Method for reusing beneficiation wastewater of lead-zinc oxide ore

Abstract

The invention relates to a method for reusing beneficiation wastewater of lead-zinc oxide ore. The method includes the steps that lead concentrate pulp obtained through lead flotation is subjected to the overflowing action in a concentrate pool, so that wastewater flows into a wastewater pool, an alkaline flocculating agent is added into the wastewater pool, the wastewater flows into a settling pond for flocculating settling, and liquid supernatant enters the next clean water basin and is returned through a pump to serve as lead flotation supplementary water; lead flotation tailings enter into the lead flotation working procedure; zinc concentrate pulp obtained through zinc flotation is subjected to the overflowing action in a concentrate pool, so that wastewater flows into a wastewater pool, an alkaline flocculating agent is added into the wastewater pool, the wastewater flows into a settling pond for flocculating settling, and liquid supernatant flows into the next clean water basin and is returned through a pump to serve as zinc flotation supplementary water; and zinc flotation tailings are led into a tailing pond, the alkaline flocculating agent is added for filtering after the stirring reaction is completed, and accordingly dry tailings can be obtained. The requirement of dry discharging treatment of the tailings is met, and filter liquor returns to serve as zinc scavenging supplementary water.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for reusing lead-zinc oxide ore dressing wastewater. Background technique [0002] In recent years, with the continuous mining of ore, the resources of high-grade lead-zinc sulfide ore are gradually depleted, the difficulty and risk of mining have increased, and various restrictions on ore mining have been imposed by new policies. Some enterprises have begun to deal with high-grade, easy-to-mine lead-zinc oxide ore . The treatment of lead-zinc oxide ore usually adopts vulcanization first - amine salt flotation method. The vulcanization process consumes a large amount of alkaline chemicals such as sulfide, carbon alkali and caustic alkali, accounting for more than half of the total cost of chemicals, which also leads to high cost of chemicals The main reason is that at the same time, the waste water discharged with the concentrate and the tail money contains a ...

AI Technical Summary

Problems solved by technology

The treatment of lead-zinc oxide ore usually adopts vulcanization first - amine salt flotation method. The vulcanization process consumes a large amount of alkaline chemicals such as sulfide, carbon alkali and caustic alkali, accounting for more than half of the total cost of chemicals, which also leads to high cost of chemicals The main reason is that at the same time, the waste water discharged along with the concentrate and the final payment contains a relatively high concentration of residual alkali, and the pH of the solution reaches about 11, resulting in a large waste

In addition, zinc oxide is an amphoteric compound, which will partially dissolve into the wastewater under alkaline conditions, resulting in a high concentration of heavy metal ions in the wastewater. If it is discharged outside, it will cause serious harm to the surrounding ecological environment. Therefore, it is necessary to choose an appropriate treatment method Treat mineral processing wastewater

[0003] 3. At present, coagulation sedimentation, oxidation, ion flotation, activated carbon adsorption, biological and other methods are commonly used to treat wastewater, but these methods cannot make full use of the residual chemicals in wastewater and wastewater reuse. Inorganic coagulants are added to the wastewater, and the colloids are destabilized and coalesced into large flocs to settle through the effects of adsorption bridging, net capture, and compression of the double layer. It has the advantages of simple process, convenient operation, and low operating costs. However, there are disadvantages such as a large amount of sludge and easy to cause secondary pollution; the oxidation method oxidizes organic flotation agents such as xanthate and black medicine through strong oxidants, thereby achieving the effect of removing pollutants, but the treatment cost is high, and it is difficult in Promoted in production practice; the ion flotation method utilizes the adsorption effect of the surfactant on the gas-liquid interface, so that the ions in the solution and the surface active substances form soluble complexes or insoluble precipitates, which are attached to the air bubbles and float up. Flotation separation, but flotation agents are expensive and easy to cause environmental pollution or increase purification facilities, etc.; activated carbon adsorption method uses activated carbon with a huge surface area to absorb heavy metal ions in wastewater, the treatment effect is good, but the treatment cost is high; biological method is through biological The interaction between organisms or their metabolites and metal ions achieves the purpose of purifying sewage, which has the advantages of good effect, low cost and no secondary pollution. However, organisms have strict requirements on the environment, and most organisms cannot survive in alkaline in an overly sexual environment

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