SU479811A1 - The method of hydrometallurgical processing of zinc-containing raw materials with high chlorine compounds - Google Patents

Description

the previous batch, the second repulpation - the third wash water of the previous batch, the third repulpation - condensation from the evaporation of the filtrate. The water from the first repulp is fed to the leaching of the feedstock. The resulting product contains almost no chlorine. Example 1. 600 g of batches are crushed in a laboratory ball mill, and zinc metal beads are sifted out, which are melted in a crucible of a muffle furnace. Fine fraction weighing 25 g, containing,%; 52.3 zinc; 20.5 chlorine; 4,812 ammonia, loaded into the reactor. 100 ml of water from the first repulp of the previous batch and 10 ml of an aqueous solution of ammonia of 25% concentration are poured there, and the total volume of the liquid phase is made up to 125 ml with water. The reaction mass is heated to 124 ° C under a pressure of 2 atm for 1.5 hours. The pulp is filtered on a Buchner funnel. The filtrate is evaporated, the resulting salt is obtained at a temperature of 130 + 5 ° C. The precipitate is subjected to repulping with the second washing water of the previous batch, then secondary repulping with the third washing water of the previous batch and third repulping with condensate from evaporation of the filtrate. Test data of the obtained product are given in the table. Example 2. Under the conditions of example 1, leached under a pressure of 1.5 ° C at a temperature of 118 ° C. The results are shown in the table. Example 3. Under the conditions of Example 1, leaching is carried out at an ammonia concentration of 18. The results are shown in the table. Example 4. Under the conditions of Example 1, the leaching is carried out at an ammonia concentration of 10 g / l. The results are shown in the table.

Sediment after dechlorination and drying

Claims (2)

1. A method for hydrometallurgical processing of zinc-containing raw materials with a high chlorine content, such as hot-dip galvanizing slags, including chopping slag, classifying the crushed product, leaching in the reactor, filtering the leaching slurry, drying the sediment and re-melting the zinc metal beads, so as to completely dechlorination of the processed raw material, salt is obtained from the filter In order to eliminate the consumption of reagents and eliminate the formation of wastewater, leaching is carried out with an aqueous solution of ammonia under a pressure of 1.5-2.5 bar and 118- (135 ° C. The resulting precipitate is repeatedly repulped with condensate obtained by evaporation of the leach filtrate. 2. A method according to claim 1, characterized in that the leaching is carried out in a dilute aqueous ammonia solution with a concentration of at least 10 g1 l, preferably 18 g / l, at a ratio of T: F 1: 10, preferably 1: 5.