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Method for preparing mud adsorbent used for desulfurization of flue-gas

A sludge adsorption and adsorbent technology, which is applied in the direction of separation method, pyrolysis treatment of sludge, chemical instruments and methods, etc., can solve the problems of long preparation period, complicated process, and increased preparation cost, and achieve the reduction of preparation cost and the preparation The effect of simple process and saving reagent consumption

Inactive Publication Date: 2007-11-14
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The defects in the above-mentioned existing preparation method are: 1. Due to the high pyrolysis temperature used in the preparation process, it must reach more than 850 ° C, especially in the preparation method of document 2, more expensive zinc chloride is also used. At the same time, the impregnation ratio with salt solution and the pyrolysis temperature are high, which increases the preparation cost; 2. The adsorption performance of the sludge adsorbent prepared by this method is not strong, and its desulfurization efficiency is low when used for flue gas desulfurization
3. This method requires multiple impregnation and pyrolysis processes, the process is complicated and the preparation cycle is long; 4. The tail gas generated during the pyrolysis process is not treated, causing environmental pollution again

Method used

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  • Method for preparing mud adsorbent used for desulfurization of flue-gas

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Experimental program
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Effect test

specific Embodiment approach

[0016] According to a specific implementation of the process shown in the accompanying drawings:

[0017] Step 1: Put about 3000g of sludge with high moisture content into a desktop drying oven with a working capacity of 250×250×250mm, a rated power of 0.88kW, a rated temperature of 250°C, and an error of ±1°C, and dry it at 103°C After 24 hours, about 30 g of dry sludge with a moisture content of less than 10% was obtained.

[0018] The second step: take 30g of the dry sludge obtained in the first step, and add 4.5g of manganese carbonate according to the loading capacity of 20%. The manganese carbonate is a chemically pure reagent with a content of 44-48%. Add 10 mL of deionized water and manually stir with a glass rod to mix the dry sludge and salt evenly, put it in a drying oven, and dry at 103 °C for 3 h.

[0019] Step 3: Fill the blended dry product obtained in the second step into a φ30×800mm stainless steel heating tube from the opened flange end. When adding, be care...

Embodiment 2

[0023] According to another kind of specific implementation of flow process shown in accompanying drawing: its concrete steps are identical with embodiment 1, and difference is:

[0024] Step 2: Add 6.8g of manganese carbonate according to the loading capacity of 30%, add 10mL of deionized water and stir manually with a glass rod to mix the dry sludge and salt evenly, put it in a drying oven, and dry at 103°C for 3h. Sludge adsorbents with different adsorption properties are prepared through subsequent steps.

Embodiment 3

[0026] According to the third specific implementation of the process flow shown in the accompanying drawings: its specific steps are the same as in Example 1, except that:

[0027]Step 2: Add 6.7 g of manganese acetate according to the loading capacity of 20%. The manganese acetate is an analytical reagent with a content of ≥99.0%. Add 10 mL of deionized water and manually stir with a glass rod to mix the dry sludge and salt evenly, put it in a drying oven, and dry at 103 °C for 3 h. Sludge adsorbents with different adsorption properties are prepared through subsequent steps.

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Abstract

A sludge adsorbent used for desulfurizing fume is prepared through proportionally mixing dried sludge with manganese carbonate (or acetate), and low-temp thermal decomposing to make the high oxidized manganese oxide to be carried by the charred sludge.

Description

1. Technical field [0001] The invention relates to a method for preparing an adsorbent, in particular to a method for preparing an adsorbent for flue gas desulfurization by using the surplus sludge of an urban sewage plant as a raw material. 2. Background technology [0002] At present, most urban and industrial wastewater is treated by biochemical sludge method, and a large amount of excess sludge will be produced at the same time. The excess sludge contains organic matter, rich in nitrogen and phosphorus, heavy metals and pathogenic bacteria, etc. Improper treatment will cause great damage to the environment. pollute. In the prior art, there are reports on using excess sludge to prepare adsorbents for flue gas desulfurization and water treatment. Regarding the preparation method of sludge adsorbent for flue gas desulfurization, such as literature 1, "Adsorption of SO 2 onsewage sludge-derived materials", Environ.Sci.Technol, 2001, 35, p3263, discloses a method of prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/00B01D53/04B01D53/50C02F11/10
Inventor 钟秦余兰兰
Owner NANJING UNIV OF SCI & TECH
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