Cao Ngan Power Company reuses nearly 90 percent of ash and slag

15:00 | 29/05/2022 Environment

(VEN) - The Cao Ngan Thermal Power Company reuses nearly 90 percent of its ash and slag for building material to achieve the environmental protection goal set by the industry and trade sector.

Vietnam operates 25 coal-fired power plants, six of them run by the Vietnam National Coal-Mineral Industries Holding Corp. (Vinacomin). Their 2.05 million tonnes of ash and slag emissions account for 15 percent of the total.

According to the environmental protection plan for the industry and trade sector, 80 percent of the total ash, slag and gypsum generated from thermal power, chemical and fertilizer plants will be reused as production and building materials by 2025.

Ash and slag from Cao Ngan Thermal Power Plant are reused to produce unburnt bricks

The 115-megawatt (MW) coal-fired Cao Ngan power plant, for example, has been seeking partners to reuse the ash and slag generated in its production process. A company report to the Ministry of Industry and Trade’s monitoring team earlier this year showed that it has now reused more than 88 percent of the ash and slag. Of the remaining 141,599 tonnes, equivalent to 71 percent of the company’s yard capacity, 60,000 tonnes were generated before the project began.

Cao Ngan Company Director Nguyen Dinh Tuan said the plant launched its ash and slag treatment project in 2018, supplying raw material to cement and bricks plants for ground leveling activities in the northeastern province of Thai Nguyen Province. The materials were in accordance with TCVN 12249:2018 and TCVN 6882:2016 standards as a mineral additive for cement.

“The Cao Ngan Thermal Power Company is coordinating with the Institute of Materials Science and several brick factories in Thai Nguyen Province to pilot use of ash and slag as input materials for the production of unburnt materials and cement additives, and initial results are quite positive,” Tuan said.

In 2021, EVN’s 12 thermal power plants produced 7.34 million tonnes of ash and slag, selling 6.89 million tonnes, accounting for 94 percent – triple the 2015 rate.

In developed countries, 90 percent of ash and slag from plants is treated and recycled into materials useful for industry. In Vietnam, especially in its southern provinces, the figure is lower, requiring thousands of hectares of land to store the non-recycled material.

Cao Ngan Thermal Power Company Director Nguyen Dinh Tuan: Cao Ngan Thermal Power strives to develop

in a stable, sustainable and environmentally friendly manner. We operate safely and effectively to improve

competitiveness, diversify production and trading, and hire high-quality human resources.

Huong Minh