正文 第一卷宋吏难做 第 37章 鲁班传艺(第1页/共3页)
不多时，张母的面就做好了，李大莲端了一碗给他，阎婆惜也分到了一小碗，一家人就在院子里或站或坐稀里哗啦地吃起来。
吃完饭，阎婆惜继续养病，张文远就出门去李二家，昨天给他老婆做了一个手术，他一直在担心她的伤口发炎。不过到了之后就发现他们家没什么异常，李二仍然在做木工活，看到他来就笑容满面地道，“三爷，你来了？”
杜江问道，“嫂子怎么样了，有没有发烧？”
李二喜道，“咳……没有，没有！一宿都好好的，你的本事比那些郎中还高明啊！”
“走，去看看！”
两人来到后院，李大娘子仍然趴在凉床上，见到他就兴奋地叫了起来，“三爷啊，您治好了俺的背疮，您是俺的大恩人啊！”
张文远见她精气神好了许多，知道手术成功了，笑着谦虚了几句，“快趴下，别动，我来给你换药！”
揭开纱布，见创口只是有些红肿，张文远终于放心了，又用酒精冲洗了一遍，换了新的纱布和绷带，交代道，“暂时不要乱动，不要碰冷水，过几天就会好了！”
李二夫妇喜不自胜，又要留他吃饭，张文远哈哈笑道，“我早上吃的还在喉咙眼儿呢，哪里吃得下去！我过来没什么事，就是看一看，既然没事，我就回去了！”
李二千恩万谢，又给他买了两斤猪肉，张文远坚决不要，他就让大儿子狗娃在后面跟着，张文远没办法，只得收了。
回到院子里，张文远把猪肉交给张母，就开始精炼食盐，让李大莲去洗锅烧水，他自己则去调制草木灰溶液。山东自古就是产盐大省，所产的海盐远销整个华北地区，不少人都靠盐业发家致富。但这个时代的制盐技术还比较落后，因为不能分离钾、钙、镁等杂质，制出来的盐又苦又涩，因此山东的海盐与山西的解盐、四川的井盐相比差距不小，他要做的事就是把这些杂质分离出来。
十斤盐全部溶解到水里之后，他就把兑好的草木灰溶液加进去。草木灰里含有碳酸钾，沉淀完之后取上面的清水就成了碳酸钾溶液，正好可以用来析出食盐溶液中的钙离子和镁离子，取上面的部分就能得到钠盐和钾盐的混合溶液。
再把溶液分成甲乙两份，甲少乙多，把两份都煮沸，乙份直接烧干，得到盐块。再把临近沸腾的甲份倒在盐块里不断搅拌，充分溶解后倒掉卤水，反复操作几次以后就能得到纯度在90%以上的精盐了。
这叫“洗盐法”，利用的是氯化钠和其他盐分的溶解度与温度的关系，学过化学的都知道，几乎所有无机盐的溶解度都会随着温度的增加而增加，但氯化钠除却并非如此，它的溶解度和温度几乎没有关系，洗盐法就是利用了这一点。
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