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Normal-temperature and normal-pressure preparation method and application of metal selenide mercury adsorbent

A technology of metal selenides and adsorbents, applied in the direction of metal selenides/tellurides, selenium/telluride compounds, chemical instruments and methods, etc., can solve problems such as inability to store for a long time, low production capacity, and inability to realize large-scale applications, and achieve Satisfies the large-scale preparation conditions, low cost and energy consumption, and the effect of reducing the cost of mercury removal

Pending Publication Date: 2021-08-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the water-soluble negative divalent selenium ion precursors (such as sodium selenide, potassium selenide, etc.) are easily hydrolyzed at room temperature and pressure, they cannot be stored for a long time. Both can only be prepared by hydrothermal method, a method with high energy consumption and low production capacity, which cannot be applied on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Copper selenide adsorbent was prepared under normal temperature and pressure conditions. The specific steps are as follows: dissolve the selenium powder in an appropriate amount of sodium hydroxide solution of hydrazine hydrate, and after it is completely dissolved, pour the copper sulfate solution into the selenium solution (the molar ratio of Cu:Se element is 1:1), and the resulting Copper selenide adsorbent can be obtained after precipitation (aging time: 30 min), separation, drying and sieving.

[0034] The obtained copper selenide adsorbent was placed in a cylindrical quartz glass fixed-bed reactor with a length of 10 cm and an inner diameter of 1 cm. Mercury is produced through the mercury permeation tube, and the concentration of elemental mercury at the inlet and outlet of the reactor is monitored using a VM3000 mercury detector. The initial elemental mercury concentration is 1 mg / m 3 , the concentration of elemental mercury after passing through the copper sel...

Embodiment 2

[0036] The cobalt selenide adsorbent was prepared under normal temperature and pressure conditions. The specific steps are as follows: Sodium selenite is dissolved in sodium borohydride solution (adding an appropriate amount of potassium hydroxide), and an equal amount of cobalt chloride solution is poured into the sodium selenite solution (the molar ratio of Co:Se element 1:1), the resulting precipitate (aging time 30 min) was separated, dried, and sieved to obtain the cobalt selenide adsorbent.

[0037] The obtained cobalt selenide adsorbent was mixed with dirty acid containing 0.05 mg / L mercury, and after stirring for 10 min, the mercury concentration in the dirty acid was lower than 0.001 mg / L. In addition, the TCLP method was used to simulate the mercury leaching rate of mercury-containing adsorbents exposed to the environment, and it was found that the proportion of mercury leaching from mercury-containing cobalt selenide was only 0.04%, and the mercury leaching amount w...

Embodiment 3

[0039]Preparation of metal nickel selenide supported polyurethane foam adsorbent at room temperature. The specific steps are as follows: suspend polyurethane foam in water, add CTAB to the suspension and stir for 24 h, add an appropriate amount of sodium borohydride-sodium hydroxide solution of selenium powder to the above suspension, continue stirring for 24 h, and then add an appropriate amount of Nickel sulfate solution, the resulting precipitate (aging time 1 h) was separated, dried, and sieved to obtain metal nickel selenide loaded polyurethane foam adsorbent.

[0040] The polyurethane foam loaded with metal selenide was placed in a cylindrical quartz glass fixed-bed reactor with an inner diameter of 1 cm, and mercury was generated through a mercury permeation tube. The concentration of elemental mercury at the inlet and outlet of the reactor was monitored with a VM3000 mercury detector, and the initial elemental mercury concentration was 1 mg / m 3 , the concentration of ...

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Abstract

The invention discloses a normal-temperature and normal-pressure preparation method and application of a metal selenide mercury adsorbent. The metal selenide mercury adsorbent is prepared at normal temperature and normal pressure by adopting a precipitation method. The metal selenide mercury adsorbent comprises a compound formed by selenium and one or more of chromium, manganese, iron, copper, cobalt, nickel, zinc, molybdenum, silver and cadmium and a composite of the compound, unstable mercury is converted into stable mercury selenide, mercury in industrial tail gas or by-products of fire coal, metallurgy, waste incineration, cement production and the like is removed, mercury enriched in mercury-containing articles for daily use is absorbed, the recovery and reutilization of mercury resources are realized, and mercury to be treated can exist in the forms of a simple substance state, a free state and / or a compound state and the like. As the metal selenide has extremely high mercury adsorption capacity and adsorption rate, realization of large-scale preparation of the metal selenide under normal temperature and pressure conditions has great significance on mercury pollution prevention and control, and the corresponding technology has wide market application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and in particular relates to a preparation method and application of a metal selenide mercury adsorbent at normal temperature and pressure. Background technique [0002] Mercury poses a huge hazard to the ecological environment and human health due to its persistence, high toxicity and bioaccumulation. According to the latest "Global Mercury Assessment Report" released by UNEP, the global anthropogenic mercury emissions have reached about 2,500 tons per year, far exceeding the mercury emitted into nature due to natural activities. In August 2017, the global Minamata Convention came into effect in 128 signatories including China, with the purpose of: (1) limiting the increasing global mercury pollution emissions, (2) solving the problem of mercury resources in the earth’s crust through recycling mercury resources increasingly exhausting problems. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/26B01J20/30B01D53/04B01D53/06B09B3/00C01B19/00C02F1/28C02F101/20
CPCC01B19/007B01J20/0237B01J20/0225B01J20/262B01J20/0262B01J20/0229B01D53/04B01D53/06C02F1/281C02F1/288B01D2258/0283B01D2257/602C02F2101/20B09B3/10
Inventor 杨泽群郑威李海龙杨建平
Owner CENT SOUTH UNIV
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