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CONDITIONS OF USE OF A LEAD-BEARING DEOXIDIZING AGENT

机译:含铅脱氧剂的使用条件

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Lead has a melting point of 327.5 deg C and a boiling point of 1751 deg C. It vaporizes rapidly at relatively low temperatures. The vapor pressure of lead is 5 mm Hg at 1100 deg C and 244 mm Hg at 1550 deg C. Lead is oxidized to PbO when heated in air; and it can be oxidized to PbO_2 when it vaporizes at the temperature of liquid steel. Most compounds of lead are toxic. The greatest danger is posed by lead dust and lead vapor [1, 2]. Lead is rated as a class T hazard, so its concentration in the air at work stations is strictly regulated [3]. The maximum permissible concentrations (according to USSR and Russian Federation standards) are as follows: 0.01 mg/m~3 in the air at work stations; 0.003 mg/m~3 in the atmosphere; 0.03 mg/liter in water; 20 mg/kg in soil [1].
机译:铅的熔点为327.5摄氏度,沸点为1751摄氏度。它在相对较低的温度下迅速蒸发。铅的蒸气压在1100摄氏度为5毫米汞柱,在1550摄氏度为244毫米汞柱。在空气中加热时,铅被氧化为PbO。在液态钢的温度下蒸发时,可被氧化成PbO_2。大多数铅化合物是有毒的。铅粉尘和铅蒸气会带来最大的危险[1、2]。铅被定为T类危害,因此严格限制其在工作场所空气中的浓度[3]。最高允许浓度(根据苏联和俄罗斯联邦标准)如下:工作场所空气中0.01 mg / m〜3;大气中0.003 mg / m〜3;水中0.03 mg /升;在土壤中20 mg / kg [1]。

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