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A kind of ferronickel slag-slag low hydration heat cementitious material and preparation method thereof

A low heat of hydration, cementitious material technology, applied in the direction of cement production, etc., can solve the problems of increasing the damage of concrete alkali aggregates, increasing the water demand of cementitious materials, and low activity of nickel-iron slag powder, so as to shorten steam curing. Time and drying treatment time, good resistance to sulfate attack, and efficient resource utilization

Active Publication Date: 2020-05-29
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of ferronickel slag micropowder is low, and the activity of ferronickel ore and slag is mainly improved by a large amount of activators, and the introduction of a large amount of activators (sodium tripolyphosphate, sodium cocoyl sulfate) will easily lead to alkali in the cementitious material. If the content is too high, it will increase the water demand of cementitious materials. When it is applied to concrete, it will increase the amount of water reducing agent, increase the cost, and increase the risk of concrete alkali aggregate damage; the introduction of a large amount of activator and desulfurized gypsum, the The increase of sulfate phase and sulfoaluminum (ferric) phase increases the risk of sulfate attack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of low-temperature clinker: In terms of mass parts, 40 parts of ferronickel slag with 5% sieved by 80 μm square hole sieve, 20 parts of slag with 4.7% sieved by 80 μm square hole sieve, 35 parts of quicklime with 4.5% sieved by 80 μm square hole sieve 4.5% hemihydrate gypsum (as SO 3 0.8 parts, 15 parts water, 2 parts caustic soda; Balls, the diameter of the ball material is φ10~φ15 mm; the ball material is steam-cured at 95°C for 12 hours, dried at 95°C for 2 hours, calcined at 800°C for 1 hour, and quenched with compressed air.

[0043] Weigh 46 parts of low-temperature clinker, hemihydrate gypsum (in SO 3 Total) 0.5 parts, grind together, and sieve the remaining 10% with 80 μm square hole sieve to obtain ferronickel slag-slag low heat of hydration cementitious material.

[0044] The cementitious material has an initial setting of 25 minutes and a final setting of 65 minutes; the 3d flexural strength is 3.1MPa, the 3d compressive strength is 12.5MPa; the...

Embodiment 2

[0046] Preparation of low-temperature clinker: In terms of mass parts, 20 parts of ferronickel slag with 4.5% sieved by 80 μm square hole sieve, 20 parts of slag with 5.0% sieved by 80 μm square hole sieve, 20 parts of quicklime with 4.5% sieved by 80 μm square hole sieve 5.0% anhydrous gypsum (as SO 3 total) 0.3 parts, water 8 parts, caustic soda 0.5 parts; after measuring, add caustic soda into water, stir until completely dissolved, then add ferronickel slag, slag, quicklime and anhydrite, stir evenly, form balls, and The diameter is φ10~φ15 mm; the pellets are steam-cured at 90°C for 16 hours, dried at 90°C for 3 hours, calcined at 800°C for 2 hours, and quenched with compressed air.

[0047] Weigh 49 parts of low-temperature clinker, anhydrite (in SO 3 Total) 1 part, grind together, and sieve 80% of the remaining 80μm square hole sieve to get ferronickel slag-slag low heat of hydration cementitious material.

[0048] The cementitious material has an initial setting of 3...

Embodiment 3

[0050] Preparation of low-temperature clinker: In terms of mass parts, 30 parts of ferronickel slag with 4.5% sieved by 80 μm square hole sieve, 20 parts of slag with 5.0% sieved by 80 μm square hole sieve, 30 parts of quicklime with 4.5% sieved by 80 μm square hole sieve 4.6% hemihydrate gypsum (as SO 3 total) 0.6 parts, water 12 parts, caustic soda 1 part; after measuring, add caustic soda into water, stir until completely dissolved, then add ferronickel slag, slag, quicklime and hemihydrate gypsum, stir evenly, form balls, and The diameter is φ10~φ15 mm; the pellets are steam-cured at 85°C for 24 hours, dried at 95°C for 4 hours, calcined at 700°C for 2 hours, and quenched with compressed air.

[0051] Weigh 48 parts of low-temperature clinker, hemihydrate gypsum (in SO 3 Total) 0.8 parts, grind together, and sieve the remaining 5% by 80 μm square hole sieve to obtain ferronickel slag-slag low heat of hydration cementitious material.

[0052] The cementitious material has...

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Abstract

The invention provides a nickel iron slag-mineral slag low-hydration-heat cementing material and preparation method thereof, and belongs to the field of building materials. The cementing material comprises the following substances in parts by mass: 46-49 parts of a low-temperature clinker and 0.5-1 part of gypsum, wherein the low-temperature clinker comprises the following substances in parts by mass: 20-40 parts of nickel iron slag, 20-30 parts of mineral slag, 20-35 parts of quick lime, 0.3-0.8 part of gypsum, 0.5-2 parts of a diluent and 8-15 parts of water. The efficient resource utilization of the nickel iron slag is realized, and the usage amount of Portland cement is effectively reduced. The nickel iron slag and the mineral slag are used as raw materials, and the quick-hard and low-hydration-heat cementing material which can partially replace the Portland cement is prepared. Compared with the Portland cement, the cementing material has the characteristics of quick hardening, lowhydration heat and good resistance to sulfate erosion.

Description

technical field [0001] The invention provides a ferronickel slag-slag low heat of hydration gelling material and a preparation method thereof, which is a low heat of hydration gelling material prepared from ferronickel slag and slag as raw materials and its preparation process. The material absorbs industrial waste ferronickel slag and slag, is beneficial to reducing environmental pollution caused by solid waste stacking, and belongs to the field of building materials. Background technique [0002] With the continuous development of China's nickel production technology, the production of nickel-iron alloys by pyrotechnics has become the main process. During the smelting process of ferronickel alloy, a large amount of ferronickel slag will be discharged, and the slag produced accounts for 80%~90% of the raw material quality. Ferronickel slag is the fourth largest industrial waste in my country after iron slag, steel slag and red mud . Domestic enterprises that smelt nickel-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/17
CPCC04B7/17Y02P40/10
Inventor 张风臣张利鹏程沁灵周建利许鹏蒋涛
Owner HOHAI UNIV
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