DE383210C - Process for melting and refining metals - Google Patents

Description

Process for melting and refining metals. The invention relates to a process for melting and refining metals, and in particular the type of furnace used in such a process. It has been proposed to use pulverized fuel nozzle firing for this method as well (Coal dust firing) to use because of the well-known far-reaching economic. Advantages. In many cases, however, the idea of using pulverized coal firing has been considered because of the fly ash and sulphurous gases entrained in the hearth evoked; this applies in particular to the last part of the furnace work.

The purpose of the invention is to overcome these concerns without opening up To have to do without the advantageous pulverized coal combustion. This is done through a Combined firing achieved, consisting of a pulverized coal furnace and a Type of firing that is free or low in fly ash, such as grate, half gas, gas, oil firing or the like, which are used one after the other. The use of pulverized coal combustion takes place in most cases in the first and much larger part of the furnace work instead of,. while the fly ash-free or low-fly ash firing is mostly proportionate Short duration of the last part of the furnace work (e.g. getting the loading ready) remains limited.

In this way it is achieved that the cheap pulverized coal combustion can also be used in melting and fine processes without an unfavorable one Effect on the metal to be extracted arises. In general, the use the fly ash-free or low-fly ash firing is based on one in relation to the total duration the furnace work only for a short time, e.g. B. only two to three hours, 'with 24 hours Limit batch duration. This furnace can be in the same furnace or in one other oven can be used. .

The invention makes it possible for the same work performance to achieve considerable savings in operating costs in terms of quantity and quality.

The drawing shows the new firing process as an exemplary embodiment a flame furnace illustrates how it is used for the copper refinery.

Fig. I shows a longitudinal section along the line A-B '. of Fig. 2, Fig. z @. a cross-section along the line C-D of Fig. i.

The coal dust air mixture is through the nozzle i in the combustion chamber 2 is blown in and ignited here the slag is removed in the usual way. The flame then sweeps across the bridge 3 on the melting hearth d .. The flue gases are drawn off through channel 5. At the furnace are also z. B. two oil or high-gas burners 6 (Fig. 2) provided after Turn off the dust flame and take over the heating. One becomes about in this case work with the dust firing until after the sealing pole is finished and only with Zähpolen and pouring it out to keep the bath warm with the gas or oil burner.

Since the dust firing is to a large extent made of high-temperature lump fuels is independent, it frees the furnace from the consideration of such as z. B. with simple half gas firing, the entire waste heat for other use and remains available especially for steam generation.

Claims (1)

PATENT CLAIM: Process for melting and refining metals, characterized by the successive use of a pulverized coal furnace and a furnace free or low in fly ash (e.g. grate, half gas, gas, (11-furnace or the like). In the following way, (in the first and larger part of the furnace work, use the pulverized coal flame; in the last part, e.g. to finish off the charge, use the fly ash-free or low-fly ash firing in the same or another furnace.