第四十六章 炼铁高炉

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    第四十六章炼铁高炉(第1/2页)
    第四卷·王者归位
    第四十六章炼铁高炉
    靖海侯的封号传回南坡的时候,并没有在台地上引起太大的波澜。
    消息是随着南风号回航一同带回来的,苏眉在船靠岸后把一封誊抄好的诏书副本递到了陈账房手中,陈账房展开来逐字念了一遍。旁边围了十几个人听,听完之后有人互相看了一眼,有人低头继续整理手边的工具,有人站在原地多待了片刻才各自散去。当天晚上火堆边的日常对话中多了一些零散的、关于京城和那趟远行的只言片语,但没有人在火堆边聚集议论太久,大家的关注点很快又回落到了手边正在做的事情:有人蹲在田埂边沿掐下一片发黄的芋头叶放到一边,有人把一块新晒好的干鱼翻了个面让它受风更均匀,有人推着独轮车运送新砍回的柴火穿过台地中央,车轮碾过碎石路面的声响持续了一段距离后逐渐被落日的余晖和逐渐转凉的气温吞没。身份的改变没有改变台地上原有的生活节奏,只是让一些原本需要额外解释和交涉的程序变得简便了。
    获得正式封号后的第三天,林锋蹲在旗杆底座旁边的石板面前重新展开了一张他许久前画过的技术路线图。这张图上标注着从最初的基本生存技术到后续各技术节点的扩展路径,每个分支都有对应的材料需求和加工设备要求。其中一条主线在火药和铁器加工交汇处之后持续向上延伸,经过铁皮锻打和基础熔炼的粗加工阶段,终于延伸到了一个一直被标记为“下一阶段“但始终没有正式启动的分支节点——高炉炼铁。
    他在那个节点上用新的炭笔重新描了一遍,线条比当初画上去时更粗、更深。
    高炉炼铁和南坡目前使用的简易熔炼方法之间存在质的差异。现有的熔炼方式是在敞口炉膛中一次性投入少量铁砂和木炭,用鼓风加热后一次性得到少量铁块。这种方式的产量低,温度有限,铁砂中的杂质无法完全去除,出来的铁块脆性大,不能用作大型结构件的材料。高炉则是连续运行的,燃料和矿石从顶部逐层加入,热空气从底部持续鼓入,矿石在下降过程中逐步完成还原反应,液态铁水从炉底的出铁口定期排出,铁水在炉内流动的过程中会经历熔化和分离的过程,石灰石作为熔剂加入后可以吸附矿石中的硅、磷等杂质形成矿渣并从另一侧排出,留下的铁水纯度远高于敞口炉炼出的铁块。一次性建成并投入运行后可以持续运行很长时间而不间断产出,产量可达每日数百斤甚至更高。
    但建一座高炉需要的条件也远比敞口炉复杂。
    首先需要选址。高炉的炉体全部用石料砌筑,自重很大,基础必须建在坚硬的岩面上,不能是松软的土壤或沙地。其次需要大量的耐火材料,炉膛内壁需要承受高温铁水和炉渣的持续冲刷和腐蚀,需要用石英含量高的砂岩或专门烧制的耐火砖来做内衬层,不能简单地用普通石材替代。还需要稳定的燃料和矿石供应——高炉一旦点火就不能随意停炉,连续运行期间需要持续不断地往炉顶加料,铁砂、木炭和石灰石的消耗量都会达到一个数量级,远超南坡目前任何一项资源消耗型设施。最后还需要足够的人力来维持运转——加料、鼓风、出铁、排渣、维护炉体,这些岗位都需要有专人负责,也需要有经验的工匠来掌握火候和炉况的平衡。
    马平在听到林锋描述高炉的尺寸和运行模式之后蹲在地上沉默了一整个下午,那天傍晚他拎着炭笔在石板面上画了一座高炉的草图,草图边沿从进料口到出铁口的流线标注了一系列短句,包括进料频率、鼓风压强的范围、铁水温度的预估下限和石灰石与铁砂的配比区间。他画完之后又在图的下方补了一行小字:“需要找一处有稳定水源的位置,炉体冷却和矿渣处理都需要持续用水。“
    炉址选址用了三天时间。马平带着两个帮手沿着台地北面的坡道一路向上走到一处以前未曾详细勘察过的地段,注意到地形有抬升和倾斜。他们沿着该地段向南走了一段,发现土质在这一带从沙壤逐步过渡为岩石层。其中有几块裸露的岩面朝外微微倾斜,在午后的阳光照射下表面泛着干燥的浅灰色光泽,质地密实坚硬,用铁锤敲击时发出的声音短促清脆,敲击后的回响在空气中持续了一段时间才逐渐收束。马平蹲在其中一块较大的岩面上用铁钎在边角位置凿了几下,铁钎进入岩面的深度很小,每一下都只削下一层极薄的石粉,说明岩层的整体性和致密程度很高,是支撑大型重载结构所需的可靠基础面。他站起来朝周围看了一圈,发现这个位置距离溪谷支流只有一段不远的距离,引水管道可以从溪谷方向沿自然坡降铺设过来,不需要额外提水和架设高位的导流槽。坡面上方的林地距离也不远,木炭的运输路线可以直接从林地边缘沿一条较为平缓的路径接入炉址区域,坡度不会造成运送负担。
    选好炉址后,耐火材料的准备与加工随即展开。南
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