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Metallurgical Coal and Coke Testing

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Metallurgical Coal and Coke Testing SGS MINERALS SERVICES – T3 SGS 526 10-2013 METALLURGICAL COAL AND COKE TESTING RHEOLOGY, in dial divisions per minute (DDPM) of the Characteristic Arnu Dilatometer curves are stirrer rotation. generated when the piston movements CARBONIZATION, (taken as a percentage of the total original REACTIVITY, • High volatiles: 5,000 to >30,000 DDPM. coal cylinder length) are plotted against PETROGRAPHY • Medium volatiles: <200 to 20,000 the corresponding temperatures. These charts provide valuable information SGS is a global leader in coal and coke DDPM. regarding the suitability of your samples laboratory analysis. Our experienced • Low volatiles: 20 to 1,000 DDPM. for use as coking coals. staff can provide complete and impartial The Gieseler Plastometer test is useful rheological property tests on your coking in determining the plastic range of coals to ensure their quality and suitability coals, which is the difference between for your operation. Partner with SGS the initial softening and resolidification and leverage our technical capabilities temperatures. Plastic range in OC and to guarantee your coal analysis meets maximum fluidity in DDPM are key factors the global standards for quality and in determining which blends of coals will excellence. be optimal for coking. RHEOLOGICAL PROPERTIES ARNU DILATOMETER TEST Coking coals possess the ability, when The Arnu Dilatometer test is used to Sapozhnikov Test heated in the absence of air, to soften, determine the swelling properties of coal swell and then re-solidify to form a when heated under standard conditions. coherent, porous, hard coke structure. A 60 mm coal pencil, formed under SAPOZHNIKOV TEST The Gieseler Plastometer and Arnu pressure from minus 60 mesh coal, is Dilatometer tests are used to evaluate inserted into a precisely calibrated retort This test was developed in Russia in the rheological or plastic properties of tube with a graduated piston on top. The 1931 and is performed in accordance with a coal or coal blend. In addition, the sample is then placed in a furnace. The GOST 1186. The Chinese have adopted Sapozhnikov and G Caking Index tests apparatus is heated at 3°C/minute and the test (GB/T 479) with some minor are used in certain areas of the world as the movement of the piston, as the coal differences. A 100g sample of minus rheological evaluation tools. pencil shrinks and expands, is recorded. 1.5/1.6mm coal is placed into a steel capsule and pressed with the help of a The maximum dilatation value is the piston and a prescribed weight forming GIESELER PLASTOMETER TEST key parameter and for individual coals, a briquette. Heating is performed in a the highest value possible is considered For this analysis, 5 grams of minus 40 furnace with a temperature rise of 3°C/ optimal: mesh prepared coal are packed into a minute. Between 350 and 650°C, the retort barrel assembly along with a stirrer. • High volatiles: +50 to >300%. upper and lower levels of the plastic layer A constant torque is applied to the stirrer • Medium volatiles: +100 to 250%. are measured at regular intervals using and the coal is heated at 3°C/minute. As • Low volatiles: <0 to 200%. a needle amd millimeter scale. The Y the coal softens, the stirrer begins to turn. value is the maximum difference between The maximum fluidity value is expressed the upper and lower plastic layer levels expressed in mm. Y values will typically range from 5-35mm. The X value equals the percent contraction, or shrinkage, of the coal brickette during the test. X values generally range from 0-35%. Arnu Dilatometer Curve Gieseler Plastometer Curve SGS MINERALS SERVICES – T3 SGS 526 2 SGS currently performs this test in Russia SGS operates sole heated ovens in the US MOVEABLE WALL OVEN TEST and China, with new testing facilities to meet your coal testing requirements. SGS uses a moveable wall oven to coming on line in Australia and the US. accommodate your coal carbonization testing. Our 18’ oven holds a charge G CAKING INDEX TEST of 650-750 lbs of coal to test new or This test was developed in China and is modified coal blends. This oven produces performed in accordance with GB/T 5447 coke of suitable size and quantity for and ISO 15585 standards. It is used as coke physical tests such as stability, a primary met coal evaluation tool by hardness, and CRI/CSR. Wall and internal Chinese coke producers. In this test, 1g gas pressures generated during the test of minus 0.2mm coal is mixed with 5g are also measured. The movable wall anthracite and placed in a crucible. A prevents oven damage due to excess 100-115g steel weight is placed on top of expansion and/or pressure. the coal sample and then the sample is pressed for 30 seconds under a 6lk mass. The sample is rapidly coked in an electric furnace to 850°C in 15 minutes. The coked is weighed (M), placed in a small drum and rotated for 5 minutes at 50+/- 2 Sole Heated Oven rpm. The coke residue is screened at 1mm and the weight of the +1mm coke 30 LB PRESSURE TEST OVEN (PTO) (M1) is determined. The +1mm coke is then tumbled a second time, with the SGS operates a 30lb pressure test oven residue screened at 1mm and the weight with 2 computer-controlled heating of the +1mm coke (M2) is determined. programs. There is a 3-hour program Moveable Wall Oven G Caking Index = 10+((30M1+70M2/M) to determine maximum wall pressure Values typically range from 20 to >100, generated and a 7-hour program used with >85 desired. to generate coke for reactivity and after COKE PHYSICAL TESTING reaction strength testing. High coking SGS currently has the capability to pressure can damage the walls in by- Several tests are used to measure the perform this test in China, with facilities product coke ovens. SGS will use the PTO physical properties of blast furnace coke being set up in Australia and the US. as an effective screening and comparison however the ASTM, ISO Micum/IRSID tool for evaluating medium and low and JIS tumbler tests, and the coke CARBONIZATION TESTING volatile coking coals for your facility. reactivity/coke strength after reaction Pilot scale carbonization tests are used to test, are the most commonly performed. evaluate coking coals and blends prior to testing in commercial coke ovens. These COKE REACTIVITY INDEX (CRI) AND COKE tests are used to evaluate how coals and STRENGTH AFTER REACTION (CSR) coal blends will perform in by-product When coke descends in the blast coke ovens in terms of ease of pushing furnace, it is subjected to reaction with of the coke mass from the oven, coking countercurrent CO and abrasion. These pressure, and resultant coke quality. 2 concurrent processes weaken the coke and chemically react with it to produce SOLE HEATED OVEN (SHO) excess fines that can decrease the Tests done in the sole heated oven permeability of the blast furnace burden. evaluate the contraction or expansion The CRI/CSR test measures coke tendencies of coals or coal blends when reactively in carbon dioxide at elevated heated under controlled conditions. High temperatures and its strength after volatile coals generally contract and low reaction by tumbling. In the test, 200g volatile coals generally expand. The final of 3/4” x 7/8” (19 x 22 mm) sized coke coke mass must contract 8-12% for ease is reacted in a vessel with CO gas for 2 Pressure Test Oven 2 of pushing from the by-product oven. hours at 1100°C. The weight loss after the SGS MINERALS SERVICES – T3 SGS 526 3 reaction equals the CRI. The reacted coke and hardness determinations are used to determine the percentage of each is then tumbled in an I-shaped tumbler primarily in the US. ISO Micum and IRSID coal in a blend or to compare changes for 600 revolutions at 20 rpm and is then tumbler results are used mainly in Europe, in quality of individual coals or blends weighed. The weight percent of the + while the JIS tumbler data is mainly used over time. This system consists of a 3/8” coke equals the CSR. Most blast in Japan, South Korea and Brazil. Zeiss microscope and digital camera, a furnaces will require a coke with a CSR computer controlled motorized stage, greater than 60 and CRI less than 25. and software to compile and analyze PETROGRAPHIC ANALYSIS the data. The DIS gathers over 5 million ASTM STABILITY AND HARDNESS, reflectance values for a single coal and ISO MICUM/IRSID AND JIS JAPANESE COAL PETROGRAPHY over 9 million for multi-seam coals or coal blends to generate a unique reflectogram TUMBLER TESTS Coal petrography is a microscopic for each sample. Cursors can be set technique used to determine a coal’s rank to isolate the various ranks of coal in a (degree of coalification) and type (amount blend and determine their corresponding and category of macerals) on polished percentages specimens of minus 20 mesh prepared coal. Petrography is primarily used as a tool to evaluate bituminous coals and coal COKE AND BY-PRODUCT PETROGRAPHY blends in terms of their ability to produce blast furnace coke. Rank is determined by measuring the percent light reflectance of the maceral vitrinite. Type is determined using a point count procedure to obtain the volume percent of the various coal macerals, or fossilized plant remains. Coal petrography can also be used to determine whether contaminants are present in the coal and to detect oxidized coal in the sample. CRI / CSR Furnace and Controller DIGITAL IMAGING SYSTEM (DIS) These coke tumbler tests measure the SGS uses a digital imaging system (DIS) resistance of coke to impact and abrasion Digital Imaging System during removal from the coke oven and transportation, and the abrasion that occurs during its descent in the blast SGS provides coke petrography services furnace.
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