KR20020052829A - A method for preparing chrome containing ores using refractory wastes - Google Patents

A method for preparing chrome containing ores using refractory wastes Download PDF

Info

Publication number
KR20020052829A
KR20020052829A KR1020000082293A KR20000082293A KR20020052829A KR 20020052829 A KR20020052829 A KR 20020052829A KR 1020000082293 A KR1020000082293 A KR 1020000082293A KR 20000082293 A KR20000082293 A KR 20000082293A KR 20020052829 A KR20020052829 A KR 20020052829A
Authority
KR
South Korea
Prior art keywords
mag
waste
refractory
cro
rdb
Prior art date
Application number
KR1020000082293A
Other languages
Korean (ko)
Inventor
전명철
김선욱
조용호
Original Assignee
신현준
재단법인 포항산업과학연구원
이구택
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 신현준, 재단법인 포항산업과학연구원, 이구택, 주식회사 포스코 filed Critical 신현준
Priority to KR1020000082293A priority Critical patent/KR20020052829A/en
Publication of KR20020052829A publication Critical patent/KR20020052829A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C04B35/047—Refractories from grain sized mixtures containing chromium oxide or chrome ore
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

PURPOSE: Provided is a manufacturing method of minerals containing Cr for refractories by recycling magnesia chrome waste bricks(RDB-63F) generated from steelmaking industry. CONSTITUTION: The manufacturing method comprises the steps of: collecting Mg-Cr waste bricks(RDB-63F), and removing impurities; grinding to a size of 325mesh; adding 1-100times(based on the weight of Mg-Cr brick powder) of H2SO4 and stirring; reacting MgO in Mg-Cr bricks with H2SO4 to form MgSO4 solution; filtering to remove MgSO4 solution, and washing; and drying to get high-Cr bricks.

Description

마그-크로 폐연와를 재활용하여 내화물용 크롬 함유 광물을 제조하는 방법 {A method for preparing chrome containing ores using refractory wastes}A method for preparing chrome containing ores using refractory wastes}

발명의 분야Field of invention

본 발명은 마그-크로(Mg-Cr) 폐연와의 재활용하여 내화물용 크롬 함유 광물을 제조하는 방법에 관한 것으로, 보다 상세하게는 제철소에서 발생하는 RDB-63F 마그-크로 폐연와를 재활용하여 내화물용 크롬 함유 광물을 제조하는 방법에 관한 것이다.The present invention relates to a method for producing refractory chromium-containing minerals by recycling with Mg-Cr waste smoke, and more particularly, to recycle RDB-63F mag-chrome waste smoke produced in steel mills. A method for producing a containing mineral.

종래 기술Prior art

일반적으로 제철소 제강용 전기 정련로에서는 로내벽의 작업 내화물로서 마그-크로계 내화물(RDB-63F)이 많이 사용되고 있다. 이들 마그-크로계 내화물들은 가혹한 정련조업에 적합한 내열성과 내식성을 보유하고 있어 정련로용 내화물로서 널리 사용되고 있다. 그러나 사용 후 남는 마그-크로 폐연와는 크롬을 함유하고 있으며, 이들 크롬이 6가 크롬으로 발생될 가능성이 높아 후처리 방법에 있어 많은 어려움이 있다.In general, Mag-Cro-based refractory (RDB-63F) is frequently used as a working refractory material in the furnace wall in an electric refining furnace for steelworks steelmaking. These mag-chromic refractory materials are widely used as refractories for refining furnaces because they possess heat resistance and corrosion resistance suitable for harsh refining operations. However, the remaining mag-chrome waste smoke after use contains chromium, and since these chromium is likely to be generated as hexavalent chromium, there are many difficulties in the post-treatment method.

현재 마그-크로 폐연와의 적합한 재활용 방법의 부재로 인해 단순매립에만의존하고 있는 실정이다. 향후 이러한 단순 매립은 매립지의 부족 및 환경오염 가능성으로 인해 점차 제약을 받는 추세이므로 보다 새로운 처리방법을 강구할 필요가 있으며, 더 나아가 이들 폐연와의 재활용에 대하여 집중적인 연구가 요청되고 있다.At present, due to the lack of a suitable recycling method with Mag-Cro waste smoke, only the simple landfill. In the future, such simple landfills are increasingly restricted due to the lack of landfills and the possibility of environmental pollution. Therefore, it is necessary to devise new treatment methods, and further, intensive research on recycling with these waste smokes is required.

본 발명은 상기한 바와 같은 문제점을 해결하기 위한 것으로서, 지금까지 단순 매립되어온 RDB-63F 마그-크로 폐연와를 재활용하여 내화물용 크롬 함유 광물을 제조하는 방법을 제공하기 위한 것이다.The present invention is to solve the problems as described above, to provide a method for producing a refractory chromium-containing minerals by recycling the RDB-63F Mag-Crowax waste that has been simply buried up to now.

상기한 본 발명의 목적을 달성하기 위하여, 본 발명은In order to achieve the above object of the present invention, the present invention

a) 마그-크로 폐연와(RDB-63F)를 선별 수집하여 불순물을 제거하는 단계;a) screening and collecting the Mag-Cro closed lead (RDB-63F) to remove impurities;

b) 상기 불순물이 제거된 마그-크로 폐연와를 적정 입도로 분쇄하는 단계;b) pulverizing the mag-cro waste waste with the impurities removed to an appropriate particle size;

c) 상기 분쇄된 마그-크로 폐연와 분말에 황산용액을 첨가하여 교반하는 단계;c) adding sulfuric acid solution to the pulverized mag-black waste smoke and powder and stirring;

d) 상기 마그-크로 폐연와에 존재하는 MgO 성분을 황산용액과 반응시켜 MgSO4용액을 형성하는 단계; 및d) reacting the MgO component present in the Mag-Cro closed lead with a sulfuric acid solution to form a MgSO 4 solution; And

e) 상기 MgSO4용액을 제거하여 크롬함량이 높은 내화물용 광물을 얻는 단계e) removing the MgSO 4 solution to obtain a refractory mineral having a high chromium content

를 포함하는 마그-크로 폐연와의 재활용하여 내화물용 크롬 함유 광물을 제조하는 방법을 제공한다.It provides a method for producing a chromium-containing mineral for refractory by recycling with waste Mag-Cro including.

이하, 본 발명을 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

본 발명의 내화물용 크롬 함유 광물의 제조방법은Method for producing a chromium-containing mineral for refractory of the present invention

a) 마그-크로 폐연와(RDB-63F)를 선별 수집하여 불순물을 제거하는 단계;a) screening and collecting the Mag-Cro closed lead (RDB-63F) to remove impurities;

b) 상기 불순물이 제거된 마그-크로 폐연와를 적정 입도로 분쇄하는 단계;b) pulverizing the mag-cro waste waste with the impurities removed to an appropriate particle size;

c) 상기 분쇄된 마그-크로 폐연와 분말에 황산용액을 첨가하여 교반하는 단계;c) adding sulfuric acid solution to the pulverized mag-black waste smoke and powder and stirring;

d) 상기 마그-크로 폐연와에 존재하는 MgO 성분을 황산용액과 반응시켜 MgSO4용액을 형성하는 단계; 및d) reacting the MgO component present in the Mag-Cro closed lead with a sulfuric acid solution to form a MgSO 4 solution; And

e) 상기 MgSO4용액을 제거하여 크롬함량이 높은 내화물용 광물을 얻는 단계를 포함한다.e) removing the MgSO 4 solution to obtain a refractory mineral having a high chromium content.

본 발명의 내화물용 크롬 함유 광물 제조시 원료로 사용되는 RDB-63F 마그-크로 폐연와는 제철소의 정련로 수리시 방출되는 것을 분리 수집한 것이다. 분리 수집된 이들 RDB-63F 폐연와는 표면에 내화물 시공시 적용한 모르타르 및 기타 이물이 붙어 있고, 또한 가동면은 정련조업시 내화물에 침투한 금속 등이 들러 붙어 있으며, 고온 진공조업으로 크롬 성분 휘발로 인하여 부분적인 변색이 발생된 것이 대부분이다. 폐연와가 원료로서 가치를 지니기 위해서는 성분의 균일성이 요구되므로 가동면의 크롬 휘발로 인한 변색층을 물리적으로 제거하고 육안으로 식별되는 조대 금속 성분을 제거한다. 일차적으로 불순물 층을 제거해 준 폐연와는 고압의 수세를 이용하여 표면에 들러붙은 내화 모르타르 불순물을 제거해 주는 것이 바람직하다.RDB-63F Mag-Cro waste smoke used as a raw material in the manufacture of chromium-containing minerals for refractory materials of the present invention is collected separately from the release of the steelworks refining. These collected and separated RDB-63F waste smokes adhered to the surface with mortar and other foreign materials applied during refractory construction, and the movable surface contains metals penetrated into the refractory during refining operation. Most discoloration has occurred. In order for waste wastes to be valuable as raw materials, uniformity of the components is required, so that the discoloration layer due to the chromium volatilization on the movable surface is physically removed and the coarse metal component identified by the naked eye is removed. It is preferable to remove the refractory mortar impurities adhering to the surface by using high pressure washing with the waste smoke which first removed the impurity layer.

불순물을 제거한 마그-크로 폐연와를 적정 입도로 분쇄한다. 분쇄 작업은 죠크러셔 및 밀 분쇄기를 이용할 수 있으며, 이에 한정되는 것은 아니다. 이때 #325 메쉬 이하의 미분말로 분쇄하는 것이 바람직하다.Mug-free waste lead is removed to an appropriate particle size. Grinding operations may use a jaw crusher and a mill grinder, but is not limited thereto. At this time, it is preferable to grind into fine powder of # 325 mesh or less.

적정 입도로 분쇄된 마그-크로 폐연와 분말을 반응 용해조에 투입하고 여기에 황산 용액을 첨가하여 교반한다. 황산 용액은 마그-크로 폐연와 분말에 대하여 1∼100 배의 중량비로 첨가하는 것이 바람직하다.The pulverized mag-black waste lead and powder ground to an appropriate particle size are added to a reaction dissolution tank, and sulfuric acid solution is added thereto and stirred. The sulfuric acid solution is preferably added in a weight ratio of 1 to 100 times with respect to mag-black waste lead and powder.

마그-크로 폐연와에 황산용액을 첨가하면 폐연와에 존재하는 MgO 성분과 황산이 반응하여 MgSO4형태로 용액중에 녹아나온다. 이 반응에 의하여 폐연와에 존재하는 MgO 성분이 제거된다. 반응이 더 이상 진행되지 않는 충분한 시간이 경과한 후 반응하지 않은 잔류물을 필터링하여 MgSO4를 포함하는 용액을 제거하고 미반응 잔류물을 얻는다. 얻어진 미반응 잔류물을 수세하여 잔류한 산을 제거한 후 건조하면 크롬 함량이 높은 내화물용 크롬 광물을 얻을 수 있다.When sulfuric acid solution is added to Mag-Cro waste lead, MgO component and sulfuric acid react in the waste lead and dissolve in solution as MgSO 4 . This reaction removes the MgO component present in the spent smoke. After a sufficient time for the reaction not to proceed further, the unreacted residue is filtered to remove the solution containing MgSO 4 and to obtain an unreacted residue. The obtained unreacted residue is washed with water to remove residual acid and dried to obtain a chromium mineral for refractory having a high chromium content.

본 발명에서 얻어지는 크롬 광물은 MgO 클링커와 적정 비율로 혼합하여 성형/소성함으로써 마그-크로 내화물의 크롬광물 원료로 사용될 수 있다.The chromium mineral obtained in the present invention may be used as a chromium mineral raw material of mag-chromic refractory material by mixing / molding in an appropriate ratio with MgO clinker.

이하, 본 발명의 이해를 돕기 위하여 바람직한 실시예를 제시한다. 그러나, 하기의 실시예는 본 발명의 이해를 돕기 위하여 제시되는 것일 뿐 본 발명이 하기하는 실시에에 한정되는 것은 아니다.Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are only presented to aid the understanding of the present invention, and the present invention is not limited to the following examples.

실시예 및 비교예Examples and Comparative Examples

실시예 1Example 1

먼저, 제철소의 정련로 수리시 방출되는 마그-크로 폐연와중 RDB-63F 연와를 분리 수집하였다. 분리 수집된 RDB-63F 폐연와의 표면에 붙어 있는 모르타르, 금속, 기타 이물질을 제거하였다. 일차적으로 불순물 층을 제거해 준 폐연와를 고압 수세하여 표면에 들러붙은 내화모르타르 불순물을 제거하였다. 수세를 거친 폐연와를 죠크러셔 및 밀 분쇄기를 이용하여 #325 메쉬 이하의 미분말로 분쇄하였다. 얻어진 폐연와 분쇄물 1000kg을 반응용해조에 투입하였다. 여기에 2톤의 진한 황산 용액을 첨가한 후 교반하였다. 폐연와에 존재하는 MgO 성분과 황산이 반응하여 MgSO4형태로 용액중에 녹아나오게 된다. 반응이 더 이상 진행되지 않는 충분한 시간이 경과한 후 반응하지 않은 잔류물을 필터 프레스로 필터링하여 MgSO4를 포함하는 용액을 제거하였다. 필터링하여 얻어진 미반응 잔류물을 2번 수세하여 잔류한 산을 제거한 후 100℃ 이상에서 건조하여 크롬함량이 40% 이상인 고급 크롬 광물 분말을 얻었다.First, the RDB-63F lead was separated and collected from the Mag-Cro closed lead released during repair of the steel mill. The mortar, metal, and other foreign matter adhering to the surface of the collected RDB-63F waste smoke were removed. The waste smoke, which first removed the impurity layer, was washed with high pressure to remove the refractory mortar impurities adhering to the surface. After washing with water, the waste lead was ground to a fine powder of # 325 mesh or less using a jaw crusher and a mill grinder. The obtained waste smoke and the pulverized product 1000 kg were put into a reaction melting tank. 2 ton of concentrated sulfuric acid solution was added thereto, followed by stirring. The sulfuric acid reacts with the MgO component present in the waste smoke and is dissolved in solution in the form of MgSO 4 . After a sufficient period of time for the reaction not to proceed further, the unreacted residue was filtered with a filter press to remove the solution containing MgSO 4 . The unreacted residue obtained by filtering was washed twice with water to remove the residual acid and dried at 100 ° C. or higher to obtain a higher chromium mineral powder having a chromium content of 40% or more.

본 발명은 단순매립에 의하여 처리되어 온 마그-크로 폐연와를 재활용함으로써 매립지의 부족, 환경오염 등의 문제를 해결할 수 있다. 또한 마그-크로 폐연와에 존재하는 MgO 성분을 황산용액과 반응시켜 제거함으로써 크롬함량이 높은 내화물용 광물을 제공할 수 있다. 이러한 크롬광물은 MgO 클링커와 적정 비율로 혼합하여 성형/소성함으로써 마그-크로 내화물의 원료로 사용될 수 있다.The present invention can solve problems such as lack of landfills, environmental pollution, etc. by recycling the waste-wax mag-chrome that has been treated by a simple landfill. In addition, it is possible to provide a refractory mineral having a high chromium content by removing the MgO component present in the mag-chrom waste lead with a sulfuric acid solution. These chromium minerals can be used as a raw material of mag-chromic refractory material by mixing / molding in an appropriate ratio with MgO clinker.

본 발명의 단순한 변형 또는 변경은 모두 이 분야의 통상의 지식을 가진 자에 의하여 용이하게 실시될 수 있으며 이러한 변형이나 변경은 모두 본 발명의 영역에 포함되는 것으로 볼 수 있다.All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (1)

a) 마그-크로 폐연와(RDB-63F)를 선별 수집하여 불순물을 제거하는 단계;a) screening and collecting the Mag-Cro closed lead (RDB-63F) to remove impurities; b) 상기 불순물이 제거된 마그-크로 폐연와를 적정 입도로 분쇄하는 단계;b) pulverizing the mag-cro waste waste with the impurities removed to an appropriate particle size; c) 상기 분쇄된 마그-크로 폐연와 분말에 황산용액을 첨가하여 교반하는 단계;c) adding sulfuric acid solution to the pulverized mag-black waste smoke and powder and stirring; d) 상기 마그-크로 폐연와에 존재하는 MgO 성분을 황산용액과 반응시켜 MgSO4용액을 형성하는 단계; 및d) reacting the MgO component present in the Mag-Cro closed lead with a sulfuric acid solution to form a MgSO 4 solution; And e) 상기 MgSO4용액을 제거하여 크롬함량이 높은 내화물용 광물을 얻는 단계e) removing the MgSO 4 solution to obtain a refractory mineral having a high chromium content 를 포함하는 내화물용 크롬 함유 광물의 제조방법.Method for producing a chromium-containing mineral for refractory comprising a.
KR1020000082293A 2000-12-26 2000-12-26 A method for preparing chrome containing ores using refractory wastes KR20020052829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020000082293A KR20020052829A (en) 2000-12-26 2000-12-26 A method for preparing chrome containing ores using refractory wastes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020000082293A KR20020052829A (en) 2000-12-26 2000-12-26 A method for preparing chrome containing ores using refractory wastes

Publications (1)

Publication Number Publication Date
KR20020052829A true KR20020052829A (en) 2002-07-04

Family

ID=27686230

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020000082293A KR20020052829A (en) 2000-12-26 2000-12-26 A method for preparing chrome containing ores using refractory wastes

Country Status (1)

Country Link
KR (1) KR20020052829A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983666B1 (en) * 2003-10-15 2010-09-24 재단법인 포항산업과학연구원 A method of preparing thermal radiation coating material from waste MgO-Cr2O3 brick

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961029A (en) * 1973-05-21 1976-06-01 Tokico Ltd. Process for recovering chromic acid solution from a waste liquor containing chromic ions
US4230677A (en) * 1978-11-30 1980-10-28 Union Carbide Corporation Recovery of Cr2 O3 from a chromium bearing solution
JPH06269764A (en) * 1993-03-22 1994-09-27 Shibata Hario Glass Kk Detoxicating treatment for solid waste containing hexavalent chromium
KR20000040961A (en) * 1998-12-21 2000-07-15 이구택 Production process of chromium oxide from magnesia-chrome wasted fireproof materials
KR20000041659A (en) * 1998-12-23 2000-07-15 이구택 Production process of aqueous magnesium sulfate solution from magnesia-chrome waste fireproof materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961029A (en) * 1973-05-21 1976-06-01 Tokico Ltd. Process for recovering chromic acid solution from a waste liquor containing chromic ions
US4230677A (en) * 1978-11-30 1980-10-28 Union Carbide Corporation Recovery of Cr2 O3 from a chromium bearing solution
JPH06269764A (en) * 1993-03-22 1994-09-27 Shibata Hario Glass Kk Detoxicating treatment for solid waste containing hexavalent chromium
KR20000040961A (en) * 1998-12-21 2000-07-15 이구택 Production process of chromium oxide from magnesia-chrome wasted fireproof materials
KR20000041659A (en) * 1998-12-23 2000-07-15 이구택 Production process of aqueous magnesium sulfate solution from magnesia-chrome waste fireproof materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983666B1 (en) * 2003-10-15 2010-09-24 재단법인 포항산업과학연구원 A method of preparing thermal radiation coating material from waste MgO-Cr2O3 brick

Similar Documents

Publication Publication Date Title
Balomnenos et al. The ENEXAL bauxite residue treatment process: industrial scale pilot plant results
JP5842592B2 (en) Reusing used magnesia carbon bricks
US5439505A (en) Treatment of steel mill waste for recycling
CN106946549A (en) A kind of converter cap brick made using the residual brick of magnesium carbon as primary raw material and production method
EP0611740B1 (en) Titanium-containing aggregate and use thereof for increasing the durability of refractory funace walls
KR101191743B1 (en) Method for Leaching Magnesium from Ferronickel Slag
US20150344363A1 (en) Titanium-Containing Aggregate, Method for its Manufacture, and Use Thereof
JPH0797638A (en) Treatment of dust kinds produced in iron works
Zheng et al. Solid waste remediation in the metallurgical industry: Application and environmental impact
KR20020052829A (en) A method for preparing chrome containing ores using refractory wastes
JP5055852B2 (en) Recovery method of iron resources
JPH01192743A (en) Production of briquette and rock wool
US5573576A (en) Method of treating steel mill waste
Teo et al. Chemical, Thermal and Phase Analysis of Malaysia’s Electric Arc Furnace (EAF) Slag Waste
KR100489196B1 (en) A method for preparing electro-fused Mg-Cr clinkers using refractory wastes
JP2013147414A (en) Method for recycling carbon-containing neutral/acid refractory and method of manufacturing
KR100580120B1 (en) Method for treatment magnesium-chromium brick
KR100497669B1 (en) A method for preparing Fe-Cr alloys using refractory wastes
JP2014095112A (en) Iron raw material
US20230219852A1 (en) Elaboration of ceramic tiles made of industrial solid wastes
KR101996946B1 (en) Method for collection of valid metal in slag
Sitko et al. Analysis of the post-production waste processing system in the metallurgical and energy industries
KR100508511B1 (en) Recycle Processing of Topedo Ladle Car Waste Refractory
CA2160832C (en) Method of treating steel mill waste
Tladi et al. Chemical, Mechanical, and Durability of Composites Developed from Aluminum Slag

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application