Utilization of Blast Furnace Slag Quenched with Water as a Source of Silicate Fertilizer -I. Physico-chemical and Mineralogical Characteristics

급랭광재(急冷鑛滓)의 비료화(肥料化)에 관(關)한 연구(硏究) -I. 급랭광재(急冷鑛滓)의 특성(特性)

  • Published : 1983.12.25

Abstract

This paper was prepared to characterize a physico-chemical and mineralogical examination on blast furnace slag as a source of silicate fertilizer, which was quenched with high pressure water stream in process of iron refinery at Pohang Iron and Steel Manufacturing Inc. Quenched slag was more coarse in particle size compared to present commercial silicate fertilizer milled from air-cooled slag and mostly generated in size of 1 to 2 mm. The total chemical composition of quenched and air-cooled slags was same but mineralogical composition was quite different. The former was composed of amorphous materials resulting in more soluble silica content, however, the latter contained dominantly crystalline minerals such as akermanite, gehlenite and wollastonite which meant less soluble ones. Latent cementing property and angular surface of gain of the slag made it difficult to apply the slag directly, however, it could be used as a source of silicate fertilizer and soil ammendment.

제철광재(製鐵鑛滓)로 부생(副生)되는 급랭광재(急冷鑛滓)를 규산질비료(珪酸質肥料) 자원(資源)으로의 활용성(活用性)을 검토(檢討)해 보고저 포철(浦鐵)(주(株))의 급랭광재(急冷鑛滓)를 공시(供試)하여 이화학적(理化學的), 광물학적(鑛物學的) 특성(特性)을 조사(調査)한 결과(結果)는 다음과 같다. 급랭광재(急冷鑛滓)의 입자(粒子)는 주(主)로 모래알 크기로(1~2mm) 부생(副生)되며 서랭광재(徐冷鑛滓)로 제조(製造)한 현(現) 시판(市販) 규산질비료(珪酸質肥料)에 비(比)하여 조립질(粗粒質)이었으며 급랭(急冷)하므로서 광물조성(鑛物組成)이 무정질(無晶質)로 서랭광재(徐冷鑛滓)의 결정광물(結晶鑛物)과 대조적(對照的)이었다. 가용성규산(可溶性珪酸) 함량(含量)은 급랭광재(急冷鑛滓)에서 높았으며 반대(反對)로 서랭광재(徐冷鑛滓)에서는 결정성광물(結晶性鑛物)인 Akermanite, Cehlenite, Wollastonite을 다량(多量) 함유(含有)하고 있어 가용규산(可溶珪酸) 함량(含量)이 낮았다. 급랭광재(急冷鑛滓)의 수경성(水硬性) 및 입자(粒子)의 모서리가 예리(銳利)하기 때문에 직접시용(直接施用)할 경우 주의(注意)를 필요(必要)로 하나 규산질비료(珪酸質肥料) 자원(資源)으로서의 활용(活用)은 가능(可能)할 것으로 사료(思料)된다.

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