Method for extracting copper from chrysocolla type copper oxide ores through wet process

Abstract

The invention relates to a method for extracting copper from chrysocolla type copper oxide ores through a wet process, and belongs to the field of non-ferrous metal hydrometallurgy. The method comprises the following technological steps: 1) curing ores by adding sulfuric acid and performing desiliconization; 2) performing heaping and dipping to leach copper; 3) precipitating silicon in leaching feed liquid by utilizing ox glue; and 4) continuously inhibiting the volume of interphase dirt by selecting an organic phase component and a controlled phase. According to the method disclosed by the invention, after the chrysocolla type copper oxide ores are subjected to acid mixing, curing and desiliconization and the silicon of the leaching copper-containing feed liquid is precipitated by using the ox glue, the situation that the copper-containing feed liquid SiO2 is less than 500mg/L can be maintained, an extraction requirement is met, and the leaching time of the ores can be shortened; an extracting agent adopts M5640 and a diluent adopts SX-80, and extraction and back extraction are continuously carried out by adopting an organic phase, so that the emulsification volume and the compression volume of the interphase dirt can be reduced, and therefore, the chrysocolla type copper oxide ores can realize industrial application.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and in particular relates to a method for extracting copper from chrysocolla-type copper oxide ore by wet method. Background technique [0002] Copper in copper oxide ore is represented by malachite {Cu 2 (OH) 2 CO 3}, Chrysocolla {CuSiO 3 .2H 2 O}, azurite {Cu 3 (OH) 2 (CO 3 ) 2}, Copperite (CuO), Cuprite (Cu 2 O) and natural copper (Cu) and other forms exist. According to the different geological conditions of formation, the occurrence forms of copper in copper oxide ores are significantly different. [0003] If the content of chrysocolla in the ore is high, when the copper is extracted by leaching-extraction-electrowinning process, when the copper in the chrysocolla is dissolved, the silicon dioxide combined with it is dissolved in the form of silicic acid. During liquid extraction, the silicic acid in the feed liquid forms a large amount of interphase dirt, which...

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Problems solved by technology

[0003] If the content of chrysocolla in the ore is high, when the copper is extracted by leaching-extraction-electrowinning process, when the copper in the chrysocolla is dissolved, the silicon dioxide combined with it is dissolved in the form of silicic acid. During liquid extraction, the silicic acid in the feed liquid forms a large amount of interphase dirt, which exists between the organic phase and the water phase in the clarification chamber. The higher the chrysocolla content in the ore, the higher the silicic acid content in the leaching feed liquid. The more dirt between phases is produced, the more dirt between phases will cause: (1) phase entrainment caused by difficulties in extraction and back extraction phase separation, the extraction production is in chaos, and in severe cases, production is stopped; (2) silicic acid enters the copper-rich liquid, The quality of cathode copper products is affected during electrowinning; (3) The amount of dirt to be treated between phases is large, the consumption of organic phase is large, and the production cost is high

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