SU891555A1 - Method of sulphur production - Google Patents

Description

(54) METHOD FOR PRODUCING SULFUR

The invention relates to the production of sulfur from sulfur-containing materials according to an autoclave-flotation scheme and can be used to extract elemental sulfur from sulfur-containing middlings of hydrometallurgical complex processing of pyrrhotite concentrates and from enrichment products of native sulfur ores containing sulphide and clay minerals. A known method for extracting elemental sulfur from sulfur-containing materials, for example, from the sulfur-sulfide products of hydrometallurgical processing of pyrrhotite-containing ores and concentrates, by heating their aqueous slurry in an autoclave, results in the melting point of sulfur in the presence of sulfur sodium 1. The disadvantage of this method of producing sulfur is the high cost of sodium sulphide. The closest technical solution to this invention is a method for the production of sulfur from sulfur-containing polymers, including, in addition to elemental sulfur, iron sulfides and other metals. The aqueous pulp of sulfur-containing material is treated with steam in an autoclave in the presence of soda ash, which is much cheaper than sodium sulphide f2. The disadvantage of this method is low sulfur recovery (69%), due to the low efficiency of the reagent used — soda ash. The purpose of the invention is to increase the degree of extraction of the target product. The goal is achieved by the fact that in a known method involving the treatment of water pulp of sulfur-containing material with steam in an autoclave in the presence of soda ash, the latter is pre-treated with a sulfur melt at 190-300 ° C and a ratio of 1: 1-2.5, respectively. Pretreated soda is introduced into the autoclave in an amount of 0.15, 0% by weight of the sulfur-containing mother. Pretreatment of soda ash with molten sulfur is carried out in the reactor with stirring for 120 minutes. The optimal weight ratio of soda and sulfur is 1: (1-2.5), respectively. The interaction of soda with sulfur under these conditions proceeds most fully under aES-3 O.C. The resulting treatment product is introduced into the pulp of a gray-containing material and melted. Example. 200 g of sulfur-containing material in the form of an aqueous slurry (at a T: W ratio of 1: 1) are loaded into a 0.6 l autoclave equipped with a stirrer, the product of soda ash treatment with molten sulfur obtained at a soda to sulfur ratio of 1: 2 is added, 5, respectively, is heated by steam for 40 minutes to the temperature of the melting point of sulfur under stirring. Then, after the steam injection, mixing and five-minute sludge, the sulfur is drained from the autoclave and, thereafter, the tailings smelting pulp. Sulfur-containing material is taken: a) sulfur-containing sulfuric material with elemental sulfur content of 39.8% (sample 1) b) sulfur-containing material Norilsk material with elemental sulfur content of 71.14% (sample 2); c) volcanogenic sulfur ore from the Novoe deposit, containing 24.5 elemental sulfur (sample 3);

Trial 2 Famous Offer

Sample 3 Offered

5.0

60.0 80.1 5.0

87.4 Recovery

sulfur according to a known method is 69%. g) razdolsky sulfur concentrate containing 68.0% of elemental sulfur (sample 4). Sulfur recovery experiments from the poor in content of elemental sulfur of the Norilsk sulfur sulfide material (sample 1), as well as from volcanogenic sulfur ore (sample 3) are carried out in two stages: disintegration (erosion of sulfur splices), followed by decalcification of sulfur-rich 1 grade + 0 , 15 mm and the actual allocation (melting) of sulfur in the form of a marketable product. Disintegration is carried out as follows. Sulfur-containing material in the form of aqueous pulp with a T: W ratio of 0.8: 1.5 is heated by steam in an autoclave to a temperature above the melting point of sulfur with mechanical stirring for 40 minutes in the presence of a product of soda ash treatment with sulfur melt. Then the pulp is cooled, released from the autoclave and classified on a 0.15 mm sieve. From the polar product of disintegration sulfur, as the target product, is extracted by autoclave melting. The results of experiments on obtaining sulfur are presented in the table.

Sample 4 Famous Suggested

Comparative experiments on the production of sulfur by the proposed method and by a known method show a significant increase in the degree of sulfur recovery.

The invention makes it possible to replace the scarce and expensive technical sodium sulfide used in the extraction of sulfur from the Norilsk sulfur sulfide materials with a less expensive product of soda ash treatment with sulfuric melt and to increase the degree of sulfur recovery in the processing of native sulfur ores by the autoclave-flotation method.

Claims (2)

1. A method for producing sulfur from sulfur-containing materials, comprising Continued table. 0.25 74.0 Processing product 81,8 , 35 keshtsinirovannogo sulfur added as a fourth reagent (in addition to the known reagent mode: sodium tripolyphosphate 0.5%, kg scintered soda 0.25%, kerosene 0.65% by weight of the concentrate), treatment of the water supply of the starting material. by steam in an autoclave in the presence of soda ash, which is due to the fact that, in order to increase the recovery rate of the target product, soda ash is pretreated with a sulfur melt at 190-300 ° C and a ratio of 1: (1-2.5) , respectively. 2. A method according to claim 1, characterized in that the pretreated soda is introduced into the autoclave in an amount of 0.1-5.0 weight. % Information sources, taken into account in the examination 1. Color metals. 1974, 72, p. 34-36. 2. Japanese Patent 35-17113, series 2 Art. 656, 1960.