Method for recycling gold from cyaniding tailings through grading and shunting flotation

Abstract

The invention relates to a method for recycling gold from cyaniding tailings through grading and shunting flotation, which comprises the following steps: grading the cyaniding tailings by using a screen to divide the cyaniding tailings into a coarse product and a fine product, and preparing for grading and shunting flotation; selecting targeted process parameters and reagent systems for flotationof the coarse and fine fraction products; and selecting proper coarse fraction flotation middlings as carriers for fine fraction flotation, so as to improve the recovery efficiency of fine fraction tothe maximum extent. Finally, the comprehensive recovery rate of gold is integrally improved through coarse and fine particle grading and shunting flotation, series flow-carrier flotation, combined reagent enhanced flotation and the like. The method is advanced in process, good in separation effect and capable of effectively recycling the gold with the micro-fine particle size fraction in the cyaniding tailings. The Au grade of the final gold concentrate is larger than or equal to 16.03g / t, and the Au recycling rate is larger than or equal to 76.81%. The comprehensive resource utilization rateof the cyaniding tailings is increased, and economic benefits are brought to enterprises.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for recovering gold by fractional flow flotation of cyanide tailings, and is particularly suitable for resource recovery of gold in cyanide tailings with uneven particle size distribution. Background technique [0002] Cyanide gold extraction method is an important technology for gold extraction in gold mines. During the process of cyanide gold extraction, a large amount of cyanide tailings will be produced, and the gold grade in the tailings can reach 1-8g / t. Traditionally, the treatment of cyanide tailings is mainly landfill, which wastes resources and pollutes the environment. At present, some mines use the flotation method to recover gold and silver. There are two main methods: one is through the cyanide tailings Carry out full-grain flotation to obtain flotation gold concentrate, and then go through two steps of cyanidation leaching and deposi...

AI Technical Summary

Problems solved by technology

Traditionally, the treatment of cyanide tailings is mainly landfill, which wastes resources and pollutes the environment. At present, some mines use the flotation method to recover gold and silver. There are two main methods: one is through the cyanide tailings Carry out full-grain flotation to obtain flotation gold concentrate, and then go through two steps of cyanidation leaching and deposition extraction to obtain gold; the other is to enrich gold and silver to non-ferrous metals (such as copper, lead, etc.) through flotation In the concentrate, after pyro-smelting, gold, silver, copper and lead metals are obtained

[0003] Due to the high proportion of fine particles in cyanide tailings (-0.074mm content generally accounts for more than 80%), the silicate mineral mud is serious, and the pH value of the zero-electric point of various minerals is different. In the same slurry environment, the surface is charged The particles interfere with each other and affect each other, the non-selective adsorption of flotation reagents increases, and the viscosity of the pulp increases during the flotation process; the surface of valuable minerals adsorbs other ions to form an electric double layer, and a thicker hydration film will also appear on the surface. The flotation agent has a weak ability to collect it; the properties of different particle sizes vary greatly, and the coarse and fine particles are mixed with each other during the flotation process, and the useful minerals and gangue minerals interact with each other; The properties have changed significantly, and even many gold-encapsulated minerals are inhibited by cyanide and are difficult to float. The above reasons will greatly reduce the floatability of gold minerals in cyanide tailings, and recovery becomes very difficult.

[0004] The existing patent "Method for recovering gold from cyanide tailings" (Patent No. 2017112413846) includes the steps of raw ore pretreatment, roughing operation, sweeping operation, and beneficiation operation. The patent uses combined collectors Y-89 and YP -35, adding combined inhibitor sodium silicate and Linx385 at the same time, the flotation effect on gold wrapped in sulfide ore is good, but it does not grasp the characteristic that different particle sizes have different properties, and it is difficult to use the whole particle size flotation method. Guarantee the recovery effect of valuable minerals in cyanidation tailings with large interaction between coarse and fine particle size flotation or serious sludge

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