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Calcium-based adsorbent and preparation method thereof

A calcium-based adsorbent and adsorbent technology, applied in the field of calcium-based adsorbent and its preparation, to achieve the effects of simple operation steps, reduced erosion, convenient sampling and post-analysis treatment

Inactive Publication Date: 2018-12-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorbents in the existing adsorption tubes are easily affected by flue gas components, especially SO 2 Therefore, the adsorption tube method is mainly aimed at the sampling and monitoring of flue gas mercury after the desulfurization unit

Method used

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  • Calcium-based adsorbent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Weigh 6g of mesoporous SiO 2 Add to 50ml deionized water to obtain solution A, weigh 8.8gCa(CH 3 COO) 2 ·H 2 O was added to 50ml of deionized solution B;

[0022] (2) Add solution B to solution A at a constant speed, and stir for 6 hours using a magnetic stirrer at room temperature, and add 1.38 g of potassium carbonate during the stirring process to obtain a colloidal solid;

[0023] (3) Place the colloidal solid in an oven and dry it at 105°C for 12 hours to make it completely dry, then place the dried colloidal solid in a muffle furnace, first at 175°C Roast for 1 hour first, then heat up to 850°C for 3 hours;

[0024] (4) Grind the calcined colloidal solid on a mortar and pass through a 24-40 mesh sieve to obtain an adsorbent with a particle size of 0.38mm-0.7mm. The SiO2 in the adsorbent 2 The molar ratio of , CaO and potassium carbonate is 10:5:1. Prepared adsorbents such as figure 1 with figure 2 shown.

[0025] pass figure 1 and figure 2 It can ...

Embodiment 2

[0027] (1) Weigh 6g of mesoporous SiO 2 Add to 50ml deionized water to obtain solution A, weigh 17.6gCa(CH 3 COO) 2 ·H 2 O was added to 50ml of deionized solution B;

[0028] (2) Add solution B to solution A at a constant speed, and stir for 6 hours using a magnetic stirrer at room temperature, and add 1.38 g of potassium carbonate during the stirring process to obtain a colloidal solid;

[0029] (3) Place the colloidal solid in an oven and dry it at 105°C for 12 hours to make it completely dry, then place the dried colloidal solid in a muffle furnace, first at 175°C Roast for 1 hour first, then heat up to 850°C for 3 hours;

[0030] (4) Grind the calcined colloidal solid on a mortar and pass through a 24-40 mesh sieve to obtain an adsorbent with a particle size of 0.38mm-0.7mm. The SiO2 in the adsorbent 2 , CaO and potassium carbonate molar ratio is 10:10:1.

Embodiment 3

[0032] (1) Weigh 6g of mesoporous SiO 2 Add to 50ml deionized water to obtain solution A, weigh 35.2gCa(CH 3 COO) 2 ·H 2 O was added to 50ml of deionized solution B;

[0033] (2) Add solution B to solution A at a constant speed, and stir for 6 hours using a magnetic stirrer at room temperature, and add 1.38 g of potassium carbonate during the stirring process to obtain a colloidal solid;

[0034](3) Place the colloidal solid in an oven and dry it at 105°C for 12 hours to make it completely dry, then place the dried colloidal solid in a muffle furnace, first at 175°C Roast for 1 hour first, then heat up to 850°C for 3 hours;

[0035] (4) Grind the calcined colloidal solid on a mortar and pass through a 24-40 mesh sieve to obtain an adsorbent with a particle size of 0.38mm-0.7mm. The SiO2 in the adsorbent 2 The molar ratio of , CaO and potassium carbonate is 10:20:1.

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Abstract

The invention discloses a calcium-based adsorbent and a preparation method thereof. The adsorbent takes SiO2 as the carrier, adopts CaO as the active ingredient and uses an alkali metal salt as the modifier. The preparation method includes: firstly adding a Ca(CH3COO)2.H2O aqueous solution into an aqueous solution of SiO2, performing stirring and adding the alkali metal salt to prepare a colloidalsolid, then drying the colloidal solid, performing roasting at 170-180DEG C for 1-2h, and then conducting roasting at 845-855DEG C for 3-4h, thus obtaining the calcium-based adsorbent. The remarkableadvantages of the invention are as follows: when the calcium-based adsorbent is applied to the morphological measurement of mercury component in industry, the operation steps are simple, the samplingand later analysis processing are convenient, the mercury concentration sampling measurement precision is high, therefore the calcium-based adsorbent is suitable for wide range popularization, and inthe adsorption performance test of fixed bed Hg<0> / Hg<2+>, the calcium-based adsorbent keeps zero adsorption efficiency to Hg<0>all the time, and realizes complete adsorption of Hg<2+>.

Description

technical field [0001] The invention belongs to the field of adsorbents, in particular to a calcium-based adsorbent and a preparation method thereof. Background technique [0002] As a class of harmful substances, mercury and its compounds have strong atmospheric migration, enrichment and potential bioaccumulation, and the harm caused by mercury and its compounds to human health and natural environment such as ecological water, soil and atmosphere is increasing day by day. In recent years, industrial processes such as metal smelting, cement production, waste incineration, chlor-alkali industry, and coal-fired boilers have increasingly become important sources of anthropogenic mercury emissions in the atmosphere. Therefore, in order to limit the man-made emissions of mercury, many countries and regions around the world have successively formulated corresponding laws, regulations and industry standards. [0003] Mercury in the exhaust gas of coal-fired industrial boilers is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D15/20
CPCB01D15/20B01J20/04B01J20/041B01J20/103
Inventor 段钰锋李春峰汤红健朱纯郑逸武李雅宁
Owner SOUTHEAST UNIV
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