The Effect of Underwater Explosion on the Kinetics of Alkaline Leaching of Roasted Tungsten Carbide Scraps for Recycling
The Effect of Underwater Explosion on the Kinetics of Alkaline Leaching of Roasted Tungsten Carbide Scraps for Recycling
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DOI：
10.5188/ijsmer.12.55
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发表时间：
2004-09
期刊：
影响因子：
--
通讯作者：
Seung-Woo Baik;A. Shibayama;K. Murata;T. Fujita
中科院分区：
文献类型：
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作者：
Seung-Woo Baik;A. Shibayama;K. Murata;T. Fujita
废钨废料是重要的回收资源，然而，由于其机械强度，钨的机械回收工艺难以回收。水下爆炸压裂技术就是为解决这一问题而设计的。为评价水下爆炸破碎工艺的效果，对两种破碎工艺制备的不同粒度分布的钨合金焙烧废料进行了碱浸动力学研究。通过对这些浸出趋势的估计，可以了解这种破碎废弃钨合金废料的技术的优点。本文从动力学角度对爆破破碎法碱浸效果进行了评价。用10%NaOH溶液在293- 353 K范围内进行碱浸。焙烧碳化钨废料的氢氧化钠浸出对温度和浸出时间有很强的依赖性，水下爆炸可加快浸出速度。碱浸反应的活化能为60-64 kJ/mol。
Wasted tungsten scraps are important resources for recycling, however, the mechanical recycle process of tungsten has a difficulty for recycling due to its mechanical strength. Underwater explosion fracturing technique was designed for solving this problem. The kinetics for alkaline leaching of roasted tungsten alloy scraps with different size distribution prepared by two ways of crushing technique has been investigated to evaluate the effect of the underwater explosion-crushing. The merit of this technique for fracturing of waste tungsten alloy scraps can be understood by estimating of those leaching tendencies. The present work aims at the evaluation of the explosion-crushing method for efficiency of alkaline leaching from a kinetic point of view. Alkaline leaching was carried out with 10% NaOH solution in the range of 293-353K at various times. The leaching of roasted tungsten carbide scraps by NaOH was strongly dependent on temperature and leaching time, and underwater explosion accelerated the leaching ratio. The leaching mechanism was turned out to reaction controlled, and activation energy of alkaline leaching was 60-64 kJ/mol.