CHAPTER
Iron ore and agglomerates as charge material should be resistant to abrasion. If they break into finer fractions due to impact, abrasion, compression and volume change within the furnace, the
BOND ABRASION INDEX TEST MACHINE
The Bond Abrasion Index, devised by F.C. Bond in the 1940's, quantifies the abrasivity of an ore. The index can be used to calculate metal wear rates in 911 Metallurgist is a trusted resource for practical insights, solutions, and support …
Evaluation of Dust Generation during Mechanical Wear …
the fraction of material under 0.5 mm as an abrasion index. However, in the case of the BF process and when using iron ore pellet as Fe containing charge, the dominant fraction of particles in BF flue dust is <0.063 mm.3) This suggests that the above mentioned abrasion index does not exactly indicate the dust generation tendency of pellets. J.
Hot Briquetted Iron (HBI), Steel's Most Versatile …
b. the abrasion index is a relative measure of the resistance of lump ore, agglomerates or hot briquetted iron to size degradation by abrasion, referred to as "AI" and expressed as the percentage by mass of the −500 μm fraction …
Definition and Assessment of Coal Abrasivity
The results of determining the abrasive properties of coals from a number of eastern deposits were analyzed. The abrasive properties vary over a wide range, and may depend on factors not related to the quantity and properties of abrasive particles. For different deposits, statistically significant factors are not the same. On average, the abrasion index for a …
Iron Ore Pelletizing Process: An Overview
PDF | On Jul 11, 2018, Sandra Lúcia de Moraes and others published Iron Ore Pelletizing Process: An Overview | Find, read and cite all the research you need on ResearchGate
Iron Ore Characterization Techniques in Mineral Processing
Additional physical quantities, namely the tumbler index (TI), abrasion index (AI), and shatter index (SI) that define the resistance of the ore to breakdown during various stages of different ore processing operations and transportation were also determined . While TI of greater than 70% is desired, AI should be less than 5% to ensure that the ...
Tumbler Index
(ii) Abrasion Index: It is a relative measure the degradation of iron ore by abrasion. The Tumbler Index and Aibrasion Index are determined in a tumbler test apparatus as per the Bureau of Indian Standard No. 6495.
(PDF) Optimization of pelletization process for iron ore …
temperature leads to increase reduced tumbler and abrasion index of the pellet. Figure 2(b) above ... The tumbler index increased from 93.15 to 95.38% and cold crushing strength increased from 176 ...
Effect of Lime coating of iron ore pellets on Iron production
Table 12: Tumbler and Abrasion Index (Batch I) Tumbler Index (+6.3 mm) = 89.6% . ... Iron ore pellets are used as feed stock of blast furnace with lump and sinter. Due to their uniform size range ...
Tumbler Index
The Tumbler Index is a relative measure of the resistance of the material to breakage or degradation by impact. (ii) Abrasion Index: It is a relative measure the degradation of iron ore by abrasion. The Tumbler Index and Aibrasion Index are determined in a tumbler test apparatus as per the Bureau of Indian Standard No. 6495
A New On-Line Method for Predicting Iron Ore Pellet Quality
The Abrasion Index (AI) describes fines generation from iron ore pellets, and is one of the most common indicators of pellet quality. In a typical pellet plant, dust is generated during the process and then captured.
(PDF) Variability Study of Bond Work Index and …
It is a well-known fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. In this study, a variability bysis is carried out with the Bond standard ...
The grindability and abrasive properties of South African …
The Hardgrove grindability index of the sample is expressed as follows: Hardgrove index = 6-93W + 13, where W is the weight in grams of minus 200 mesh material produced. A high Hard grove index value therefore indicates a soft coal and vice versa. All routine samples were prepared according to the prescribed method and air
ISO 3271:2015
ISO 3271:2015 specifies a method to provide a relative measure for evaluating the resistance of iron ores to size degradation by impact and abrasion. It covers the determination of the tumble …
Direct reduced iron — Determination of the tumble and …
The tumble index is expressed as the mass percentage of material greater than 6,30 mm, and the abrasion index as the mass percentage of material less than 500 µm.
Tumble used in SINTEFs tumble test (a) Picture (b) Drawing
It was found in the literature that a tumble index above 92% and an abrasion index below 6% show quite good strength for iron ore pellets for the Midrex process [21]. For C 1 A-1100 • C, the ...
Abrasivity
J.M.F. Clout, J.R. Manuel, in Iron Ore, 2015. 2.4.5.1 Abrasion properties. The Bond abrasion index (Ai) is used as a measure of the relative abrasivity of different rock materials on metal and is important to understand for process plant design and operation in crushing, ... 2.4.5.1 Abrasion properties. The Bond abrasion index ...
ASTM E279
The standard test, ASTM, E279-97, describes the procedures for determining the abrasion index of iron ore pellets and sinter using the Tumbler test. Therefore, this test cannot be overemphasized when determining the quality and endurance of the iron feedstock used in steel-making processes. In particular, the standard explains how the ...
Analysis of abrasive damage of iron ore pellets
Crushing strength and abrasion resistance. The extent of damage (abrasive and breakage) of IOPs during handling, storage, and the reduction process is strongly affected by the firing process parameters. ... First, the thin layer of iron ore resin, which covers the rotating plate, does not represent the actual IOP properties because the ...
Comminution
JK drop-weight test – Typically, 50-90 kg of ROM ore (or crushed HQ or PQ core). SMC Tests. A mass of 20 kg is usually required. Bond Abrasion Index (Ai) – sufficient mass to produce 4 x 400 g of charges of -19+12.7mm ore. Bond rod mill work index (RWi). Typically, 10-12 kg at the target crush size. Bond ball mill work index (BWi).
Optimum Pellet Basicity Desirable for Blast Furnace Operation
The stability of blast furnace process depends upon the quality of raw materials charged into the furnace. Among iron-bearing materials, pellets are an important feed material for the blast furnace operation. However, pellets exhibit swelling inside the blast furnace due to the high temperature inside the furnace, which causes dissociation of pellets and if swelling index …
Iron Ore Pelletizing Process: An Overview
The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. The fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. This chapter …
Iron Ore Pellet Dustiness Part I: Factors Affecting Dust Generation
Iron ore pellets abrade during handling and produce dust. This study was conducted to determine what factors affect pellet dustiness, and whether dustiness can be related to the abrasion index.
Characterization of DR Pellets for DRI Applications
It was found in the literature that a tumble index above 92% and an abrasion index below 6% show quite good strength for iron ore pellets for the Midrex process [21]. For C 1 A-1100 • C, the ...
Chemical, physical, thermal, textural and mineralogical studies …
The iron ores were found to have excellent physical properties exemplify with tumbler index (82 wt%–91 wt%), abrasion index (1.27wt%–4.87 wt%) and shatter index (0.87wt%–1.64 wt%). FTIR and thermal analysis were performed to …
Iron ores for blast furnace and direct reduction …
ISO 3082, Iron ores — Sampling and sample preparation procedures ISO 3310–1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth ISO 3310 –2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate ISO 11323, Iron ore and direct reduced iron — Vocabulary
IS 6495 (1984): Method of Tumbler Test for Iron Oxides: …
Kudremukh Iron Ore Co Ltd, Bangalore National Test House, Calcutta SHRI A. K. DUTTA GUPTA ( Alternate ) SRRI D. K ... 3.2 Abrasion Index - The abrasion index is a relative measure of the degradation of the material by abrasion. i i 4. TEST SAMPLE i 4.1 Gross Sample - The gross sample taken for the determination of ...
Processing of Magnetite Iron Ores–Comparing Grinding Options
These variables were investigated in regard to the Itakpe iron ore. A representative sample of 10.5kg of the iron ore was collected and milled, taking appropriate quantities to study the process variables; the effect of grinding time, fraction of mill critical speed, media-to-ore ratio and mill filling. ... predicted Bond abrasion index (Ai ...
ISO 11323:2010(en), Iron ore and direct reduced iron
b) the abrasion index is a relative measure of the resistance of lump ore (3.3), agglomerates (3.8) or hot briquetted iron (4.3) to size degradation by abrasion, referred to as AI and expressed as the percentage by mass of the −500 μm fraction generated in the test portion (5.7) after tumbling.