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A kind of ferronickel slag cementitious material and preparation technology thereof

A cementitious material, the technology of ferronickel slag, which is applied in the field of cement prepared from ferronickel slag and its preparation, can solve the problems of low heat of hydration and resistance to sulfate corrosion, achieve good performance of sulfate corrosion resistance, and reduce CO2 emissions , the effect of efficient resource utilization

Active Publication Date: 2020-05-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a ferronickel slag cementitious material and its preparation process, which can effectively solve the environmental problems caused by the stacking of ferronickel slag, realize efficient resource utilization of ferronickel slag, and at the same time, effectively reduce the impact of Portland cement production on Consumption of non-renewable resources, reduction of CO in the cement preparation process 2 The amount of emissions is reduced by replacing Portland cement clinker with nickel-iron slag low-temperature clinker to produce cementitious materials. At the same time, the prepared nickel-iron slag low-temperature cementitious material has the characteristics of low hydration heat and good sulfate corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Nickel-iron slag low-temperature clinker and its preparation: in parts by mass, 30 parts of nickel-iron slag with 5% sieved by 80 μm square hole sieve, 15 parts of quicklime with 5% sieved by 80 μm square hole sieve, 4.5 parts by 80 μm square hole sieve % of hemihydrate gypsum (as SO 3 total) 1 part, water 10 parts, caustic soda 0.4 part; after measuring, add caustic soda into water, stir until completely dissolved, then add ferronickel slag, quicklime and hemihydrate gypsum, stir evenly, and form balls into balls, The ball diameter is φ7~φ10 mm; put the ball in a hydrothermal kettle at 180°C and 1.1MPa, and autoclave it for 6 hours; at 850°C, calcinate it for 3 hours, quench it with compressed air, and sift the remaining 4.8 through an 80μm square hole sieve after grinding %.

[0040] Weigh 40 parts of Portland cement clinker, 60 parts of ferronickel slag low temperature clinker, hemihydrate gypsum (as SO 3 Total) 1.6 parts, the 80 μm square hole sieve of each compon...

Embodiment 2

[0043] Nickel-iron slag low-temperature clinker and its preparation: in terms of mass parts, 28 parts of nickel-iron slag with 4.6% sieved by 80 μm square hole sieve, 10 parts of quicklime with 4.5% sieved by 80 μm square hole sieve, dihydrate gypsum (as SO 3 total) 0.5 parts, water 8 parts, caustic soda 0.2 parts; after measuring, add caustic soda into water, stir until completely dissolved, then add ferronickel slag, quicklime and dihydrate gypsum, stir evenly, and form balls into balls, Ball diameter φ7~φ10 mm; autoclave the ball in 160°C, 1.0MPa water heating kettle for 5 h; calcine at 800°C for 2.5 h, quench with compressed air, and sieve the remaining 5 through 80 μm square hole sieve after grinding %.

[0044] Weigh 40 parts of Portland cement clinker, 60 parts of ferronickel slag low-temperature clinker, dihydrate gypsum (in the form of SO 3 Total) 1.6 parts, the 80 μm square hole sieve of each component is not more than 5%, and the components are homogenized to obtai...

Embodiment 3

[0047] Nickel-iron slag low-temperature clinker and its preparation: in parts by mass, 24 parts of nickel-iron slag with 4.8% sieved by 80 μm square hole sieve, 14 parts of quicklime with 4.2% sieved by 80 μm square hole sieve, anhydrous gypsum (as SO 3 Total) 0.8 parts, water 7 parts, soda ash 0.6 parts; after measuring, add soda ash into water, stir until completely dissolved, then add ferronickel slag, quicklime and anhydrite, stir evenly, and form balls into balls. Diameter φ7~φ10 mm; autoclave the pellets in a hydrothermal kettle at 170°C and 0.9MPa for 4 h; calcinate at 700°C for 2.5 h, quench with compressed air, and sieve the remaining 3.5% through an 80 μm square hole sieve after grinding .

[0048] Weigh 50 parts of Portland cement clinker, 50 parts of ferronickel slag low-temperature clinker, anhydrous gypsum (in SO 3 Total) 2 parts, each component sieved by an 80 μm square hole sieve is no more than 5%, and the components are homogenized to obtain the ferronickel ...

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Abstract

The invention relates to a nickel iron slag gelling material and a production technology, relate to the nickel iron slag gelling material, and especially relates to cement produced by the nickel ironslag and a production method thereof. The nickel iron slag gelling material comprises the following components in parts by weight: 40-70 parts of Portland cement clinker, 30-60 parts of nickel iron slag low-temperature clinker, and 1-2 parts of gypsum, wherein the nickel iron slag low-temperature clinker comprises the following components in parts by weight: 20-30 parts of nickel iron slag, 9-15 parts of quicklime, 0.5-1 part of gypsum, 5-10 parts of water, and 0.2-0.6 parts of an alkaline electrolyte. The method can effectively solve the environment problem of stacking of nickel iron slag, realizes high-efficiency resource utilization of the nickel iron slag, and reduces CO2 discharge capacity during a cement preparation process, the nickel iron slag low-temperature clinker can substitutethe Portland cement clinker to produce the gelling material, and the produced nickel iron slag low-temperature gelling material has the characteristics of low hydration heat and good anti-sulfate erosion performance.

Description

technical field [0001] The invention relates to a nickel-iron slag cementitious material and a preparation process thereof, relating to a nickel-iron slag cementitious material, in particular to cement prepared from nickel-iron slag and a preparation method thereof. Background technique [0002] The preparation of Portland cement consumes a large amount of high-quality limestone resources, clay resources and fossil energy, and emits CO 2 , SO 2 and NO x Wait for gas. Every ton of Portland cement produced will emit about 0.65-0.9 tons of CO 2 , the CO produced directly or indirectly by the cement industry 2 Emissions, accounting for anthropogenic CO emissions 2 5%~10% of the total amount. Reducing energy consumption, resource consumption and meeting environmental protection requirements of the cement industry is an urgent task for the green, circular and low-carbon development of the cement industry. [0003] Ferronickel slag is the fourth largest industrial waste afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/345C04B7/147
CPCC04B7/147C04B7/345Y02P40/10
Inventor 张风臣张利鹏程沁灵周建利许鹏蒋涛
Owner HOHAI UNIV
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