Method for removing heavy metal ions in high-salinity water by using hydrogen sulfide

A technology of heavy metal ions and high salt water, applied in chemical instruments and methods, water pollutants, chemical industry, etc.

Active Publication Date: 2020-11-06
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no method for using this equipment to remove copper ions, lead ions, zinc ions, nickel ions or arsenate in nickel chloride aqueous solution, nickel sulfate aqueous solution, sodium chloride aqueous solution, sodium sulfate aqueous solution or a mixture of several solutions Literature report

Method used

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  • Method for removing heavy metal ions in high-salinity water by using hydrogen sulfide

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Experimental program
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Effect test

Embodiment 1

[0025] Reaction device: including a reaction kettle 14, a stirring paddle 4 penetrating through the kettle body is installed in the reactor body 14, and a sealing packing ring 2 is used to seal between the stirring paddle 4 and the reaction kettle body 14. A porous sieve plate 7 is arranged in the body of the reaction kettle, and the porous sieve plate divides the reaction kettle into a reaction zone 15 and a ripening zone 16 . The stirring paddle 4 is composed of three layers of evenly distributed flat-blade paddles and six porous flat-blade turbine paddles (the aperture is 0.5~5mm, and the stirring paddle material is titanium alloy, zirconium alloy, and nickel alloy materials that are resistant to acid and alkali corrosion.), And the flat-blade paddle is installed in the aging zone 16 of the reactor, and the porous flat-blade turbine paddle is installed in the reaction zone 15 of the reactor; the stirring paddle 4 is powered by the frequency conversion motor 1 installed on th...

Embodiment 2

[0036]Reaction device: with embodiment 1.

[0037] Reaction process: use the above device to conduct a continuous depth removal experiment of copper, nickel, lead and zinc in the mixed high-salt solution of sodium chloride and sodium sulfate with pH = 2.5. Set the peripheral speed of the stirring blades to 3.1 m / s, the molar ratio of hydrogen sulfide to heavy metal ions to 2.0, the temperature of the reaction liquid to 65°C, and the time it takes for the liquid to reach the outlet 13 to be 5.3 min. The specific operation process is:

[0038] (1) Close the liquid outlet valve and air inlet valve, open the liquid inlet valve and air outlet valve to ensure the airtightness of the reaction device;

[0039] (2) Pass the mixed high-salt solution into the reactor according to the designed liquid flow rate (100L / h), and feed the liquid while stirring;

[0040] (3) After the liquid in the kettle reaches 1 / 6 of the volume of the kettle, stop feeding the liquid, open the air inlet valv...

Embodiment 3

[0047] Reaction device: with embodiment 1.

[0048] Reaction process: use the above device to conduct a deep removal experiment for copper, nickel, lead, zinc and arsenic ions in the sodium chloride high-salt solution with pH=4.5. Set the peripheral speed of the stirring blade to 2.5m / s, the molar ratio of hydrogen sulfide to heavy metal ions to 2.0, the temperature of the reaction solution to 65°C, and set the time for the liquid to reach the outlet 13 to be 21 minutes. The specific operation process is:

[0049] (1) Close the liquid outlet valve and air inlet valve, open the liquid inlet valve and air outlet valve to ensure the airtightness of the reaction device;

[0050] (2) Pass the mixed high-salt solution into the reactor according to the designed liquid flow rate (25L / h), and feed the liquid while stirring;

[0051] (3) When the liquid in the kettle reaches 1 / 6 of the volume of the kettle, stop feeding the liquid, open the air inlet valve, and let in hydrogen sulfide...

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Abstract

The invention discloses a method for removing heavy metal ions in high-salinity water by using hydrogen sulfide. The method comprises reaction equipment and a reaction process. The reaction equipmentcomprises a reaction kettle body, a stirring paddle penetrating through the kettle body is installed in the reaction kettle body, and the stirring paddle is composed of a flat blade paddle and a porous flat blade type turbine paddle. A porous sieve plate is arranged in the reaction kettle to divide the interior of the reaction kettle into a reaction area and a curing area; the reaction kettle bodyis provided with a liquid inlet and an air inlet; the liquid outlet is formed in the reaction kettle body corresponding to the curing area; an exhaust port is formed in the top of the reaction kettlebody. The high-salt solution and the hydrogen sulfide gas are violently stirred by a turbine of a stirring paddle in a bottom reaction area of the reactor, are in close contact with each other and fully react; and after the reaction is finished, the two phases enter the curing area for deep reaction and gas-liquid separation, separated unreacted gas enters a tail gas absorption system through anexhaust port, and liquid overflows out of the kettle through a liquid outlet. Heavy metal ions in the reacted high-salt aqueous solution can be reduced to 0.0005 g/L or below, and the purification requirement of the high-salt aqueous solution is met.

Description

technical field [0001] The invention relates to a method for removing heavy metal ions in high-salt water, in particular to a method for hydrogen sulfide to remove heavy metal ions in high-salt water, which is used for water purification in hydrometallurgy and chemical industry. Background technique [0002] Heavy metal pollution has become one of the most serious environmental problems today, and heavy metal pollution has received special attention because of their persistent and persistent damage to the environment. There are many methods for removing heavy metal ions in sewage, and there are different removal methods for different heavy metal ions. The chemical precipitation method is a method to convert the dissolved heavy metals in the heavy metal wastewater into water-insoluble heavy metal compounds, including hydroxide precipitation, carbonate precipitation and sulfide precipitation. In the sulfide precipitation method, since hydrogen sulfide is a water-soluble corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F101/20C02F103/16
CPCC02F1/62C02F2103/16C02F2101/20Y02P20/10
Inventor 郭勇周通卢晓锋郑军福李亦婧卢建波赵重梁晓静巫旭王立成王世荣辛怀达欧策成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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