SU1678876A1 - Process for producing zinc oxide - Google Patents

Abstract

This invention relates to zinc metallurgy, in particular to the rolling of zinc-containing raw materials. The aim of the invention is to intensify the process and reduce fuel consumption. The oxidized zinc and lead-containing ore is mixed with hertsinitsoderzhaschimi waste electrothermal processing of polymetallic raw materials and valtsevanie lead with respect to hercinite in addition to the amount of silicates of lead and zinc in the ore, equal to 1.8-2.0. The temperature in the reaction zone is maintained at 1150 ° C. 2 tab.

Description

This invention relates to the metallurgy of non-ferrous metals and can be used in the preparation of zinc oxide from oxidized zinc lead-containing materials.

The aim of the invention is to intensify the process and reduce fuel consumption.

The method is carried out as follows.

The sludge fraction of the oxidized ore is mixed until a homogeneous mass is formed with the waste of electrothermal processing of polymetallic raw materials (electrothermal processing slag of lead zinc collective concentrates) containing hercynite. The amount of additive is determined by the ratio

1.8-2.0

Zn2 SI04 + RZUZ

The sand fraction of the oxidized ore is added to the mixture and the material is sutured. The mixture is fed to the charging chute of the Waelz furnace, coke breeze is also loaded there. Welz process is carried out at a temperature in the reaction zone of the furnace 1050-1070 ° C.

The clinker is discharged from the furnace, cooled in a sump with water to a temperature of 80-100 ° C and sent to the warehouse (since 70-80% of it consists of Cao-PeO Al2O3 SiO2, it can serve as a raw material for the production of building materials), and -fills containing zinc, lead, trapped in coolers and bag filters and sent for further processing.

Example 1: Effect of Hercinite Supplement (Laboratory Tests).

Sludge fraction of oxidized zinc-containing ore, having the composition,%: zinc total. 10.8; lead total 0.2; silica 7.5; calcium oxide 15.8; zinc strength. 9.6; lead forces. 0,14, mixed in the laboratory

WITH

with

about

XJ 00 00

VI

(ABOUT

the mixer for 5 minutes with the synthesized pyrohydrometallurgical resin, hertsinite having the composition,%: iron oxide (11) 41.1; alumina 58.9. To the mixture is added the sand fraction of the oxidized zinc-containing ore composition,%: zinc total. 10.6; lead 0.3; silica 3.0; calcium oxide 17.2; zinc strength. 3.2; lead forces. 0.04. Sludge and sand fractions are mixed in a 1: 1 ratio (oxidized zinc-containing ore after ore preparation is supplied in the indicated ratio of sludge and sand fractions). The addition of Hercynite is selected from the need to ensure that the ratio of Hercynigus to the sum of zinc and lead in the form of silicates in the ore is 1.7; 1.8; 1.9; 2.0; 2.1. The resulting mixture is loaded simultaneously with coke breeze into the laboratory velts-lie down (diameter 0.15 m, length 2 m). Veltsevaniye carried out at a temperature in the reaction zone of 1070 ° C. Lead and zinc distillation rates, zinc and lead content in clinker, fuel consumption, and the condition of the material in the pie are determined.

Since these industrial advances, oazlichnoe fuels are used (fuel oil, gas, because of ivSoht4VHHbui k-oxy). then fuel consumption in grglg / h: h is given in terms of standard fuel (fuel having a caloric content of 7000 kcal / kg).

For comparison, experiments were carried out on the well-known pus method.

The mixture consisting of oxidized zinc-containing ore 90%, quartz sand%, production of ferrosilicon production 7%, is mixed with coke breeze in an amount of 20% by weight of the mixture.

Oxidized ore is used for Veltseva. Slag composition,%: calcium oxide 11.1; silica 42.8; alumina 12.3; iron 6.1.

The Welz process is carried out under the conditions described.

The results of the experiments are given in table. 1, As can be seen from the table. 1, at G / Znz SI04 RZU 2,0, the positive effect does not increase and even slightly decreases (1-2%) the sublimation ability.

When the ratio.

1.8, the poisoning indices deteriorate sharply, the sublimation rate drops from 7.2–8.1 to 4.7–6.8 kg / h, zinc does not have time to completely distill, and the material from the furnace leaves with incomplete distillation of zinc with go zinc. A comparison of the proposed method with the well-known shows that with

addition to the hercinite charge, the sublimation ability of the furnace increases from 1.8–5.1 to 7.2–8.1 kg / h, and if the fuel consumption that ensures normal welling

according to a known method, it is 180 kg of fuel condition / ton of charge, in the proposed method, the optimum fuel consumption is 10-60 kg lower and is 120-170 kg of fuel condition / ton of charge,

Example 2. Effect of material containing hertsinit.

Sludge fraction of oxidized zinc-containing ore, having a composition,%: zinc total. 10.8; zinc strength. 9.6; lead total

5 0.2; lead forces. 0.14; silica 7.5; calcium oxide 15.8; mixed in a laboratory blender for 5 minutes with the hertsine-containing wastes from electrothermal processing of polymetallic raw materials,

0 representing slag from electrothermal production of zinc from collective copper-zinc concentrate composition,%: zinc 6.9; lead 0.6; Hercynite 52. To the mixture is added a sand fraction of the oxidized zinc-containing ore composition,%: zinc total. 10.6; zinc strength. 3.2; lead total 0.3; lead forces. 0.04; silica 3.0; calcium oxide 17.2. Slama and sand fraction are mixed in the ratio 1: 1. The amount of waste electrothermal zinc is selected on the basis of obtaining the ratio of Hercinite in addition to the sum of lead silicates and zinc in the ore, equal to 1.7; 1.8; 1.9; 2.0; 2.1.

5 The resulting mixture is loaded simultaneously with coke breeze into the Waelz furnace. Veltsevaniye carried out at a temperature in the reaction zone of 1070 ° C. The rate of sublimation of zinc and lead, the zinc content

0 and lead in clinker, coke breeze consumption, material state in the furnace.

For comparison, experiments were carried out by a known method.

The mixture consisting of oxidized zinc5 containing ore 90%, quartz sand 3%, waste slag of ferrosilicon production 7% is mixed with coke breeze in an amount of 20% by weight of the charge.

For valtzing, an oxidized ore 8 is used as waste slag from the production of ferrosilicon; slag composition is used,%: calcium oxide 11.1; silica 42.8; alumina 12.3; iron 6.1.

The Waelz process is carried out under the conditions described previously,

The results of the experiments are given in table. 2. As can be seen from the table. 2, with SI04 + PbH2> 2.0, the positive effect does not increase and even slightly (about 1%) the degree of distillation decreases. With

r / Zn2SiCM + PbSlOa is less than 1.8, and Weltsev performance drops sharply: the sublimation rate drops from 6.9-7.9 to 3.5-6.4 kg / h. There is not enough time for the material in the furnace, since the rate of zinc and lead distillation is low and the clinker leaves the furnace with a visually observed burning of zinc.

A comparison of the proposed method with the known one shows that with the addition of Hercynite to the mixture, the sublimation rate increases from 1.8-5.1 to 6.9-7.9 kg / h, moreover, if satisfactory progress of the Veltsevan process takes place with the fuel consumption With a prototype of 180 kg of fuel condition / ton of charge, in the proposed method, the optimum fuel consumption is 10-60 kg lower than 120-170 kg of conventional fuel / ton of charge.

The use of the proposed method in comparison with the known intensifies the process of baling by increasing

zinc and lead sublimation rates by 1.8 times, reduces fuel consumption by 10-50 kg of fuel condition / ton of charge, reduces the zinc content in clinker by 1.5-2.5 times, and lead by more than 1.3 times .

Claims (1)

The invention of the method for producing zinc oxide from oxidized zinc-containing ore, comprising mixing the ore with an additive containing iron oxide and aluminum, and mixing the obtained mixture with a carbon-containing reducing agent, in order to intensify the process and reduce fuel consumption, as an additive Hertinsite-containing waste from electrothermal processing of polymetallic raw materials is used, and Velsing is carried out at a ratio of Hercynite to the amount of lead and zinc silicates in the ore 1.8-2.0. Spreadsheet with burning tsnn.Prodolzhenie tab.1 Weltsuit Fused, overheated Undermined, vel-custas satisfactorily table 2 Continued tabl ..