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镁合金铸造旧工艺中规定的型砂掺有8％左右的氟化物,在浇注和打箱过程中分解出大量的氟化氯等有毒气体,严重地损害工人的身体健康,腐蚀厂房与设备,污染环境。随着革命生产形势发展,广大工人强烈要求改革旧工艺,搬掉氟老虎,走无毒化铸造生产的道路。为此,我们厂校结合,三年多来进行了上百次的反复试验,对十多种药品、数十种配方进行了对比验证,选定了硫代硫酸铵型砂配方代替氟化物型砂配方。经生产使用效果较好。一、型砂配方与配制要点
Magnesium alloy casting process in the provisions of the sand mixed with about 8% of fluoride, in the pouring and boxing process decomposition of toxic chlorine gas and other toxic gases, seriously damaging the health of workers, corrosion of plant and equipment, pollution surroundings. With the development of the revolutionary production situation, the majority of workers strongly urge the reform of old technology, remove the fluorine tiger, take the non-toxic casting production road. To this end, our factory together, more than three years carried out hundreds of repeated tests, more than 10 kinds of drugs, dozens of formulations were compared to verify the selected ammonium thiosulfate sand formula instead of fluoride sand formula . The production of better results. First, sand formula and preparation points