Chemical recycling of inorganic wastes by using phase separation of glass

Tokuro Nanra, Shuhei Mikami, Takuya Imaoka, Shinichi Sakida, Yoshinari Miura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.

Original languageEnglish
Pages (from-to)220-223
Number of pages4
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume116
Issue number1350
Publication statusPublished - Feb 2008

Fingerprint

slags
recycling
Phase separation
Slags
Recycling
Glass
glass
acids
Acids
elution
gelation
blasts
Coloring
Gelation
pretreatment
glass transition temperature
furnaces
Raw materials
heat treatment
Heat treatment

Keywords

  • Blast furnace slag
  • Chemicalrecyeling
  • Glass
  • Phase separation
  • Waste recycling

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Chemical recycling of inorganic wastes by using phase separation of glass. / Nanra, Tokuro; Mikami, Shuhei; Imaoka, Takuya; Sakida, Shinichi; Miura, Yoshinari.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 116, No. 1350, 02.2008, p. 220-223.

Research output: Contribution to journalArticle

@article{908434bbbdd74ff29e1a66bad994ebd4,
title = "Chemical recycling of inorganic wastes by using phase separation of glass",
abstract = "A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass{\%} SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.",
keywords = "Blast furnace slag, Chemicalrecyeling, Glass, Phase separation, Waste recycling",
author = "Tokuro Nanra and Shuhei Mikami and Takuya Imaoka and Shinichi Sakida and Yoshinari Miura",
year = "2008",
month = "2",
language = "English",
volume = "116",
pages = "220--223",
journal = "Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan",
issn = "1882-0743",
publisher = "Ceramic Society of Japan/Nippon Seramikkusu Kyokai",
number = "1350",

}

TY - JOUR

T1 - Chemical recycling of inorganic wastes by using phase separation of glass

AU - Nanra, Tokuro

AU - Mikami, Shuhei

AU - Imaoka, Takuya

AU - Sakida, Shinichi

AU - Miura, Yoshinari

PY - 2008/2

Y1 - 2008/2

N2 - A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.

AB - A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.

KW - Blast furnace slag

KW - Chemicalrecyeling

KW - Glass

KW - Phase separation

KW - Waste recycling

UR - http://www.scopus.com/inward/record.url?scp=44649193764&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=44649193764&partnerID=8YFLogxK

M3 - Article

VL - 116

SP - 220

EP - 223

JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan

JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan

SN - 1882-0743

IS - 1350

ER -