Li Qihou

LCA case study for lead and zinc production by an imperial smelting process in china a brief presentation

An LCA case study was conducted for the production of lead and zinc by an Imperial Smelting Process (abbreviated hereafter as ISP) in Shaoguan Smelter, China. The detailed inventory analysis was performed by allocating the Input/Output among the main products.The environmental impacts were assessed by using the following five Eco-indicators: Gross Energy Requirement (GER), Global Warming Potential (GWP), Acidification Potential (AP), Heavy Metal Toxicity (HMT) and Solid Waste Burden (SWB). This study is useful to address the environmental situation of the ISP practiced in this smelter, and provides a scientific basis for further improvement.

The Effect of Sintering on the Properties of Ultrafine Rhenium Powders Prepared by CVD Method

A novel CVD method of preparing ultrafine rhenium powders was investigated in this paper. The Re2O7 gas obtained by decomposing NH4ReO7 was transported to the reduction chamber and then reduced by H2 to form rhenium powders. In order to evaluate the effects of sintering on properties of rhenium particles, such as crystal size, morphology, surface conditions and particle size, the samples of rhenium powders prepared at different reduction temperatures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle size analyzer. The experimental results show that the sintering effect among particles is enhanced with increasing of reduction temperature, resulting in larger crystal size, smoother surface and larger average particle size of the rhenium powder.