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在党的十大精神鼓舞下,在批林整风运动的推动下,在上级党委和市工代会科技组的领导下,杭州铸造厂广大革命职工在工业学大庆的群众运动中,积极推广应用优选法,通过优选试验,在冲天炉熔炼中节约用焦方面,取得了成果。该厂冲天炉是在上海新建机器厂的2.5～3吨/时冲天炉的基础上作适当修改而建成的。每天开炉,日产量在12吨左右,总焦比为1∶11～12,铁水温度为1390～1420℃左右。经过优选以后,总焦比提高到1∶14.5～15,铁水温度为1390～1410℃,但有时在熔化后期铁水有氧化现象。为了巩固优选成果,提高铁水质量,进一步降低焦耗,杭州铸造厂铸铁车间
Inspired by the ten major spirits of the party and under the impetus of the campaign of rectifying forests and rectifying the wind, the revolutionary workers and staff of Hangzhou foundry actively promoted and applied them in the mass movement of Daqing in industrial science under the leadership of the higher party committees and the municipal workers’ congressional scientific and technological group. The preferred method, through the preferred experiment, saves the coke in the cupola furnace and achieves the result. The cupola factory is built on the basis of 2.5 ~ 3 ton / hour Cupola in Shanghai New Machinery Factory. Open the stove every day, the daily output of about 12 tons, the total coke ratio of 1:11 ~ 12, hot metal temperature of 1390 ~ 1420 ℃ or so. After optimization, the total coke ratio increased to 1:14.5 ~ 15, the hot metal temperature is 1390 ~ 1410 ℃, but sometimes in the molten iron oxidation phenomenon. In order to consolidate the preferred results, improve the quality of hot metal, to further reduce the coke consumption, Hangzhou Foundry Cast Iron Workshop