CN103159423A

CN103159423A - Method for applying sintered desulfurized ash to granulated blast-furnace slag powder

Info

Publication number: CN103159423A
Application number: CN2011104253829A
Authority: CN
Inventors: 苏兴文; 宋武; 李晓阳; 曹鑫; 边淑清
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2011-12-17
Filing date: 2011-12-17
Publication date: 2013-06-19

Abstract

The invention relates to the technical field of desulfurized ash solid waste utilization in sintering production, in particular to a method for applying sintered desulfurized ash to granulated blast-furnace slag powder. The method is characterized in that desulfurized ash is fed from a vertical milling machine outside circulation bucket elevator in the slag powder production process through a feeding weighing scale and a spiral conveyor in a matched mode, the mixing proportion of the desulfurized ash in the slag powder in not larger than 4%, the optimized proportion of the desulfurized ash in the slag powder is 0.1-2.95%, and the desulfurized ash and the slag powder enter the vertical milling machine together for grinding winnowing processing and then enter a finished-product storage. The chemical components (wt%) of the desulfurized ash are 3.05-10.79 of sulfur trioxide and 0.74-2.3 of chloridion. Compared with the prior art, the method has the advantages that the desulfurized ash is enabled to be a modifying material in the slag powder to meet the using property requirements of the slag powder, and under the condition that the requirement that the content of the chloridion in the slag powder is smaller than 0.06% according to the national standard is met, environment pollution caused by the desulfurized ash is reduced, and reasonable utilization of wastes is achieved.

Description

A kind of sintering desulfuration ash is applied to the method for GBFS

Technical field

The present invention relates in SINTERING PRODUCTION the desulphurize fly ash solid waste and utilize technical field, relate in particular to a kind of method that sintering desulfuration ash is applied to GBFS.

Background technology

In the iron making and sintering process, owing to containing in clinker mineral just like objectionable impuritiess such as sulfurous gas, hydrogenchloride, hydrogen fluoride, the quality of these objectionable impurities impact ironmaking, generally adopting the semi-dry process flue gas desulphurization method to carry out desulfurization in sintering process processes, can effectively reduce the oxious components such as sulphur, chlorine and fluorine in clinker mineral, but the desulphurize fly ash that produces in sweetening process can't be utilized, desulphurize fly ash is to exist with dry powder molecule state, store difficulty, main employing is buried, the mode of mine backfilling is processed, and environment is caused very big pollution.

GBFS (hereinafter to be referred as slag powders) is the levigate concrete admixture that reaches certain specific surface area of granulated blast-furnace slag process oven dry, now has been widely used in building material industry.

Notification number is that the Chinese invention patent " semi-dry desulphurization ash and slag composite admixture and preparation method thereof " of CN101717218 A discloses a kind of desulphurize fly ash application method, the method is desulphurize fly ash and the blast-furnace slag process drying treatment that produces of making steel that semi-dry process flue gas desulphurization is produced, guarantee that water content is less than 1%, mix the semi-dry desulphurization ash of 3%-8% in slag powders, to ensure that simultaneously the rear sulphur trioxide of mixing, chloride ion content are no more than existing slag powders standard, at the powder grinds, obtain finished product after mixing.

The method is a kind of feasible application method of present desulphurize fly ash, but still has the following disadvantages:

1, the desulphurize fly ash blending is dried in grain slag, greatly increase cost in actual production, the oven dry in mill mostly of existing slag powders production technique, the feasibility that the mixture of oven dry desulphurize fly ash and grain slag operates in actual production process is less.

2, due to the combined influence of the factors such as area, raw material, semi-dry process flue gas desulphurization equally, chemistry in the desulphurize fly ash that produces, physical properties is different, in general desulphurize fly ash, chloride ion content is take 1-2.3% as general, as admix this desulphurize fly ash of 5% the chloride ion content of slag powders reach 0.115% (disregarding chloride ion content in slag powders), the slag powders national standard be chloride ion content less than 0.06%, can't satisfy national standard.

Summary of the invention

The object of the present invention is to provide a kind of sintering desulfuration ash to be applied to the method for GBFS; overcome the deficiencies in the prior art; rationally recycle the desulphurize fly ash in sintering process; promote slag powders active; the impact of the objectionable impuritiess such as inhibition sintering desulphurize fly ash institute sulfur-bearing, chlorine on the slag powders quality developed a circular economy.

The present invention realizes by the following technical solutions:

A kind of sintering desulfuration ash is applied to the method for GBFS, desulphurize fly ash is coordinated material loading from vertical mill outer circulation bucket elevator through feed weigher and spiral conveyer in the slag powders production process, the blending ratio of desulphurize fly ash in slag powders is not more than 4%, and desulphurize fly ash is processed into stockyard through jointly entering the vertical mill grinding selection by winnowing with slag powders;

The chemical composition of described desulphurize fly ash (wt%) is: crystal water 0.5-2.0, sulphur trioxide 3.05-10.79, calcium oxide 43.10-53.96, silica 1 .87-3.67, ferric oxide 1.00-1.58, magnesium oxide 1.59-2.32, loss on ignition 29.04-34.81, chlorion 0.74-2.3.

The preferred proportion of desulphurize fly ash in slag powders is 0.1-2.95%.

Compared with prior art, the invention has the beneficial effects as follows: make the desulphurize fly ash that can not process that in production, sintering desulfuration produces be recycled utilization, become material modified in slag powders, promote slag powders active, satisfy the use properties of slag powders, Decrease production cost, satisfy the slag powders national standard be chloride ion content less than 0.06% situation under, digest desulphurize fly ash as far as possible, reduce desulphurize fly ash to the pollution of environment, realize that refuse rationally utilizes, and develops a circular economy.

Description of drawings

Fig. 1 is embodiment of the present invention process flow sheet.

In figure: 1-desulphurize fly ash feed bin 2-belt feeding claims 3-spiral conveyer 4-grinding machine outer circulation bucket elevator 5-vertical mill 6-stockyard

Embodiment

The present invention will be further described below in conjunction with embodiment.

see Fig. 1, it is embodiment of the present invention process flow sheet, an airtight desulphurize fly ash feed bin 1 is set, in production, the desulphurize fly ash that produces in the sintering desulfuration process is collected and be transported in desulphurize fly ash feed bin 1, desulphurize fly ash in the slag powders production process from the grinding machine outer circulation bucket elevator 4 of vertical mill 5 through belt feeding claim 2 and spiral conveyer 3 coordinate material loadings, the fusion metering of slag powders and desulphurize fly ash is all controlled by 5 ‰ precision feed weighers, adopt different mix proportionses according to different need of productions, make the activity of mixing rear slag powders index, degree of mobilization, the requirement that all is up to state standards of the index such as sulphur trioxide and chlorion, desulphurize fly ash enters stockyard 6 through jointly entering the processing of vertical mill grinding selection by winnowing with slag powders.

For chloride ion content in desulphurize fly ash, mix proportions (wt%) scope of desulphurize fly ash in slag powders is preferably:

Be 0.74 as chloride ion content, mix proportions (wt%) 0.1-2.95.

Be 1.5 as chloride ion content, mix proportions (wt%) 0.1-2.5.

Be 2.3 as chloride ion content, mix proportions (wt%) 0.1-1.7.

Because calcium oxide content in desulphurize fly ash is higher; phenomenons such as boning, harden very easily appears; be prone to bonding formation lump after running into especially granulated blast-furnace slag; processing should guard against damp in storage process; in desulphurize fly ash, chloride ion content is higher in addition; the chlorion enrichment easily occurs, should guarantee the homogeneity of mixing.

Claims

1. a sintering desulfuration ash is applied to the method for GBFS, it is characterized in that, desulphurize fly ash is coordinated material loading from vertical mill outer circulation bucket elevator through feed weigher and spiral conveyer in the slag powders production process, the blending ratio of desulphurize fly ash in slag powders is not more than 4%, and desulphurize fly ash is processed into stockyard through jointly entering the vertical mill grinding selection by winnowing with slag powders;

The chemical composition of described desulphurize fly ash, wt% is: crystal water 0.5-2.0, sulphur trioxide 3.05-10.79, calcium oxide 43.10-53.96, silica 1 .87-3.67, ferric oxide 1.00-1.58, magnesium oxide 1.59-2.32, loss on ignition 29.04-34.81, chlorion 0.74-2.3.

2. a sintering desulfuration ash is applied to the method for GBFS, it is characterized in that, desulphurize fly ash is coordinated material loading from vertical mill outer circulation bucket elevator through feed weigher and spiral conveyer in the slag powders production process, the preferred proportion of desulphurize fly ash in slag powders is 0.1-2.95%, and desulphurize fly ash is processed into stockyard through jointly entering the vertical mill grinding selection by winnowing with slag powders;