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Treatment technology for zinc-containing dust of rotary hearth furnace

A treatment process and rotary hearth furnace technology, which is applied in the field of metallurgy, can solve problems such as high investment cost, zinc ring formation, and low single-time processing capacity, and achieve the effect of reducing investment cost and saving cost

Inactive Publication Date: 2018-12-21
CISDI RES & DEV CO LTD
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Problems solved by technology

[0004] In view of this, in order to solve the problem that the existing rotary hearth furnace method for processing zinc-containing dust has a low single-time processing amount and high investment cost, and the rotary kiln method for processing zinc-containing dust easily causes zinc to form rings in the furnace, it provides a A Treatment Process for Zinc-Containing Dust of Rotary Hearth Furnace

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  • Treatment technology for zinc-containing dust of rotary hearth furnace

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Embodiment Construction

[0022] Preferred embodiments of the present invention will be described in detail below.

[0023] Such as figure 1 The treatment process for the zinc-containing dust of the rotary hearth furnace shown includes the following steps:

[0024] A. The zinc-containing dust (blast furnace bag dust + converter dust removal dust 50,000 t / a) produced by the steel mill is transported to the batching warehouse by tanker, and is quantitatively fed into the mixing tank through spiral weighing. After adding water, the concentration of zinc-containing dust is 25%, after three times of stirring and concentration, the concentration of zinc-containing dust after stirring and concentration is 50%, and it enters the filter for dehydration to fully remove K, Na, Cl and other elements in the zinc-containing dust. The dehydrated zinc-containing dust sludge is uniformly mixed with dry ash and then pressurized by a coal rod machine. The water content of the extruded mixture is 20%. The mass of the deh...

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Abstract

The invention belongs to the technical field of metallurgy, and relates to a treatment technology for zinc-containing dust of a rotary hearth furnace. K, Na, Cl and other elements in the zinc-containing dust are fully removed by adopting a wet way technology, wherein the wet way technology is to make the zinc-containing dust of a steel and iron mill to be mixed with water and subjected to multiplestirring, concentration and then dehydration; a mode of coal rod machine extrusion is adopted to make raw materials form at a moisture content of 15-20%, meanwhile, drying, preheating, heating and reducing roasting of the raw materials are completed in the rotary hearth furnace, thus raw material drying does not need to be configured with a dryer, drying is directly carried out in the rotary hearth furnace, and the cost is saved; and meanwhile, flue gas of the rotary hearth furnace is cooled by adopting a mode of spray cooling, no boiler or heat exchanger is required to be configured, the investment cost of flue gas treatment of the rotary hearth furnace is reduced, the flue gas of the whole rotary hearth furnace can meet the treatment requirements of the zinc-containing dust of medium and small steel mills, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a process for treating zinc-containing dust of a rotary hearth furnace. Background technique [0002] There will be a lot of dust in steel production, its main component is iron oxide, but it contains a certain amount of zinc oxide. If it is not used, it will not only waste resources but also pollute the environment. The traditional treatment method is to return the dust to sintering, but this The treatment method will enrich the zinc in the blast furnace, cause nodules in the furnace, affect the smooth operation of the blast furnace and damage the smelting equipment. [0003] There are rotary hearth furnace method and rotary kiln method for zinc-containing dust fire treatment. Rotary hearth furnace method has become a mature and reliable treatment technology for zinc-containing dust. This technology can not only reduce the iron element in zinc-containing dust to sponge iron, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C21B13/00B01D50/00
CPCC21B13/00C22B1/02B01D50/60Y02P10/20
Inventor 田文杰郭秀键雍海泉
Owner CISDI RES & DEV CO LTD
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