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Fast and effective treatment method for acid waste water from nonferrous metal mines

A technology for effective treatment of acidic wastewater from mines. It is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of large floor space, waste of resources and large investment costs , to achieve the effect of reducing the amount of construction, shortening the construction period, and reducing project investment and operating costs

Inactive Publication Date: 2015-09-09
CHANGCHUN GOLD RES INST
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Problems solved by technology

In the process of mine application, these methods only focus on the treatment of mine acid wastewater, and do not take into account the resource utilization of acid wastewater, resulting in many disadvantages such as huge investment costs, expensive operation costs, large floor space, and serious waste of resources. factor

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  • Fast and effective treatment method for acid waste water from nonferrous metal mines

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[0028] Acidic wastewater from a non-ferrous metal mine, pH 2.6, Cu 263.51mg / L, Fe 1235.47mg / L, Zn 4.52mg / L, Ni 6.64mg / L, As 2.12mg / L, SO 4 2- It is 15360.43mg / L, and also contains trace amounts of other heavy metal ions. Take 5L of waste water and place it in the stirring tank, start the stirring, add lime milk with a mass concentration of 10% to adjust the pH of the waste water to 3.5-4.0, react for 20 minutes, and then pass the slag-water mixture into the vulcanization reaction stirring tank, Add 25 mL of sodium sulfide solution with a mass concentration of 10% and stir for 30 minutes, then add milk of lime with a mass concentration of 10% for neutralization reaction for 30 minutes, adjust the pH to 8.0, and neutralize the neutralized slag after neutralization by 1.2% by mass The percent is mixed with the raw ore, put into the grinding machine to grind the ore, and then the flotation test is carried out. The neutralization liquid after neutralization treatment is all used f...

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Abstract

The invention discloses a fast and effective treatment method for acid waste water from nonferrous metal mines. The method mainly comprises four steps of iron precipitation reaction, solid-liquid separation, sulfidizing and neutralizing treatment, to be specific, firstly, carrying out iron precipitation on acid waste water by adding an alkaline reagent or phosphate, sulfide or other chemicals, adding a sulfurizing reagent or a heavy metal chelating agent, so as to enable copper ions or other heavy metal ions in the waste water to generate precipitates, adding an alkaline reagent for neutralizing treatment, and using the treated liquid and treated slag after neutralizing treatment in the mineral processing process according to a certain ratio. According to the characteristics that water quantity of acid waste water from the nonferrous metal mines is large, the water quality is complex and the quantity of slag generated by treatment is large, the acid waste water is treated steps by steps and then returned to the mineral processing process, and the effects of not influencing mineral processing production indexes and even improving the mineral processing production indexes are realized, so that zero emission of the acid waste water and zero storage of slag are realized, the construction period of a project is shortened, construction quantity of the project is reduced, and the construction investment and running cost are reduced.

Description

technical field [0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for treating acidic wastewater from nonferrous metal mines. Background technique [0002] Most non-ferrous metal mines are polymetallic mines, and the ores contain valuable elements such as copper, lead, zinc, gold, silver, molybdenum, etc. These metal elements are mainly secondary sulfide ores. The joint action of water, bacteria and bacteria forms sulfuric acid and metal sulfate, and dissolves various metal ions in the ore, thus forming acid wastewater containing copper, iron, zinc, manganese, arsenic, etc. In particular, some metal mines only have flotation operations without electrolysis and heap leaching operations. The mines are located in high-altitude areas such as the Qinghai-Tibet Plateau and the Yunnan-Guizhou Plateau. The ecosystem is fragile and it is easier to form acidic wastewater containing a large amount of sul...

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
Inventor 李哲浩刘强龙振坤吴铃王莹孟凡钰高飞翔
Owner CHANGCHUN GOLD RES INST
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