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A green method for decomposition of scheelite under normal atmospheric pressure by sodium phytate
Hydrometallurgy ( IF 4.8 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.hydromet.2019.105234
Xinrui Zhu , Xuheng Liu , Zhongwei Zhao , Xingyu Chen , Jiangtao Li , Lihua He

Abstract As a critical metal, tungsten is in widespread use and high demand. Most traditional tungsten smelting processes use a NaOH decomposition method. However, there are deficiencies with the traditional method, such as the high cost of leaching agents and environmental pollution. In this paper, sodium phytate, a phosphate-rich ester salt, was evaluated for the first time as a green leaching agent for the extraction of tungsten from scheelite. In the leaching process, sodium phytate was used to precipitate Ca2+ while transferring WO42− from the mineral to the water phase. The results of FTIR showed that the solid product in the leaching residue of scheelite was calcium phytate. The highest tungsten leaching extents of 96.89% and 97.12% were achieved with 1.5 times of the theoretical amount of sodium phytate, 150 g/L NaOH, and an L/S ratio of 10:1 at 363 K for 10 h. Sodium phytate is regenerated by leaching tungsten slag with H2SO4, and the solid product, CaSO4, can be repurposed as a building material to avoid environmental pollution caused by leaching residue. In this sodium phytate leaching system, impurities such as silicon, molybdenum, and phosphorus in scheelite were leached to different degrees, and then entered the leaching liquid. This innovative process features leaching tungsten under mild conditions using reusable sodium phytate. These advantages contribute toward the sustainable characteristics of this process, which can be considered as a sustainable and efficient agent to scheelite leaching.

中文翻译:

植酸钠常压分解白钨的绿色方法

摘要 钨作为一种重要的金属,用途广泛,需求量大。大多数传统的钨冶炼工艺使用 NaOH 分解方法。但传统方法存在浸出剂成本高、环境污染等不足。在本文中,植酸钠,一种富含磷酸盐的酯盐,首次被评估为一种从白钨矿中提取钨的绿色浸出剂。在浸出过程中,使用植酸钠沉淀 Ca2+,同时将 WO42- 从矿物转移到水相。FTIR结果表明白钨矿浸出渣中的固体产物为植酸钙。在植酸钠理论用量的 1.5 倍、150 g/L NaOH 条件下,钨浸出率最高,分别为 96.89% 和 97.12%。L/S 比为 10:1,在 363 K 下持续 10 小时。植酸钠通过用H2SO4浸出钨渣再生,固体产物CaSO4可重新用作建筑材料,避免浸出渣对环境造成污染。在该植酸钠浸出系统中,白钨中的硅、钼、磷等杂质被不同程度地浸出,然后进入浸出液。这种创新工艺的特点是使用可重复使用的植酸钠在温和条件下浸出钨。这些优点有助于该工艺的可持续特性,可将其视为白钨矿浸出的可持续且有效的代理。可重新用作建筑材料,避免浸出渣对环境造成污染。在该植酸钠浸出系统中,白钨中的硅、钼、磷等杂质被不同程度地浸出,然后进入浸出液。这种创新工艺的特点是使用可重复使用的植酸钠在温和条件下浸出钨。这些优点有助于该工艺的可持续特性,可将其视为白钨矿浸出的可持续且有效的代理。可重新用作建筑材料,避免浸出渣对环境造成污染。在该植酸钠浸出系统中,白钨中的硅、钼、磷等杂质被不同程度地浸出,然后进入浸出液。这种创新工艺的特点是使用可重复使用的植酸钠在温和条件下浸出钨。这些优点有助于该工艺的可持续特性,可将其视为白钨矿浸出的可持续且有效的代理。这种创新工艺的特点是使用可重复使用的植酸钠在温和条件下浸出钨。这些优点有助于该工艺的可持续特性,可将其视为白钨矿浸出的可持续且有效的代理。这种创新工艺的特点是使用可重复使用的植酸钠在温和条件下浸出钨。这些优点有助于该工艺的可持续特性,可将其视为白钨矿浸出的可持续且有效的代理。
更新日期:2020-01-01
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