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Manganese mining area wastewater treatment method

A technology for wastewater treatment and mining areas, applied in mining wastewater treatment, water/sewage treatment, multi-stage water/sewage treatment, etc., to achieve the effects of easy implementation, low reagent cost, and improved concrete strength

Active Publication Date: 2017-09-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing methods are mainly limited to the removal of sulfate radicals in chlor-alkali wastewater, and for metallurgical wastewater or mining water bodies containing high concentrations of sulfate radicals and low concentrations of other metal ions and organic matter, there is currently no easy method to treat them

Method used

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  • Manganese mining area wastewater treatment method
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  • Manganese mining area wastewater treatment method

Examples

Experimental program
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Embodiment 1

[0042] This embodiment selects the polluted water body of a manganese mining area in Guangxi, the sulfate radical concentration in the water is 606.0mg / L, the calcium ion concentration is 236.4mg / L, the magnesium ion concentration is 36.85mg / L, and the manganese ion concentration is 4.51mg / L, pH is 6.99, other water quality parameters are as shown in table 1, add the humic acid of 10mg / L in described water sample, to test the effect that the present invention removes organic matter. The treatment temperature for removing sulfate radicals and other metal ions and humic acid by the process of the present invention is 20°C.

[0043] S1. Add 3.5mmol / L NaAlO 2 , 7.1mmol / L CaO, so that the Ca in the water sample 2+ / Al 3+ / SO 4 2- The initial molar ratio is 2.06:0.56:1, and the pH of the water sample is 12.14;

[0044] S2. Stir at a speed of 300r / min for 60min, and remove the precipitate after standing for 30min;

[0045] S3. Adjust the pH of the water sample to 6.5, and stir ...

Embodiment 2

[0052] In this embodiment, a polluted water body in a manganese mining area in Guangxi is selected, and the water quality parameters are shown in Table 1. The treatment temperature was 20°C.

[0053] Repeat Example 1 with the same steps described, the difference is that in the step S1, add 3.0mmol / LNaAlO 2 , 7.1mmol / L CaO, so that the Ca in the water sample 2+ / Al 3+ / SO 4 2- The initial molar ratio was 2.06:0.48:1 and the pH was 12.14. The concentrations of ions in the effluent after treatment are shown in Table 1.

Embodiment 3

[0055] In this embodiment, a polluted water body in a manganese mining area in Guangxi is selected, and the water quality parameters are shown in Table 1. The treatment temperature was 20°C.

[0056] Repeat Example 1 with the same steps described, the difference is that in the step S1, add 4.0mmol / LNaAlO 2 , 7.1mmol / L CaO, so that the Ca in the water sample 2+ / Al 3+ / SO 4 2- The initial molar ratio was 2.06:0.63:1 and the pH was 12.14. The concentrations of ions in the effluent after treatment are shown in Table 1.

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Abstract

The invention discloses a manganese mining area wastewater treatment method. A water body in a manganese mining area is treated by adopting an ettringite and coagulating sedimentation combined process, Ca<2+>, Al<3+>, SO4<2-> and OH<-> in an alkaline water solution are mutually combined to generate a water-insoluble compound Ca6Al2(SO4)3(OH)12.26H2O, the water-insoluble compound is converted into a floc through mixed flocculation, and the effect of removing SO4<2-> and Ca<2+> simultaneously is reached in a precipitated manner; moreover, Mg<2+> or heavy metal ions existing in the water sample can be combined with OH<-> in an alkaline condition to be removed through precipitate generation, and humic acid and residual Al<3+> in wastewater are removed in a flocculent precipitate manner. The method is simple and convenient in operation and easy to implement, the generated precipitate when sulfate radicals are removed is ettringite, the method is pollution-free for the environment, and the method can be used for building materials, so that the concrete strength is improved, and secondary utilization is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a method for treating waste water in a manganese mining area. Background technique [0002] my country is rich in manganese ore resources. While vigorously mining, the water bodies in the mining area and surrounding areas are also polluted to varying degrees. Sulfuric acid is often used in the mining and processing of manganese ore, resulting in a large amount of sulfate in the wastewater. The wastewater is discharged into natural water bodies without effective treatment, making the water in the manganese mining area contain high concentrations of sulfate radicals; and the soil in the mining area is affected by H in acid rain. 2 CO 3 and H 2 SO 3 Erosion, CaCO 3 Continuous dissolution increases the hardness of the water. At the same time, the water body and river water in the mining area have a high degree of salinity. The salt effect caused by part o...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/20C02F103/10
CPCC02F1/5245C02F1/58C02F1/62C02F1/66C02F9/00C02F2101/101C02F2101/20C02F2103/10
Inventor 刘正乾王琪吴晓晖涂嘉玲闫娅慧崔玉虹章北平
Owner HUAZHONG UNIV OF SCI & TECH
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