Research Highlight: Northeastern University School of Metallurgy

Shenyang City, China

Northeastern University is a public university in Shenyang, Liaoning Province with strengths in engineering and architecture. It is known for its prominent role in the information technology industry. Professor Shi Peiyang and the team from Northwestern University’s School of Metallurgy joined over 700 industry leaders at last year’s Coal Ash Asia conference and exhibition. Asian Coal Ash Association and the Institute for Technical Information for the Building Materials Industry hosted the annual event in Shuozhou City, China, last September. Below is an abstract from Prof. Shi Peiyang focusing on reducing air pollution from coal-fired power stations. Click below the abstract to discover more of his research.

The Key Technologies for Cleaning and Recycling Utilization of Desulfurized Flue Gas By-products

Abstract: Desulfurization ash is one of the by-products of dry lime flue gas desulphurization of sintering process in steel company. The utilization of the desulfurization ash is a challenge since it contains calcium sulfite, chloride-bearing phases and carbon. With rapid development of steel industry and more stringent requirement of environment supervision, reasonable treatment of desulphurized ash has become a key problem for the sustainable development of dry lime flue gas desulfurization. Therefore, realizing the comprehensive utilization of desulphurization ash plays an important role in promoting the dry flue gas desulphurization technology, and has important practical significance for the governance of haze problem. In this work, the desulfurization ash was used as a raw material for the preparation of calcium sulfate whisker via hydrothermal method. The effects of process parameters on the growth behavior of calcium sulfate whiskers were experimentally investigated, and the dissolution behavior of calcium sulfate in aqueous solution was studied. The molecular dynamics method was applied to simulate the growth habit of calcium sulfate crystal. Based on this, the modification mechanism of calcium sulfate whisker was deeply analyzed. Furthermore, the effects of the calcium sulfate whiskers before and after modification on the performance of rubber, asphalt and ceramic for centrifugal pump was characterized.

Coal Ash Asia Handbook 2018

- Shuozhou City, Shanxi Province, China

The Asian Coal Ash Association proudly welcomes its members and following industry leaders to view our 2018 Coal Ash Asia Handbook. Coal Ash Asia is China’s premier coal ash handling, processing and utilization information exchange forum. China’s role in the coal ash industry is crucial, as it maintains the top spot for most coal consumed by a populous per year. We hosted our international event in Shuozhou City, China, and welcomed top researchers and commercial enterprises to share and explore leading research and technology. Our tracks included:

1. Coal Ash Processing and High Value Utilization

• Grinding, Classifying and Superfine grinding

• Cement, Concrete, Wall Materials and Geopolymer

• High Value Utilizations: Ceramics, Cenospheres, Fillers

• Sulphoaluminate cement CalciumSulphoAluminate

      2. FGD Gypsum Utilization

• Gypsum drying and Calcination

• Construction Applications: gypsum block, board, mortar

• Agricultural applications

• High Strength Gypsum, etc

     3. Coal Gangue and Coal Chemical Residue

• Processing and Utilization

     4. Metal Extraction

• Alumina and other metal extraction best practices and methods

Please click below to download our 2018 Coal Ash Asia Handbook, with research from China’s top researchers in coal ash.

Want to join us in 2019? Register by clicking below!

Research Highlight: Shandong University

- Jinan, China

Shandong University is located in Jinan CIty, Shandong Province, in the eastern part of China.

Professor Wang Wen Long and the team at Shandong University’s National Engineering Laboratory for Coal-fired Pollutants Emission Reduction have focused on complimentary utilization, solid wastes and life cycle assessment in their latest research. The research pertaining to Sulfoaluminate cementitious material at was presented 2017’s Coal Ash Asia conference in Beijing, China. Below is the abstract from this paper.

Complementary Utilization of Red Mud, FGD Gypsum and Other Solid Wastes to Prepare Sulfoaluminate Cementitious Material

Abstract: In the utilization processes of single solid waste, some fundamental problems always exist, including small solid waste dose, high cost, poor performance and low added value of products, difficulties in market exploitation, etc. Professor Wang proposes complementary utilization of varied solid wastes. High-performance sulfoaluminate cementitious materials (SCM) were successfully prepared by using 100% industrial solid wastes (red mud, flue gas desulfurization gypsum, aluminum slag and carbide slag) in an industrial rotary kiln at 1300°C. The product performances reached as high as 39MPa ,57MPa and 76MPa for 1d, 3d and 28d compressive strength, respectively. Environment impact assessment was also conducted for this process based on life cycle theory. It was proven that using industrial solid wastes to prepare SCM could reduce total environmental burden by 38.62% compared to using conventional materials. This technological conception can promote the large-scale utilization of massive solid waste and boost green and circular development of society.

Shandong University will return at AsianCAA’s Coal Ash Asia 2018 in Shuozhou City, the fly ash utilization center of China. Click below to register for CAA2018 and network with global academic and industry leaders during 3 days of exhibitions, seminars, scenic and industry tours.

Shuozhou City: China's developing circular economy

- Shuozhou City, Shanxi Province, China

The Asian Coal Ash Association, partnering with the Institute for Technical Information for the Building Materials Industry will host the 8th annual Coal Ash Asia conference this September 12-15. Coal Ash Asia consists of three days of oral presentations, trade and services exhibition, poster exhibition, scenic and industrial tours as well as multiple networking opportunities.

Shuozhou City produces approximately 8 million tons of fly ash and 1.8 million tons of gypsum each year, and disposes of nearly 5 million tons each year into landfill.  Spreading over 145, 000 acres, China’s premier coal ash industrial park is located next to a large coal ash reservoir and is key in the country’s development of circular economy.

There are almost one hundred of coal ash based products in the park, including:

·      Ultrafine Fly Ash,

·      Fly Ash Based Flooring

·      Fly Ash Based Furniture

·      Ceramic Fiber Cotton

·      Fly Ash Based Calcium Silicate Board

·      Aluminum oxide and Hydrated silica

·      Thistle board

·      Autoclaved Fly Ash Brick,

·      Autoclaved Aerated Concrete Blocks,

·      Gypsum Based Dry Mix Mortar,

·      Lightweight Wallboard

·      Cement

·      Concrete

·      And more!

Want to download a copy of the Shuozhou Industrial Park? Enter your email below and we will email it to you (file size: 91MB)

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Thank you for your contact information. A member of our team will send you a copy of the Shuozhou Industrial Park Guide shortly.

Any further inquiries regarding the park? Please email [email protected]

Included in the guide is an overview of operations including the park’s R&D center, a collaborative effort of Peking University and the local Shuozhou government. With a combination of advanced technology, excellent equipment and innovative talents, the R&D center focuses on the development of new technologies and new products for enterprises within the industrial park. The Center has developed many new technologies and products including: Ceramic tiles and fiber cotton, foam ceramics, catalyst carriers, high strength fibers, wall materials, refractory and heat insulating materials.

This September, all attendees will have the chance to go on an in depth tour of the Shuozhou Industrial Park, and speak with park researchers, operators and managers. The delegates will be accompanied by a team of translators to assist with this exchange.

Want to learn more about participation at Coal Ash Asia 2018?

Research Highlight: Acid Extraction of Valuable Resources in Fly Ash and Various Utilizations of Acid Slag

- Beijing, China

Aluminium and rare earth mineral extraction was a well-explored topic at AsianCAA’s latest Coal Ash Asia event, in Beijing, last July.   Vice Professor Li Fang Fei, from JiLin University, shared her research pertaining to acid leaching in order to extract precious rare earth minerals. Jilin University is a key collaborator with the China Building Materials Academy (CBMA), and the Institute for Technical Information for the Building Materials Industry, our co-hosts of Coal Ash Asia. The university's chemistry department contributes essential research to the topic of waste utilization and management.  Below is Professor Li Fang Fei’s abstract, discussing her latest research.

Abstract: Fly ash is the main solid waste of power plants. After combustion, the aluminum, rare earth and other valuable resources in the raw coal are further enriched in the fly ash. That makes the high Al2O3 content in the fly ash of Inner Mongolia region (up to 50 wt % ). Aluminum, iron, gallium, and other rare earth resources in fly ash could be extracted by acid leaching process. And followed by resin separation, enrichment leaching, and crystallized purification process, various valuable resources could be successfully separated and purified to an ideal level. Such leaching method is not only applicable to the high-active CFB fly ash, but also suitable for the OF fly ash whose amount is much larger than the former. In addition, the amount of acid leaching slag of fly ash is very small, which is composed of porous SiO2 with ideal purity and highly reactivity. Such "white mud" could be produced as building materials, artificial zeolites, inorganic fibers, catalyst carriers, and other useful products, which promotes the governance and comprehensive utilization of fly ash.

Jilin University will be returning contributors to Coal Ash Asia 2018. For more information, or to register, please follow the links below. If you would like to be sent an information package regarding our event, please input your email below.

For more information on other papers from Professor Li Fang Fei, click below: