Arsenic-antimony-cyanogen-containing mine wastewater treatment method

Abstract

The invention discloses an arsenic-antimony-cyanogen-containing mine wastewater treatment method. The method includes the steps of putting an arsenic and antimony removing agent and an oxidant in underground wastewater of a gold mine so that insoluble compounds produced through arsenic, antimony, lead, cadmium and other heavy metals in wastewater can be deposited and removed; continuing to add an oxidant so that insoluble compounds produced through the residual arsenic and antimony removing agent can be deposited, most of CN- can be removed and slag and water can be rapidly separated through the net capturing and adsorbing effect of flocculant (or 3# flocculant); putting a pH regulating agent and flocculant (or 3# flocculant) in forepart treatment water for coagulation to further remove heavy metals, fluorine and other pollution factors in wastewater and safely dispose water treatment sludge; conducting pH value regulation, oxidation, adsorption and other treatment on clear water so that the indexes of lead, cadmium, arsenic, antimony, COD and CN- in treated water can stably reach the limit stipulated by Integrated Wastewater Discharge Standard (GB 8978-1996 replacing GB 8978-88) and can reach the class-II water quality standard of environmental quality standards for surface water (GB3838-2002) and underground wastewater recycling can be achieved.

Description

technical field [0001] The invention relates to a mine wastewater treatment method, in particular to a gold mine mining wastewater treatment method. Background technique [0002] my country is a big gold producing country. The grade of gold in the ore is low. Generally, there are only a few grams to tens of grams of gold in a ton of ore. Gold is often associated with lead, antimony, and arsenic. In the process of gold mining, underground mining is usually required. Mining wastewater refers to the wastewater formed during the mining process. The underground mining wastewater mainly comes from the water and surface precipitation poured into or infiltrated into the mine from the aquifer, the wastewater produced by the mining process, and the surface precipitation. Underground wastewater usually contains suspended solids, lead , antimony, arsenic and other heavy metal ions. [0003] For a long time, gold extraction from ores often adopts cyanidation gold extraction process, such ...

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Problems solved by technology

[0008] With the continuous development of my country's national economy, many gold mines have entered the western region for gold mining. The western region is ecologically fragile and environmentally sensitive. With the gradual strengthening of the country's environmental protection requirements, the state and local governments have set regulations on the discharge of wastewater in these environmentally sensitive areas. More stringent discharge requirements, so the conventional chemical precipitation method is used to treat underground wastewater, and the water quality of the treated water is difficult to meet the requirements stipulated by the local environmental protection department (such as "Surface Water Environmental Quality Standards" (GB3838-2002) Class II water quality standards), so the development Downhole wastewater treatment processes and methods with pertinence, applicability, good treatment effect and low treatment cost are important measures to improve water resource utilization efficiency, save water resources and protect the environment

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