The existing pyrometallurgical process to prepare metal niobium is complex, expensive, energy intensive and probably polluting.
现有的金属铌和铌基合金制备工艺复杂、成本高、能耗大、污染环境。
Tannery belongs to typical industrial branches which during the technological process produce considerable quantities of liquid and solid wastes contributing to polluting the environment.
制革属于典型的工业分支，制革工业中会产生大量的污染环境的废液和废固。
This process can make use of tailings as resource without polluting the environment, realizing the aim of non-tailing mine.
该工艺实现尾矿资源化的同时不会对环境造成污染，可以达到无尾矿矿山的目标。
Used in the masking operation during wave solder process on PCB, prevented electroplating liquid immersing and polluting.
适用于PC b板含浸过程中遮蔽金手指部分和防止电镀液浸入及污染。
To counter the defects of generating yellow fume and polluting environment, the authors introduce a new yellow fume free lustering immersing process for copper and its alloy.
针对以往工艺产生黄烟，污染环境的缺点。作者介绍了一种铜及其合金无黄烟光泽浸蚀新工艺。
This paper deals with the FON process, which is a new non-polluting and high-anticorrosive bath nitrocarburizing complex process.
本文叙述的FON工艺是一种无污染高耐蚀氮碳共渗复合盐浴新工艺。
In the process of heat resolving and coke shaping, different pollutant and polluting factors will be produced and loss to the environment due to different coking way.
综述了目前国内不同炼焦方式在炼焦过程中主要污染物的产生原因、种类、排放方式、常规数量以及控制途径。
The production process avoids the technique of viscose process which is lengthy, complex and seriously polluting.
生产过程中避免了粘胶法冗长复杂且污染严重的工艺。
The production process avoids the technique of viscose process which is lengthy, complex and seriously polluting.
生产过程中避免了粘胶法冗长复杂且污染严重的工艺。
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