The American Coal Ash Association 2022 Production and Use Survey reflects 2021 data from coal-fired power stations, which yielded 77.3 million tons of ASTM C618 Class F or Class C ash and lesser grade coal combustion products (CCP), up from 69.1 million tons the prior year. When measured against prior year figures, 2021 saw: Fly ash consumption in concrete reach…
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Continental completes portland-limestone cement migration
Sources: Summit Materials Inc., Denver; CP staff Summit Materials’ Missouri subsidiary, Continental Cement Co. LLC, has consummated a full conversion from clinker-only to portland-limestone cement output at its Hannibal plant— four months after a similar transition at a sister mill up the Mississippi River in Davenport, Iowa. The PLC is typically finished at a 90/10 clinker and ground limestone blend. …
Read MoreCemex to pilot high temperature electric device for cement kiln phase
Sources: Coolbrook B.V., The Netherlands; Cemex S.A.B. de C.V., Monterrey, Mexico; CP staff Cemex S.A.B. de C.V. is the first cement producer to announce testing of Coolbrook Roto Dynamic Heater (RDH) technology, which uses electric power to attain the 1,500-1,700°C kiln temperatures required to calcine and convert limestone and other raw feeds to clinker. At plant scale, an RDH apparatus…
Read MoreArgos USA channels carbon dioxide in cement kiln, ready mixed loop
Atlanta-based Argos USA has anchored a five-member consortium targeting a closed loop model of carbon dioxide capture and recycling in cement and concrete production. In an early-2018 demonstration, the company used CO2 from its Calera, Ala., cement plant in commercial concrete produced at its Glenwood, Ga., batch plant. That Atlanta-area ready mixed operation is among nearly 100 sites, primarily in the U.S., equipped with CarbonCure Technologies CO2 storage and injection devices. The CarbonCure process uses the greenhouse gas to promote cement hydration in high to zero slump concrete.
Read MoreCEI demonstrates aggregate blend-optimizing plant technology
CEI Enterprises has begun showing customers and prospects the first working model of its Fusion transit mixed plant, staged at its Albuquerque headquarters.
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