Treatment method for deeply removing thallium and cadmium from smelting wastewater

Abstract

The invention discloses a treatment method for deeply removing thallium and cadmium from smelting wastewater. The treatment method comprises the following steps: S1, preparing a reagent A from 5-18% of sodium dimethyl dithiocarbamate, 5-15% of sodium tripolyphosphate and 1-5% of sodium sulfide nonahydrate; S2, preparing a reagent B from 20-45% of polyferric sulfate and 10-30% of polyaluminum chloride; S3, carrying out primary treatment: taking smelting pretreatment wastewater, adjusting the pH value of the wastewater to 8-11, adding an oxidant, then adding the reagent A, performing a reactionfor 10-20 min, finally adding the reagent B, performing a reaction for 5-15 min, and then carrying out filter pressing; and S4, carrying out secondary treatment: adjusting the pH value of the primarily filter-pressed solution to 7-10, adding the reagent A, performing a reaction, then adding the reagent B, performing a reaction, standing the obtained solution, and discharging the wastewater after the obtained supernatant is qualified. The method is scientific and reasonable, is safe and convenient to use, is suitable for various smelting pretreatment wastewaters, has wide applicability, and hasthe advantages of good treatment effect on wastewater with low content of thallium and cadmium, high pertinence, short process, simplicity in operation, and short reaction time.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for deep removal of thallium and cadmium from smelting wastewater. Background technique [0002] The problem of wastewater pollution is becoming more and more serious, and the country's requirements for environmental protection are getting higher and higher. The standard discharge of smelting wastewater can be said to be the top priority for smelting enterprises to survive. The treatment of wastewater has never stopped, but why is there still so much pollution? The main reasons are as follows: [0003] 1) The main pollution is removed, and a small amount or trace pollution still exists; [0004] 2) Mineral resources are gradually scarce, and ore or slag with many impurities and pollution sources enter the smelting system, resulting in increased difficulty in wastewater treatment; [0005] 3) The update speed of wastewater treatment technology is...

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Problems solved by technology

[0009] The present invention provides a treatment method for the deep removal of thallium and cadmium from smelting wastewater, which can effectively solve the problems of the above-mentioned background technology. etc., mainly for the heavy metal sector in wastewater. According to relevant reports and the actual production data collection and statistics of many companies, the removal of heavy metals Pb, Zn, As, Cu, Sb, Hg, etc. is basically through the neutralization and vulcanization section. It can be treated up to the standard, but it is often difficult to treat cadmium and thallium to the standard through conventional processes. It is difficult to reduce it when it is about 2-10 times the qualified amount. Thallium troubles R&D technologists

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