CN1166462A - Clinker-less steel slag and slag cement - Google Patents

Abstract

The said cement is produced from steel slag, ore slag and composite excitant comprising potassium sodium silciate and anhydrous gypsum. It has its early strength and long-term strength meeting the requirements of Chinese standard, and the grade No. of produced cement products can be above Grad 425. The present invention has the advantages of simple production process, low cost and low power consumption.

Description

Clinker-less steel slag, slag cement

The present invention belongs to utilize slag, slag, does not add grog and makes cement.

Slag is the waste of steel-making, and the whole nation will be discharged more than 2,000 ten thousand tons every year, and it occupies the farmland, stops up the river course, contaminate environment.The development research that utilizes slag, slag to make cement both at home and abroad has more than 30 year history, nearly three classes of research approach approximately: (1) utilizes in the liquid steel-making slag and adds modifying agent, and then makes steel slag cement; (2) add grog, slag, slag cement; (3) no grog, slag, slag cement.

The development research of existing no grog, slag, slag cement adopts 92103180.7 patents that different exciting agents deeply develops, is correlated with to emphasize that later strength increases fast advantage separately, but to early strength situation not specified (NS); 92106614.7 patent adopts aluminum potassium silicate sodium to make exciting agent, preferably resolve the low problem of early strength though implement the back, seven days anti-folding, ultimate compression strength have surpassed national standard, but eventually because of biasing toward the use silicate material, ignored the use of sulfate mineral, thereby influenced the generation of aquation calcium sulphoaluminate in the cement, caused cement later strength instability, intensity did not reach the requirement of 42.5Mpa GB in 28 days.

The object of the invention provides a kind of no grog, slag, slag cement, can high-early-strength, and also later strength also can reach the GB requirement, and cement mark can reach more than No. 425.

Mechanism of the present invention is to adopt a kind of NEW TYPE OF COMPOSITE exciting agent, and it promotes the slag aquation earlier, inspires scoriaceous lateral reactivity simultaneously again, quickens the generation of the aquation calcium sulphoaluminate in the cement, meets the cement products that GB requires thereby generate to reach.

Technical characterictic of the present invention is:

1. basic recipe (by weight)

Slag 〉=50%

Slag≤40%

Compound activator 3-10%

2. in the above-mentioned prescription:

The active requirement of slag $\frac{\mathrm{CaO}}{\mathrm{Si}{O}_2+P_2{O}_5}>2.5$

Scoriaceous vitreum content＞85%

Compound activator is made up of (1) and (2): (1) is by potassium silicate sodium salt (SiO ₂+ K ₂O+Na ₂CO ₃) equal proportion is mixed levigately, high temperature sintering forms again; (2) be to be fired to anhydrous forming by dihydrate gypsum; (1) and (2) mix to use by 1: 2.

Advantage of the present invention:

Production technique is simple, has saved grog and has promptly reached energy saving purposes, and utilized the Iron And Steel Industry waste residue in a large number, and particularly the slag increment is used, and more great society benefit is arranged.The point of most critical is to have captured the unsolved difficult problem of prior art, make the early stage and later strength of no grog, slag, slag cement rationally to increase, the characteristics that both possessed high-early-strength, keep later strength that competent rich label is arranged again, multinomial physical and mechanical property all meets GBl3590-92 slag-slag cement national standard, and can produce the above cement products of 425#.

The utility model embodiment: 1. basic recipe (by weight):

Slag 52%

Slag 40%

Compound activator 8%2. concrete technology points:

Slag will give grinding to granularity＜10mm after fragmentation, magnetic separation;

Water ratio after the slag drying＜1%;

Compound activator mesosilicic acid k-na salt is with 2.5%, and dehydrated gyp-is with 5.5%,

Above-mentioned several raw material is through batching, accurately evenly grinding, homogenizing storage, packing, inspection

Test up to dispatching from the factory.

Cement fineness of the present invention requires more than 380m2/kg.3. the present invention produces---and 425# clinker-less steel slag, slag cement are through the test inspection

Survey, its data are as follows:

Sequence number	Specific surface area m 2/kg	Security	Denseness	Time of coagulation		Folding strength		Ultimate compression strength Mpa
										Initial set	Final set	Seven days	28 days	Seven days	28 days
				??1	????429	Qualified	?24.00	?4：02	10：02							??7.20	??7.80	?32.60	??48.90
??2	????419	Qualified	?23.50							?3：16	?9：19	??6.00	??7.30	?26.30	??45.50
				??3	????400	Qualified	?24.75	?1：16	?7：06							??6.60	??7.30	?31.40	??45.10
??4	????401	Qualified	?25.00							?1：30	10：59	??6.70	??7.00	?28.80	??47.00
				??5	????417	Qualified	?25.25	?3：42	?8：52							??7.20	??8.50	?29.10	??46.00
??6	????408	Qualified	?24.75							?3：17	?9：22	??6.50	??7.90	?24.40	??45.20
				??7	????412	Qualified	?24.50	?2：11	?7：38							??6.60	??8.40	?32.30	??49.30
??8	????411	Qualified	?24.25							?1：59	?6：54	??6.20	??7.90	?29.40	??46.00

Claims (2)

1. a clinker-less steel slag, slag cement is characterized in that:

(1) basic recipe (by weight)

Slag 〉=50%

Slag≤40%

Compound activator 3-10%;

(2) in the basic recipe:

The active requirement of slag $\frac{\mathrm{CaO}}{\mathrm{Si}{O}_2+P_2{O}_5}>2.5$

Scoriaceous vitreum content＞85%

Compound activator is made up of (1) and (2): (1) is by potassium silicate sodium salt (SiO ₂+

K ₂O+Na ₂CO ₃) equal proportion is mixed levigately, high temperature sintering forms again; (2) two

The water gypsum calcination is to anhydrous; (1) and (2) mix to use by 1: 2;

(3) cement fineness, its specific surface area is more than 380m2/kg.

2. it is characterized in that according to claims 1 described clinker-less steel slag, slag cement: the early stage and later strength of cement of the present invention all meets the GB13590-92 national standard, and can produce the cement products more than 425 labels.