石灰净化水的价值
柠檬水处理是有价值的比例的比例的水溶性钙氧化物,但它的值是减少不成比例的惰性材料自然stone-magnesia,氧化铝,二氧化硅,未燃尽的石头,尽管这些材料可以用于其他目的几乎无害的如果不积极有益的,许多铁路和商业软化厂以及一些较小的城市都使用了水合石灰，但其成本相对较高，难以大量输送，处理过程中释放出大量粉尘，这些都限制了它的应用。大多数较大的植物都使用生石灰。本讨论涉及购买后一种材料的规格变化无常。一个完全基于交付中石灰的百分比的合同对买方是不公平的，因为他按合同价格支付氧化钙，无论含有多少石头和其他杂质。卖主出售他碰巧拥有的任何东西;买方得到的是他必须得到的东西，而无需支付卸货、粉碎、搬运和使用相当比例的惰性材料的费用，这些惰性材料堵塞了熟化罐，搅拌时浪费了动力，需要更频繁地清洗熟化罐。从下面的插图可以明显看出，这笔费用并非微不足道。在清洗之间25它的吨石灰平均90%，去年在圣路易斯有时被处理，其中一半的石灰是惰性物质低的，而在一年的其余时间里平均为171至175吨RM %的石灰。来自105吨石灰的堆芯碎片和垃圾导致了一台10马力马达的故障。 The cost of cleaning a tank and starting a new one is approximately five cents per ion greater with an 83 per cent, lime than with a 90 per cent., not counting the waste of power in stirring. It is obvious that some system of penalising for impurities should be etiforced. The impossibility of procuring a commercial, lime containing 100 per cent, water soluble calcium oxide, influences most purchasers to write specifications upon the basis of a lower guaranteed content. In some cases this has resulted in confusion in adjustment of purchase price or better and poorer limes, with purely nominal and misleading bonus and penalty clauses. If the vendor is to receive full payment for pure lime delivered, with neither bonus nor penalty, the incremen* is of course found by the general formula 100 guaranteedper cent, equals per cent, of contract price to be added or subtracted for each I per cent, variation from the guarantee.
在底特律举行的美国中部水利协会会议上阅读
