| 摘要 |
<p>Plant for exploiting metallurgical slags not contg. phosphorus, uses a furnace (a) with a vertical axis and height pref. equal to its dia. The slag is heated in the furnace (a) e.g. by >=1 burner with its bottom end dipping into the slag, and the furnace has a spout and is tilted for emptying. Devices are included for adding agents which reduce iron- and manganese-oxides, and for adding lime. Furnace (a) is emptied into a rotary drum furnace (b) with an axis which is almost horizontal, but sloping towards its outlet, in furnace (b), the lime reacts with the reduced slag so Portland cement clinker is formed in furnace (b). Furnace (a) pref. has a taphole for removing Fe and Mn obtd. by the redn. of their oxides. See also 867391. Slags which had only a few industrial or agricultural uses in the past can now be used as Portland cement.</p> |
