SU1479002A3 - Method of producing sulfur dioxide - Google Patents

Abstract

This invention relates to methods for producing sulfur dioxide from flotation concentrates containing non-ferrous metals. The aim of the invention is to eliminate the formation of calcine and the production of an alloy of iron oxides, suitable in ferrous metallurgy. Dusty flotation pyrites containing wt.%: Total sulfur 38-49

non-ferrous metals, of them with a grain size from 0.090 to 0.200 mm 13.2

from 0.60 to 0.090 mm 22.3

0.030 to 0.060 mm 54.5

less than 0.030 mm - 10, fired at 1600-1800 ° C in a vertical cyclone kiln in the downstream of combustion products. This results in the oxidation of sulfur contained in pyrite in the form of sulfides and sulfates, as well as the evaporation of non-ferrous metals. Next, the calcining products are introduced into the separation chamber, in which the gas and the liquid alloy of iron oxides are separated, containing mainly FE ₃ O ₄ and FE ₂ O ₃ . The S content in this alloy is no more than 1.2% by weight. The resulting gas has the following composition, wt.%: SO ₂ 11,5

O ₂ 0.3

SO ₃ traces: H ₂ O, CO ₂ , N _{2 the} rest. 1 il.

Description

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This invention relates to methods for producing sulfur dioxide from flotation pyrites containing non-ferrous metals.

The aim of the invention is to increase the purity of the produced gas, eliminate the formation of calcine and obtain an alloy used in the steel industry.

In the drawing, an installation by means of which the proposed method is carried out.

The drawing shows the cyclone furnace 1, the gas cooler 2, the combustion chamber of the furnace 3, the reaction chamber 4, the separation chamber 5, the bunker 6, the fittings 7-11 for the input and output of products, the gas lines 12 and 13, the blower 14.

Example 1. Flotation dust pyrites of the following chemical composition, wt.%: Fe 43,15; S 49.0; C 0.20; Pb 0.20; Zn 0.50; As 0.10; CaO, 30j HgO 0.70; Si02 0.95; others the rest, with a particle size,%:

 cm

0.090-0.200 mm 13.2; 0.060-0.090 mm 22.3; 0.030-0.060 mm 54.5; less than 0.030 mm 10 through the hopper 6 is fed into the cyclone reaction chamber 4 in the descending stream. At the same time, the fuel gas is fed into the combustion chamber 3 through the nozzle 7, and the air preheated to 750 ° C through the nozzle 8. From the combustion chamber 3, the flue gas with a temperature of 1200 ° C is sent to the reaction chamber 4, where, at, 1800 ° C, the oxidation of sulfur contained in pyrites in the form of sulfide

feeds and sulphates, in 80, and also there is an evaporation of non-ferrous metals and melting of pyrites. As a result of the cyclone action of the combustion chamber 3 and the reaction chamber 4, the flue gas and pyrite are vortexed, which promotes vigorous stirring and accelerates the oxidation process. The latter occurs in the range of temperatures in which the very low is determined by the melting temperature of the sulfur-bearing ore, and the highest by the evaporation temperature of the nonferrous metals contained in the ore. The result is a gas containing, wt.%: S02 11,5; 0 0.3; S03 traces, NgO, Na, C02 else. Next, the calcining products are introduced into the separation chamber 5, in which the gas and liquid iron alloy are separated at a temperature of 1500 ° C, which is discharged through fitting 9. A hot temperature of 1800 ° C containing contaminants in the form of microdroplets of iron and uncondensed alloy non-ferrous metal vapor, is removed from the separation chamber 5 through the nozzle 10, and then through the pipeline 12 serves under the fluidized bed of the gas cooler 2, in which it is cooled to 400 ° C, and through the nozzle 11 is sent to the system of dry and wet dedusting. The cooled gas contains condensed dust of an alloy of iron and non-ferrous metals. The amount of dust in the gas is a maximum of 442 kg / h, depending on the content of non-ferrous metals in pyrites.

In the process of gas cooling, continuous crystallization occurs and

microdroplets of iron alloy condensation 73% of the product being calcined.

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five

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and vapors of non-ferrous metals contained in gas.

PRI mme R 2. Flotation pyrites of the composition according to the example and grain,%: fraction 0,090-0,200 5; 0.060-0.090 22; 0.030-0.060 43; less than 0.030 30.

The temperature of the air supplied to the combustion chamber is maintained at 500 ° C, the temperature of the flue gases is 1000 ° C, the temperature in the reaction chamber, the furnace / vl600 ° C. The process, as in example 1.

In the firing of pyrites receive gas composition, wt.%: 50 11,53; C0t 3.19; 0 1.7; HgO 4.05; rest

An alloy of iron oxides consisting of

from and Fe20, has the following composition,%: Fe 66,0; C 0.48; Zn 0.20; S 0.9 and others - the remainder.

When particles of size less than 0.060 mm in an amount of 5 less than 60% are contained in the pyrite, transfer of cinder in the form of dust to the exit of the separation chamber, the content of sulfite sulfur in the dust-like fraction of cinder is 10-15%, and the sulfur content in the iron alloy is 7% while according to the proposed method, the sulfur content in the iron alloy does not exceed 1.2%, which makes it possible to use it in ferrous metallurgy, moreover, the formation of calcine is excluded.

Claims (1)

Invention Formula five A method of producing sulfur dioxide, including burning calcined flotation pyrites containing non-ferrous metals at 1600-1800 ° C in a vertical cyclone furnace in the downstream of the products of combustion, separation of the molten metals and calcined gas, and cooling of the latter, in order to prevent the calcine from forming and to produce an alloy suitable for the ferrous metallurgy industry, by reducing the it sulfur, firing is subjected to pyrites with a particle size below 0.06 mm in the amount of 64.5 73% by weight of the calcined product. Compiled by L. Temirova Editor L. Gratilo Tekhred L. Serdyukova Proofreader S.Shekmar Order 2379/58 Circulation 435 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 J Subscription