Fly ash sulfur fixation melting harmless treatment method

A harmless treatment, fly ash technology, applied in the direction of chemical instruments and methods, combustion methods, incinerators, etc., can solve the problem of poor harmless treatment effect

Active Publication Date: 2021-06-25
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a harmless treatment method for solid sulfur melting of fly ash, s

Method used

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  • Fly ash sulfur fixation melting harmless treatment method
  • Fly ash sulfur fixation melting harmless treatment method
  • Fly ash sulfur fixation melting harmless treatment method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0068] Example 1

[0069] The fly ash composition is shown in Table 1 (%):

[0070]

[0071] use figure 1 The flow processes the above flying gray, the amount of treatment is 50t / d, the specific is as follows:

[0072]Put the fly ash, reducing agent toner (particle size 2 = 1.4) The amount of the amount is 15% of the flying gray, and the quartz sand distribution is 20% of the flying gray amount, resulting in a mixed raw material. Where the molar ratio of C and S in the mixed raw material is 2.5, using SiO 2 -CAO-FeO slag, mixed raw materials SiO 2 Alone 2 O 3 The total weight of M, Cao and MGO is recorded as N, Feo, Mno, NA 2 O and K 2 The total weight of O is remembered L, m / N is 1.15, and L / m is 0.25.

[0073] The mixed raw material was pressed into a pneumatic ball having a particle diameter of 2 to 4 cm, and then sent into the electric furnace for solid sulfur, wherein the electric furnace is a graphite electrode AC electric furnace, which is a rectangular shape. Durin...

Example Embodiment

[0080] Example 2

[0081] Unlike Example 1, the S / C = 3.5 of the mixture was mixed.

[0082] Other parameters are the same as those of the examples. Flue gas release temperature 1662 ° C, smoke volume 979nm 3 / h (which is about 500 nm 3 / h). External exhaust gas volume 13848nm 3 / h. The secondary combustion temperature is controlled at 900 ° C, the fuel consumption is 79.46 nm 3 / h (natural gas). The slag ingredients are shown in Table 5, and the molten salt composition is shown in Table 6, and the secondary fly ash ingredient is shown in Table 7.

[0083]

[0084]

[0085]

[0086] Calculated: The direct solidsisulfur ratio of this embodiment is 83.70% (relatively original flying ash), and the remaining S is SO 2 In the form of flue gas, transformed into a gypsum sludge. Since the ingredient is C / S to increase to 3.5 (compared to example one), the sulfurized sulfur is achieved, but the content of the flue gas in the furnace increases, which is obvious twice with the...

Example Embodiment

[0087] Example 3

[0088] The furnace melt treatment is flying as asses, and the first embodiment is as follows:

[0089] Flying ash, reducing agent toner (particle size 2 -AL 2 O 3 -CAO slag, SiO in mixed raw materials 2 Alone 2 O 3 The total weight is recorded as M, CaO, and MgO is recorded as N, M / N is 1.20.

[0090] Using electric furnace melt solid sulfur, the slag temperature is 1350 ° C, the molten salt layer temperature is 1280 ° C. The slag depth is 500mm, the molten salt layer depth is 200mm, the material layer depth is 100mm, the electric furnace flue gas is blended twice, and the water sprinkler is cooled. Secondary burning flue gas temperature 1200 ° C, drum into natural gas 00nm 3 / h. Cooling is cooled to 200 ° C, and the amount of water is 0.97t / h, and the air is compressed by 2174 nm. 3 / h, export smoke 4506nm 3 / h. Then passes through the bag to be dusty, washing, dehydrogen, and exterior exhaust gas 4478 nm 3 / h. The slag ingredients are shown in Table 8,...

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Abstract

The invention provides a fly ash sulfur fixation melting harmless treatment method. The method comprises the following steps that fly ash, a reducing agent and flux are mixed to obtain a mixed raw material, wherein the molar ratio of C to S in the mixed raw material is 2.5 to 3.5; the slag type is controlled to be an SiO2-Al2O3-CaO slag type, and m/n is 0.8 to 1.5; or the slag type is controlled to be an SiO2-CaO-FeO slag type, m/n is 1.0 to 1.6, and l/m is 0.15 to 0.30; the mixed raw material is fed into an electric furnace in a blowing mode or a pressed material ball mode to be subjected to sulfur fixation melting, the temperature of a slag layer is controlled to range from 1250 DEG C to 1350 DEG C in the period, the temperature of a molten salt layer on the top of the slag layer is controlled to be smaller than 1200 DEG C, and molten salt, slag and exhaust gas are obtained; the molten salt is cooled, and the slag is subjected to water cooling or air cooling; and the exhaust gas is treated through one of three modes. According to the method, a systematic solution is provided for fly ash treatment in the aspects of material blending, sulfur fixation melting, exhaust gas treatment and the like, and the maximum harmless treatment is achieved.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of waste incineration fly ash, in particular to a method for harmless treatment of fly ash solid sulfur melting. Background technique [0002] A large amount of fly ash is produced during the purification process of domestic waste / hazardous incineration flue gas. Fly ash contains harmful components such as Cl, S, and heavy metal elements. If it is not treated and stored randomly, it will cause irreversible pollution to the soil and water environment. The fly ash is melted at high temperature so that the heavy metals in it are solidified in the high temperature slag, and the glass slag is obtained after water crushing, which can better realize the harmless disposal of the fly ash. Currently reported fly ash melting technologies include plasma melting and submerged electric furnace melting, both of which can achieve fly ash melting, as listed below: [0003] Patent CN207709525 U disclose...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00F23G7/06
CPCB09B5/00F23G7/06B09B2101/30B09B3/40
Inventor 唐续龙胡立琼高术杰
Owner CHINA ENFI ENGINEERING CORPORATION
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