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Ferronickel slag aggregate treatment method

A treatment method, the technology of ferronickel slag, which is applied in the field of building materials, can solve the problems of high crushing value of ferronickel slag aggregate, and achieve the effects of reducing risks, promoting cement hydration, and improving cohesion

Active Publication Date: 2020-05-08
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a treatment method for the ferronickel slag aggregate, through the treatment, the pores and active components on the surface of the ferronickel slag aggregate are destroyed, and the pressure of the ferronickel slag aggregate is solved. High crushing value and potential alkali-aggregate reaction. At the same time, the ferronickel slag aggregate treated by the present invention is used as an admixture after being ground, which can improve the strength of cement concrete and improve the bond between cement and aggregate. Adhesion

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  • Ferronickel slag aggregate treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing 100 parts of ferronickel slag aggregate, 20 parts of sodium hydroxide, 50 parts of water glass, 800 parts of water, 10 parts of sodium carbonate, and 10 parts of cement powder for subsequent use;

[0025] The processing steps of ferronickel slag aggregate are as follows:

[0026] (1) Soak the ferronickel slag aggregate in the mixed aqueous solution of sodium hydroxide and water glass;

[0027] (2) Adjust the temperature of the mixed solution obtained in step (1) to 40°C and keep it warm for 6 hours;

[0028] (3) After the heat preservation is over, stir rapidly at a stirring speed of 5 rpm for 10s;

[0029] (4) Add sodium carbonate and cement powder, and stir evenly;

[0030] (5) Static precipitation for 1 hour and separation to obtain the precipitate and clarified liquid;

[0031] (6) Sieve out the ferronickel slag aggregate with a particle size greater than 5mm in the sediment, and air-dry it naturally, and use it as concrete aggregate; dry and gri...

Embodiment 2

[0033] Take by weighing 200 parts of ferronickel slag aggregate, 50 parts of sodium hydroxide, 80 parts of water glass, 1000 parts of water, 20 parts of sodium carbonate, and 30 parts of cement powder for subsequent use;

[0034] The processing steps of ferronickel slag aggregate are as follows:

[0035] (1) Soak the ferronickel slag aggregate in the mixed aqueous solution of sodium hydroxide and water glass;

[0036] (2) Adjust the temperature of the mixed solution obtained in step (1) to 60°C and keep it warm for 1 hour;

[0037] (3) After the heat preservation is over, stir rapidly at a stirring speed of 1 rpm for 60s;

[0038] (4) Add sodium carbonate and cement powder, and stir evenly;

[0039] (5) Static precipitation for 2 hours and separation to obtain the precipitate and clarified liquid;

[0040] (6) Sieve out the ferronickel slag aggregate with a particle size greater than 5mm in the sediment, and air-dry it naturally, and use it as concrete aggregate; dry and gr...

Embodiment 3

[0042] Take by weighing 120 parts of ferronickel slag aggregate, 30 parts of sodium hydroxide, 60 parts of water glass, 900 parts of water, 15 parts of sodium carbonate, and 20 parts of cement powder for subsequent use;

[0043] The processing steps of ferronickel slag aggregate are as follows:

[0044] (1) Soak the ferronickel slag aggregate in the mixed aqueous solution of sodium hydroxide and water glass;

[0045] (2) Adjust the temperature of the mixed solution obtained in step (1) to 50°C and keep it warm for 5 hours;

[0046] (3) After the heat preservation is over, stir rapidly at a stirring speed of 3 rpm for 50s;

[0047] (4) Add sodium carbonate and cement powder, and stir evenly;

[0048] (5) Static precipitation for 2 hours and separation to obtain the precipitate and clarified liquid;

[0049] (6) Sieve out the ferronickel slag aggregate with a particle size greater than 5mm in the sediment, and air-dry it naturally, and use it as concrete aggregate; dry and gr...

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Abstract

The invention discloses a ferronickel slag aggregate treatment method. The ferronickel slag aggregate treatment method comprises the steps of: (1) soaking ferronickel slag aggregate in a mixed aqueoussolution of sodium hydroxide and water glass; (2) adjusting the temperature of the mixed solution obtained in the step (1) to 40-60 DEG C, and keeping the temperature for 1-6 hours; (3) after the heat preservation is finished, quickly stirring the solution for 10-60 seconds; (4) adding sodium carbonate and cement powder, and performing uniform stirring; (5) standing and precipitating the solutionfor 1-2 hours, and performing separating to obtain precipitate and clarified liquid; and (6) screening out ferronickel slag aggregate with the particle size of more than 5mm in the precipitate, naturally air-drying the ferronickel slag aggregate to be used as concrete aggregate, drying and grinding the part with the particle size of less than 5mm in the precipitate to be used as a concrete admixture, and using the clarified liquid as alkali-activated material mixing water. Through treatment of the method, air holes and active ingredients on the surface of the ferronickel slag aggregate are destroyed, and the problems that the ferronickel slag aggregate is high in crushing value and has potential alkali aggregate reaction are solved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a modification treatment method for ferronickel slag aggregate. Background technique [0002] Ferronickel slag is an industrial by-product produced in the process of smelting laterite nickel ore at 1000~1600℃. According to its production process, it can be divided into blast furnace nickel slag and electric arc furnace nickel slag. At present, most of the nickel slag in my country is electric arc furnace nickel slag, and the smelting temperature of some manufacturers is 1000~1200℃. Due to the large amount of slag produced in nickel smelting, about 0.95 tons of nickel slag is produced per ton of laterite nickel ore smelted, and the annual output is about 30 million tons, and its utilization rate is very low, only about 12%. Currently, it is widely used One of the two directions is used as concrete aggregate, and the other is used as auxiliary cementitious material for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B18/14
CPCC04B18/144C04B40/0039C04B22/062C04B22/00C04B22/10C04B7/00Y02W30/91
Inventor 李保亮刘宇翼陈亚东刘洋丁百湛黄昉陈胜
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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