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Harmless treatment method of fly ash solid sulfur melting

A technology for harmless treatment and fly ash, which is applied in chemical instruments and methods, combustion methods, incinerators, etc., and can solve problems such as poor harmless treatment effect.

Active Publication Date: 2021-08-31
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, so as to solve the problem in the prior art that the harmless treatment effect is poor when dealing with waste incineration fly ash

Method used

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  • Harmless treatment method of fly ash solid sulfur melting
  • Harmless treatment method of fly ash solid sulfur melting
  • Harmless treatment method of fly ash solid sulfur melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0070]

[0071] use figure 1 The process shown is to process the above-mentioned fly ash, and the processing capacity is 50t / d, the details are as follows:

[0072]Mix fly ash, reducing agent carbon powder (particle size2 =1.4) The mixing amount accounts for 15% of the fly ash amount, and the mixing amount of quartz sand accounts for 20% of the fly ash amount to obtain a mixed raw material. The molar ratio of C and S in the mixed raw material is 2.5, using SiO 2 -CaO-FeO slag type, SiO in mixed raw materials 2 and Al 2 o 3 The total weight of CaO and MgO is recorded as m, the total weight of CaO and MgO is recorded as n, FeO, MnO, Na 2 O and K 2 The total weight of O is recorded as l, m / n is 1.15, and l / m is 0.25.

[0073] The mixed raw materials are pressed into balls with a particle size of 2~4cm, and then sent to an electric furnace for sulfur fixation and melting. The electric furnace adopts a graphite ...

Embodiment 2

[0081] The difference from Example 1 is that the S / C of the mixed material is 3.5.

[0082] Other parameters are the same as in the embodiment. The flue gas outlet temperature is 1662°C, and the flue gas volume is 979Nm 3 / h (the air leakage is about 500Nm 3 / h). Outer exhaust gas volume 13848Nm 3 / h. The secondary combustion temperature is controlled at 900°C, and the fuel consumption is 79.46Nm 3 / h (natural gas). The composition of slag is shown in Table 5, the composition of molten salt is shown in Table 6, and the composition of secondary fly ash is shown in Table 7.

[0083]

[0084]

[0085]

[0086] Calculated: the direct sulfur fixation rate of this embodiment is 83.70% (relative to the original fly ash), and the remaining S is expressed as SO 2 into the flue gas in the form of deacidification into gypsum sludge. As the ingredients are C / S increased to 3.5 (compared to Example 1), the sulfur fixation effect becomes better, but the CO content in the fl...

Embodiment 3

[0088] Adopt electric furnace melting to handle fly ash, and embodiment 1 difference is as follows:

[0089] Fly ash, reducing agent carbon powder (particle size 2 -Al 2 o 3 -CaO slag type, SiO in mixed raw materials 2 and Al 2 o 3 The total weight of CaO and MgO is recorded as m, the total weight of CaO and MgO is recorded as n, and m / n is 1.20.

[0090] The electric furnace is used for melting and solidifying sulfur, the temperature of the slag is 1350°C, and the temperature of the molten salt layer is 1280°C. The depth of the slag is 500mm, the depth of the molten salt layer is 200mm, and the depth of the material layer is 100mm. The flue gas of the electric furnace is cooled by secondary combustion and sprayed with wind and water. The temperature of secondary combustion flue gas is 1200℃, and natural gas is blown into 00Nm 3 / h. The temperature is lowered to 200°C by wind cooling, the amount of water sprayed is 0.97t / h, and the compressed air is 2174Nm 3 / h, outlet...

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Abstract

The invention provides a harmless treatment method for solid sulfur melting of fly ash. The method includes: mixing fly ash, reducing agent, and flux to obtain mixed raw materials; wherein the molar ratio of C and S in the mixed raw materials is 2.5 to 3.5; the control slag type is SiO 2 ‑Al 2 o 3 ‑CaO slag type, and m / n is 0.8~1.5; or, the control slag type is SiO 2 ‑CaO‑FeO slag type, and m / n is 1.0~1.6, l / m=0.15~0.30; the mixed raw materials are sent into the electric furnace in the form of injection or pressed balls for sulfur solidification and melting, during which the temperature of the slag layer is controlled at 1250~1350°C, and control the temperature of the molten salt layer above the slag layer below 1200°C to obtain molten salt, slag and flue gas; cool the molten salt, and water-cool or air-cool the slag; use one of three methods Dispose of fumes. The invention provides a systematic solution for fly ash treatment from the aspects of batching, solid sulfur melting, flue gas treatment, etc., and realizes the maximum degree of harmless treatment.

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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Patent Type & Authority Patents(China)
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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