SU146900A1 - Pyrometallurgical method of processing of chlorine-free zinc ash - Google Patents

Description

Pyrometallurgical methods of processing of de-chlorinated zinc ash by reducing it in a mixture with a solid reducing agent on the grate followed by afterburning of distilled zinc vapors with the formation of zinc oxide from furnace gases are known.

However, the known methods are inefficient due to the lack of the necessary mechanization and automation of the process and do not ensure the production of finely dispersed zinc oxide with enhanced weather resistance.

The proposed pyrometallurgical method does not have these disadvantages. This is achieved by the fact that the technological process is carried out on a mobile grate, at a speed of movement of 2-3.2 m / h, with air supply through a layer of charge from 800 to 1200 lVVI, at a temperature in the layer not lower than 1100 ° and in the chamber the furnace is not lower than 1000 °, with a content of fine anthracite in the charge from 30 to 45%. with loading of the latter on a layer of a larger coal, for example, AM. In this case, the initial mixture is subjected to briquetting.

To reduce slag sticking to the grate, steam is fed under it.

Zinc oxide dust with a particle size of less than 10-15 microns is obtained by performing the following process:

coal is loaded onto the grate, for example, AM brand anthracite, the ignited layer of which (per pillow) is loaded with a mixture consisting of carefully mixed zinc ash (55-70%) and smaller anthracite, for example, AC grade 30-45 %

No. 146900-2. Through the coal cushion and the charge layer, the air is continuously blown cold, or better heated, for example up to 2000 ° C (or enriched oxygen blast), while the grid is progressively mixed at a speed of 2-3.2 m / s.

The technical effect of the invention is to increase the efficiency of the equipment and improve product quality. At the same time, an economic effect is achieved in the form of a reduction in the cost of white, obtained by the method described.

The Rostov Economic Council reported that in accordance with the present invention, a pilot plant was manufactured, the operation of which showed its efficiency.

Based on the results of this operation, a decision was made to build a zinckelling plant of high production at one of the factories of the economic council.

Subject invention

Claims (3)

1.Pyrometallurgical method of processing of free zinc ash by reducing it in a mixture with a solid reducing agent on the grate with subsequent burning of 2 m, distilled zinc vapors with the capture of zinc oxide from the furnace gases, characterized in that, in order to mechanize and automate the process and increase productivity and obtaining finely dispersed zinc oxide with increased weather resistance, the process is carried out on a mobile grate, at a speed of movement of 2-3.2 m / h, feeding spirit through the layer of the charge from 800 to 1200, temperatures in the layer not lower than 1100 °, and in the furnace chamber not lower than 1000 °, with a content of fine anthracite in the charge from 30 to 45%, and loading the latter on a layer of a larger coal, for example brand AM. 2. A method according to claim 1, characterized in that the initial charge is subjected to briquetting. 3. Method according to paragraphs. 1 and 2, that is, so that, in order to reduce the slag sticking to the grate, steam is fed under it.