Yaozhong LAN
,
Rose W.Smith
材料科学技术（英）
The gold sulfide concentrate with a high As content in Liangshan District, Sichuan Province, China, is a potentially important resource. This paper describes experiments of dearsenification of gold concentrate in a weakly reduced atmosphere in a rotary pipe furnace. The results showed that the optimal parameters were a temperature range of 650~700℃, 15%~16% CO2 of gas and a reaction time of 30~40 min. The removal rate of arsenic and sulfur was over 95% and 25%~28%, respectively. With further oxidization and roasting, residue sulfur in the roasted materials was dropped to below 4%, and the cyanide leaching recovery of gold was over 92%.
关键词:
Gold sulfide concentrate with a high As content
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Yaozhong LAN
,
Liaoyuan YE
,
Rose W.Smith
材料科学技术（英）
An ever increasing demand for zinc has resulted in worldwide efforts to exploit complex and lean grade reserves of zinc oxide ore. In this study experiments were done on zinc recovery from high-fluorine bearing zinc oxide ore. First the effect of different variables on fluorine removal was investigated. Optimum experimental conditions occurred when the temperature was 1173 K, roasting time was 90 min and air flow was at a velocity of 5 m/min, the fluorine removal from the samples reached over 93%. The results obtained indicate that fluorine removal is not enhanced by adding diluted sulfuric acid or water as a binder. Second the roasted materials were leached with a diluted sulfuric acid, neutralized, flocculated and filtrated. The residual fluorine content in the leached solutions was less than 38 mg/L, which satisfies the requirement of fluorine content in the leached solutions for the production of electrolytic zinc.
关键词:
High-fluorine bearing zinc oxide ore
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刘建平
,
苗永霞
,
周晓湘
材料保护
doi:10.3969/j.issn.1001-1560.2005.08.007
为了减缓酸洗过程中金属制品的严重腐蚀,酸洗缓蚀剂被广泛使用,开发使用方便、低毒、低剂量、环保的酸洗缓蚀剂很有意义.利用失重法、动电位扫描法和电化学交流阻抗法对复配咪唑啉类缓蚀剂LAN的耐蚀性能进行了研究.结果表明:在50 ℃的5%(质量分数)盐酸中加入0.3% (质量分数)的LAN能有效地提高碳钢的耐蚀性能;LAN的缓蚀作用机理系几何覆盖效应,它在金属表面吸附成膜后,使阴极和阳极过程都受到了阻滞.同时,根据EIS谱提出了相应的特征等效电路.
关键词:
缓蚀剂
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咪唑啉类
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缓蚀效率
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极化曲线
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交流阻抗
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等效电路
