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Heavy metal collecting agent and thallium-removal method used for sintering desulfurization waste water

A heavy metal trapping agent and desulfurization wastewater technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of unstable removal efficiency, high treatment cost, long reaction time, etc., to achieve The effect of reducing the dosage of chemicals, good trapping effect and good removal effect

Active Publication Date: 2016-01-20
GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The treatment methods disclosed in the above inventions all need to add an oxidizing agent to the wastewater to ensure that the oxidation reaction is complete, so the reaction time is longer, and considering the influence of other reducing ions in the water body, a large amount of oxidizing agent needs to be added, resulting in low removal efficiency. Stable and expensive to process

Method used

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  • Heavy metal collecting agent and thallium-removal method used for sintering desulfurization waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Mix 15g of urea, 2g of diethylenetriamine, 0.4g of epichlorohydrin with water, control the reaction temperature at 25℃ and react for 1h, then add 2.5ml of carbon disulfide dropwise to keep the reaction temperature unchanged, continue stirring for 3h, and then heat up After reaching 55°C, the reaction was continued for 2 hours. After the temperature dropped to room temperature, 0.4 g of sodium dodecylbenzene sulfonate was added, and after stirring for 15 minutes, a new agent M1 was obtained.

[0029] The experimental wastewater was taken from the sintering desulfurization wastewater of a steel plant, the pH of the water sample was 6.8, and the thallium concentration was 0.898 mg / L. Take 500ml waste water adjusted to pH=9 by CaO, add 1.5gPAC, stir for 10min and then stand still, take 400ml supernatant, add 1.4gM1 and 0.2gPAM and continue stirring for 10min, take the supernatant and measure the thallium concentration after standing.

Embodiment 2

[0030] Example 2: Mix 15g of urea with 2g of diethylenetriamine, 0.4g of epichlorohydrin and water, control the reaction temperature at 25℃ and react for 1h, then add 2.5ml of carbon disulfide dropwise to keep the reaction temperature unchanged, continue stirring for 3h, and then heat up After reaching 55°C, the reaction was continued for 2 hours. After the temperature dropped to room temperature, 0.4 g of sodium dodecylbenzene sulfonate was added, and after stirring for 15 minutes, a new agent M1 was obtained.

[0031] The experimental wastewater was taken from the sintering desulfurization wastewater of a steel plant, the pH of the water sample was 6.8, and the thallium concentration was 0.898 mg / L. Take 500ml waste water adjusted by CaO to pH=9, add 1.8g PAC, stir for 10min and then stand still, take 400ml supernatant liquid and add 1.2gM1 and 0.3gPAM to continue stirring for 10min, take the supernatant liquid and measure the thallium concentration after standing.

Embodiment 3

[0032] Example 3: Mix 20g of urea, 3g of diethylenetriamine, 0.6g of epichlorohydrin with water, control the reaction temperature at 25℃ and react for 1h, then add 3ml of carbon disulfide dropwise to keep the reaction temperature unchanged, continue stirring for 3.5h, and then heat up After reaching 60°C, the reaction was continued for 2 hours. After the temperature was lowered to room temperature, 0.6 g of sodium dodecylbenzene sulfonate was added, and after stirring for 15 minutes, a new agent M2 was obtained.

[0033] The experimental wastewater was taken from the sintering desulfurization wastewater of a steel plant, the pH of the water sample was 6.8, and the thallium concentration was 0.898 mg / L. Take 500ml waste water adjusted to pH=9 by CaO, add 1.6gPAC, stir for 10min and then stand still, take 400ml supernatant and add new medicine 1gM2 and 0.2gPAM and continue to stir for 10min, take the supernatant and measure thallium concentration after standing.

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Abstract

The invention relates to a heavy metal collecting agent and a thallium-removal method used for sintering desulfurization waste water. The method is divided into two stages, wherein the first-stage treatment comprises the steps of adjusting the thallium-containing waste water to be alkaline, and adding coagulant; the second-stage treatment comprises the steps of adding agentia and coagulant to supernatant obtained after solid-liquid separation of the first-stage treatment, and effluent is drained outward directly after being subjected to press filtering. The agentia is prepared from, by weight, 20-30% of urea, 1-3% of linear chain small molecule amine substances, 4-9% of carbon disulfide, 0.4-0.7% of epoxy chloropropane, 0.5-0.8% of surfactant and the balance water. A preparation method comprises the steps of adding water for being mixed with urea, amine substances and epoxy chloropropane, stirring the mixture for a certain time at the room temperature, then dropwise adding carbon disulfide, continuing with the reaction, after a period of time passes, raising the temperature, continuing stirring, after the reaction is completed, lowering the temperature to the room temperature, adding surfactant, stirring the mixture uniformly, and obtaining the product. According to the heavy metal collecting agent and the thallium-removal method used for sintering the desulfurization waste water, the agentia is added to the thallium-containing waste water to be treated, and metal complex is formed after the mixture is stirred sufficiently. By means of the process, thallium and other heavy metal ions in the sintering desulfurization waste water can be effectively removed, environmental pollution is avoided, and waste water treatment cost is effectively lowered.

Description

Technical field [0001] The invention belongs to the field of heavy metal wastewater treatment, and specifically relates to a heavy metal trapping agent and a method for removing thallium for sintering desulfurization wastewater. Background technique [0002] Heavy metals such as thallium in raw ore and coal enter the flue gas during the sintering process, and enter the waste water during the flue gas desulfurization and dust removal process. In this type of heavy metal waste water, the removal of thallium is the most important. Thallium is a highly toxic and harmful substance, its toxicity far exceeds that of As, Hg, Cd, Pb, Cu, and has a certain degree of accumulation, and its toxic effect can last for a long time. Thallium polluted water is extremely harmful to people's health. Thallium has two oxidation states in nature: Tl + And Tl 3+ . Thallium is generally used as Tl in natural water + The form of its compounds is stable, soluble in water, and difficult to settle naturall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22
Inventor 卢欢亮陈灿曾祥专黄志华汪永红叶向东
Owner GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI
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