RU103799U1 - REEXTRACTOR FOR EXTRACTION OF ELEMENT SULFUR - Google Patents

Abstract

 A reextractor for separating elemental sulfur, including a heated vacuum suction filter located on a water-cooled collector with a spherical bottom for collecting the suspension, and a shut-off device for unloading the cooled suspension.

Description

The utility model relates to hydrometallurgical units for the separation of elemental sulfur from organic extractants.

Known screw extractor for sulfur extraction, containing an ore supply system, a screw for moving ore, a filter and a distillation apparatus, heated by a coil [Menkovsky MA and other Natural sulfur, Publishing house "Chemistry", M., 1972, 240 pp.].

Known extractor (patent for utility model No. 40633), adopted as a prototype, which is a sealed enclosure consisting of two parts connected by means of flanges. In the upper part of the housing there is a feeder for loading raw materials and a drive hydraulic cylinder, which provides movement of the traction chain with perforated scrapers. In the upper part of the lifting column of the extractor is a meal discharge device with an extruder and a ball valve at the outlet. The supply of solvent is carried out through the pipe, and the extraction of the extract through the filter element and pipe.

The disadvantages of the prototype are:

- technically sophisticated equipment;

- the impossibility of obtaining pure, cuttings of sulfur;

- insufficiently high sulfur recovery (70-97%), irretrievable loss of extractant (1-2% by weight of the processed material).

The technical task of the utility model is to create an effective stripper for sulfur recovery and expand the arsenal of hydrometallurgical units.

The technical result that provides a solution to the problem is to simplify the design, simplify the process of extracting elemental sulfur into a marketable product, as well as to increase reliability and durability by eliminating moving parts.

The essence of the utility model is that the stripper for separating elemental sulfur contains a heated vacuum suction filter located on a water-cooled collector for collecting the suspension and a shut-off device for unloading the cooled suspension.

Fig. 1 shows a reextractor in a section.

A sulfur-saturated extractant at a temperature of 60-70 ° C is placed in a suction filter 1, heated by hot water or steam using a jacket 2, and the filtrate at the same temperature enters through a filter baffle 3 under the influence of rarefaction into a collection hopper 4. When the temperature of the suspension in the collector decreases due to the cooling jacket 5, elemental sulfur crystals are separated from the extractant. The cooled suspension through the locking device 6 is sent to a filter to separate sulfur, and the filtrate to the extraction processing of new portions of sulfur-containing materials. Cake nutsche filter stripper is directed to the extraction of valuable components (non-ferrous and noble metals).

In order to reduce the loss of extractant as a result of volatility at elevated temperatures and to increase sulfur recovery while cooling the saturated extractant reservoir, the extraction and filtering temperature should be no more than 70 ° С, and the suspension cooling temperature should not be higher than 20 ° С.

Examples of using the utility model:

Tetrachlorethylene (TCE) and turpentine were used as extractant. The solubility of sulfur in these extractants at various temperatures was previously determined.

As a sulfur-containing material for separating elemental sulfur from it, autoclave oxidative leaching cakes of sulfide copper concentrate were used, containing,%: 28.3-66.6 S _total. including 12.6-48.2 S °; 15.7-18.4 S _SO4 .

An extractant (TCE or turpentine) was added to the cake at a ratio of W: T = 3, the suspension was heated to 65 ° C with stirring, and loaded onto a stripping filter. The filtrate was cooled to a temperature of 18 ° C, the resulting suspension was separated on a filter, and the yield of elemental sulfur was calculated by weighing. The results are shown below.

Sulfur Recovery Results Extractant The total sulfur content in cake,% Content S °,% S _SO4 content,% Extraction S °, g, (%) TCE 28.3 12.6 15.7 12.55 (99.6%) 43,2 31,2 12.0 31.1 (99.7%) 66.6 48,2 18,4 48.1 (99.8%) Turpentine 28.3 12.6 15.7 12.56 (99.7%) 43,2 31,2 12.0 31.1 (99.7%) 66.6 48,2 18,4 48.1 (99.8%)

The obtained data confirmed the high efficiency of using the proposed model as an apparatus for sulfur reextraction.

Claims (1)

Reextractor for separating elemental sulfur, which includes a heated vacuum suction filter located on a water-cooled collector with a spherical bottom for collecting the suspension, and a shut-off device for unloading the cooled suspension.