CS197399B1 - Antimony chloridating deroasting from tetraedrite calcines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the chloridation deprotection of antimony from tetrahedronic esters which are cold treated with hydrochloric acid and, after reacting and drying, to degrade to antimony. The content of antimony is usually from 3 to 15 and an obstacle in the metallurgical processing of fryers into meS. Sir elaborated different methods of separating antimony from the medium, such as the antifungal chlorinating agents of the antimony, which consist in mixing the frying agents with seltium chloride, e.g. with NH 4 Cl and roasted at 600 to 700 ° C. Antimony, which is present here in the form of oxizluoroenines, is easily converted to chloride and fills like SbCl ^

It has been found that degassing of SbCl 2 can be carried out more economically and at a lower temperature, e.g. at 300 ° C, while concurrently biting the powdered tetrahedrates, if the halide oxidation of the antimony in the arsenic takes place in the cold mass under the effect of concentrated sulfuric acid j, which preferably dissolves the oxidation of antimony, the reaction is weakly exothermic atmospheric conditions and at the same time bite.

The disadvantages of the prior art do not have the method of the oxidative deposition of antimony from the tetrahedronic sticks according to the invention, which consists in that the powdered tetrahedron stents, preferably dry, are mixed with concentrated hydrochloric acid, preferably 35%, in an amount which is at least 50% higher than the stoichiometric antimony content of the scrubs, the mixture is allowed to react freely under atmospheric conditions and, after spontaneous drying or using heat, the dried mixture is fried at a temperature of 300 to 600 ° C for at least 30 minutes .

Advantageously, pelletizing 197 399 is simultaneously carried out when mixing the calcines with hydrochloric acid

197 399, or the pellet mixture is only after pre-drying, and the size of the pellets is controlled by the 3% addition of hydrochloric acid. The binder here is the water-soluble salts formed by HCl. If the antiman content is less than 6%, it is preferable to add concentrated salic acid directly to the pelletizer and to produce micropellets. freely, or using warm air. The amount of salt is added at least 50 $ more than the stoichiometric content of antimony in the arterial. The duration of acid exposure in the paraffin deposited in the form of pellets at an air temperature above 15 ° C is at least one. For evaporation of Sb, it is advantageous to use a dried mixture to remove residual aqueous HCl, since this will substantially reduce the corrosion of the condensation apparatus by the gases.

SUMMARY OF THE INVENTION The present invention is based on the treatment of tetrahedrite fumers with concentrated hydrochloric acid, which in the cold mixture before evaporation forms SbCl2, i.e. independently of the deprotection conditions.

By this procedure, it is possible to bite the threshold tetra-tetritic inlay, which favorably influences the flue gas exhaust as it starts at 300 ° C and is usually terminated after 1 hour of roasting. The total amount of offgasses is reduced because the flow of unreacted halogenating agent is avoided, as is the case with the use of halide salts.

The deprotection of SbCl2 from the mixture can be carried out in a rotary kiln, also in a multi-stage furnace independently of the composition of the peon atmosphere.

Example 1

The dry powdered tetrahedron copper plumes containing Cu of 19.20 $ and Sb 5.76% were mixed with concentrated hydrochloric acid (35 $) in a pelletizing bowl in an amount of 25 L per 100 kg of the flakes. The pellets were allowed to dry freely and their temperature rose to 55 ° C. After two days of standing, the pellets were already dried.

The deprotection of SbCl2 was carried out in a multi-stage oven with direct heating at a temperature of 300-550 ° C for 1 hour. The off-gases were passed through hot lime water, in which antimony was captured as SbOCl, respectively. calcium antimonite.

The composition of the Collections after detaching Sb was: 21.8 $ Cu and 0.56 $ Sb. The Sb content in the trapped condensate was 43 $.

Example 2

Dry copper tetraedrite dusts containing Cu of 22.8 $ and Sb 10.5 $ sp were mixed with HCl (35 $) in an amount of 35 L per 100 kg of the blend. The mixture was allowed to react for a day and then dried in a warm air. At a humidity of about 8 ° C, the pelletizing pans were prepared from the mixture in a pelletizing dish and dried after drying in a rotary oven at 450-500 ° C for 2 hours. The gases were treated as in Example 1.

The composition of the paraffin after removal of Sb was: 26.3 $ Cu and 1.3θ $ Sb The Sb content in the trapped condensate was 58 $.

Claims (2)

1. A process for the deoxidative deposition of antimony from tetraedrite frits, characterized in that the sintered tetraedrite frits, preferably dry, are mixed with concentrated concentrated hydrochloric acid, preferably 35 $, in an amount which is at least 50 $ greater than the stoichiometric antiman content. In a fryer, the mixture is allowed to react freely under atmospheric conditions and, after eamic drying or using heat, the dried mixture is freeze-dried at a temperature of 300 ° C for at least 3 ° minutes. 197 399 2. Method according to claim 1, characterized in that, when mixing the extracts with acid, the pelletizing process is carried out at the same time, or the mixture is pelletized only after pre-drying, the pellet size being controlled by a 3-fold addition of hydrochloric acid.