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Method for producing cement by utilizing steel slag

A steel slag and cement technology, applied in cement production and other directions, can solve the problems of instability and low activity, and achieve the effects of high strength, good impermeability and low heat of hydration in the later stage.

Inactive Publication Date: 2018-07-10
SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, aiming at the deficiencies of the prior art, the present invention provides a method for producing cement by using steel slag, which solves the shortcomings of the existing steel slag cement with low activity in the early stage and instability in the later stage, thereby promoting the application of steel slag cement and reducing the pollution caused by steel slag , to increase the added value of its comprehensive utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Grind steel slag powder into steel slag powder so that its fineness meets the following requirements: 0.08mm square hole sieve, sieve allowance ≤ 0.5%; 0.045mm square hole sieve, sieve allowance ≤ 8%, and its specific surface area ≥ 400m 2 / kg; Grind low-alkali cement clinker and dihydrate gypsum until the specific surface area is 250-600m 2 / kg, then steel slag powder and ground cement clinker powder and dihydrate gypsum powder are mixed according to mass ratio steel slag powder: cement clinker powder: dihydrate gypsum powder=60: 5: 3 to get steel slag of the present invention cement.

[0018] The stability of the above-mentioned steel slag cement is tested to be qualified. Take 1263 parts by weight of steel slag cement products and mix them with 480 parts by weight of standard sand, and add admixtures of known parts by weight to make a clean slurry test block. The measured 3-day compressive strength was 22.8MPa, and the 28-day strength was 46.7MPa. The stability is...

Embodiment 2

[0020] Grind steel slag powder into steel slag powder to make the fineness meet the following requirements: 0.08mm square hole sieve, sieve allowance ≤ 0.5%; 0.045mm square hole sieve, sieve allowance ≤ 8%, and its specific surface area ≥ 400m 2 / kg; Grind general-purpose Portland cement clinker and dihydrate gypsum to a specific surface area of ​​250-600m 2 / kg, then steel slag powder and ground cement clinker powder and dihydrate gypsum powder are mixed according to mass ratio steel slag powder: cement clinker powder: dihydrate gypsum powder=65: 15: 4 to get steel slag of the present invention cement.

[0021] The stability of the above-mentioned steel slag cement is tested to be qualified. Take 1216 parts by weight of steel slag cement product and 480 parts by weight of standard sand and mix them with known admixtures by weight to make a clean slurry test block. The measured 3-day compressive strength was 23.1MPa, and the 28-day strength was 46.9MPa. The stability is qua...

Embodiment 3

[0023] Grind steel slag powder into steel slag powder to make the fineness meet the following requirements: 0.08mm square hole sieve, sieve allowance ≤ 0.5%; 0.045mm square hole sieve, sieve allowance ≤ 8%, and its specific surface area ≥ 400m 2 / kg; Grind medium-resistant sulfate cement clinker and alum stone until the specific surface area is 250-600m 2 / kg, then steel slag powder and ground cement clinker powder and alum stone powder are mixed uniformly according to mass ratio steel slag powder: cement clinker powder: alum stone powder=78: 12: 5 to get steel slag cement of the present invention.

[0024] The stability of the above-mentioned steel slag cement is tested to be qualified. Take 1254 parts by weight of steel slag cement products and mix them with 480 parts by weight of standard sand, and add admixtures of known parts by weight to make a clean slurry test block. The measured 3-day compressive strength was 23.7MPa, and the 28-day strength was 47.1MPa. The stabili...

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Abstract

The invention discloses a method for producing cement by utilizing steel slag. According to the method, steel slag is ground into steel slag powder, so that the fineness reaches the following requirements that for a 0.08 mm square hole sieve, the weight of screen residue is smaller than or equal to 0.5 percent; for a 0.045 mm square hole sieve, the weight of screen residue is smaller than or equalto 8 percent, and the specific surface area is greater than or equal to 400 m<2> / kg; cement clinkers and additives are ground to a state that the specific surface area is 250 to 600 m<2> / kg; then, the steel slag powder, the ground cement clinker powder and the additive powder are uniformly mixed according to a mass ratio of the steel slag powder to the cement clinker powder to the additive powderbeing (60 to 80):(0 to 18):(3 to 6). By using the method, the problems of environment pollution caused of steel slag piling and resource shortage in cement production can be solved; an effective pathis provided for the steel slag treatment; good economic values and social values are realized.

Description

technical field [0001] The invention relates to a method for producing cement by using steel slag, and belongs to the technical field of steel slag treatment and building materials. Background technique [0002] Steel slag is a by-product of steelmaking, and calcium oxide in steel slag mainly produces dicalcium silicate (C 2 S), tricalcium silicate (C 3 S), rhodonite (C 3 MS) and olivine (CRS) and other minerals. Steel slag contains dicalcium silicate (C 2 S) and tricalcium silicate (C 3 S), its two contents are more than 50%. The difference is that the formation temperature of steel slag is above 1560°C, while that of Portland cement clinker is around 1460°C. The formation temperature of steel slag is high, its crystallization is dense, the grains are large, and the hydration rate is slow. Some people call steel slag burnt portland cement clinker. my country has been producing steel slag cement since 1974 and applying it in construction projects. my country's natio...

Claims

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Application Information

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IPC IPC(8): C04B7/21
CPCC04B7/21Y02P40/10
Inventor 衡红罗新生夏本军尹丽麦吉昌
Owner SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD