Displaying items by tag: clay
South Korea: The Korea Cement Association (KCA) says its members will increase the use of coal ash from local thermal power plants or source alternative raw materials from domestic clay mines. The decision follows a trade dispute between South Korea and Japan, according to the Aju Business Daily newspaper.
The Environment Ministry started to tighten rules concerning the import of coal ashes from Japan in August 2019 citing fears of radioactive and heavy metal contamination. Importers are now required to submit an authorised radioactive inspection report and the analysis of heavy metal components. The KCA said its members use 3.15Mt/yr of coal ash and 1.28Mt/yr is imported from Japan.
Vietnam: Kien Giang province has granted an investment licence to Siam City Cement Vietnam for a limestone and clay mining project and a clinker kiln project in Kien Luong district. Both projects have a combined investment of around US$470m, according to the Viet Nam News newspaper. The subsidiary of Thailand’s Siam City Cement Group operates five plants in the country following its acquisition of Holcim Vietnam in 2017.
Hoffmann Green Cement Technologies signs deal with Bouygues Construction to develop low carbon concrete
05 July 2019France: Hoffmann Green Cement Technologies and Bouygues Construction have signed a 30-month initial technical and commercial collaboration agreement to develop and test concrete formulations using new cement made from Hoffmann’s H-EVA technology. Hoffmann Green Cement inaugurated its pilot plant at Bournezeau, Vendée in late 2018. The unit will manufacture cement products using flash-calcined metakaolin and blast-furnace slag. Bouygues Construction is a global construction company with a presence in over 60 countries.
Bolivia: SEDEM, the government’s business development agency, has refuted accusations that a new cement plant being built in Caracollo, Oruro does not have enough water or raw materials. Patricia Ballivián, the general manager of SEDEM, presented reports from PricewaterhouseCoopers and C & C Ingeniería y Procesos defending the supplies to the unit. The reports were released in response to accusations by a local politician that the project had been poorly planned.
The reports revealed that the Empresa Publica Productiva Cementos de Bolivia’s (ECEBOL) plant will recycle the industrial portion of its water supply. It will have a supply of 4l/s and a 3.5Ml reservoir. It also has limestone, gypsum and clay reserves sufficient for the production of 100Mt of cement. These are expected to last the plant 60 years.
Portugal: Researchers at the Department of Materials Engineering and Ceramics at the University of Aveiro have developed a so-called ‘eco-cement’ that uses waste cellulose and clay. The cement type uses waste from the pulp industry such as ash and lime grains. This makes up 70% of its composition with the remaining 30% being metakaolin clay. The cement can be manufactured at room temperature reducing its energy consumption massively compared to Ordinary Portland Cement. The research team includes Manfredi Saeli, Rui Novais, Paula Seabra and João Labrincha.
Taiwan Cement reassures public about quality of cement
31 January 2019Taiwan: Taiwan Cement has reassured the public about the quality and safety standards of its cement and other products. It follows fraud charges being issued to a former government official for supplying raw materials mixed with industrial waste to the cement producer, according to the Taipei Times. Taiwan Cement says it is conducting inspections on all raw materials, including taking random samples of the top and bottom layers of delivery trucks from suppliers.
Lai Chin-kun, a former Hualien County Council speaker, secured local government contracts for his family’s companies to dispose of industrial waste, including industrial byproducts and inorganic debris from electroplating, optoelectronics and display panel manufacturers and pulp paper processing companies. Another family company won a contract with Taiwan Cement in 2010 to supply limestone, clay, sand and other raw materials required for cement production.
Prosecutors allege that when supplying raw materials to Taiwan Cement, Lai instructed company drivers to fill the bottom half of the trucks with industrial waste and place natural materials, such as clay, sand and limestone, on the top half to fool inspectors. Lai reportedly made US$14.1m from the scheme from 2010 to 2015.
France: Hoffmann Green Cement Technologies has inaugurated its pilot plant at Bournezeau, Vendée. The 50,000t/yr unit will manufacture cement products using metakaolin and blast-furnace slag, according to the L'Usine Nouvelle magazine. It says it will produce cement with reduced CO2 emissions up to 250kg/t using a flash-calcined process down from 900kg/t in the normal clinker production process. The project had investment of Euro10m.
Hoffmann Green Cement Technologies pilot plant to start commercial production in 2019
03 October 2018France: Hoffmann Green Cement Technologies’ pilot plant at Bournezeau, Vendée is set to start commercial production of low-carbon cement products in January 2019. Construction of the 50,000t/yr unit is due to be completed in October 2018 with its inauguration scheduled for late November 2018, according to Batiactu. The plant will employ 10 workers initially and this will rise to 15 – 20 as production ramps up.
The producer intends to make cement products using metakaolin and blast-furnace slag. If the pilot plant is a success it then intends to raise funds to build a 0.5Mt/yr plant.
Germany: BHS-Sonthofen and MSW Mineralstoffwerke Südwest have been awarded the German Resources Efficiency Award 2016 for their Combimix process. The German Federal Minister for Economic Affairs and Energy awarded the prize to the two companies in mid-February 2017. The process uses lime to improve raw materials yields in quarries contaminated with clay.
BHS developed the Combimix process based on their twin-shaft batch mixers and implemented it together with MSW. It uses lime to mix with clay that then undergoes a chemical reaction and this allows it to be separated from the rock in a subsequent processing step. The process allows more materials, such as limestone, to be extracted from quarries and extends the usable lifespans of such sites. In addition, previously dumped materials considered unprofitable can now be reassessed.
MSW introduced the process at its Mönsheim quarry in the summer of 2016. It allowed the company to increase its repository’s yield by 25%. To produce the same volume of the final product, it was previously necessary to extract about 620,000t/yr of limestone. At present the total is around 188,000t less, which corresponds to a relative reduction of around 30%. It helped to increase raw material efficiency from the previous level of 65 – 70% to around 93%.
“Our Combimix process holds a vast potential as it enables companies across the globe and throughout various industries to utilise resources more efficiently. In the context of rehabilitating contaminated soil, Combimix can be used to remove oil and other harmful substances. As a result, only a small fraction of the feed material needs to be dumped in hazardous waste landfills. The process is also viable for the cement industry. Here, it can be applied to processing limestone, a key ingredient that improves the burning process in rotary kilns and thus contributes to reducing fuel consumption,” said Dennis Kemmann, the managing director of BHS-Sonthofen.