SU42987A1 - The method of obtaining sulfur from sulfur ores - Google Patents

Description

SUMMARY OF THE INVENTION The present invention concerns methods for producing sulfur. Most of the currently existing industrial methods for producing sulfur are based on obtaining sulfur from native sites of volcanic or gypsum origin. There are almost no industrial methods for the production of sulfur from sulfur ores. Literature available in this field relates to methods for producing sulfur from sulfur compounds mainly through hydrogen sulfide or sulfur dioxide.

The proposed method is similar to copper leaching from copper sulphide ores. Of particular interest is the application of this method to sulfurous ores of the Kola Peninsula, pyrotins, relatively poor in sulfur and therefore economically disadvantageous with other methods of processing.

The proposed method for producing sulfur from sulfur ores is as follows. The pre-crushed, sometimes possibly calcined, sulfur ore is treated with a solution of ferric chloride.

At the same time, all metal components of the ore (iron, copper, lead, noble metals) are dissolved, while sulfur remains in the spongy form. Sponge sulfur by distillation or remelting is cleaned and obtained

(125)

in pure form in the form of cuttings or powdered sulfur.

The solutions of ferric chloride, after removing more noble metals than iron from them, are regenerated back into the ferric liquor liquor, removing excess iron from the solution.

The removal of more noble metals than iron can be made by cementation or better by electrolytic processing of the initially acidified solutions of ferric chloride.

The regeneration of the ferric chloride solution can be carried out in the following ways:

I. Electrolytic oxidation of a solution of ferric chloride in a solution of ferric chloride

FeCl2-Fe ++ - f 2C11 2FeCl2 + 2C11 + | 2F - ZFeClg

(anode process)

 IF

(cathodic process)

With cathodic production of metallic electrolytic iron as a by-product.

P. By electrolysis of part of the solutions of ferric chloride to produce dense metal metallic iron on the cathode and gaseous chlorine gas on the anode, which leads to the oxidation of the rest of the ferric chloride solutions in the ferric liquor.

Iii. A possible regeneration cycle is the oxidation of the iron chloride liquor by oxygen in the air.

12FeCl2 + 6H2O + 3O2- (OH) g + 8FeCl2

In this case, as a by-product, an iron oxide hydrate is obtained, which can be used for further processing into iron paints or, by weathering as FegOg, for metallurgical processing. Option 111 would probably be the most cost-effective.

The subject matter of the invention.

A method of producing sulfur from sulfur ores, characterized in that these ores, in their ground state, are treated with a solution of ferric chloride to convert the bound sulfur to free, and the metallic element to a salt.