CN87103506A

CN87103506A - As the treatment of slag of producing trass cement

Info

Publication number: CN87103506A
Application number: CN198787103506A
Authority: CN
Inventors: 陈华
Original assignee: SECOND CEMENT FACTORY YANGXIN COUNTY HUBEI PROV
Current assignee: SECOND CEMENT FACTORY YANGXIN COUNTY HUBEI PROV
Priority date: 1987-05-12
Filing date: 1987-05-12
Publication date: 1987-11-18
Also published as: CN87103506B

Abstract

A kind of treatment of slag as blended material production trass cement is to place an airduct in the slag stockyard, and is furnished with blower fan.On airduct, pile one deck slag earlier, pile one deck Wingdale again, then pile pending slag, allow slag in air, burn.The slag of handling through this law can singly be mixed for to blended material production trass cement, also can two mix the cement of producing other kinds.The intensity of the trass cement of producing, antifreeze, erosion resistance is better than slag cement, and the concrete color of preparing with this cement is a light green, is suitable for sector applications such as building.

Description

As the treatment of slag of producing trass cement

The present invention is a kind of treatment of slag, and slag is produced trass cement as blended material after present method is handled.

Utilize slag to produce trass cement, adopt already both at home and abroad as blended material.As United States Patent (USP) (US54.025(700710), US236.519(720320)) weak point such as the trass cement mentioned made by diatomite, float stone and coal ash, and it is black that these cement have color, not antifreeze, and the maintenance required time is long.United States Patent (USP) (US3.982.954(760928)) is to contain the small crystalline slag of plagioclase and pyroxene, to put into baker after crushed and dry, pulverizes again, make trass cement after the separation.This method complicated operation, defective such as power consumption is high, and there is the sulfur-bearing height in the trass cement of producing, and the activity of cement is poor, and early strength is low, thereby the application and the popularization that have hindered slag to produce cement technology as blended material.

Domesticly also produce trass cement, and listed ministerial standard (seeing GB1344-77, the GB2847-81-portland-pozzolan cement) in.But because problems such as its color, intensity, activity rationally do not solve, thereby generally not adopting, also is to mix production cement as blended material is two even adopt, and does not singly mix and produces.

Still remaining some unburned coal grain and impurity in the common slag, contained vitreum is less, and it mainly is a kind of unformed silicate, aluminium mineral material.Quartz, mullite content in the slag crystal are higher, and CaO content is low, and itself is not a kind of diving hard material just, thereby can not produce more hydrated calcium silicate gel in hydration process.As with cinder produce trass cement, then exist early strength low, curing time is long, needs that water-based is big, drying shrinkage and segregation phenomenon be serious, outward appearance is defectives such as black, and is not popular with users.

The chemical ingredients of undressed slag is as shown in table 1:

The chemical ingredients of table 1. slag (%)

Numbering	Loss on ignition	SiO ₂	Al ₂O ₃	Fe ₂O ₃	CaO	MgO	MnO	S
									C ₁	5.12	46.96	28.36	8.31	7.76	1.46	0.2	1.6
C ₂	3.51	43.08	28.36	8.39	8.77	1.63	0.3	2.4

The objective of the invention is to seek a kind of economical and practical, simple treatment of slag, make slag after this law is handled, its crystalline structure changes, and sulphur content reduces, and produces trass cement thereby can singly be mixed for to blended material.

The object of the present invention is achieved like this, blast inlet at distance airduct (1) is spread one deck slag (3) for 1 meter around end, slag upper berth one deck Wingdale (4), then with pending slag (3) heap thereon, slag utilizes the calorific value of itself to carry out secondary clacining.

Below method of the present invention is described in detail:

Place the airduct (1) of long a 2.5～3M in the slag stockyard, the diameter of airduct is 100～120mm, set up a little blower fan (2) at the blast inlet place of airduct (1), at 1 meter of the blast inlet of distance airduct (1) the thick slag (seeing accompanying drawing) of layer overlay 30cm around the end, on slag, cover the CaCO that one deck weight is approximately 2 tons Wingdale again ₃Content should be more than 95%, and its particle size diameter can not be greater than 30cm.

Put the matches of q.s in the end of airduct (1), earlier matches is ignited, rapidly with the top of escorial in airduct (1), the weight limits of at every turn stacking slag is about 15～20 tons after igniting.Gas blower is constantly to the escorial air blast, and matches promptly drives whole escorial calcining.Calcination time is relevant with the weight of institute's incinerating slag, and its pass is:

Calcining slag weight (ton): calcination time (hour)=1: 1.5.

After having calcined, escorial is pried open chilling immediately,, make it have the potential activity to stop the crystal chap.

The purpose that adds Wingdale during calcining is the control calcining temperature, prevents burning.Because contain materials such as unburned coal in the cinder, present method is exactly to utilize the calorific value of slag self to carry out incinerating.Because the existence of materials such as these unburned coals reaches as high as more than 1200 ℃ the temperature of combustion of slag, very easily produce burn-off phenomenon at the slag muck middle part, cause slag to become molten shape, the active reduction, chilling and grinding after being unfavorable for calcining, thus influenced the early strength of trass cement.Behind the layer overlay Wingdale, the incinerating top temperature can be controlled in about 1000 ℃ on slag, and major part can remain on about 800 ℃.Help improving the activity of slag like this.Generate slaked lime behind the limestone calcination simultaneously, when the preparation concrete, the slag that contains slaked lime mixes with water, produces Ca(OH) ₂, because of Ca(OH) ₂Concentration bigger, then become the alkaline medium in the slag, play excitation, impel the vitreum depolymerization in the slag, Ca ²⁺, Al ³⁺, Si ⁴⁺The plasma stripping increases, and forms gel, thereby has improved concrete early strength.So in calcination process, mix a certain amount of Wingdale, not only controlled calcining temperature, and increased the hydration and hardening material in the slag.

Slag is block mostly behind the calcining chilling, blocky slag is crushed to diameter granular less than 20mm, and it is standby promptly to can be used as blended material.

The chemical ingredients of the slag of handling through present method is as shown in table 2, and through measuring with the ISO method, its index is:

OH ^-27.34 CaO 10.70

Compressive strength rate 78.5% in 28 days

Activity assessment (+), it is qualified to represent

Contain vitreum more than 80%

Every index all meets national standard.

The Chemical Composition of the slag of table 2 after this law is handled

Loss on ignition	SiO ₂	Al ₂O ₃	Fe ₂O ₃	CaO	MgO	MnO	S
								1.05	52.16	26.13	8.71	7.29	1.70	0.14	0.2

Used slag is the mixture of tafelberg hard coal slag of 70% bituminous coal slag and 30%.

On the slag performance of slag that this law was handled and unprocessed mistake, very big difference is arranged.The trass cement of producing with these two kinds of slags and with the concrete of cement preparation also has very big difference on the performance respectively, this from table 3, table 4 as can be seen:

The proportioning (%) of four kinds of trass cements of table 3

NO1 in the table, NO2 slag are the mixture of 70% bituminous coal slag and 30% tafelberg hard coal slag.NO3, NO4 slag all are the bituminous coal slag.

The contrast experiment of four kinds of slags of table 4

From the contrast of table 3 as can be seen, use trass cement that the slag crossed through calcination processing produces intensity should other aspect of performances all than undressed.And when using the trass cement produced through burnt slag, not having drying shrinkage and segregation phenomenon to occur at concrete batching, the color of coagulating soil be a black no longer, and is light green, its grindability.

With the trass cement that the slag of handling through present method is produced, its intensity is better than slag cement.For example, our 625kg/cm of producing with the our factory ²Grog is mixed the slag or the slag of same ratio respectively, carries out the physical strength experiment, and it the results are shown in Table 4.

The different cement intensity simultaneous tests of table 4

From the intensity contrast of table 4, obviously find out; can produce cement to replace granulated blast-furnace slag fully through the slag that present method was handled; and the intensity in cement each length of time of producing also all is higher than slag cement, and this is with regard to the slag that the has solved present operating mine slag cement problem that supply falls short of demand.And the antifreeze and erosion resistance of this trass cement also is better than slag cement.Replace slag to make blended material with slag simultaneously and produce cement, make the reduction per ton of cement unit price more than 15 yuan, its economic benefit is quite obvious.

Accompanying drawing, slag calcining synoptic diagram.

Method of the present invention is economical and practical, and is simple. No matter be Industrial Boiler, civil boiler, or the slag of other boilers can be processed with this method. The slag of processing through this method can singly be mixed for to composite material production pozzolan cement, also can two mix the cement of producing other kinds, and the early strength height of cement, and production cost is low. The concrete color that makes is light green, is suitable for the sector applications such as building.

Claims

1, a kind of treatment of slag of producing trass cement as blended material, it is characterized in that treatment process is: the blast inlet at distance airduct [1] is spread one deck slag [3] for 1 meter around end, slag upper berth one deck Wingdale [4], then with pending slag [3] heap thereon, slag utilizes the calorific value of itself to carry out secondary clacining.

2, treatment of slag according to claim 1, it is characterized in that, the blast inlet place of airduct (1) is furnished with blower fan (2), and the calcining temperature of slag is controlled at 800～1000 ℃, the calcining slag weight (ton) and calcination time (hour) ratio be 1: 1.5.

3, treatment of slag according to claim 2 is characterized in that should prying open chilling immediately after the slag calcining, and is ground into diameter granular less than 20cm.

4, according to claim 1,2 described treatment of slag, it is characterized in that the slag thickness that airduct (1) is covered with is 30cm on every side, the weight of shop Wingdale is about 2 tons.

5, treatment of slag according to claim 4 is characterized in that, airduct (1) is a metal tube, and its length is 2.5～3M, and diameter is 100～120mm.

6, treatment of slag according to claim 4 is characterized in that, the CaCO in the Wingdale ₃Content should be more than 95%, and its particle size diameter can not be greater than 30cm.

7,, it is characterized in that the handled slag of this law can be the slag of Industrial Boiler, civil boiler or other boilers according to claim 1,2 or 3 described treatment of slag.