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Method for preparing calcium-based CO2 adsorbent by doping of rare earth waste

A rare earth doping and waste technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of affecting adsorbent adsorption, reducing adsorption effect, hindering gas diffusion, etc., to improve adsorbent performance, solve the Easy sintering, obvious adsorption effect

Active Publication Date: 2018-12-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Industrial waste gas contains a certain amount of SO 2 、H 2 O, dust, etc., a small amount of H 2 O can activate the calcium-based adsorbent, while SO 2 It can be irreversibly combined with calcium-based adsorbent to form calcium sulfate. Dust will block the pores of the adsorbent, hinder the diffusion of gas, affect the adsorption of the adsorbent, and have a "poisonous" effect on the adsorbent
In addition, the biggest limiting factor for the large-scale industrial application of calcium-based adsorbents is the Taman phenomenon. As the number of cycles increases, the sintering between CaO powders increases, thereby preventing the next step of internal CaO adsorption and reducing the adsorption effect.

Method used

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  • Method for preparing calcium-based CO2 adsorbent by doping of rare earth waste
  • Method for preparing calcium-based CO2 adsorbent by doping of rare earth waste
  • Method for preparing calcium-based CO2 adsorbent by doping of rare earth waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: The rare earth waste in this example is waste rare earth polishing powder, and the waste calcium-based precursor is the marble powder in Comparative Example 1;

[0043] A preparation of calcium-based CO by doping rare earth waste 2 The method of adsorbent, concrete steps are as follows:

[0044] (1) Cleaning the impurities on the surface of rare earth waste (waste rare earth polishing powder), and then dissolving with sodium hydroxide (NaOH), roasting, drying, grinding, dissolving in concentrated hydrochloric acid, oxalic acid precipitation, filtering and roasting to obtain rare earth doping Dopant powder, the composition of waste rare earth polishing powder is shown in Table 4, wherein the oxides of rare earth elements in the rare earth dopant (CeO 2 ) mass percentage content is 51.979%;

[0045]

[0046] (2) Clean the impurities on the surface of the waste calcium-based precursor (waste marble), dry, crush, and then place it at a temperature of 800°C f...

Embodiment 2

[0051] Example 2: The rare earth waste in this example is the same as that in Example 1, and the calcium-based precursor of the waste is the carbide slag calcium-based in Comparative Example 2;

[0052] A preparation of calcium-based CO by doping rare earth waste 2 The method of adsorbent, concrete steps are as follows:

[0053] (1) Cleaning the impurities on the surface of rare earth waste (waste rare earth polishing powder), and then dissolving with sodium hydroxide (NaOH), roasting, drying, grinding, dissolving in concentrated hydrochloric acid, oxalic acid precipitation, filtering and roasting to obtain rare earth doping Dopant powder, the composition of rare earth dopant powder is as shown in Table 4 of embodiment 1, wherein the oxide (CeO 2 ) mass percentage content is 51.979%;

[0054] (2) Clean the impurities on the surface of the waste calcium-based precursor (waste calcium carbide slag), dry, crush, and then place it at a temperature of 950°C for 6 hours to obtain ...

Embodiment 3

[0059] Example 3: The rare earth waste in this example is the same as in Example 1, and the calcium-based precursor of the waste is the egg shell of Comparative Example 3;

[0060] A preparation of calcium-based CO by doping rare earth waste 2 The method of adsorbent, concrete steps are as follows:

[0061] (1) Cleaning the impurities on the surface of rare earth waste (waste rare earth polishing powder), and then dissolving with sodium hydroxide (NaOH), roasting, drying, grinding, dissolving in concentrated hydrochloric acid, oxalic acid precipitation, filtering and roasting to obtain rare earth doping Dopant powder, the composition of rare earth dopant powder is as shown in Table 4 of embodiment 1, wherein the oxide (CeO 2 ) mass percentage content is 51.979%;

[0062] (2) Clean the impurities on the surface of the waste calcium-based precursor (egg shell), dry, crush, and then place the temperature at 900°C for 5 hours to obtain the calcium-based precursor; see Comparativ...

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Abstract

The invention discloses a method for preparing a calcium-based CO2 adsorbent by doping of rare earth waste, and belongs to the technical field of calcium-based CO2 adsorbents. According to the invention, impurities on the surface of rare earth waste are cleaned, and then pretreatment is carried out to obtain rare earth dopant powder, wherein oxide content of the rare earth element in the rare earth dopant is 50% and above; impurities on the surface of waste calcium-based precursor are cleaned, and then through drying and crushing and calcining at 800-950 DEG C for 3-6 h, a calcium-based precursor is obtained; and the rare earth dopant and the calcium-based precursor are uniformly mixed and ground to obtain the doped calcium-based adsorbent, wherein the molar ratio of rear earth element inthe rear earth dopant to calcium in the calcium-based precursor is (0.01-0.2):1. The doped calcium-based CO2 adsorbent can prevent sintering of calcium oxide (CaO) powders, and cyclic adsorption performance of the calcium-based CO2 adsorbent is improved.

Description

technical field [0001] The invention relates to a method for preparing calcium-based CO by doping rare earth waste 2 The sorbent method belongs to the calcium-based CO 2 The field of adsorbent technology. Background technique [0002] High CO 2 A series of negative impacts of pollution on the environment have caused serious consequences, which is a serious problem that human beings must face. According to the annual CO issued by the authoritative department 2 level, in recent years the global CO 2 Emissions have reached 979.5 million tons and are continuing to increase. According to the current research, the adsorption of sorbent is the most important way to reduce CO 2 Effective methods of discharge, capture and reuse, among which, through the concept of "treating waste with waste", using waste raw materials to produce more efficient, environmentally friendly and low-cost adsorbents is currently the most effective method. Among them, the calcium-based adsorbent has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01J20/04B01J20/30
CPCB01D53/02B01J20/041B01D2257/504Y02C20/40
Inventor 陕绍云金帅贾庆明蒋丽红
Owner KUNMING UNIV OF SCI & TECH
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