金回收: 使用TULSION? 杜笙離子交換樹(shù)脂從氰化物溶液中回收金.
Gold Recovery : From cyanide liquor USING TULSION? ION EXCHANGE RESIN.
簡(jiǎn)介/ INTRODUCTION :
傳統(tǒng)上使用活性碳吸附金子。珍貴的金會(huì)被活性碳吸附于表面,再藉由洗滌或直接焚燒以回收金。
Conventionally activated carbon is used for extracting the gold from the mother liquor commonly contacted with beds of activated-carbon. The precious noble metal loaded on the activated carbon is recovered by elution or simply by incineration of the carrier at high temperature.
使用離子交換樹(shù)脂回收貴金屬比活性碳還具有多方面的優(yōu)勢(shì), 因?yàn)榻逵商厥庵圃爝^(guò)程中, 我們可以在其結(jié)構(gòu)上的有效官能基上置入具有選擇性的離子,以選擇性的吸附此貴重金屬。
Ion exchange resins are more versatile substrates than activated carbons can be used, because specific functional groups can be afixed on the resin matrix, for better selectivity, during the synthesis. These resin can be tailor-made to improve the gold carrier features such as selectivity, resistance to poisoning by calcium or organic materials and loading capacity.
因此, 由于具有經(jīng)濟(jì)考慮優(yōu)勢(shì), 離子交換樹(shù)脂普遍被使用于貴金屬回收。而大部份使用陰離子交換樹(shù)脂來(lái)交換吸附貴金屬。
Therefore the ion exchange resins are economically adopted for the gold recovery. Mostly Anionic type of ion exchange resin are used that adsorb the gold.
用氰化物萃取金的過(guò)程中, 金會(huì)以陰離子的氰化金型式存在, 既Au(CN)2- ; 再經(jīng)由強(qiáng)堿或弱堿的陰離子交換樹(shù)脂交換回收。如Tulsion?A-23(強(qiáng)堿),Tulsion?A-27mp(強(qiáng)堿)及Tulsion?A-2X mp (弱堿) 。
The gold extracted by cyanidation is in the form of anionic aurocyanide complex Au(CN)2 - and can be recovered from the pregnant solution by ionic exchange with strong or weak base anion exchange resin ,such as Tulsion?A-23,Tulsion? A-27MP and Tulsion?A-2XMP
(a) 強(qiáng)堿離子交換樹(shù)脂方面的應(yīng)用:
此型的強(qiáng)堿型陰離子樹(shù)脂具有四級(jí)銨的官能基,在高pH 值的溶液中,藉由交換氯離子的相反離子來(lái)吸附Au(CN)2
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