A method for harmless co-processing of heavy metal sludge and organic silicon waste

Abstract

The invention discloses a method for harmless co-processing of heavy metal sludge and organosilicon waste. The method comprises: (1) first drying the heavy metal sludge and organosilicon waste, and then grinding the metal sludge and organosilicon waste separately crushed until the particle size is less than 0.55mm; (2) mix fine-grained heavy metal sludge, organic silicon waste and caustic soda evenly according to the proportioning ratio, and obtain a high-temperature solidified vitrified mixed material; (3) mix the obtained mixed material in a rich Carry out high-temperature curing under an oxygen atmosphere to obtain a cured body stabilized by heavy metals. Starting from the components and characteristics of the waste itself, the present invention makes full use of the hydrocarbon organic matter and silicon components in the organosilicon waste, which not only realizes the energy conversion of the hydrocarbon organic matter in the waste, but also reduces the operating cost of the high-temperature solidification disposal process; at the same time It provides silicon components for the high-temperature solidification vitrification of heavy metal sludge, and obtains silicon-based glass materials with resource potential, realizes the co-processing effect of waste, and achieves the purpose of energy saving and environmental protection.

Description

technical field

[0001] The invention relates to the field of harmless co-processing of heavy metal waste and organic waste, in particular to a method for harmless co-processing of heavy metal sludge and organic silicon waste. Background technique

[0002] With the development of industry, a large amount of wastewater containing heavy metals is continuously produced, and a large amount of heavy metal sludge is produced after wastewater treatment. Heavy metal sludge is hazardous waste because it contains heavy metal ions such as Zn, Cu, Ni, and Cr. If it is not treated, it will easily cause serious pollution to the environment. At present, the process of harmless disposal of heavy metal sludge mainly includes chemical stabilization, cement kiln co-processing and high temperature solidification. The destination of heavy metal sludge after chemical stabilization is usually hazardous waste landfill, but the volume of hazardous waste landfill is limited and cannot be continuously...

Examples

Embodiment 1

[0027] In this embodiment, zinc-containing sludge is treated as the treatment object, and waste disposal is performed by high-temperature solidification with organic silicon waste. like figure 1 As shown, the specific method is as follows:

[0028] Select zinc-containing sludge and pyrolysis residue for drying, so that the moisture content of zinc-containing sludge and pyrolysis residue is reduced from 70% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The zinc-containing sludge with a particle size of less than 0.55mm after grinding, the pyrolysis residue and caustic soda are uniformly mixed at a dry basis mass percentage of 45:40:15 to obtain a mixture.

[0029] One part of the mixed material is cured at a temperature of 1350° C., the curing time is 3.5 hours respectively, and the high temperature curing atmosphere is oxygen-enriched, and the oxygen concentration is 25%. After high temperature solidi...

Embodiment 2

[0035] In this example, copper-containing sludge is used as the treatment object, and waste disposal is carried out by solidifying with organic silicon waste at high temperature. The specific method is as follows:

[0036] Select copper-containing sludge and pyrolysis residue for drying, so that the moisture content of copper-containing sludge and pyrolysis residue is reduced from 75% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The copper-containing sludge with a particle size of less than 0.55 mm after grinding, the cracking residue and caustic soda are mixed uniformly at a dry basis mass percentage of 50:40:10. The mixed materials were respectively melted at a temperature of 1400° C., the melting time was 3 hours, and the oxygen concentration was 25%. After high-temperature solidification, it is rapidly cooled by water quenching to form silicon-based glass material B.

[0037] The vitreous body con...

Embodiment 3

[0039] In this example, nickel-containing sludge is used as the treatment object, and waste disposal is carried out by solidifying with organic silicon waste at high temperature. The specific method is as follows:

[0040] Select nickel-containing sludge and pyrolysis residue for drying, so that the moisture content of copper-containing sludge and pyrolysis residue is reduced from 76% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The copper-containing sludge with a particle size of less than 0.55mm after grinding, the pyrolysis residue and caustic soda are mixed uniformly at a mass percentage of 52:40:8 on a dry basis. The mixed materials were respectively melted at a temperature of 1450° C., the melting time was 3 hours, and the oxygen concentration was 25%. After high-temperature solidification, water quenching and rapid cooling form silicon-based glass material C.

[0041] The vitreous body content ...

technical field

[0001] The invention relates to the field of harmless co-processing of heavy metal waste and organic waste, in particular to a method for harmless co-processing of heavy metal sludge and organic silicon waste. Background technique

[0002] With the development of industry, a large amount of wastewater containing heavy metals is continuously produced, and a large amount of heavy metal sludge is produced after wastewater treatment. Heavy metal sludge is hazardous waste because it contains heavy metal ions such as Zn, Cu, Ni, and Cr. If it is not treated, it will easily cause serious pollution to the environment. At present, the process of harmless disposal of heavy metal sludge mainly includes chemical stabilization, cement kiln co-processing and high temperature solidification. The destination of heavy metal sludge after chemical stabilization is usually hazardous waste landfill, but the volume of hazardous waste landfill is limited and cannot be continuously...

Examples

Embodiment 1

[0027] In this embodiment, zinc-containing sludge is treated as the treatment object, and waste disposal is performed by high-temperature solidification with organic silicon waste. like figure 1 As shown, the specific method is as follows:

[0028] Select zinc-containing sludge and pyrolysis residue for drying, so that the moisture content of zinc-containing sludge and pyrolysis residue is reduced from 70% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The zinc-containing sludge with a particle size of less than 0.55mm after grinding, the pyrolysis residue and caustic soda are uniformly mixed at a dry basis mass percentage of 45:40:15 to obtain a mixture.

[0029] One part of the mixed material is cured at a temperature of 1350° C., the curing time is 3.5 hours respectively, and the high temperature curing atmosphere is oxygen-enriched, and the oxygen concentration is 25%. After high temperature solidi...

Embodiment 2

[0035] In this example, copper-containing sludge is used as the treatment object, and waste disposal is carried out by solidifying with organic silicon waste at high temperature. The specific method is as follows:

[0036] Select copper-containing sludge and pyrolysis residue for drying, so that the moisture content of copper-containing sludge and pyrolysis residue is reduced from 75% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The copper-containing sludge with a particle size of less than 0.55 mm after grinding, the cracking residue and caustic soda are mixed uniformly at a dry basis mass percentage of 50:40:10. The mixed materials were respectively melted at a temperature of 1400° C., the melting time was 3 hours, and the oxygen concentration was 25%. After high-temperature solidification, it is rapidly cooled by water quenching to form silicon-based glass material B.

[0037] The vitreous body con...

Embodiment 3

[0039] In this example, nickel-containing sludge is used as the treatment object, and waste disposal is carried out by solidifying with organic silicon waste at high temperature. The specific method is as follows:

[0040] Select nickel-containing sludge and pyrolysis residue for drying, so that the moisture content of copper-containing sludge and pyrolysis residue is reduced from 76% and 50% to below 10% respectively; caustic soda does not need to be dried because its moisture content is lower than 5%. The copper-containing sludge with a particle size of less than 0.55mm after grinding, the pyrolysis residue and caustic soda are mixed uniformly at a mass percentage of 52:40:8 on a dry basis. The mixed materials were respectively melted at a temperature of 1450° C., the melting time was 3 hours, and the oxygen concentration was 25%. After high-temperature solidification, water quenching and rapid cooling form silicon-based glass material C.

[0041] The vitreous body content ...

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