介绍一种适于热轧长钢管生产线使用、锯管时间较短、环境污染小和使用安全的HGJ - 800型钢管锯断机。

HGJ-800 pipe cut-off machine, which is used in a long-pipe hot rolling line, and can short cut-off time and has less pollution and safer working, is described.

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长管升膜蒸发器浓缩全获浆黑液，采用大、小循环间断出浓黑液的方式生产浓度45％左右的浓黑液是可行的。

The concentration of Amur silver grass black liquor to about 45% is made possible in long-tube-rising-film evaporators by employing proper black liquor re-cycling techniques.

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