论文部分内容阅读
一、前言近十余年来,上海地区金属热处理行业氰盐使用量已大幅度下降,其中的氰化钠年消耗量已从1979年的212吨下降至1990年的34吨,除链条、缝纫机零件外,氰盐已基本革除。即使仍在使用的单位,也加强了监测,其三废经处理达标后排放,这不仅提高了环境文明程度,也有力地推动了可控气氛热处理的应用,使上海市的热处理生产技术水平有较大的提高,成绩是十分显著的。革除氰盐所采取的技术措施是根据各单位不同零件的产、质量要求来进行的。一般
I. Introduction In the recent ten years, the use of cyanide in the metal heat treatment industry in Shanghai has dropped drastically. The annual consumption of sodium cyanide has dropped from 212 tons in 1979 to 34 tons in 1990. Except for the chain, sewing machine Parts, cyanide has been basically eradicated. Even the units that are still in use have also stepped up their monitoring and the emission of the three wastes after they have reached the standard can not only improve the degree of environmental civilization but also greatly promote the application of controlled atmosphere heat treatment and make Shanghai’s heat treatment production technology more competitive Great improvement, the results are very significant. Cyanide removed by the technical measures taken is based on the various parts of the production and quality requirements to carry out. general