DE350649C - Process for dezincing zinc-containing materials - Google Patents

Description

Zinc-containing ores are undesirable in the Möller in blast furnace operations. You give easily Giving rise to operational disruptions, also requires the reduction and evaporation of the Zinks a considerable effort, which is very noticeable given the prevailing lack of fuel of fuel. Ultimately, it is the zinc dust that causes build-up in the gas pipes and considerable JR cleaning costs in gas scrubbing.

There are already methods of dezincing zinc-containing materials at the same time Extraction of zinc oxide and one already well pre-reduced for blast furnace operation high-quality iron agglomerates by heating the first desulfurized if necessary Materials and a reducing agent proposed. Here the desulphurized Gravel burns with solid carbon

ao or another reducing agent mixed and melted. But the dezincification was here not satisfactory.

According to the present invention, zinc-containing materials are now prepared in the way for the blast furnace operation, that the materials, if necessary, first desulfurized and then subsequently thereto to 1100 ° C with a reducing gas, ζ at about 1000 ^0th Β. Blast furnace gas, treated in a closed furnace or container, where the zinc is reduced, vaporized and recovered.

The surprising thing about this method is that it is easy to use Carbon succeeds in reducing the zinc from zinc-containing materials.

According to the prevailing views, a reduction in zinc was made from zinc-containing Material only possible if there are substantial amounts of solid carbon in the delivery were present.

For example, the procedure was carried out as follows:

In a closed muffle furnace with gas geheiz'ten Kiesabbrände be desulfurized by a first air stream and then subsequently treated thereto at about 1000 ^{0-1100 0} blast furnace gas.

Tests carried out produced the following result:

total Fe Fe O S Zn Analysis of the gravel burns .... 41.12 0.00 7.33 9.23 Analysis of the agglomerate .... 48.00 34.24 0.13 0.17 55 '

The blast furnace gas used had the following composition:

CO _2. = 6.2

O = 0.0,

CO = 31.70

H = 1.89

CH ₄ = 0.50

With the present process, zinc-containing blast furnace ores can therefore be 6g Free from the sulfur and zinc content in a fanatic and cheap way.

Claims (1)

Patent claim: Process for dezincing zinc-containing materials, in particular Gravel burning with simultaneous win The use of zinc pxvd ^ and one for blast furnace operation see well pre-reduced high quality dough ^ nagglomerates, through If necessary, the desulphurised materials and a Redu are heated decorative means, characterized in that the materials in a closed Oven or container at iooo ° to iioo ° C with a reducing gas, e.g. B. blast furnace gas are treated.