Method for treating cyanide-containing waste water produced by gold industry by using diatomite/ titanium dioxide composite material

Abstract

The invention relates to a method for treating cyanide-containing waste water produced by gold industry by using a diatomite / titanium dioxide composite material, belonging to the technical field of waste water treatment. The method comprises the following steps: mixing butyl titanate and absolute ethyl alcohol, evenly stirring, then adding deionized water into the mixture, and continuously stirring until light yellow transparent sol is formed; adding diatomite into the light yellow transparent sol, stirring, standing still and drying to obtain dried gel; roasting the dried gel to obtain the diatomite / titanium dioxide composite material; adding the cyanide-containing waste water into the diatomite / titanium dioxide composite material, oscillating and then irradiating by a high-pressure mercury lamp; filtering to obtain a filter cake and filtrate, analyzing the concentrations of cyanogen and copper in the filtrate, and washing the filter cake. The method is simple in operation, is capable of decomposing heavy metal ions and cyanogen while treating the cyanide-containing waste water, and is high in metal adsorbing capacity and cyanogen decomposition amount.

Description

technical field [0001] The invention relates to a method for treating cyanide-containing wastewater in the gold industry with a diatomite / titanium dioxide composite material, and belongs to the technical field of wastewater treatment. Background technique [0002] Shandong Province is one of the most important gold production bases in my country. It is rich in gold resources and its gold production accounts for a quarter of the country. Gold extraction by cyanide leaching method is an economical and effective method. Although the process uses highly toxic cyanide, there is no other process in the industry that can replace it. The mine needs to be discharged 4m 3 About cyanide wastewater, in which the concentration of cyanide is 10-100mg / L, some are even higher, and it also contains heavy metals such as copper, zinc and iron, which form heavy metal complexes with cyanide and become harmful pollutants. These cyanide wastewater containing heavy metals seriously exceed the cya...

AI Technical Summary

Problems solved by technology

The disadvantages of the alkaline chlorine oxidation method are: the atmosphere escaping from the operation room is strongly irritating to the workers, and a large amount of lime is used, the operating environment is poor, the secondary pollution of the chlorine oxidation method is serious, and chlorine leakage often occurs. The control is difficult, the air consumption is large, the water salinization is relatively serious, and the cost is relatively high. It is a purely consumable sewage treatment method.

However, the sulfur dioxide oxidation ability is weak, so its consumption is also large, and this method should not be used when the source of sulfur dioxide is difficult.

Although the hydrogen peroxide oxidation method has a good treatment effect, hydrogen peroxide is a strong oxidant, which is highly corrosive, difficult to transport, high in price, and few manufacturers, so it is difficult to popularize and apply at present

The acidification method can maximize the recovery of cyanide, and it is also a technology commonly used in factories at present. However, this method requires a closed system, there is a danger of hydrogen cyanide overflow, the operation is complicated, and the cyanide-containing residual liquid after one-time treatment cannot reach the national level. Emission standards increase economic and technical difficulties for secondary treatment

The one-time investment is too large, which is difficult for small and medium-sized enterprises to afford

The effect of the ion exchange method is good, but the cost of raw materials is high, the operating cost is high, and there is a shortage of producing a large amount of secondary wastewater, so it is difficult to popularize and utilize

Membrane technology has great potential in the field of wastewater recycling, but its pretreatment process is complicated, and there is membrane fouling and high operating costs, making it difficult to apply in this field

Solvent extraction method is a process developed by Tsinghua University in a gold refinery in Shandong in the late 1990s to treat high-quality concentrated cyanide waste liquid. The extraction agent in this method is expensive and costly, and has no industrial application in the end.

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