【摘 要】
：
Colloidal aluminum-chromium residue(ACR) was mass-produced in chromate production process, and the large energy consumption and high recovery cost existed in tr
论文部分内容阅读
Colloidal aluminum-chromium residue(ACR) was mass-produced in chromate production process, and the large energy consumption and high recovery cost existed in traditional methods of utilizing such ACR. To overcome those problems, a new comprehensive method was proposed to deal with the ACR, and was proven valid in industry. In the new process, the chromate was separated firstly from the colloidal ACR by ripening and washing with additives, by which more than 95% hexavalent chromium was recovered. The chromium-free aluminum residue(CFAR), after properly dispersed, was digested at 120-130 ℃ and more than 90% alumina can be recovered. And then the pregnant aluminate solution obtained from digestion was seeded to precipitate aluminum hydroxide. This new method can successfully recover both alumina and sodium chromate, and thus realize the comprehensive utilization of ACR from chromate industry.
其他文献
To solve the highly nonlinear and non-Gaussian recursive state estimation problem in geomagnetic navigation, the unscented particle filter (UPF) was introduced
A 3-D mathematical model was presented for the cooling process of iron ore pellets based on the laws of mass,momentum,and heat transfer.The flow,pressure,and te
In order to achieve large tolerance capture and high stiffness connection for space payload operations, a Chinese large-scale space end-effector (EER) was devel
随着市场经济的逐步建立和我国行政体制改革的深入,政府绩效评估作为行政管理制度创新和有效管理工具越来越受到重视,近年来我国政府绩效评估取得了很大成绩,但当前政府绩效
本文试图通过探析德国富格尔商人家族迅速兴起的历史地理与时代背景,来透视商人家族在资本主义过渡时期的社会地位,供今天迅速崛起的中国家族企业参考借鉴。
This paper tri
埃塞俄比亚法律制度深受欧洲文化的影响,属于受大陆法系法律文化影响较深的国家之一。埃塞俄比亚民法典由法国比较法学家制定,主要是对欧洲法律思想的继受,其财团制度较具特
The purpose of this study is to forecast the profitable oil and gas reservoir, which is the key of finding hydrocarbon, based on the conception of special geolo
The hydrodynamic problem of a two-dimensional model of seafloor mining tool entering still water vertically at constant speed was analyzed based on the velocity
A super-resolution reconstruction approach of radar image using an adaptive-threshold singular value decomposition (SVD) technique was presented, and its perfor
Differential evolution (DE) is an evolutionary optimization method, which has been successfully used in many practical cases. However, DE involves large computa