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从碲化物型金精矿中选择性预浸出碲

Selective Pre-leaching of Tellurium From Telluride-Type Gold Concentrate.

作者信息

Yang Wei, Lan Xuechen, Wang Qian, Dong Ping, Wang Gang

机构信息

School of Resource Engineering, Xi'an University of Architecture and Technology, Xi'an, China.

Key Laboratory of Gold and Resources in Shaanxi Province, Xi'an, China.

出版信息

Front Chem. 2021 Mar 25;9:593888. doi: 10.3389/fchem.2021.593888. eCollection 2021.

DOI:10.3389/fchem.2021.593888
PMID:33842428
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8027068/
Abstract

With a telluride-type gold ore flotation concentrate as the research object, the NaS + NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, leaching temperature, and leaching time on the leaching rate of tellurium were investigated. The results showed that the tellurium leaching rate could reach 78.14% under the optimum conditions of -0.038 mm (95%) grinding fineness, 80 g/L NaS concentration, 30 g/L NaOH concentration, 4:1 liquid-solid ratio, 80°C leaching temperature and 3 h's leaching time. The kinetic analysis showed that the leaching process of tellurium from telluride-type gold concentrate was a mixed type of chemical reaction control and diffusion control. The grain parameter in the leaching process was 0.26263 and the apparent activation energy E = 17.12 kJ/mol. Tellurium could be pre-leached from the telluride-type gold flotation concentrate through the NaS + NaOH alkaline leaching process to achieve the effective separation of tellurium from noble metals, which, when eliminating the adverse effects of telluride on the leaching of gold and silver, provides new ideas for the extraction of rare element tellurium.

摘要

以碲化物型金矿石浮选精矿为研究对象，采用NaS + NaOH协同浸出工艺在金、银氰化浸出之前选择性分离碲。考察了浸出剂种类、浸出剂用量、液固比、浸出温度和浸出时间等工艺参数对碲浸出率的影响。结果表明，在磨矿细度-0.038 mm（95%）、NaS浓度80 g/L、NaOH浓度30 g/L、液固比4:1、浸出温度80℃、浸出时间3 h的最佳条件下，碲浸出率可达78.14%。动力学分析表明，碲化物型金精矿中碲的浸出过程是化学反应控制和扩散控制的混合类型。浸出过程中的颗粒参数为0.26263，表观活化能E = 17.12 kJ/mol。通过NaS + NaOH碱性浸出工艺可从碲化物型金浮选精矿中预浸出碲，实现碲与贵金属的有效分离，在消除碲化物对金、银浸出的不利影响的同时，为稀有元素碲的提取提供了新思路。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/00848c2b076d/fchem-09-593888-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/27b49edf06f3/fchem-09-593888-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/13a9d4dfdee4/fchem-09-593888-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/ed3e5ebcd087/fchem-09-593888-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/6f86b877d168/fchem-09-593888-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/59ee85a9368d/fchem-09-593888-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/dadafb9b5ef9/fchem-09-593888-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/15dcf74cc91d/fchem-09-593888-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/4e88f3a36502/fchem-09-593888-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/f6529bea40a5/fchem-09-593888-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/00848c2b076d/fchem-09-593888-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/27b49edf06f3/fchem-09-593888-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/d102cd64683a/fchem-09-593888-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/1087e06a0e57/fchem-09-593888-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/13a9d4dfdee4/fchem-09-593888-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/ed3e5ebcd087/fchem-09-593888-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/6f86b877d168/fchem-09-593888-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/59ee85a9368d/fchem-09-593888-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/dadafb9b5ef9/fchem-09-593888-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/15dcf74cc91d/fchem-09-593888-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/4e88f3a36502/fchem-09-593888-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/f6529bea40a5/fchem-09-593888-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4684/8027068/00848c2b076d/fchem-09-593888-g012.jpg

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本文引用的文献

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Tellurium as a high-performance elemental thermoelectric.碲作为一种高性能元素热电材料。
Nat Commun. 2016 Jan 11;7:10287. doi: 10.1038/ncomms10287.
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Tellurium: a maverick among the chalcogens.碲：硫族元素中的特立独行者。
Chem Soc Rev. 2015 Apr 7;44(7):1725-39. doi: 10.1039/c4cs00434e. Epub 2015 Feb 18.
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Immunomodulating tellurium compounds as anti-cancer agents.免疫调节碲化合物作为抗癌剂。
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Tellurium in a twist.扭转中的碲。
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