SU629890A3 - Method of hydrometallurgical reprocessing of copper sulfide concent rates - Google Patents

Description

The method is implemented because the sulfate ion is formed during the alkalization process itself. Preferably, a mixture of hydrochloric and sulfuric acids is introduced into the extensible solution so that the molar ratio of hydrogen ions to copper is (O, 15-0, 65): 1. At the same time, the acidity of the initial solution does not significantly affect the rate of leaching; during the latter, the pH value of the pulp (pH) is in the range 2.5-4.0 and remains at this level until the end of the process due to hydrolysis of copper sulfate to form its basic sulfate. The developed method is applicable to the processing of any copper concentrates, but is most effective for the chaloshfit. The leach solution can be recycled. The use of other halogens instead of chloro or bromion turned out to be irrational. When using iodine, the degree of conversion of the copper concentrate is too low; fluoride ion is highly aggressive. Example 1. A portion of ZOO g chalum ovog o concentrate containing 25.4% of C, leached in an autoclave with mechanical stirring (P 6OO rpm) at a pulp density

Table T: W 1: 3, temperature 145-175 С, oxygen pressure about 14 atm. The halogen ion is introduced in the form of hydrochloric acid, sodium chloride, potassium chloride, or ammonium chloride. The treatment is carried out for 2, 5 hours. The results of the experiments are given in table. 1. Example 2. The leaching is carried out under the conditions of example 1. As a leach solution, the filtrate from the previous experiment is used, maintaining a constant chlorine concentration (17 g / l HC) with hydrochloric acid additives. The pH value of the pulp in each experiment stabilizes at a level of 2.8-3.2. The results of the experiments are given in table. 2, There is no accumulation of copper and sulfa-in-ion in the solution; average sulfur recovery to elemental 78%, average degree of copper conversion 98, 2%. Example 3. Under the conditions of example 1, the concentrate of the composition is expressed in excess of%, copper 28, 4; iron 26, .1, sulfur 30, 8. The leaching solution contains 16 g / l of sulfuric acid to 57 g / l of bromine. The effect of the bromine ion on the leaching rate is shown in Table 3. The use of bromine ion is more effective ™; the same degree of copper conversion in the bromine ion prune is almost 2 times faster than in the presence of chlorine ion.

Table 2

Table3