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Preparation method of blast furnace slag-based composite material

A composite material and blast furnace slag technology, which is applied in the field of industrial waste slag recycling and reuse, can solve the problems of high development and utilization costs and low resource utilization efficiency of blast furnace slag, and achieve the effects of high-efficiency preparation, reduced reaction time, and reduced consumption

Active Publication Date: 2021-07-09
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a blast furnace slag-based composite material, making full use of the effective components in the blast furnace slag to prepare a blast furnace slag-based hydroxyapatite-zeolite composite material. The method has strong adaptability and simple process , convenient operation, mild reaction conditions, and high product added value, which solve the problems of high development and utilization costs and low resource efficiency of blast furnace slag existing in the prior art

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  • Preparation method of blast furnace slag-based composite material
  • Preparation method of blast furnace slag-based composite material
  • Preparation method of blast furnace slag-based composite material

Examples

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Embodiment 1

[0034] Blast furnace slag is collected from a Jiangsu Iron and Steel Co., Ltd., and its main component content is: SiO 2 29.13%, CaO47.08%, Al 2 o 3 20.59%, MgO 1.11%. The preparation steps of the blast furnace slag-based hydroxyapatite-zeolite composite material are as follows:

[0035] (1) Evenly mix blast furnace slag and sodium hydroxide at a mass ratio of 1:1.3, and melt at 600°C for 60 minutes to obtain a molten product;

[0036](2) Under the condition that the Ca / P molar ratio of the reaction system is 10:6, transfer the molten product obtained in step (1) to a three-necked flask and add 30mL 2.0mol / L disodium hydrogen phosphate solution, stir well Then, continue to add 50mL 2.0mol / L NaOH solution, stir vigorously at 100°C for 1h, and then crystallize for 6h;

[0037] (3) After the crystallization in step (2) is completed, the product is taken out and filtered, the filter cake is washed with water until neutral, and dried at 80°C for 3 hours to obtain a blast furna...

Embodiment 2

[0039] The blast furnace slag is the same as in Example 1, and the preparation steps of the blast furnace slag-based hydroxyapatite-zeolite composite material are as follows:

[0040] (1) Evenly mix blast furnace slag and sodium hydroxide particles at a mass ratio of 1:1.3, and melt at 550°C for 60 minutes to obtain a molten product;

[0041] (2) Under the condition that the Ca / P molar ratio of the reaction system is 10:6, transfer the molten product obtained in step (1) to a three-necked flask and add 30mL 2.0mol / L sodium dihydrogen phosphate solution, and stir evenly Then, continue to add 50mL 2.0mol / L NaOH solution, stir vigorously at 100°C for 2h, and then crystallize for 8h;

[0042] (3) After the crystallization in step (2) is completed, the product is taken out and filtered, the filter cake is washed with water until neutral, and dried at 80° C. for 3 hours to obtain a blast furnace slag-based hydroxyapatite-zeolite composite material. The microscopic morphology, phase...

Embodiment 3

[0044] The blast furnace slag is the same as in Example 1, and the preparation steps of the blast furnace slag-based hydroxyapatite-zeolite composite material are as follows:

[0045] (1) Evenly mix blast furnace slag and sodium hydroxide particles at a mass ratio of 1:1.2, and melt at 500°C for 120 minutes to obtain a molten product;

[0046] (2) Under the condition that the Ca / P molar ratio of the reaction system is 10:6, transfer the molten product obtained in step (1) to a three-necked flask and add 30mL 2.0mol / L sodium dihydrogen phosphate solution, and stir evenly Then, continue to add 50mL 2.0mol / L NaOH solution, stir vigorously at 100°C for 2h, and then crystallize for 6h;

[0047] (3) After the crystallization in step (2) is completed, the product is taken out and filtered, the filter cake is washed with water until neutral, and dried at 80° C. for 3 hours to obtain a blast furnace slag-based hydroxyapatite-zeolite composite material. The microscopic morphology, phas...

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Abstract

The invention discloses a preparation method of a blast furnace slag-based composite material, and belongs to the technical field of recycling of industrial waste residues. The method mainly comprises the following steps: (1) alkali fusion of blast furnace slag, (2) a reaction with phosphate, and (3) hydrothermal aging to prepare the blast furnace slag-based hydroxyapatite-zeolite composite material with high added value, and comprehensive utilization of useful components in the blast furnace slag is realized. The method disclosed by the invention has the characteristics of strong adaptability, simple process, convenience in operation, mild reaction conditions, high added value of products and the like; according to the method, the blast furnace slag is used as a cheap raw material, so that the environmental problem caused by massive stockpiling of the blast furnace slag can be effectively relieved, and the construction and operation cost of a storage yard of an enterprise can be reduced to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of industrial waste slag, and mainly relates to a preparation method of a blast furnace slag-based composite material, in particular to a preparation method of a blast furnace slag-based hydroxyapatite-zeolite composite material. Background technique [0002] As the main by-product of blast furnace ironmaking, blast furnace slag is mainly composed of gangue in iron ore, ash in coke, flux and other impurities that cannot enter pig iron. With the development of my country's iron and steel industry, the discharge of blast furnace slag is increasing day by day, and a large amount of blast furnace slag is discharged and stacked. Accumulation is bound to cause the encroachment of a large amount of land resources and environmental pollution and other problems. Therefore, the discharge of blast furnace slag has become a difficult problem for iron and steel production enterprises and society. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C01B39/02B01J20/18B01J20/30C02F1/28
CPCC01B25/32C01B39/02B01J20/048B01J20/18C02F1/288C01P2004/80C01P2006/90Y02W30/50
Inventor 李昌新喻源张庆武陈婷婷
Owner NANJING UNIV OF TECH
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