Enhanced leaching method for copper ore

Abstract

The invention discloses an enhanced leaching method for copper ore, and relates to the field of hydrometallurgy. In the leaching process of complex copper ore containing sulfur, arsenic and combined copper, a composite catalytic oxidizing agent and an activating agent with super-strong oxidizing capacity are added, and the copper ore is leached in cooperation with acid leaching agent dilute sulphuric acid or alkaline leaching agent ammonia water, ammonium salt and the like. Due to the enhanced oxidation effect of the catalytic oxidizing agent and the activating agent, arsenic-sulfur minerals can be subjected to an oxidation reaction at high temperature and high pressure under normal temperature and normal pressure, so that the refractory copper ore is oxidized and leached. Therefore, the leaching rate is improved, and better economic benefits are obtained.

Description

technical field [0001] The invention belongs to the field of metal hydrometallurgy and relates to an enhanced leaching method for copper ore. Background technique [0002] Copper is a typical chalcophilic element, which mainly forms sulfide minerals in nature, only forms oxides under strong oxidizing conditions, and can form natural copper under reducing conditions. At present, more than 250 kinds of copper minerals and copper-containing minerals have been found on the earth's crust, mainly sulfides and similar compounds, copper oxides, natural copper, and copper sulfates, carbonates, and silicates. and other minerals. Among them, there are 16 kinds that can be used as industrial mineral raw materials suitable for the current dressing and smelting conditions. [0003] At present, the raw materials of copper mineral dressing and smelting in my country are mainly chalcopyrite, chalcocite, bornite, malachite and so on. According to the technical conditions of dressing and sm...

AI Technical Summary

Problems solved by technology

[0009] 2) The structure of the ore is complex, with uneven particle size distribution, and most of them are ores with uneven disseminated particle size, and there are even many mineral combinations, fine structure distribution, complex composition, and many refractory ores

[0010] 3) The chemical composition of the ore is diverse, and various harmful components are associated and symbiotic, and the conditions of the dressing and smelting process are complex

Due to the volatility of arsenic and its compounds, it is extremely difficult or practically impossible to treat this kind of ore with the existing fire method, so the microbial leaching method has its development prospects. The disadvantage is that the leaching cycle is long and the recovery rate is not high. Generally can only reach 60% ~ 70%

[0014] 3) Alkaline leaching method: Alkaline leaching mainly includes ammonia water and ammonium salt leaching methods. Ammonia leaching has a wide range of applications because it is not affected by the properties of gangue minerals and has a good leaching effect on alkaline gangue copper minerals. It is also suitable for the leaching of iron-containing gangue minerals and siliceous gangue minerals with a lot of muddy copper ore, but the leaching rate is much lower than that of acid leaching, generally only reaching 50% to 60%.

[0015] 4) Sulfurization flotation method: Sulfurization flotation process is an effective method for combining chemical methods and beneficiation flotation processes to treat copper oxide ore, but for copper oxide ore with different properties, the effect varies widely, and sometimes the recovery rate is extremely low and cannot be applied

Copper resources such as sulfide mixed ore, low-grade copper sulfide ore, and copper-bearing waste rock cannot be economically processed and recovered by traditional dressing and smelting processes