DE77335C - Process for the preparation of sulfur from hydrogen sulphide and sulphurous acid - Google Patents

Description

IMPERIAL

PATENT OFFICE.

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The subject matter of the present invention relates to a method for utilizing the When roasting sulfur-containing ores, the sulphurous acid formed in order to reduce the amount contained in them To gain sulfur.

The sulphurous acid is first imparted in a known manner by reduction Carbon and hydrogen converted into hydrogen sulfide. The. resulting from roasting In addition to sulfurous acid anhydride, gases contain nitrogen and Free sulfur also includes arsenic and sulfur antimony, which are likely to have take part in the chemical processes, which, however, has little significance since the Arsenic and antimony compounds, which are later found in an excess of moist Hydrogen sulfide can compress only when sulfur compounds are present.

On the hydrogen sulfide obtained in this way a freshly added amount of sulfurous acid anhydrite free of arsenic and antimony is added brought into effect:

SO ₂ + 2 K ₂ S = 3 S + 2 H ₂ O.

This reaction is not unknown, but has not yet been carried out in practice will; however, practical implementation is achieved through the present procedure, in which

1. the gases must be mixed in the dry state,

2. The steam is only added when a homogeneous mixture has been achieved is,

3. the temperature is at least 100 °.

According to this, the gases, which hydrogen sulfide and eventual, volatile arsenic and Antimony compounds, as well as containing dust, are first cooled, making the compressible Connections sit down at the same time as the dust. To bring about this cooling use is made of cement pipes which are immersed in water and which are passed through during their operation Hydrogen must be cleaned.

The gases cooled in this way then pass into one or more tower containers, which with calcium chloride in porous pieces and of sufficient size to allow rapidity of gases not exceeding 50 cm per second, are filled so as to be sufficient To effect drying, as well as filtering the gases at the same time.

The gases, now dried and filtered, are mixed with sulphurous anhydrite. Sulfurous anhydrite, which is produced when roasting pure ores, is preferable. H. contains neither arsenic nor antimony.

The sulfurous anhydrite is first cooled, dried, and filtered by pouring it through Tower container goes, which with cone. Sulfuric acid sprinkled coke are filled. The sulfurous anhydrite is then the hydrogen sulfide, which also, as above indicated, has been cleaned, added; the mixed gases are then converted into a Series of alternating ascending and descending channels, which at the same time have a recuperator and bring the temperature of the mixture to 100 ° C. or a little higher.

Claims (1)

This apparatus is doubled in that the free cell is heated by burning water gas will. When exiting the recuperator that creates the mixture, the gases are entrained by streams of steam and forced into the condenser. In the latter apparatus the mutual action of the two gases is caused by contact with water vapor spawned. The sulfur strikes, depending on the temperature at which this action occurs is made, in solid or liquid state. It is to be observed that the action is complete if, as in the above Equation given, the two gases in the ratio of 2 volumes of hydrogen sulfide to i volume of sulfurous anhydrite is present. However, the hydrogen sulfide can be im To be used in excess by remaining without influence; but this should be excess be as small as possible, which is achieved by the fact that the supply of sulfurous anhydrite is regulated by experiments. Patent claims: Process for the preparation of sulfur from sulphurous acid and hydrogen sulphide, which can be obtained by reduction of sulphurous acid, characterized in that that the gases in the dry or dried states are mixed and heated, and that the reaction is then only initiated by the introduction of steam.