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Process method for converting metal magnesium slag into desulphurizer of boiler

A technology of metal magnesium and desulfurization agent, which is applied in the direction of chemical instruments and methods, separation methods, solid waste removal, etc., can solve the problems of difficult transportation, affecting desulfurization effect, and inability to directly use boilers for desulfurization, so as to reduce dust pollution and improve Effect of waste heat recovery effect

Inactive Publication Date: 2013-10-16
山西猗顿生态环保股份有限公司
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Problems solved by technology

[0011] 4. Most of the spherical magnesium slags are gradually pulverized and become loose lumps, and the incompletely reacted slag balls remain spherical or granular;
[0013] At this time, the external moisture of the magnesium slag powder to be transported is about 20-30%, and there are 15-25% of incomplete pulverized agglomerates and particles mixed in it. in boiler desulfurization

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  • Process method for converting metal magnesium slag into desulphurizer of boiler

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Embodiment Construction

[0038] The specific embodiment of the present invention is described as follows step by step:

[0039] 1) Pour ~1000℃ high-temperature magnesium slag balls (equivalent diameter about 80mm) from the metal magnesium smelting reduction furnace into the drum-type air-water cooling pulverizer by a forklift, and pass through the water-cooled surface heat exchange and air-cooled contact Heat exchange to reduce the outlet temperature below 200°C. Since the main composition of magnesium slag is β-type calcium silicate (β-CaOSiO2), when the temperature drops below 675°C, it begins to transform into γ-type calcium silicate (γ-CaOSiO2), and the volume expands, making the slag ball gradually natural chalking. When the material leaves the cooling pulverizer, most of the slag balls that have been thermally reduced and reacted in the magnesium smelting furnace have been pulverized into fine powders less than 1 mm, but the incompletely reacted slag balls are pulverized on the outside and the ...

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Abstract

The invention discloses a method for converting metal magnesium smelting and reducing slag into a desulphurizer for a coal-fired boiler. The system mainly comprises a drum-type air-water cooled crusher, an airtight water cooled buried scraper conveyor, an airtight vibrating screen classifier, an airtight bucket elevator, a magnesium slag powder storehouse, a bag-type dust collector, a draught fan and the like, and a pipeline connecting system. The waste slag by smelting the metal magnesium is treated to become the desulphurizer used by a circulating fluidized bed boiler, and the recovery and reuse of the waste are realized. The process method has the advantages of economy, energy conservation and emission reduction: a metal magnesium smelting unit converts the wastes into commodities, and the air pollution and soil pollution are removed and the residual-heat utilization is realized. In addition, the cheap desulphurizer can be provided for fluidized bed boilers in electric power plants. The method belongs to the field of treatment for solid wastes and is applied to the waste residue treatment and utilization of the metal magnesium smelting unit by the thermal reduction method.

Description

Technical field: [0001] The invention discloses a method for converting metal magnesium smelting reduction slag (all referred to as magnesium slag hereinafter) into a desulfurizer for boilers, so as to realize waste recycling and achieve the purposes of creating benefits and improving the environment. The invention belongs to the field of solid waste treatment and is suitable for the treatment and utilization of waste residues in metal magnesium smelting units. Background technique: [0002] China's magnesium industry started in the 1980s, and has developed rapidly since the 1990s, especially in recent years. At present, China has become the world's largest producer of magnesium, with a production capacity of more than 1 million tons. The L.M.Pidgeon method, that is, the thermal reduction method, is almost the only method for the production of metal magnesium in China. For every ton of metal magnesium produced, about 6.5 to 7 tons of magnesium slag are produced, and the ann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B01D53/82B01D53/50
Inventor 房靖华武军杨天徐刘大惠
Owner 山西猗顿生态环保股份有限公司
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