SU947030A1 - Method for isolating sulphur - Google Patents

Description

(54) METHOD OF SULFUR ISOLATION

This invention relates to the field of hydrometallurgy and can be used to separate elemental sulfur from sulfur sulfide materials. . A method is known for extracting sulfur from sulfur-containing materials by autoclaving the treatment of water pulp of the raw material in the presence of a hydrophilizer, taken in an amount of 0.37-1.3% of the weight of the solid, followed by cooling the pulp to a temperature below the melting point of sulfur. The disadvantage of this method is - in that it is not applicable to serosulphidic material with an elemental sulfur content of 30%. The closest to the technical essence and the achieved result is the method of sulfur extraction from sulfur-sulfide materials, including the disintegration of sulfur and sulfides in the autoclave battery by processing the PU; 1 hp sodium sulfide at 125-13 ° C in the presence of a surfactant - kerosene amount up to 0.2 wt.%. Next, the pulp is cooled in a self-evaporator to 8–100 ° C, and then in reactors up to 4–45 ° C, sulfur is separated from sulphides by flotation. The disadvantage of this method is the low yield of sulfur granules up to 1.5-2, O% and the complexity of the subsequent sulfur separation. The purpose of the invention is to increase the recovery of sulfur into granules released prior to flotation and to simplify the process. The goal is achieved by disintegration in the presence of kerosene in an amount of O, 25-1, O wt.%, Followed by stepwise cooling of the pulp, first to 117-113 ° C, and then to 1O7-1OZ C. Oyasob are carried out as follows. A serosulfide concentrate in the form of an aqueous suspension mixed with a water solution of a hydrophilizing agent — sodium suphide and a surfactant with kerosene in an amount of 0.25–1.0%, preferably 0.5% by weight of solid, is fed to the first stage autoclave, where pulp is treated at a temperature of 125-130 C, which ensures the melting of sulfur. Then the pulp enters the subsequent stages, where the temperature is reduced to dL 115-106 0. The pulp of the last stage is directed to the self-evaporator for cooling. Sulfur granules from the pulp are recovered at the screen or at the classifier.

Example. The raw materials are taken in the form of a serosulphide concentrate pulp, obtained using an autoclave oxidative technology for the processing of pyrrhotite concentrates, with a content in solid wt.%. picket 7.89; copper3.23; iron 28.3; sulfur is total 27.16; including elemental 29, O1. As a hydrophilizing agent, a solution of sulfur-: sodium nitrate with a concentration of 125 g / l is used, and as a surfactant - technical kerosene GOST 4753-68.

The test was conducted continuously in a battery consisting of three cascaded autoclaves with a volume of 0.65 m each. The filling amounts to 60, 35O and 4OO l respectively for the first, second and third autoclaves. The pulp productivity of the initial serosulfide concentrate is ZOO l / h, and the sodium sulfide solution is 1OO l / h. The consumption of sodium sulfide is adjusted for its residual concentration after disintegration and support

at the level of 3-5 g / l. Netri sulfide consumption is 5.1% by weight of the processed solid. Kerosene in the pulp is served in quantities of O, I; O, 2; 0.25; Oh, 5O; 0.75 and 1,% of the weight of the loaded solid. A mixture of the original pulp with sodium sulfide and kerosene is fed to the first autoclave, in which the pulp is processed at I2Qt2 ° C with continuous stirring, and then it goes to the second and third autoclave, where in 1 and 2 experiments it was processed at the same temperature, and in 3 -8 - with a stepped decrease in temperature. Upon reaching a certain level in the last autoclave, the pulp is automatically discharged into a self-evaporator, where it is cooled and sent to sulfur flotation. The flotation time is 2 min.

The results are presented in the table.

As can be seen from the results of the table, increasing the dosage of kerosene in the known method (experiment 2) does not allow. highlight sulfur into pellets. The application of stepwise cooling of the pulp at the stage of disintegration at the dosage of kerosene O, 1-O, 2% also does not give a shockable effect. And only the combined effect of the stepped temperature mode and the increased consumption of surfactant - kerosene of 0.2 5-1% makes it possible to enlarge the sulfur and granulate it up to 1O-55% before sulfur flotation and thereby reduce the flow directed to the flotation, thus to simplify the separation of sulfur from sulphides, as well as to increase the total sulfur recovery to 8О-89%.

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Claims (1)

The formula of the invention flotation, differing The method for extracting sulfur from pulping, in order to increase the recovery serosuphid materials, including sulfur in granules released before the flotation-continuous disintegration of sulfur and sul-Dy, are introduced into the disintegration stage of kerosene feeds by processing the pulp of sulfides nat-5 in the amount of 0.2 5-1.0% by weight of solid ri in the presence of kerosene at temperature and disintegration is carried out at a stepwise 125–13 ° C round, stepwise cooling-lowering of temperature first to 117e pulp and separation of sulfur from sulphi-113 ° C, and then to 107-1 O3 ° C.