Hvor guld findes, og hvordan udvindes det

Guld i sin oprindelige tilstand findes i kvartssten, i form af filamenter, pletter og folier, ofte blandet med sølvmineraler.
Eller det kan også findes i flodlejer, blandet med sand, i form af korn og nuggets.
Udvinding af guld
Guldudvinding kan praktiseres med tre forskellige processer: udjævning , sammenlægning og cyanidering . Det er dog ikke altid nødvendigt at bruge alle tre processer.
Udjævningen foregår ved hjælp af lange beholdere, som tillader adskillelse af guldet ved at lade en langsom vandstrøm strømme. Faktisk bliver affaldsmaterialet, der er lettere end guld, slæbt med vandet, mens de små guldstykker synker til bunden af beholderen.
Ved sammenlægning formales råvarer til et pulver, som derefter blandes med kviksølv. Efterfølgende genvindes ædelmetallet ved at destillere amalgamet.
Cyanidering er den vigtigste udvindingsproces. Guldmalm behandles med en opløsning af kaliumcyanid, i nærværelse af luft smelter guldet og bliver til auro-kaliumcyanid. Adskillelsen af guldet fra denne opløsning sker med zink og elektrolytisk.
Egenskaber af guld
Guld i sin oprindelige tilstand er rødlig gul i farven, skinnende, uforanderlig og formbar (den mest formbare af metaller). Af denne sidste grund og for at gøre det muligt at bearbejde det, er det legeret med andre metaller. Ingen almindelig syre påvirker det undtagen aqua regia, klorvand og alkaliske cyanider. Dens smeltepunkt er 1063° og kogepunkt ved 2600°.
De største guldproducenter er Sydafrika, Kina, USA og Australien.
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