Method and system for co-processing waste incineration fly ash by using rotary hearth furnace

Abstract

The invention discloses a method and system for co-processing waste incineration fly ash through a rotary hearth furnace, and the system for co-processing waste incineration fly ash through the rotary hearth furnace comprises a material mixing machine, a ball press machine, a drying machine, the rotary hearth furnace, a waste heat boiler and a dust removal device.The method comprises the steps that after ferrous metallurgy dust and mud, waste incineration fly ash, a binder and water are evenly mixed, the mixture is heated to the room temperature; the method comprises the following steps: firstly, preparing a metal pellet, pressing into pellets to obtain carbon-containing pellets, then drying the carbon-containing pellets, feeding the carbon-containing pellets into a rotary hearth furnace, carrying out reduction roasting to obtain metallized pellets and zinc-containing flue gas, and then carrying out heat exchange and dust removal on the zinc-containing flue gas to obtain zinc-containing dust. According to the method, the waste incineration fly ash and the ferrous metallurgy dust sludge are cooperatively treated in the rotary hearth furnace, the dezincification rate and the metallization rate of the ferrous metallurgy dust sludge are increased through the waste fly ash, the using amount of a binder is saved, the cost is reduced, meanwhile, the content of dioxin in the waste incineration fly ash is reduced, and the environment friendliness is achieved. And harmless treatment and resource utilization of the waste incineration fly ash and the ferrous metallurgy dust sludge are achieved.

Description

technical field

[0001] The invention belongs to the fields of metallurgy and energy, and in particular relates to a method and a system for co-processing waste incineration fly ash by utilizing a rotary hearth furnace. Background technique

[0002] The iron and steel metallurgical production process will produce a large amount of metallurgical dust and sludge. At present, most domestic enterprises use the rotary hearth furnace method to treat them. The rotary hearth furnace direct reduction process has higher recovery rate of valuable elements such as iron and zinc, lower energy consumption, less pollution, and higher added value of products; therefore, the rotary hearth furnace direct reduction process has become an effective method for the treatment of iron-containing dust and sludge. One of the best choices, this process is characterized by high temperature and rapid reduction, the metallization rate can reach 65-75%, and the dezincification rate can reach 85-90%. [000...

Examples

Embodiment 1

[0062] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0063] Iron and steel metallurgical dust sludge composition: iron content 42%. Carbon content 8.5%, zinc content: 2.0%, chlorine content 0.48%;

[0064] Garbage fly ash contains 30% CaO, 18% Cl, 150ng / g dioxin,

[0065] The metallurgical dust sludge, garbage fly ash, binder and water are mixed in a ratio of 100:8:1.5:12 by weight, and pressed to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 50%; The content of iron in the dry base is 38.4wt%, the zinc content is 1.96wt%, the chlorine content is 1.9wt%, and the dioxin is 12ng / g.

[0066] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set to 200° C. The moisture content of the carbon-containing pellets after drying was 0.79 wt%. Reduction roasting, the temperature in the preheating zone of the rotary hearth furnace...

Embodiment 2

[0071] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0072] Composition of iron and steel metallurgical dust sludge: iron content of 45%. Carbon content 10, zinc content: 2.4%, chlorine content 0.45%;

[0073] Garbage fly ash contains 38% CaO, 15% Cl, 100ng / g dioxin,

[0074] The metallurgical dust sludge, garbage fly ash, binder and water are mixed in a ratio of 100:6:2:10.5 by weight, and pressed to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 40%; The content of iron in the dry base is 41.4wt%, the zinc content is 2.2wt%, the chlorine content is 1.5wt%, and the dioxin is 5.8ng / g.

[0075] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set at 190°C. The moisture content of the carbon-containing pellets after drying was 0.9 wt%. For reduction roasting, the temperature in the preheating zone of the rotary hearth f...

Embodiment 3

[0080] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0081] Composition of iron and steel metallurgical dust sludge: iron content of 18%. Carbon content 11, zinc content: 2.8%, chlorine content 0.49%;

[0082] The content of garbage fly ash is 44% CaO, 10% Cl, 40ng / g dioxin,

[0083] The metallurgical dust sludge, garbage fly ash, binder and water are mixed and pressed in a ratio of 100:5:2.5:10.5 by weight to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 30%; The content of iron in the dry base is 44.65wt%, the zinc content is 2.6wt%, the chlorine content is 0.92wt%, and the dioxin is 3.72ng / g.

[0084] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set to 180° C. The moisture content of the carbon-containing pellets after drying was 0.73 wt%. Reduction roasting, the temperature in the preheating zone of the rotar...

technical field

[0001] The invention belongs to the fields of metallurgy and energy, and in particular relates to a method and a system for co-processing waste incineration fly ash by utilizing a rotary hearth furnace. Background technique

[0002] The iron and steel metallurgical production process will produce a large amount of metallurgical dust and sludge. At present, most domestic enterprises use the rotary hearth furnace method to treat them. The rotary hearth furnace direct reduction process has higher recovery rate of valuable elements such as iron and zinc, lower energy consumption, less pollution, and higher added value of products; therefore, the rotary hearth furnace direct reduction process has become an effective method for the treatment of iron-containing dust and sludge. One of the best choices, this process is characterized by high temperature and rapid reduction, the metallization rate can reach 65-75%, and the dezincification rate can reach 85-90%. [000...

Examples

Embodiment 1

[0062] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0063] Iron and steel metallurgical dust sludge composition: iron content 42%. Carbon content 8.5%, zinc content: 2.0%, chlorine content 0.48%;

[0064] Garbage fly ash contains 30% CaO, 18% Cl, 150ng / g dioxin,

[0065] The metallurgical dust sludge, garbage fly ash, binder and water are mixed in a ratio of 100:8:1.5:12 by weight, and pressed to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 50%; The content of iron in the dry base is 38.4wt%, the zinc content is 1.96wt%, the chlorine content is 1.9wt%, and the dioxin is 12ng / g.

[0066] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set to 200° C. The moisture content of the carbon-containing pellets after drying was 0.79 wt%. Reduction roasting, the temperature in the preheating zone of the rotary hearth furnace...

Embodiment 2

[0071] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0072] Composition of iron and steel metallurgical dust sludge: iron content of 45%. Carbon content 10, zinc content: 2.4%, chlorine content 0.45%;

[0073] Garbage fly ash contains 38% CaO, 15% Cl, 100ng / g dioxin,

[0074] The metallurgical dust sludge, garbage fly ash, binder and water are mixed in a ratio of 100:6:2:10.5 by weight, and pressed to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 40%; The content of iron in the dry base is 41.4wt%, the zinc content is 2.2wt%, the chlorine content is 1.5wt%, and the dioxin is 5.8ng / g.

[0075] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set at 190°C. The moisture content of the carbon-containing pellets after drying was 0.9 wt%. For reduction roasting, the temperature in the preheating zone of the rotary hearth f...

Embodiment 3

[0080] In the present embodiment, the method for co-processing waste incineration fly ash using rotary hearth furnace is as follows:

[0081] Composition of iron and steel metallurgical dust sludge: iron content of 18%. Carbon content 11, zinc content: 2.8%, chlorine content 0.49%;

[0082] The content of garbage fly ash is 44% CaO, 10% Cl, 40ng / g dioxin,

[0083] The metallurgical dust sludge, garbage fly ash, binder and water are mixed and pressed in a ratio of 100:5:2.5:10.5 by weight to obtain carbon-containing pellets, wherein the cost of the binder is reduced by 30%; The content of iron in the dry base is 44.65wt%, the zinc content is 2.6wt%, the chlorine content is 0.92wt%, and the dioxin is 3.72ng / g.

[0084] The carbon-containing pellets were sent to a dryer for drying, and the drying temperature was set to 180° C. The moisture content of the carbon-containing pellets after drying was 0.73 wt%. Reduction roasting, the temperature in the preheating zone of the rotar...

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