Natural sulfide mineral-based material as well as preparation method and application thereof

A technology of base materials and minerals, applied in the field of preparation, natural sulfide mineral base materials, can solve the problems of hindering large-scale production and wide application, small specific surface area of ​​natural sulfide minerals, poor mercury adsorption capacity, etc., to achieve abundant reserves and low cost. , the effect of improving mercury removal performance

Active Publication Date: 2019-12-24
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in general, high-efficiency nanosulfide minerals are not naturally generated, so the synthesis process must be strictly controlled, including relatively complex precursors and surfactants, which greatly increases the cost and hinders its large-scale production and widespread use. application
[0005] Natural sulfide minerals are rich in reserves and low in cost, but the specific surface area of ​​natural sulfide minerals is extremely small, and their mercury adsorption capacity is poor

Method used

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  • Natural sulfide mineral-based material as well as preparation method and application thereof
  • Natural sulfide mineral-based material as well as preparation method and application thereof
  • Natural sulfide mineral-based material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Se 2- Preparation of precursor solution: Mix 20 mL of deionized water and 20 mL of hydrazine hydrate (80wt%), adjust the mixed solution to be alkaline with NaOH, and dissolve 0.016 mol, 0.032 mol, 0.064 mol, and 0.128 mol of selenium powder in the above mixture. Solution

[0035] (2) The natural pyrrhotite (Fe 1-x S) with Se 2- The molar ratio of 1:4, 1:8, 1:16, 1:32 is added with Se 2- Precursor, stir for 30 min;

[0036] (3) Combine the adsorbent in step (2) with Se-containing 2- The precursor liquid was separated, and the separated adsorbent was washed 5 times with deionized water, dried in an oven at 60 ℃ for 12 hours, and passed through a 100-mesh sieve to obtain a new modified metal sulfide mercury adsorbent, which was recorded as 4Se-FeS and 8Se- FeS, 16Se-FeS, 32Se-FeS, no Se 2- Natural pyrrhotite (Fe 1-x S) Denoted as 0Se-FeS;

[0037] (4) Weigh 100 mg of adsorbent and place it in a cylindrical quartz glass fixed bed reactor with a length of 10 cm and an inner di...

Embodiment 2

[0039] (1) Se 2- Preparation of precursor solution: Mix 20 mL of deionized water and 20 mL of hydrazine hydrate (80wt%), adjust the mixed solution to be alkaline with NaOH, and dissolve 0.032 mol of selenium powder in the above mixed solution;

[0040] (2) The natural pyrrhotite (Fe 1-x S) with Se 2- The molar ratio of 1:8 is added with Se 2- Precursor, stir for 30 min;

[0041] (3) Combine the adsorbent in step (2) with Se-containing 2- The precursor liquid was separated, and the separated adsorbent was washed with deionized water 5 times, dried in an oven at 60 ℃ for 12 h, and passed through a 100-mesh sieve to obtain a new modified metal sulfide mercury adsorbent, denoted as 8Se-FeS;

[0042] (4) Weigh 100 mg of 8Se-FeS and place it in a cylindrical quartz glass fixed bed reactor with a length of 10 cm and an inner diameter of 1 cm. Produce elemental mercury, Hg through the mercury permeation tube 0 Initial concentration 80 μg / m 3 , Respectively add simulated flue gas as N 2 , N 2...

Embodiment 3

[0044] (1) The 8Se-FeS modified in Example 1 is added in a fixed bed after the electrostatic precipitator (including wet electrostatic precipitator), Hg 0 The emission is 3.77 mg / m 3 , The flue gas volume is 18000 m 3 / h, the fixed bed 8Se-FeS load is 2 kg, divided into 4 layers of load, Hg 0 The removal rate reaches 90%, further adsorption deactivates the adsorbent; the deactivated adsorbent removes Hg 0 The effect picture is like image 3 Shown.

[0045] (2) Place the deactivated 8Se-FeS in a heating furnace, heat it under the protection of nitrogen at 400 ℃ for 1 h, and then cool the adsorbent to room temperature by natural cooling to obtain the regenerated adsorbent. The high-concentration mercury-containing gas released during the adsorbent regeneration process adopts the condensation method for mercury resource recovery, and the tail gas is discharged after mercury removal by the adsorbent;

[0046] (3) After heat treatment, the 8Se-FeS is combined with Se again 2- The molar r...

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Abstract

The invention discloses a natural sulfide mineral-based material as well as a preparation method and an application thereof. According to the method, a simple one-step anion exchange reaction is employed, and natural metal sulfide minerals are soaked in a Se2-precursor solution to synthesize selenium ion-coated natural sulfide minerals serving as a novel mercury adsorbent; the natural metal sulfide mineral comprises pyrrhotite, pyrite, sphalerite, alabandite, tungstenite and a mixture of the pyrrhotite, pyrite, sphalerite, alabandite and tungstenite. The mercury adsorbent obtained by the invention is used as a mercury removal medium to be in contact with gas-phase elemental mercury in a fixed bed, a fluidized bed or an injection tower, so that the gas-phase elemental mercury is converted into stable mercury sulfide. The preparation method of the natural sulfide mineral-based material is rich in raw material reserve, simple in process and wide in application range; the natural sulfide mineral-based material has extremely high mercury adsorption capacity and adsorption rate, is applied to removal of elemental mercury in a gas phase, and has the advantages of simplicity in operation,high efficiency, environmental friendliness of mercury removal products and the like.

Description

Technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and specifically relates to a natural sulfide mineral-based material, a preparation method and an application thereof. Background technique [0002] Because of its widespread and high toxicity, atmospheric mercury pollution has attracted global attention in recent decades. According to the Global Mercury Assessment Report released by the United Nations Environment Programme (UNEP) in 2018, due to the rapid development of industry, the annual mercury emissions due to human activities have increased by 25% in 7 years. Among them, coal-fired power plants are one of the largest sources of man-made mercury emissions. Therefore, the Minamata Convention lists the coal-burning process as one of the focus of mercury pollution prevention and control. [0003] The mercury emitted by coal-fired power plants usually includes three forms, namely elemental mercury (Hg 0 ), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/02B01J20/30B01J20/34B01D53/02
CPCB01D53/02B01D2257/602B01J20/0218B01J20/0222B01J20/0229B01J20/045B01J20/3475
Inventor 李海龙杨泽群杨琴
Owner CENT SOUTH UNIV
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