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OAO “Koks” is a Russian industrial group of several techno- logically integrated companies that produce high-quality cok- ing coal and coal concentrates, as well as metallurgical coke and pig iron. Situated in Kemerovo – the largest industrial region in Siberia – OAO “Koks” operates the second-largest coking plant in Russia. The region is well known for its extensive natural resources, and contains 67% of Russia’s coking coal reserves. The area is also rich in iron ore, and 23% of Russia’s output of rolled steel products is manufactured here. Supplying local and export markets The OAO “Koks” plant in Kemerovo produces more than 2.1 million tons of coke annually, supplying both the local iron and steel industry and export markets. As a by-product of its coke production, OAO “Koks” produces 200,000 m3 of coal tar annually. This is mainly used to produce pitch, which is widely used as a binder in manufacturing graphite electrodes. Crude coal tar from the coke oven gas purification plant con- tains up to 10% ammoniacal water and 15% suspended solids. These solids must be removed to make the tar suffi- ciently homogenous to be stored and transported without the particles settling. This is an important factor because tar is carcinogenic, and cleaning tanks manually is therefore prohib- ited in many countries. In addition, particles larger than 70 μm in diameter must be removed to prevent wear on down- stream equipment. The ammoniacal water must also be removed from the coal tar to make it suitable for distillation and for use as fuel. Producing high-quality distillate tar as a by-product can make an important contribution to the overall profits of a coke oven gas plant. Meeting demands with decanters In 2002, OAO “Koks” installed two three-phase Alfa Laval decanter centrifuges in the tar recovery section of the Kemerovo plant. These are used for dewatering the coal tar and removing solids at the same time. When legislation regarding the ash content in the tar became more stringent, Alfa Laval replaced one of these decanter centrifuges with a new model, specifically designed to meet the new requirement. This has enabled the company to mar- ket a coal tar product with guaranteed high-quality specifica- tions. Coal tar - from by-product to value product with decanter centrifuges OAO “Koks”, Kemerovo, Russia case story

Coal tar - from by-product to value product with decanter

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Page 1: Coal tar - from by-product to value product with decanter

OAO “Koks” is a Russian industrial group of several techno-logically integrated companies that produce high-quality cok-ing coal and coal concentrates, as well as metallurgical cokeand pig iron.

Situated in Kemerovo – the largest industrial region in Siberia– OAO “Koks” operates the second-largest coking plant inRussia. The region is well known for its extensive naturalresources, and contains 67% of Russia’s coking coalreserves. The area is also rich in iron ore, and 23% ofRussia’s output of rolled steel products is manufactured here.

Supplying local and export marketsThe OAO “Koks” plant in Kemerovo produces more than 2.1million tons of coke annually, supplying both the local iron andsteel industry and export markets. As a by-product of itscoke production, OAO “Koks” produces 200,000 m3 of coaltar annually. This is mainly used to produce pitch, which iswidely used as a binder in manufacturing graphite electrodes.

Crude coal tar from the coke oven gas purification plant con-tains up to 10% ammoniacal water and 15% suspendedsolids. These solids must be removed to make the tar suffi-ciently homogenous to be stored and transported without the

particles settling. This is an important factor because tar iscarcinogenic, and cleaning tanks manually is therefore prohib-ited in many countries. In addition, particles larger than 70 µmin diameter must be removed to prevent wear on down-stream equipment.

The ammoniacal water must also be removed from the coaltar to make it suitable for distillation and for use as fuel.Producing high-quality distillate tar as a by-product can makean important contribution to the overall profits of a coke ovengas plant.

Meeting demands with decantersIn 2002, OAO “Koks” installed two three-phase Alfa Lavaldecanter centrifuges in the tar recovery section of theKemerovo plant. These are used for dewatering the coal tarand removing solids at the same time.

When legislation regarding the ash content in the tar becamemore stringent, Alfa Laval replaced one of these decantercentrifuges with a new model, specifically designed to meetthe new requirement. This has enabled the company to mar-ket a coal tar product with guaranteed high-quality specifica-tions.

Coal tar - from by-product to value product with decanter centrifuges

OAO “Koks”, Kemerovo, Russia case story

Page 2: Coal tar - from by-product to value product with decanter

How to contact Alfa LavalContact details for all countries are continually updated on our website.Please visit www.alfalaval.com toaccess the information direct.

PPI00074EN 0502 Alfa Laval reserves the right to change specifications without prior notification.

“The new three-phase Alfa Laval decanter enabled us toreduce the tar ash content to below the required 0.15%”,says Mr V. A. Chumarov, head of the by-products plant. “Italso significantly improved the quality of the tar. This meanswe can now prevent the build-up of sediments in storagefacilities and railway tank cars, thus making both storage andtransport much easier.”

Decanter centrifuge – 3-phase Operation Function

Heavyliquid discharge

Solids dischargeLight liquid discharge

Flushing liquorsprays

Electrostaticprecipitator

Coke oven gas

Primary cooler

Tar phase Recycledammoniacal water

Tar solids for furtherrecovery treatment

Clarified tar

Settling tankTar solids

Ammoniacal flushing liquor

Coke ovens