SU1019203A1 - Furnace for producing zinc oxide - Google Patents

Description

The invention relates to the chemical industry, in particular to Furnaces for the production of zinc oxide from zinc-containing raw materials used in the paint industry.

Shaft furnaces for producing zinc oxide from zinc-containing raw materials are known in which zinc vapors are produced in a reducing environment of high-temperature converted natural gas passing through a layer of agglomerated zinc-containing raw materials, and the subsequent oxidation of zinc vapors in the oxidation chamber. for the difficulty of removing slag from them.

The closest to the invention in terms of technical essence and the achieved result is a furnace for producing zinc oxide, containing cyclone evaporation and oxidation chambers separated by a partition, a device for preparing products of high-temperature conversion of gaseous fuel and a charging device ..

A disadvantage of the known furnace is the impossibility of obtaining on it an oxyzinc from secondary zinc-containing raw materials, such as velcoxide, etc.

The aim of the invention is to increase the degree of zinc recovery.

This goal is achieved by the fact that in a furnace containing cyclone evaporation and oxidation chambers1 | separated by a partition, a device for preparing and delivering high-temperature conversion products of gaseous fuel and a charging device, the evaporation chamber is inclined relative to the horizontal axis in the direction of the oxidation chamber a partition placed perpendicular to the axis of the chamber; the evaporation and oxidation chambers are provided with slag debris placed in the lower part of the chamber. camera-to partitions and apparatus for preparing and feeding the high temperature conversion of gaseous fuel products is connected to a feeder.

The angle of inclination of the evaporation chamber is 5-1.

Making the angle of inclination of the evaporation chamber less than 5 ° will not ensure a stable process for removing liquid slags, since the small angle of inclination

due to the low fluidity of the liquid slags, the cyclonic effect in the chamber will be disturbed. Performing a tilt angle greater than 1 can lead to intensive removal of liquid slags with a significant content of zinc oxide in them, which has not yet entered the recovery process. Limiting the angle of inclination 15 provides the residence time required in the evaporation chamber for the most complete extraction of zinc from the raw material.

FIG. 1 shows schematically an oven, a longitudinal section; in fig. 2, section A-A in FIG. one.

The furnace contains a metal co-liner 1, lined with a high-refractory and thermally insulating material 2, in which the oxidizing k 3 oxidative k and the oxidative 5 / chamber are placed. The evaporation chamber 3 is separated from oxidizing C by a partition 6 with a conical protrusion and aperture 7. The oxidizing chamber 4 5 is equipped with a guide partition 8 to prevent slag particles from entering the oxidizing chamber k and their withdrawal.

Hatch 9. and cover 10 are for inspection and repair of the stove.

For removal of the liquid slag from the evaporation chamber 3 and the intermediate between the partitions 6 and 8, slag removal channels 11 are made, placed in a hydraulic lock 12

The furnace contains a zinc-containing feed system consisting of a hopper 13, a screw feeder U, a pneumatic ejection feeder of the mixer 15 and a nozzle 16.

The lance 17 serves to supply air to the oxidizing and pre-oxidative 5 chambers.

The furnace works as follows. The crushed zinc-containing raw material, for example, velcoxide or gray oxide gray, is fed from the hopper 13 by means of a screw feed n 1 through an ejection, feeder - mixer 15 and nozzle 16 into chamber 3 preheated to 130 ° -1400 ° C.

Zinc-containing raw material is fed in a mixture with air and natural gas in the ratio of incomplete combustion at a speed of at least 50-60 m / s. 55 Due to the cyclone effect, the centrifugal forces throw the charge particles onto the chamber walls and the high-temperature converted gas formed during the combustion of the mixture at

Claims (2)

1. FURNACE FOR PRODUCING ZINC OXIDE, containing a cyclone evaporation and oxidation chambers separated by a partition, a device for preparing and supplying high-temperature conversion products of gaseous fuel and a loading device, characterized in that, in order to increase the degree of zinc extraction, the evaporation chamber is made with an inclination relative to the horizontal axis to the side of the oxidation chamber, the oxidation chamber is provided with a partition placed perpendicular to the axis of the chamber, evaporative and oxidizing amers equipped shlakootvodami placed at the bottom of chambers before baffles and a device for preparing and supplying high-temperature gaseous products from the fuel conversion 'is one with the loading device. 2. The furnace according to claim 1, characterized in that the angle of inclination of the evaporation chamber is 5 “15 °.