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Ferronickel slag magnesium phosphate binding material and application thereof

A technology of iron slag magnesium phosphate and cementitious materials, which is applied in the field of cementitious materials and nickel-iron slag magnesium phosphate cementitious materials, which can solve the problems of small dry shrinkage deformation, achieve small dry shrinkage deformation, reduce dosage, and low porosity Effect

Inactive Publication Date: 2017-05-10
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved: In order to overcome the defects of the existing technology, absorb the industrial waste ferronickel slag, realize the resource application of the ferronickel slag, reduce the amount of reburned magnesia in the magnesium phosphate cementitious material, and still ensure the obtained The cementitious material has the excellent properties of rapid hardening and early strength, high bond strength, small drying shrinkage deformation, and more compact internal structure. The invention provides a nickel-iron slag magnesium phosphate cementitious material and its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mixing ratio of ferronickel slag magnesium phosphate cementitious material: specific surface area 350m 2 / kg, 8 parts of ferronickel slag with 28% MgO content, the ferronickel slag is water quenched slag; specific area is 350m 2 / kg, 25 parts of dead-burned magnesia with MgO content of 90%; industrial grade, specific surface area 300m 2 10 parts of potassium dihydrogen phosphate per kg; industrial grade, specific surface area 300m 2 2 parts / kg borax is used as a retarder; the moisture content of each component is below 1%, and it is prepared by uniform mixing.

[0017] The initial setting time and compressive strength of the cementitious material were tested. When the water-cement ratio was 0.18, the initial setting time of the cementitious material was 50 minutes, the 3h compressive strength was 37.3MPa, and the 3d compressive strength was 58.4MPa.

Embodiment 2

[0019] Mixing ratio of ferronickel slag magnesium phosphate cementitious material: specific surface area 350m 2 / kg, 12 parts of ferronickel slag with MgO content of 28%, the ferronickel slag is water quenched slag; specific area 320m 2 / kg, 25 parts of dead-burned magnesia with MgO content of 90%; industrial grade, specific surface area 350m 2 10 parts of potassium dihydrogen phosphate per kg; industrial grade, specific surface area 350m 2 3 parts per kg of boric acid is used as a retarder; the moisture content of each component is below 1%, and it is prepared by uniform mixing.

[0020] The initial setting time and compressive strength of the cementitious material were tested. When the water-cement ratio was 0.20, the initial setting time of the cementitious material was 65 minutes, the 3h compressive strength was 22.9MPa, and the 3d compressive strength was 35.7MPa.

Embodiment 3

[0022] Mixing ratio of ferronickel slag magnesium phosphate cementitious material: specific surface area 350m 2 / kg, 6 parts of ferronickel slag with MgO content of 26%, the ferronickel slag is water-quenched slag; the specific area is 300m 2 / kg, 15 parts of dead-burned magnesia with MgO content of 90%; industrial grade, specific surface area 300m 2 8 parts / kg of ammonium dihydrogen phosphate; industrial grade, specific surface area 300m 2 1.5 parts per kg of sodium tripolyphosphate as a retarder; the moisture content of each component is below 1%, and it is prepared by uniform mixing.

[0023] The initial setting time and compressive strength of the cementitious material were tested. When the water-cement ratio was 0.16, the initial setting time of the cementitious material was 55 minutes, the 3h compressive strength was 38.1MPa, and the 3d compressive strength was 43.2MPa.

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Abstract

The invention discloses a ferronickel slag magnesium phosphate binding material and application thereof. The binding material is prepared from 6-12 parts of ferronickel slag, 12-25 parts of dead burned magnesia, 3-12 parts of phosphate and 1-10 parts of retarder. The ferronickel slag magnesium phosphate binding material is used in structural members requiring high strength in early age period and rush-repair work. The ferronickel slag magnesium phosphate binding material has the advantages of achieving rapid hardening and early strengthening, and being high in strength and small in shrinkage deformation, the interior structure is more compact, the porosity is low, and the durability including water tolerance is improved. Moreover, according to the ferronickel slag magnesium phosphate binding material, innocent treatment of the ferronickel slag is achieved, high-efficiency resource utilization of industrial waste residues is promoted, and on the premise that the mechanical properties of the binding material is guaranteed, the consumption of dead burned magnesia is reduced, the consumption of a non-renewable resource, namely magnesite, and energy loss are reduced, the production cost of the magnesium phosphate binding material is decreased, and therefore, economic benefits and environmental benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a cementitious material, in particular to a nickel-iron slag magnesium phosphate cementitious material prepared by using industrial waste nickel-iron slag, and the application of the cementitious material. Background technique [0002] Magnesium phosphate cementitious material has excellent properties such as rapid hardening, early strength, high bond strength, and small drying shrinkage deformation. As a new cementitious material, it has received more and more attention, and is suitable for components with high requirements for early strength. , Repair works, etc. Dead-burned magnesia, one of the components used in magnesium phosphate cementitious materials, is obtained by calcination of magnesite at a high temperature of about 1700°C. Due to the high calcination temperature, from the perspective of building material production technology, dead-burned magnesia is a high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B18/14
CPCC04B18/144C04B28/344C04B2201/50C04B22/066C04B22/0013C04B22/16Y02W30/91
Inventor 张风臣程沁灵赵云李娜周建利许鹏
Owner HOHAI UNIV
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