CN1057632A

CN1057632A - Sulphate cement made of steel slag

Info

Publication number: CN1057632A
Application number: CN90105483A
Authority: CN
Inventors: 文铁生; 王剑波
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-06-22
Filing date: 1990-06-22
Publication date: 1992-01-08

Abstract

The invention relates to a kind of sulphate cement made of steel slag and manufacture method thereof.The raw material of sulphate cement made of steel slag is shrend granulation slag, slag, anhydrite and Portland clinker; proportion of raw materials is anhydrite 8-14%, Portland clinker 2-6%; all the other are slag and slag (or mixing 10% volcanic ash); production method; with raw material stoving, prepare burden to scale back fine-grinding, homogenizing, packing.

Description

Sulphate cement made of steel slag

The present invention relates to a kind of sulphate cement made of steel slag and manufacture method thereof.

Slag is the waste residue of steel-making, account for 20% of output of steel, with China's output of steel in 1989 is 60,000,000 tons of calculating, the quantity discharged of slag reaches 1,200 ten thousand tons, both taken a large amount of soils, having polluted environment again, is anxious pending waste residue, and it is the fine approach that slag is fully utilized that slag is made cement.The countries in the world past attempts was made number of research projects for this reason, and China also has several families cement mill to produce steel slag cement, but all belongs to silicate-type, the Portland clinker of being mixed more (about 20%), cement mark not high (below No. 325), cost is more expensive.The patent application of the CN1030067A " blast-furnace slag cement of quick setting behavior and high-early strength " of Chinese invention patent bulletin on January 4th, 1989 and the CN1036780A " dross slag cement " that announced on November 1st, 1989 all belongs to silicate-type cement, its grog consumption more (generally at 10-20%), gypsum consumption less (generally at 2-4%), production cost is higher, the product sulphate-corrosion resistance can be poor, uses in the coastland to be subject to marine denudation.

Purpose of the present invention aims to provide that a kind of production technique is simple, production cost is low, and sulphate-corrosion resistance can be good, slag, more sulphate cement made of steel slag and the manufacture method of slag utilization.

Realize that the object of the invention technical scheme is: cement raw material comprises slag, slag, anhydrite, Portland clinker, the invention is characterized in the consumption that reduces Portland clinker, improve the consumption of anhydrite, be Portland clinker consumption 2-6%(weight %), anhydrite 8-14% slag 36-44%, slag 40-50%(or slag 30-40%, volcanic ash 0-10%), cement by this proportioning raw materials manufacturing, essential mineral is calcium sulphoaluminate, dicalcium ferrite etc., therefore belongs to sulfate type cement.

Slag among the present invention adopts shrend granulation slag; when the granulation slag is open hearth or converter steelmaking; one deck proportion on molten steel upper strata is the scum silica frost of 1.5-3; quenching forms in flowing into water; the initial stage slag of open hearth is used in general employing first, in the granulation slag owing to contain a large amount of vitreums, so have stronger hydraulically active; silica content in the granulation slag is generally low than slag, and its mineral composition mainly contains dicalcium ferrite, iron calcium aluminate, manganolite, monticellite etc.Manganese monoxide in the granulation slag can destroy orthosilicate type structure, improves Vitrea water stability in the slag, reduces the hydraulically active in the slag.Therefore, the content of manganese monoxide in the granulation slag (MnO) should be less than 1%, and P205 content should not surpass 3%, and titanium calcium stone (CT) content in the granulation slag is influential to activity, generally can not surpass 5%.

The cement that obtains with the common levigate back of slag, slag, grog and anhydrite raw material, essential mineral after the aquation of its cement is hydrated calcium silicate class material and aquation calcium sulphoaluminate class material, how much how much deciding of two kinds of material relative contents by grog and two kinds of raw material materials of gypsum, grog consumption many (10-20%), and during gypsum consumption few (＜4%), hydrated calcium silicate class material is the essential mineral of cement stone, have only a spot of aquation calcium sulfoaluminate minerals to be present in the cement stone, therefore be called the silicate-type steel slag cement.Grog consumption few (≤6%), during gypsum consumption many (8-14%), aquation calcium sulphoaluminate class material is the essential mineral of cement stone, has only a spot of hydrated calcium silicate mineral to be present in the cement stone, is vitriol shaped steel money cement.These two kinds of cement, mineralogical property is different fully, and this is the result of material by quantitative change to qualitative change.

In sulphate cement made of steel slag of the present invention, the aquation calcium sulphoaluminate is a main component, and hydrated calcium silicate only contains minor constituent, the hydrated calcium silicate mineral form early, be to form later aquation calcium sulfoaluminate minerals on every side, its volume is significant during generation expands 2.5 times, can make the concrete structure densification, improves watertightness and reduces shrinkability.

Among the present invention, a spot of Portland clinker is in order to keep certain alkalescence when the aquation, promotes calcium oxide in slag or the slag and aluminum oxide chemical combination and becomes the needs of calcium aluminate.Its principle is Portland clinker can be isolated Wingdale matter when aquation a hydroxide ion, makes solution become alkalescence.Effectively combining of promotes oxidn aluminium and calcium oxide helps the formation and the sclerosis of sulfate cement mineral (ettringite), and this effect intensifies effect alkalescence.Grog is alkaline admixture.What the control of grog incorporation should make sulphate cement made of steel slag PH=11 ± 0.5 be advisable (specifically measuring way: after 1 gram sulphate cement made of steel slag adds the 50ml boiling pure water, with the value of extensive PH PH that test paper is surveyed).

The manufacture method of sulphate cement made of steel slag of the present invention is with the oven dry of shrend granulation slag, anhydrite oven dry, blast-furnace slag oven dry, and raw material is mixed in proportion back fine-grinding, homogenizing, packing.When producing, the moisture behind control slag, the slag drying is no more than 1.5%, and the oven dry moisture of anhydrite is no more than 1%, and crystal water+attached water is no more than 3%, and the grinding fineness of raw material admixtion is specific surface area 3000～5000cm ²/ g, or 4900 hole sizers tail over and are 1.5-6%.During batching, the consumption of grog should be controlled PH=11 ± 0.5 that makes cement.

Embodiments of the invention are as follows

1, raw-material chemical ingredients

Kind

The place of production

Chemical ingredients (%)

Zo ₃S

SiO

FeO

AlO

CaO

MgO

SO

PO

Mno

Shrend steel slag water quenching slag grog anhydrite

Shaodong, steel Loudi, steel Hunan, Hunan

0.38 0.46

17.04 37.11 19.43 12.28

33.28 0.47 4.54 1.91

7.00 11.09 5.58 2.79

21.66 43.36 65.2 33.02

11.00 6.40 1.76 2.65

0.22 1.00 1.16 36.00

0.9 / / /

/ 0.1 / /

Crystal water 2.1%

2, the technological process of production

The technological process of production has been described the whole process of producing referring to accompanying drawing 1 in the accompanying drawing 1.

Annotate: contain many blooms in the shrend slag, the grid of available 5 * 5mm screens out, or handles with magnetic separation.

Numbering

Component (%)

Specific surface area cm ²/g

Stability

Consumptive use of water normal consistence %

Time of coagulation

Folding strength MPa

Ultimate compression strength MPa

Slag

Grog

Anhydrite

Initial set h:min

Final set h:min

3d

7d

28d

3d

7d

28d

1 2 3

40 40 40

43 44 45

5 5 5

12 11 10

4400 4550 4560

Qualified qualified

25.00 22.50 23.00

2:05 0:50 0:46

5:15 2:45 2:40

3.4 3.5 3.5

5.3 5.6 5.7

6.6 6.7 5.7

18.8 19.0 19.1

28.0 28.5 29.0

44.3 44.2 44.0

The cement cost that the present invention produced is cheap, production method is simple, cement performance is stable (because the grog consumption is few, so fCaO content is below 0.5% in the sulphate cement made of steel slag, just the cement of selling is exactly stabile, be particularly suitable in bulk), color is attractive in appearance, can produce label is the cement than high grade of 425#, significantly energy efficient (the coal consumption of one ton of sulphate cement made of steel slag of every production, power consumption and cost are only for producing 1/10 of one ton of ordinary Portland cement, 2/5 and 1/2), reduced the pollution of dust, handled a large amount of waste residue (slags simultaneously, slag), turn waste into wealth.

Errata

File name	Page or leaf	OK	Mistake	Correctly
					Specification sheets	2 4	5 show the 11 hurdles, the tenth hurdle, the 7th hurdle, the 5th hurdle, third column the 4th hurdle	Vitriol steel money cement ZOS SiO FeO AlO SO PO	Sulfate type steel slag cement ZOSS SiO ₂Fe ₂O ₃Al ₃O ₃SO ₃P2O ₅

Claims

1, a kind of production method of sulphate cement made of steel slag, raw material comprises slag, slag, anhydrite, Portland clinker, it is characterized in that used composition of raw materials (weight percent) scope is: slag 36-44%, slag 40-50%, anhydrite 8-14%, Portland clinker 2-6%.

Above-mentioned raw materials consumption sum is 100%.

2, sulphate cement made of steel slag according to claim 1, the content that it is characterized in that the manganese monoxide (MnO) in the slag is less than 1%, and titanium calcium stone is less than 5%, and P205 content is less than 3%.

3, slag sulfuric acid cement according to claim 1 and 2 is characterized in that slag is a shrend granulation slag.

4, sulphate cement made of steel slag according to claim 1 and 2 is characterized in that using slag 30-50%, and volcanic ash 0-10% replaces the slag of 40-50%.

5, the manufacture method of sulphate cement made of steel slag; be with shrend granulation slag, anhydrite, blast-furnace slag oven dry; cooperate the back fine-grinding to form by a certain percentage drying material; the invention is characterized in that the moisture that makes behind slag, the slag drying is no more than 1.5%; the oven dry moisture of anhydrite is no more than 1%; its crystal water+adhesive water is no more than 3%, and the grinding fineness of cement is that 4900 hole sizers tail over 1.5-6%, and specific surface area is 3000-5000cm ²/ g.