SU508551A1 - The method of processing sulfide polymetallic materials - Google Patents

Abstract

The invention is intended to process autoclave leaching of sulphide in schmetallic materials. The aim of the invention is to intensify the process. Leaching is carried out in the presence of surfactants of the class of polysaccharides. As the surfactant, sulfite liquor is used in the amount of 200-1500 g / 7 of the starting material, 1 KOP, f-ly, 2 tabLo

Description

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The invention relates to methods for the hydrometallurgical processing of sulphide polymetallic materials used to convert sulfur to elemental and decompose sulphides for subsequent extraction and separation of valuable components, and can be used for the oxidative leaching of aqueous sulphates of various sulphide ores and concentrates, as well as matte, fine matte and other sulphide intermediates of metallurgical processing

It is especially impractical to use the invention to intensify the oxidative autoclave leaching of pyrrhotite-containing concentrates, both ore and artificially obtained, for example, during thermal decomposition of pyrite concentrates,

There is a method for processing sulfide polymetallic materials with sulfur transfer to elementary by leaching the aqueous pulp of the crushed material under oxygen pressure at a temperature above the melting point of elemental sulfur.

The most significant disadvantage of this method is that when leaching above 112 ° C, the elemental sulfur formed melts and covers the sulfide particles with a film that insulates them from further lower oxidation, i.e. the process virtually ceases. The latter leads to the fact that the proportion of sulfides entering the reaction with oxygen and the elemental sulfur dioxide

If the process is carried out at temperatures not exceeding the melting point of sulfur, Tovo is below 112 ° C, the speed of the process is low, and the task of maintaining the temperature strictly near 110 ° C places strict requirements on the process control and automation system. Moreover, the temperature is so low complicates the utilization of waste heat.

The proposed method is characterized in that the leaching is carried out in the presence of surfactants of the class of polysaccharides, such as dextrin, at a rate of 200-2500 g per ton of raw material or sulphite liquor at a rate of 200 to 150y g / t.

The noted ability allows to intensify the process, since the introduction of these additives allows for a higher level of depletion.

145 C. In this case, the most favorable is the temperature range from 120 to 1.70 C, within which the maximum yield of elemental sulfur is reached.

The introduction of these additives in the leaching stage (P1 does not exclude the possibility of a granulometry stage at the end of the process. For

F this, in accordance with the process parameters and the required degree of decomposition of sulfides, limits the consumption of surfactants and, upon cooling the pulp below the melting point of sulfur, forms sulfuric

0 granules. The possibility of carrying out the granulation stage after reaching the required complete leaching of sulphides is due to the fact that the surfactant under the effect of temperature, oxidant pressure and excreted during the reaction products gradually break down and lose activity. If the surfactant consumption for leaching is chosen without a large excess, the granulo formation runs stably . More than 95% of the sulfur and non-decomposed sulphides are recovered in the granules.

The above surfactants are not highly aggressive and do not increase the requirements for equipment corrosion protection. Within the limits of a given consumption, they are almost completely sorbirztots with sulfur and sulphides, without contamination of waste products of the process.

0 Usually, the resulting oxidized pulp is further processed to extract valuable metals from solution and solid, for example, using such processes as sorption, foam

5 flotation, sulfide precipitation (from the eluate) with hydrogen sulfide Recommended surfactants do not adversely affect these processes, and in a number of cases (flotation, sulfide deposition, etc.) are useful

The proposed method allows:

- to increase leaching productivity by 1.5-4.0 times, respectively, reducing the volume of equipment;

5 to simplify the temperature monitoring and control system, increasing the reliability of equipment operation J

- more fully use the heat of exothermic reactions due to the new coolant temperature and the parameters of the waste steam; - exclude heat consumption for heating the pulp at the stage of granulation (to increase the temperature of the pulp from 110 to 140 ° C). The method is carried out as follows. Water pulp, grinding of the sulfide material is loaded into the autoclave and leached under pressure of oxygen-containing gas (air, process oxygen, air enriched with oxygen) at a temperature above the melting point of sulfur (above 112 ° C), preferably between 120 and. The initial pulp (or directly into the reactor) is supplied with surfactants that prevent the wetting of the sulfide surface with a gray mass. The consumption of the surfactant is chosen (within 200–1500 g / sulfide material), based on the required decomposition depth of the sulfide (or the main sulfide mineral) and process parameters. When sulfur and residues of undecomposed sulfides are isolated in the form of sulfur granules, respectively, surplus surfactants supplied to the leaching stage are limited, and the granules are obtained by cooling the pulp below PU, the granules are separated from the pulp, the last ayut processing to recover valuable metals, such as with sorption, extraction, froth fpotatsii. Valuable components are extracted from granules by known methods. Examples illustrating the possibilities of the invention, based on the processing of pyrrhotite nickel-containing ore concentrate and copper concentrate from fayngateyn, two types of raw materials are given below. sharply differing both in chemical and mineralogical composition and in the method of preparation. In the examples given, the alkalinity of the pyrrhotite concentrate was chosen so that: maximally decompose the pyrrhotite (where, X 1), since this material is the ballast component of the given The copper concentrate of CRF was carried out so as to extract the copper as much as possible into the sulphate solution. In both groups of examples, the maximum depth of decomposition of sulphides was aimed at the maximum rate (minimum duration) process and the largest yield of elemental sulfur. Example of a 700 g sample of pyrrhotite concentrate containing the following components,%: copper 2.69, nickel 3.4G, iron 44.8; sulfur 24.4 (about 50% pyrrhotite) is liberated in water at a C: W ratio of 1: 1 and an oxygen partial pressure of about 3.0 atm and other conditions given in the table. From the data in Table 1, it is clear that leaching in experiments 3 -5 with the addition of surfactant provides a much greater decomposition depth of pyrrhotite (cf. experiment 2) and the flow rate of the process (cf. op1) compared with experiments 1 and 2, carried out in a known mode. : nickel 3.36; copper 2.03i iron 47.1 sulfur 27.2 are pulverized into 880 ml of water with 14 ml of concentrated sulfuric acid. 400 mg of sulfite liquor dissolved in water is added to the resulting pulp and leaching is carried out in an autoclave at 135 ° C and 2.5 at. After 90 min. the pulp is cooled and from it is squeezed onto a 0.15 mm sieve 160 g of granules with an average diameter of 0.8 mm of the following composition,%: nickel 5.55; copper 6.19; iron 20.1; elemental sulfur 48.3, solution co. holds the following components: nickel 14.7J copper 2.54 iron 25.9J iron residues,%: nickel 1.3; copper 0.86; sulfur is elemental 7.2,. The degree of decomposition of pyrrhotite is 95%. A total of 87.3% of sulphides are decomposed. Removing the solution,%: Nickel-34,2; copper 9.5; sulfur transfer to the elemental form 57.2%, Example 3, 2400 g of pyrrhotite concentrate of the following composition,%: nickel 4.58; copper 3.98; iron 49.1; sulfur 29.9 is suspended in 2400 ml of water, 40 ml of concentrated sulfuric acid and 2.4 g of dextrin dissolved in water are added, - Leaching is carried out at 130135 ° C and 3 atPO. After 6O minutes the pulp is cooled, 1060 g of sulfuric granules with a grain size of 2-5 mm,%: nickel 7.1; copper 7.6; iron 26,4i

elemental sulfur 30.0. The solution contains, g / l: nickel 10.5j copper 9.8 iron 31.2 solid iron residue,%: nickel 0.37; copper 0.17; elemental sulfur. The degree of decomposition of pyrrhotite 90% recovery in solution: nickel 20%; copper 20; sulfur transfer to elemental 48.5% of sulfur concentrate; In total, 64.3% of sulfides were decomposed.

Example 4 “700 g of pyrrhotite concentrate composition,%: copper 0.38J nickel 2.22, iron 52.25, sulfur 31.7 sprinkled into 700 mp of water, adding 13 ml of concentrated sulfuric acid, 700 mg dissolved in water sulphite liquor o Leaching at 160 ° C and oxygen partial pressure of 3.0 atm is continued for 40 min. After cooling the pulp on a 0.15 mm sieve, 135 g of granules with a particle size of 1 mm are extracted, the composition,%: copper, 0.58; nickel i, 2; iron 3, elemental sulfur 82.9o The solution of the pulp contains, g / l: nickel 14.07, copper 1.81, iron 34, Sj solid ferrous residue,%: nickel 0.26j copper 0.037J sulfur elemental l, 6i iron 51 , 0, The degree of decomposition of pyrrhotite is 98%., Total decomposed. 96.5% sulphides, extract ;; - not to solution: nickel 70%, copper 50%, sulfur transfer to elemental form 74%

PRI me R 5 o Weights of 100 g of copper concentrate from separation

fainteyn composition,%: copper 67.6} nickel 4.25, iron 4.6; cobalt 0.4 and sulfur 21.6 are extruded in 1000 mp of water containing 150 g / l of sulfuric acid at 5 atm POj, and other conditions given in Table 2

As can be seen from the data of Table 2, implantation with surfactant (sulfite liquor) gives the best results: in 4

times compared with the process at (experiment 1) the leaching rate increases; at the same time, the decomposition depth of sulfides does not decrease, as is observed at temperatures above the melting point of sulfur (cm 2).

Claims (1)

Invention Formula 1 "A method of processing sulfide polymetallic materials with the transfer of sulfur to elemental by discharging the water pulp of the crushed material under oxygen pressure at a temperature above the melting point of elemental sulfur, characterized in that, in order to intensify the process, alkalisation is carried out in the presence of surfactants of the polysaccharide class 2 o. The method of pop. 1, is different in that - Use sulfite liquor in the amount of 200-1500 g / t of source material. . Table 1 BY No additives 130 Same 135 Sulfite Lye 130-135 Dextrin 160 Sulfite Lye 92.0 1.0 98.0 0.7 Software 135-140 135-140 sulphite liquor table 2 86.0 6 98.0 2.0-6.0-69.5 42.0 3.0 97.8 86.0