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A method for recovering antimony from pentavalent antimony water by using sulfide

A technology of sulfide and pentavalent antimony, applied in chemical instruments and methods, water pollutants, light water/sewage treatment, etc., can solve the problems of low pentavalent antimony removal rate and low antimony recovery rate, and achieve secondary pollution Small size, high reduction efficiency, and the effect of promoting removal

Active Publication Date: 2021-03-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to propose a method of utilizing sulfide to reclaim antimony from pentavalent antimony water, to solve the technical problem that the removal rate of pentavalent antimony is low and the antimony recovery rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ultraviolet lamp adopted is an ultraviolet lamp with a rated power of 9W and a central wavelength of 254nm. Specifically, the method includes the following steps:

[0028] 1) Add 200mL of simulated wastewater containing 50mg / L Sb(V) into the reactor;

[0029] 2) Before the reaction, feed nitrogen into the reactor for half an hour to remove dissolved oxygen in the water;

[0030] 3) Add 10mM sodium sulfite to the simulated wastewater, stir to dissolve;

[0031] 4) Add 10mM sodium tetraborate to maintain the pH of the water at about 9.2;

[0032] 5) Turn on the ultraviolet light, illuminate the simulated wastewater for 1 hour, and keep stirring to stimulate the sodium sulfite in the water to generate hydration electrons;

[0033] 6) After the reaction, continue to add 0.32mM sodium sulfide to the waste water, and keep stirring, after reacting for 3 hours, filter and separate the generated sulfide precipitate.

[0034] The reduction efficiency of pentavalent antimo...

Embodiment 2

[0040] The ultraviolet lamp adopted is an ultraviolet lamp with a rated power of 9W and a central wavelength of 225nm. Specifically, the method includes the following steps:

[0041] 1) Add 200mL of simulated wastewater containing 120mg / L Sb(V) into the reactor;

[0042] 2) Add 6mM sodium sulfite to the simulated wastewater, stir to dissolve;

[0043] 3) Add 8mM sodium tetraborate to maintain the pH of the water at about 9.2;

[0044] 4) Turn on the ultraviolet light, illuminate the simulated wastewater for 1.5 hours, and keep stirring to stimulate the sodium sulfite in the water to generate hydration electrons;

[0045] 5) After the reaction, continue to add 0.65mM potassium sulfide to the waste water, and keep stirring, after reacting for 4.5 hours, filter and separate the generated sulfide precipitate.

[0046] The reduction efficiency of pentavalent antimony in water reaches over 99%, and the recovery rate of antimony in water reaches 98.8% through hydride generation at...

Embodiment 3

[0048] The ultraviolet lamp adopted is an ultraviolet lamp with a rated power of 9W and a central wavelength of 280nm. Specifically, the method includes the following steps:

[0049] 1) Add 200mL of simulated wastewater containing 50mg / L Sb(V) into the reactor;

[0050] 2) Before the reaction, feed nitrogen into the reactor for half an hour to remove dissolved oxygen in the water;

[0051] 3) Add 7mM sodium sulfite to the simulated wastewater, stir to dissolve;

[0052] 4) Add 12mM sodium tetraborate to maintain the pH of the water at about 9.2;

[0053] 5) Turn on the ultraviolet light, illuminate the simulated wastewater for 2 hours, and keep stirring to stimulate the sodium sulfite in the water to generate hydration electrons;

[0054] 6) After the reaction, continue to add 0.34mM sodium sulfide to the waste water, and keep stirring. After reacting for 1 hour, filter and separate the generated sulfide precipitate.

[0055] The reduction efficiency of pentavalent antimony ...

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Abstract

The invention discloses a method of recovering antimony from a pentavalent antimony water body by means of sulfide. The method comprises the following steps: reducing pentavalent antimony in the waterbody to trivalent antimony by means of hydration electrons; and converting trivalent antimony in the water body into an antimony sulfide precipitate by means of soluble sulfide to recover antimony inthe water body. By taking a reducing substance which is activated by light to generate the hydration electrons as a source of the hydration electrons, secondary pollution is little. The hydration electrons generated by being activated by light can reduce pentavalent antimony which is hard to remove in the water body into trivalent antimony which is relatively easily removed. The heavy metal antimony in the water body is separated and recovered from a water phase by a way of generating the precipitate further, so that the antimony is recycled, and therefore, the method is stable, reliable andgood in repeatability.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for recovering antimony from pentavalent antimony water by using sulfide. Background technique [0002] Antimony (antimony) is the fifth main group element, which belongs to the same main group as arsenic, and the element symbol is Sb. As early as ancient times, humans have discovered and started to use antimony and its compounds in daily life. Taking advantage of its ability to dissolve gold and other metals, antimony has been used for the purification of gold, copper, silver and other metals as early as the 18th century. The presence of antimony increases the hardness and mechanical strength of lead. Antimony is an important element in the manufacture of batteries, man-made alloys, bullets, cables, etc. [0003] Antimony trioxide (Sb 2 o 3 ) are widely used in flame retardant production, paper making, plastic manufacturing, pigments and other industries. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/30C02F101/20
CPCC02F1/30C02F1/70C02F2101/20
Inventor 赵旭曹迪
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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