing in the developing countries, but those are only
now being proven commercially on a large scale. Naturally occurring bacteria, when injected into tanks containing pulverized ore, 'eat' the sulphide material and this liberate the desired
minerals. The resulting concentrates are then processed in the normal way. The great advantage of bio-leach is that it can eliminate the need to 'roast' ores thereby avoiding the problem of
sulphur dioxide emissions. However, bio-leach still must overcome significant disadvantages. The 'bugs' are very temperamental.
The process also takes considerable time and thus requires substantial investment in facilities in order to achieve desired throughput. Nonetheless, considerable research is being conducted on the process and over the course of the next few years more production scale facilities may be built.


    given
Johanna Timm, PhD
Canada
Local time: 15:50
Native speaker of: Native in GermanGerman
PRO pts in pair: 7302
Grading comment
Thanks to everyone - I decided to paraphrase using the roasting definition and the scale losses idea.
Login to enter a peer comment (or grade)




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