Treatment method for copper-containing gold ore cyaniding waste water

Abstract

The invention relates to a treatment method for copper-containing gold ore cyaniding waste water. The treatment method comprises the following steps under the following conditions: pH value adjustment: adjusting the pH value of the cyaniding waste water to 8.0 to 11.5; cyanogen removal in an INCO method (sulfur dioxide-air oxidation method): adding sodium sulfite into the cyaniding waste water with pH value well adjusted, uniformly mixing, mixing air and the cyaniding mixed solution, and monitoring the value by using a DO or ORP monitor; solid-liquid separation: performing solid-liquid separation for the waste water reaching a set value by adopting a coagulating sedimentation method, and separating a precipitate product dominant on copper hydroxide and supernatant; oxidation strengthening: adding an oxidant into the supernatant, and carrying out ultrasonic strengthening and induced oxidization; and catalytic oxidation: performing active carbon physical and chemical reactions for the ultrasonically-strengthened solution to obtain pure water and gold-loaded carbon. The method has the advantages that technological advantages are complementary and unified, the reaction is relatively easy to control, the hydraulic impact load resistant capability is high, the pH value of water is not required to be maintained, the operation is simple, the power consumption is small, the consumption of the oxidant and the expense of chemicals are low, the purified water quality is good, the recovery rate of valuable metals is high, and the like; and the method is suitable for treating the copper-containing gold ore cyaniding waste water.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating copper-containing gold ore cyanidation wastewater, which is suitable for the treatment of copper-containing gold ore cyanide wastewater. Background technique [0002] With the increase of gold demand in our country and the continuous depletion of gold-bearing mineral resources, copper-bearing gold ore, as a typical refractory ore, has gradually become the main mining object. The cyanidation method is the most economical and convenient method for extracting gold from ores, concentrates and tailings. It has the advantages of low cost, good stability, strong ability to dissolve gold and wide adaptability to ore types. , is the main gold extraction method in the current industrial production of rock gold mines in my country. Processes such as heap leaching, carbon leaching, carbon slurry, pressure leaching, bacterial leaching, and fluidized bed roas...

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Problems solved by technology

[0003] At present, domestic treatment of this type of wastewater is mainly based on the method of destroying cyanide, such as natural degradation method, bleaching powder / hydrogen peroxide method, inco method, ozone oxidation method and electrolytic oxidation method, etc., but there are deficiencies in some aspects, such as The bleaching powder oxidation method requires a large amount of sediment to occupy the tailings storage capacity, the valuable metal copper in the slag is low in grade and cannot be recovered, and the operating environment of the workers is poor, and the residual chlorine in the water is high (causing death threats to aquatic organisms when discharged), due to scientific and legal reactions End point control is imprecise, and the air excess coefficient of gas-liquid mixing is large. If the gas-liquid ratio is greater than 20, the residence time is about 30 minutes long and the water quality after treatment cannot meet the national discharge standards stably. Hydrogen peroxide oxidation, ozone oxidation and electrolytic oxidation all exist High operating or investment costs, etc.

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