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A treatment process of nickel slag in the process of nickel slag concrete processing

A processing and treatment technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of poor abrasiveness of nickel slag, low performance of concrete application, and durability of concrete. Achieve the effect of improving ball milling efficiency, prolonging service life and reducing wear

Active Publication Date: 2019-04-19
江苏中鼎建材集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Processing problems caused by poor wearability of nickel slag;
[0005] (2) Low concrete application performance caused by low nickel slag hydration activity;
[0006] (3) Concrete durability problems caused by high magnesium oxide content in nickel slag

Method used

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  • A treatment process of nickel slag in the process of nickel slag concrete processing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A process for treating nickel slag in the nickel slag concrete processing process, the specific steps are:

[0031] 1) Grinding refinement treatment: first put nickel slag into a new type of high-efficiency grinding and demagnetization mechanism, perform pre-grinding, first iron removal, final grinding and second iron removal to obtain nickel slag powder; Then put the nickel slag powder into the high-temperature vacuum furnace, heat it to 200°C, adjust the vacuum degree to 0.05Pa, and keep it for 5 minutes; then pass nickel vapor into the high-temperature vacuum furnace, control the pressure at 80Kpa, and stir for 10 minutes; then dry the nickel powder and sieving to obtain nickel slag powder with consistent particle size;

[0032] 2) Hydration activity treatment: first add CaO and SiO to the nickel slag powder obtained in step 1) 2 and kaolin, stirred for 15 minutes until fully mixed; then the mixture was placed in a hydrothermal kettle, and seed crystals were added, ...

Embodiment 2

[0037] A process for treating nickel slag in the nickel slag concrete processing process, the specific steps are:

[0038] 1) Grinding refinement treatment: first put nickel slag into a new type of high-efficiency grinding and demagnetization mechanism, perform pre-grinding, first iron removal, final grinding and second iron removal to obtain nickel slag powder; Then put the nickel slag powder into the high-temperature vacuum furnace, heat it to 300°C, adjust the vacuum degree to 0.04Pa, and keep it for 8 minutes; then pass nickel vapor into the high-temperature vacuum furnace, control the pressure at 20KPa, and stir for 20 minutes; then dry the nickel powder and sieving to obtain nickel slag powder with consistent particle size;

[0039] 2) Hydration activity treatment: first add CaO and SiO to the nickel slag powder obtained in step 1) 2 and kaolin, stirred for 10 minutes until fully mixed; then the mixture was placed in a hydrothermal kettle, and seed crystals were added, ...

Embodiment 3

[0044] A process for treating nickel slag in the nickel slag concrete processing process, the specific steps are:

[0045] 1) Grinding refinement treatment: first put nickel slag into a new type of high-efficiency grinding and demagnetization mechanism, perform pre-grinding, first iron removal, final grinding and second iron removal to obtain nickel slag powder; Then put the nickel slag powder into the high-temperature vacuum furnace, heat it to 250°C, adjust the vacuum degree to 0.045Pa, and keep it for 7 minutes; then pass nickel vapor into the high-temperature vacuum furnace, control the pressure at 50KPa, and stir for 15 minutes; then dry the nickel powder and sieving to obtain nickel slag powder with consistent particle size;

[0046] 2) Hydration activity treatment: first add CaO and SiO to the nickel slag powder obtained in step 1) 2 and kaolin, stirred for 12 minutes until fully mixed; then the mixture was placed in a hydrothermal kettle, and seed crystals were added,...

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Abstract

The invention discloses a nickel slag processing technology in a nickel slag concrete manufacturing process. The processing technology specifically comprises the steps of powder grinding and refining treatment, hydration activity treatment and durability treatment. The processing technology has the advantages that abrasion of iron to a roller press can be effectively reduced via a novel high efficient powder grinding and demagnetizing mechanism, the service life of the roller press can be prolonged, and iron content in the nickel slag can be effectively removed via two times of deironing; due to the mode of introducing nickel stream into a high-temperature vacuum furnace, and sieving nickel powder, particle diameters of the nickel powder can be effectively controlled, the condition that the nickel slag has uniform powder particle size is ensured, and thus quality of subsequently manufactured nickel slag concrete can be further improved; formation of hydration products under a hydrothermal condition is facilitated by adjusting a CaO / SiO2 ratio, the composition of the nickel slag and kaoline and the hydrothermal condition and by using a seed crystal technology, and thus hydrate with gelling property can be acquired; minerals such as tobermorite and Mg(OH)2 are formed by using the high temperature and high pressure hydrothermal technology, and thus MgO content is effectively reduced, and durability of the nickel slag concrete is improved.

Description

technical field [0001] The invention relates to the technical field of nickel slag treatment, in particular to a process for treating nickel slag during nickel slag concrete processing. Background technique [0002] Nickel slag is an industrial waste slag discharged in the process of smelting nickel metal, the main components are FeO and SiO 2 . The main mineral phases in nickel slag are pyroxene, forsterite and a small amount of copper-nickel-iron sulfide. With the rapid development of my country's economy, my country's nickel output has increased rapidly in recent years, and the amount of nickel slag produced therefrom has also increased day by day. The stacking of waste slag in the open air not only occupies a large amount of land resources, but also contains heavy metal ions such as Ni, Co, and Cu, which cause serious pollution to the environment. According to statistics, due to the lack of reasonable utilization for a long time, the amount of nickel slag stockpiled i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/06C04B18/14
CPCC04B5/06C04B18/144Y02W30/91
Inventor 孔加春罗乃将
Owner 江苏中鼎建材集团有限公司
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