A kind of efficient and harmless treatment method of mine copper cyanide wastewater

Abstract

The invention discloses a method for efficient and harmless treatment of copper cyanide wastewater in mines, comprising the following steps: step 1, preparation of modified straw ash: adding straw ash to deionized water and ultrasonically dispersing for 30-40 minutes, and the ultrasonic power is 300-40 minutes 400W, then add ferric chloride and aluminum chloride in turn and continue to stir for 20-30min. The modified straw ash used in the present invention is treated with raw materials such as ferric chloride and aluminum chloride, then compounded with modified bentonite, and finally through the establishment of a blending system. The use of straw ash has the potential of resource reuse. The effect is in line with the concept of environmental protection. The modification of bentonite is poured with a modified liquid. The modified liquid can form a pore structure in the bentonite, so that the straw ash enters the bentonite, and finally seals the pores with the microsphere emulsion to prepare the material. Has a strong specific adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of copper-cyanide wastewater treatment, in particular to an efficient and harmless treatment method for copper-cyanide wastewater in mines. Background technique [0002] Cyanide gold extraction has a history of hundreds of years, and there is no suitable gold leaching solvent that can replace it so far. Therefore, the cyanide gold extraction process will still dominate the field of gold production in the next few decades. With the rapid development of the gold industry, simple and easy-to-handle gold ore resources are becoming less and less, and copper-containing refractory gold ore resources have become one of the main raw materials for gold production. However, when copper-bearing gold mines are treated with cyanidation gold extraction process, a large amount of low-concentration copper-cyanide wastewater containing total copper and total cyanide concentration of 70-150mg / L will be produced. , will inevit...

AI Technical Summary

Problems solved by technology

However, when copper-bearing gold mines are treated by cyanidation gold extraction process, a large amount of copper-cyanide wastewater with a total copper and total cyanide concentration of 70-150mg / L will be produced. If the wastewater is not treated properly or directly discharged , will inevitably pollute the environment, especially water resources, and cause serious harm to human health, animals and plants, and the entire ecosystem

[0003] Although the existing copper-cyanide wastewater treatment can play a treatment effect, the treatment efficiency is not high, and the treatment effect cannot be effectively achieved. Chinese patent document CN106219807B discloses a comprehensive treatment method for low-concentration copper-cyanide wastewater in mines. The operation steps and The process parameters are as follows: The first step, the first stage of cyanide and copper removal: send the low-concentration copper-cyanide wastewater from the mine into the primary reaction tank with mechanical agitation, and add copper-sulfur compound slag removal to the primary reaction tank at the same time. The cyanide agent A carries out the first-stage cyanide and copper removal reaction, and the reaction time is 90-180 minutes. During the reaction, the pH value of the solution is controlled to be 9-10. After the reaction, the first-stage cyanide and copper removal slurry 1 is obtained, and it is reacted Add polyacrylamide flocculant at the slurry outlet of the tank; the second step, stage I solid-liquid separation: after adding polyacrylamide flocculant, the slurry 1 of stage I decyanide and copper flows to the thickener 1 for stage I thickening Subsidence, the dense subsidence flow of section I and the dense subsidence overflow of section I are obtained. Although this patent document can treat copper cyanide wastewater, the treatment effect of different technical solutions still needs to be further improved.