Efficient pretreatment method for refractory metallurgical ore

Abstract

The invention relates to an efficient pretreatment method of refractory metallurgical ore. The efficient pretreatment method comprises the steps that water is added into the refractory metallurgical ore for size mixing, a dispersing agent is added for mechanical activation, ore grinding is conducted till 90 percent by mass of particles are less than 1-20 microns, and the chemical reaction activity of the refractory metallurgical ore is increased; an oxidizing agent is added into the mechanically-activated system for pre-oxidation, associated mineral wrapping gold is dissolved to expose the gold, and filtering is conducted after pre-oxidation; and a filter cake obtained through filtering is subjected to size mixing, gold is extracted through leaching, and the gold and silver in the filter cake are recycled. According to the efficient pretreatment method, mechanical activation and chemical pre-oxidation are adopted, the difficulty of oxidation reaction of the wrapping mineral of the refractory gold ore is reduced, the oxidation reaction can be conducted at the normal temperature and under the normal pressure, and the equipment investment and the operation cost are reduced and meanwhile, harmful gas and waste residues are not generated, environment friendliness is achieved, large-scale manufacturing of equipment is easy, large-scale production and application can be achieved, and the efficient pretreatment method has great popularization value.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, relates to the smelting of gold and silver ores, in particular to a high-efficiency pretreatment method for refractory metallurgical ores. Background technique [0002] The gold in the refractory metallurgical ore is mostly wrapped in the accompanying minerals in the form of micron-scale fine particles. To recover this part of the gold, the package must be opened to expose the gold. [0003] There are three commonly used pretreatment processes: [0004] The first is autoclave oxidation. Under the condition of high temperature and high pressure, oxygen is filled to dissolve the associated minerals wrapped in gold and expose the gold. That is, the chemical reaction that is difficult to carry out under normal pressure is carried out under high temperature, high pressure, and aerobic conditions, and acid or alkali is added to decompose the sulfur and arsenic minerals wrapped in gold in the ore, s...

AI Technical Summary

Problems solved by technology

[0007] The pretreatment method has the following advantages: (1) The oxidation product is soluble, and the reaction decomposition is complete; (2) No harmful gas is produced, which is environmentally friendly; (3) Both raw ore and concentrate can be processed, and it is suitable for building a large-scale gold extraction plant Its disadvantages are: (1) due to high temperature and high pressure and often accompanied by strong corrosion, it has high requirements for equipment and materials, and there are potential safety hazards; (2) high operation and maintenance costs; (3) large investment

The disadvantages are: slow processing speed, long oxidation time, large amount of metal stock in the system leads to large capital occupation, large investment in equipment, low pulp concentration, anti-corrosion treatment for equipment, temperature resistance requirements for bacteria, poor adaptability, Weak raw material adaptability, etc.

Its disadvantage is: the roasting process releases a large amount of SO 2 and As 2 o 3 and other harmful gases, the pollution is relatively large; the environmental friendliness is poor, the process requirements are strict, and the pretreatment effect is poor; the process is long and complicated, the investment is large, the production cost is high, and the recovery rate of gold is lower than the previous two processes.

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