Method for treating cupric oxide or zinc oxide ores by adopting agitation ammonia leaching and infiltration basin ammonia leaching in combination

Abstract

The invention discloses a method for treating cupric oxide or zinc oxide ores by adopting agitation ammonia leaching and infiltration basin ammonia leaching in combination. The method is realized through the following steps: firstly fine crushing raw ores, and then dividing the materials into stream ores and fine ore pulp by adopting the combination screening method, wherein the stream ores undertake infiltration basin ammonia leaching by a thick ammonia leaching solution under the conditions of normal temperature, normal pressure and airtightness, and the fine ore pulp undertakes the first stage of agitation ammonia leaching by a mediate ammonia leaching solution under the conditions of normal temperature, normal pressure and airtightness; the fine ores and the stream ores after preliminary leaching undertake wet-type grinding and grading by a mediate ammonia leaching solution; and finally, the fine ore pulp undertakes the second stage of agitation ammonia leaching under the conditions of normal temperature, normal pressure and airtightness. The method has the advantages of improving the leaching efficiency of copper or zinc, reducing the solid-liquid separation ore amount of the fine ores, reducing the volatilization loss during repeated use of ammonia and improving the industrial health conditions; and further, the process has certain flexibility, so that the energy consumption for ore grinding is saved.

Description

Technical field [0001] The invention relates to a method for leaching materials with ammonia, in particular to a combined method of stirring ammonia leaching and ammonia leaching in a percolation tank, which is used for processing refractory copper oxide ore or zinc oxide with high alkaline gangue Ore belongs to the field of mineral processing technology. Background technique [0002] For the refractory copper oxide ores and zinc oxide ores with high alkaline gangue, if they are processed by flotation, they will be interfered by the sludge, which will make the reagent consumption large and the recovery rate low; if they are processed by acid leaching, it is because of acid To react with alkaline gangue, the acid consumption is too high, which is not economical; and the normal temperature and pressure ammonia leaching method has good leaching selectivity, the gangue does not consume chemicals, and the leaching solution has few impurities. [0003] For refractory copper oxide ore wi...

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Problems solved by technology

[0008] According to the existing wet grinding method, the wet grinding system and the slurry blending system are integrated. If the ammonia is not steamed back to the liquid, and the system is to avoid water expansion and cause the loss of ammonia to the outside, it must be suitable The concentrated ammonia immersion solution required for leaching is added to the wet grinding system, but the wet grinding equipment and spiral classifying equipment of this system are difficult to seal, and the ammonia will be volatilized and lost; the wet grinding also makes the pulp heat up, which intensifies the ammonia Volatile

In this way, not only more ammonia needs to be added before leaching, which increases the production cost, but also the volatilized irritating ammonia smell also deteriorates the industrial hygiene conditions of the production workshop

The way to improve is to cover the grinding and grading equipment, and then set up another fan to pump the tail gas to the absorption tower, but the absorption efficiency of ammonia is not high after it is diluted by air

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