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Method for treating acidic mine wastewater containing heavy metal ions

A technology for acid mine wastewater and heavy metal ions, which is applied in the fields of filtration treatment, water/sewage treatment, mining wastewater treatment, etc. It can solve the problems of high energy consumption, complex process and high cost of magnetization and heating

Pending Publication Date: 2021-03-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN108862492A mentions "A Device and Method for Cooperative Treatment of Wastewater Containing Heavy Metals by Magnetization Method and Vulcanization Method".
Patent CN107162281A mentions "A Treatment Method for Removing Heavy Metal Ions in Smelting Wastewater", which has complicated process and high operation and maintenance costs

Method used

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  • Method for treating acidic mine wastewater containing heavy metal ions
  • Method for treating acidic mine wastewater containing heavy metal ions
  • Method for treating acidic mine wastewater containing heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Artificially crushing the natural pyrrhotite, then using a three-head grinder to grind for 2 minutes to obtain pyrrhotite particles with a particle size of less than 150 μm;

[0061] (2) Take 1g pyrrhotite particles and 5mol L -1 h 2 SO 4 Perform mixing and stirring reaction at 25°C, and control the liquid-solid ratio of pyrrhotite and acid to 20mL g -1 , The acid solution dripping time is 30min.

[0062] (3) passing the generated hydrogen sulfide into pH 3.5, Pb 2+ The concentration is 25mg L -1 The mixed precipitation reaction was carried out in the simulated acid wastewater, the reaction temperature was 25°C, and the reaction time was 6h.

[0063] (4) The acid waste water and the lead sulfide precipitation are separated into solid and liquid by a filtration method to obtain the lead sulfide precipitation particles and the lead removal waste water.

[0064] After testing, Pb in the treated wastewater 2+ The concentration is 0.01mg L -1 , The removal rate r...

Embodiment 2

[0066] (1) Artificially crushing the natural pyrrhotite, then using a three-head grinder to grind for 2 minutes to obtain pyrrhotite particles with a particle size of less than 150 μm;

[0067] (2) Take 1g pyrrhotite particles and 5mol L -1 h 2 SO 4 Perform mixing and stirring reaction at 25°C, and control the liquid-solid ratio of pyrrhotite and acid to 20mL g -1 , The acid solution dripping time is 30min.

[0068] (3) Pass the generated hydrogen sulfide into pH 3.5, Zn 2+ The concentration is 25mg L -1 The mixed precipitation reaction was carried out in the wastewater, the reaction temperature was 25°C, and the reaction time was 4h.

[0069] (4) Separating the acidic wastewater and the zinc sulfide precipitation into solid and liquid to obtain zinc sulfide precipitation particles and zinc removal wastewater.

[0070] After testing, Zn in the treated wastewater 2+ The concentration is 0.15mg L -1 , The removal rate reaches 99.4%.

Embodiment 3

[0072] (1) Artificially crushing the natural pyrrhotite, using a three-head grinder to grind the ore, and using a vibrating screen to sieve to obtain pyrrhotite particles with a particle size of 38-150 μm;

[0073] (2) Take 1g pyrrhotite particles and 5mol L -1 h 2 SO 4 Perform mixing and stirring reaction at 25°C, and control the liquid-solid ratio of pyrrhotite and acid to 20mL g -1 , The acid solution dripping time is 30min.

[0074] (3) Pass the produced hydrogen sulfide into pH 2.5, Cd 2+ The concentration is 20mg L -1 The mixed precipitation reaction was carried out in the simulated acid wastewater, the reaction temperature was 25°C, and the reaction time was 4h.

[0075] (4) Separating the acidic wastewater and the cadmium sulfide precipitation into solid and liquid to obtain cadmium sulfide precipitation particles and cadmium removal wastewater.

[0076] After testing, the Cd in the treated wastewater 2+ The concentration is 0.56mg L -1 , The removal rate reach...

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Abstract

The invention relates to a method for treating acidic mine wastewater containing heavy metal ions, which comprises the following steps: crushing and grinding magnetite to obtain magnetite particles; digesting the magnetite particles with sulfuric acid to obtain hydrogen sulfide gas; and introducing the hydrogen sulfide into the acidic mine wastewater containing heavy metal ions, and carrying out solid-liquid separation to obtain sulfide precipitates and wastewater without heavy metal ions. According to the method, pyrrhotite which is one of acidic mine wastewater sources serves as a vulcanizing agent source to treat heavy metal ions in the wastewater, and the effect of treating waste with waste is achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating acidic mine wastewater containing heavy metal ions. Background technique [0002] pyrrhotite (Fe 1-X S, X=0~0.223) is one of the common metal sulfide ores, which is widely distributed and associated with many metal sulfide ores, and is one of the main sources of sulfur in metal minerals. Pyrrhotite has strong reactivity, and it is easy to produce acid mine wastewater (hereinafter referred to as AMD) after contacting with air and water. AMD has the characteristics of high concentration of heavy metal ions, low pH value (pH=1~2), and large amount of wastewater. If it is directly discharged into the environment without treatment, it will cause very serious environmental problems. Patent CN108862492A mentions "A Device and Method for Cooperative Treatment of Wastewater Containing Heavy Metals by Magnetization and Vulcanization". This method needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/62C02F101/20C02F103/10
CPCC02F1/62C02F1/001C02F2101/20C02F2103/10
Inventor 李育彪肖蕲航柯春云段婉青彭樱
Owner WUHAN UNIV OF TECH
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