Acid heap leaching process for cupric oxide ore

Abstract

The invention provides a new technique of acid heap leaching of copper oxide ore. The copper oxide ore is crushed and screened, then materials on a screen are carried out conventional acid heap leaching operation and the materials under the screen carry out concentration, size mixing and granulation and then are piled and leached; and leachate rich in copper ions is treated by the procedures of extraction, electrodeposition and the like so as to obtain cathode copper sold on the market. After the materials under the screen are concentrated, a binding agent needs to be added for size mixing; after size mixing, ore pulp and prepared acid-proof gravel with the granularity of 5mm to 25mm are mixed for granulation; in the granulation and heap leaching process, the pile height is 3 to 5m, in the heap leaching process, the concentration of dilute sulphuric acid is 0.1 to 2mol/L, the spraying strength is 0.2 to 0.5L/(min.m<2>) and the leaching period is 1 to 2 months. The technique can fully utilize copper oxide ore resource which is hard to be utilized in the past time, contains a large amount of clay mineral and is easy to argillization, improves the level of comprehensive utilization of mines, saves cost and increases profit. The invention is particularly suitable for being applied to the development of copper ore resources, mainly the copper oxide ore, which are hard to treat in all regions of China, in particular to remote regions of the western highlands.

Description

technical field [0001] The invention relates to a new process of heap leaching of copper oxide ore by acid method, especially the use of crushed stone carrier to granulate, improve the permeability of ore, and accelerate the leaching rate of copper oxide ore. New technology for efficient copper extraction. Background technique [0002] Copper oxide ore is an important copper mineral, and its deposits are mostly formed by geological epigenesis. The material composition and structure of various copper oxide ores are different, but they all have common characteristics such as strong hydrophilicity, large mud content, strong solubility, and flotation. [0003] The main methods of processing copper oxide ore are: flotation and leaching. For copper oxide ore with large mud content and easy mudification, the recovery rate of traditional sulfidation flotation is low, and it is difficult to solve the problem of mud interference; stirring leaching method has the advantages of short ...

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Problems solved by technology

For copper oxide ore with large mud content and easy mudification, the recovery rate of traditional sulfidation flotation is low, and it is difficult to solve the problem of mud interference; stirring leaching method has the advantages of short leaching cycle and high copper leaching rate, but has the disadvantages of high production cost, Defects such as difficult solid-liquid separation; conventional heap leaching methods have disadvantages such as poor permeability, low leaching rate and long leaching cycle

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