CN1082518A

CN1082518A - The slag moderate heat cement

Info

Publication number: CN1082518A
Application number: CN92108240A
Authority: CN
Inventors: 叶德敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-05
Filing date: 1992-08-05
Publication date: 1994-02-23

Abstract

The invention provides a kind of slag moderate heat cement and production technique thereof, with the waste steel slag is main raw material, mix part portland cement clinker and a small amount of additive and grind and form, the fineness of batching satisfies the 0.08mm square hole sieve and tails over and be no more than 5%, and the slag of selecting for use is that basicity is at the later stage slag more than 2.5.It had both been turned waste into wealth and had improved environmental pollution, reduced manufacture of cement cost 30～40% again, and the cement of production can reach 425 ^#～525 ^#Label, wear-resisting anti-washing away, hydration heat is low, can satisfy the requirement of mass concrete engineering, water conservancy project special engineering and common buildings, and the good social economic benefit is arranged.

Description

The slag moderate heat cement

The present invention relates to cement, particularly a kind of slag moderate heat cement.

National standard has only 275 at present ^#～325 ^#Steel slag cement does not have 425 ^#Above steel slag cement.Now detect the Chinese invention patent communique and disclose following correlation technique: 1. " novel rapid hardening steel slag cement " (CO4B7/19, CN1051159A), 2. " blast-furnace slag cement of quick setting behavior and high-early strength " (CN1030067A), 3. " dross slag cement (energy-saving) (CN1036750A); be main raw material with slag, slag all, but does not relate to the middle thermal characteristics of steel slag cement and the performance that concrete strength is higher than cement mortar strength.

The purpose of this invention is to provide a kind of novel steel slag cement and production technique thereof, this steel slag cement can reach 425 ^#～525 ^#Label, the impact-resisting wear-resisting performance is good, and the intensity height, density is big, hydration heat is low, cost is low.

Purpose of the present invention reaches with following slag moderate heat cement and production technique thereof, and it is to be that main raw material mixes part common 525 with the waste steel slag ^#Portland clinker and a small amount of additive grind and form.The proportioning that it is characterized in that each material component is:

Ordinary portland cement clinker 0.30～0.50,

Waste steel slag 0.18～0.40

Slag 0.20～0.40

Plaster stone 0.005～0.04

Fluorite 0.005～0.05

Production process is that batching → stirring → grinding → spiral shell fortune → bucket is carried → cement silo → packing.Earlier that proportioning is good plaster stone fragmentation, flushing, drying, slag is through two-stage crushing, magnetic separation, homogenizing, and the slag drying is prepared burden again.Because the early stage and the later stage dreg chemistry composition difference of steel-making are very big, must select the later stage slag for use, guaranteeing slag basicity more than 2.5, the fineness of batching must satisfy the 0.08mm square hole sieve and tail over and be no more than 5%.

Accompanying drawing is this slag moderate heat cement technological process of production functional-block diagram.

1.525 ^#Grog, 2. plaster stone, 3. fluorite, 4. slag, 5. slag, 6. fragmentation, 7. oven dry, 8. flushing, 9. magnetic separation, 10. steel scrap reclaims, 11. dryings, 12. homogenizing, 13. batchings, 14. stir, and 15, grinding, 16. spiral shells fortune, 17. buckets are carried, 18. cement silos, 19. packings.

Principle of the present invention: when slag basicity 2.0 when above, its major ingredient is Dicalcium Phosphate (Feed Grade), tricalcium silicate and tetracalcium aluminoferrite, mineral composition is near Portland clinker, and folding strength height, wear-resisting.Cement clinker, slag, slag and a small amount of additive are ground into the slag moderate heat cement by the suitable proportion cooperation, can bring into play slag intensity height, attrition resistant advantage, grog can promote the crystallisation process of hydrated calcium silicate and calcium ferrite, slag then can guarantee soundness, add a small amount of gypsum and fluorite and can improve early strength and regulate time of coagulation, also can guarantee that stable long-term strength increases simultaneously.Owing to added big steel slag, slag, made and adopting normal silicate 525 ^#Can keep lower hydration heat under the situation of grog and have the microdilatancy performance concurrently.

Cement made from steel slag with medium heat of hydration provided by the invention, have that other slag cement does not reach or the substantive characteristics of testing identity not: 1. the heat of hydration satisfies the GB200-89 standard, the 7 days heat of hydration≤293KJ/kg; 2. (concrete proportioning is cement: sand: stone=1: 1.753: 3.118) be higher than 28 days intensity of this cement mortar (by the GB177-85 standard) is 8～20% to 28 days compression strength of concrete.

Advantage of the present invention is both to turn waste into wealth, and has improved environmental pollution, reduces again manufacture of cement cost 30～40%. The cement of producing can reach 425^＃～525 ^＃Label, it is bigger to have a later strength height, intensity enhancement rate height, proportion, and wear-resisting abrasion resistance is good, the characteristics such as the heat of hydration is low, can satisfy the needs of mass concrete engineering, water conservancy project special engineering and common buildings, and production cost is low, and preferably economic benefit and social benefit are arranged.

Claims

1, a kind of slag moderate heat cement is a main raw material with the waste steel slag, mixes part ordinary portland cement clinker and a small amount of additive and makes, and it is characterized in that each proportion of raw materials is:

Ordinary portland cement clinker 0.30～0.50;

Waste steel slag 0.18～0.40;

Slag 0.20～0.40;

Plaster stone 0.005～0.04;

Fluorite 0.005～0.05.

2, a kind of slag moderate heat cement production technique comprises that batching → stirring → grinding → spiral shell fortune → bucket carries → cement silo → packing, it is characterized in that the fineness of preparing burden must satisfy the 0.08mm square hole sieve and tail over and be no more than 5%.

3, a kind of slag moderate heat cement according to claim 1 and 2 and production technique thereof, its feature also is to select for use basicity at the slag more than 2.5.