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A kind of ferronickel slag aggregate concrete

A nickel-iron slag and concrete technology, applied in the field of nickel-iron slag aggregate concrete, can solve the problems of high crushing value of nickel-iron slag aggregate, limited utilization of nickel-iron slag, alkali aggregate reaction, etc. Risk-reducing, hydration-promoting effects

Active Publication Date: 2021-09-24
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the water quenching process of the ferronickel slag, more pores are left in the ferronickel slag, which makes the crushing value of the ferronickel slag aggregate higher
In addition, due to the effect of water quenching, the surface activity of ferronickel slag particles is high, so that when ferronickel slag is used as aggregate, there is a risk of alkali-aggregate reaction, resulting in cracking of concrete
At present, there is no solution to the two problems of high crushing value of ferronickel slag aggregate and the risk of potential alkali-aggregate reaction. Therefore, the utilization of ferronickel slag in concrete is limited

Method used

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  • A kind of ferronickel slag aggregate concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Ferronickel slag aggregate modification:

[0020] 1) Pre-crushing the coarse nickel-iron slag ore, and then sieving the broken aggregate into two parts larger than 5mm and smaller than 5mm, and grinding the part smaller than 5mm until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0021] 2) Soak the part larger than 5mm in 0.5% hydrochloric acid solution for 10 hours;

[0022] 3) Calcium hydroxide is added to the solution in step 2), and the pH value of the solution is adjusted to be greater than 7;

[0023] 4) Sieve and dry the aggregate larger than 5mm, and use it as concrete coarse aggregate;

[0024] 5) Dry the sediment less than 5mm and grind it until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0025] 6) Keep the soaking solution.

[0026] Preparation of ferronickel slag aggregate concrete:

[0027] Take 30% of the 1.2mm~5mm ferronickel slag fine aggregate, 20% of the machine-made sa...

Embodiment approach 2

[0033] Ferronickel slag aggregate modification:

[0034] 1) Pre-crushing the coarse nickel-iron slag ore, and then sieving the broken aggregate into two parts larger than 5mm and smaller than 5mm, and grinding the part smaller than 5mm until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0035] 2) Soak the part larger than 5mm in 1.5% sulfuric acid solution for 3 hours;

[0036] 3) Calcium hydroxide is added to the solution in step 2), and the pH value of the solution is adjusted to be greater than 7;

[0037] 4) Sieve and dry the aggregate larger than 5mm, and use it as concrete coarse aggregate;

[0038] 5) Dry the sediment less than 5mm and grind it until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0039] 6) Keep the soaking solution.

[0040] Preparation of ferronickel slag aggregate concrete:

[0041] Take 10% of 1.2mm~5mm ferronickel slag fine aggregate, 20% of machine-made sand fine aggre...

Embodiment approach 3

[0047] Ferronickel slag aggregate modification:

[0048] 1) Pre-crushing the coarse nickel-iron slag ore, and then sieving the broken aggregate into two parts larger than 5mm and smaller than 5mm, and grinding the part smaller than 5mm until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0049] 2) Soak the part larger than 5mm in 1.5% formic acid solution for 3 hours;

[0050] 3) Calcium hydroxide is added to the solution in step 2), and the pH value of the solution is adjusted to be greater than 7;

[0051] 4) Sieve and dry the aggregate larger than 5mm, and use it as concrete coarse aggregate;

[0052]5) Dry the sediment less than 5mm and grind it until the specific surface area is greater than 450m 2 / kg, used as concrete admixture;

[0053] 6) Keep the soaking solution.

[0054] Preparation of ferronickel slag aggregate concrete:

[0055] Take 10% of 1.2mm~5mm ferronickel slag fine aggregate, 10% of machine-made sand fine aggregat...

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Abstract

The invention discloses a nickel-iron slag aggregate concrete. The concrete is prepared by mixing the following raw materials in parts by mass: 100-150 parts of cement, 100-200 parts of lithium slag powder, 1500-1800 parts of nickel-iron slag aggregate, nickel Iron slag powder 100~300 parts, water reducer 5~20 parts, polymer emulsion 30~50 parts, mixing water 120~150 parts. The invention improves the crushing value of the ferronickel slag aggregate through the pretreatment of the ferronickel slag aggregate, and reduces the risk of potential alkali aggregate reaction of the ferronickel slag aggregate concrete. At the same time, the amount of cement used in the present invention is small, and the alkalinity of lithium slag powder and ferronickel slag powder is low. The combination of the three reduces the overall alkalinity of concrete and also reduces the risk of alkali-aggregate reaction.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a ferronickel slag aggregate concrete. 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 concrete. [0003] Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B5/00C04B24/42C04B18/14
CPCC04B5/00C04B28/00C04B40/0039C04B2201/52C04B18/04C04B18/144C04B14/06C04B24/2641C04B24/42C04B22/00C04B2103/302Y02W30/91
Inventor 李保亮黄昉刘宇翼陈亚东陈胜丁百湛刘洋
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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