Method for recovering valuable elements in gold-silver-iron associated ore tailings

Abstract

The invention relates to a method for recovering valuable elements in gold-silver-iron associated ore tailings. The process technical route comprises the following steps that S1, ferromagnetic magnetite concentrate and gold-silver-loaded intergrowth with lower magnet content are recovered from the tailings by adopting medium magnetic separation; S2, the iron rough concentrate is finely ground until the content of-0.038 mm accounts for 90% or above; S3, a proper amount of lime milk is added for pulp mixing, the pulp concentration is controlled to be 30%-35%, the pulp pH value is 10-12, the cyanide concentration is 0.03%-0.07%, compressed air is input, the dissolved oxygen content in the pulp is controlled to be 15-20 mg / l, and the cyanidation leaching time is 28-30 hours; and S4, after a dispersing agent is added into the cyanidation leaching residues, strong magnetic iron minerals are recycled through low intensity magnetic separation, and magnetite concentrate is obtained. The low-intensity magnetic separation tailings are subjected to high-field-intensity and high-gradient high-intensity magnetic separation to recover low-intensity magnetic iron minerals, and high-intensity magnetic products are obtained; and the dispersing agent is prepared from water glass and sodium hexametaphosphate in a weight ratio of 1.6-3: 1. Aiming at the characteristics of tailings, the iron recovery rate is improved on the premise of ensuring the gold-silver recovery rate and the magnetite concentrate grade.

Description

technical field [0001] The invention relates to a method for recovering valuable elements in gold-silver-iron co-associated ore tailings, which belongs to the field of ore dressing and hydrometallurgy. Background technique [0002] Mineral dressing is the use of physical or chemical methods to separate useful minerals from useless or harmful minerals in mineral raw materials. The product enriched in useful components is called concentrate, and the product enriched in useless components is called tailings. The concentrate provided by ore dressing is mainly used for smelting Industry extracts raw materials for metals. Magnetic separation is carried out in the magnetic field of the magnetic separation equipment. After the ore to be selected enters the separation space of the magnetic separation equipment, it is affected by magnetic force and mechanical force (including gravity, centrifugal force, water flow force, etc.). Ore particles with different magnetic properties are af...

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Problems solved by technology

[0003] At present, the main technologies and existing problems of the comprehensive utilization of tailings resources in my country are: (1) Tailings re-selection, tailings re-selection generally has small scale, backward technology, low recovery rate, high energy consumption, high cost, and valuable The low comprehensive utilization rate of elements; (2) Tailings production of building materials, lack of original innovation, low product added value, small sales radius, does not show the comprehensive advantages of production cost, transportation cost and product quality, it is difficult to At the same time, valuable elements are not effectively recycled and reused, and the added value of products is low; (3) Tailings are used to make fertilizers, and the production of fertilizers from tailings only stops at the utilization of a small amount of tailings, and most tailings cannot be made into fertilizers. It is still unable to reduce the stockpiling of bulk tailings; (4) The tailings fill the mine goaf, and the valuable elements in the tailings have not been effectively and comprehensively recycled

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