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.

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:

Research Highlight: Synthesis of High Quality Zeolites from Coal Fly Ash

- Perth, Australia

Dr. Kevin Li (Gang Li), participated in CAA2017 on behalf of the Centre for Energy, School of Mechanical & Chemical Engineering at the University of Western Australia in Perth, Australia. Dr. Li, a returning speaker to Coal Ash Asia, focused his presentation on synthesizing zeolites and necessary related conditions. The below abstract is an overview of the research presented at the conference. For more of Dr. Li’s publications and research, please click the link at the bottom of the abstract.

Abstract: Coal fly ash is a hazardous industrial waste generated from coal combustion and has been considered as an appropriate raw material for zeolite synthesis. In this study, synthesis of a high-quality type A zeolites (471m /g surface area) from fly ash at high conversion rate (98.2% aluminium and 96.5% silicon) has been achieved via a two-step alkali fusion and hydrothermal procedure. Furthermore, in preparation for production in commercials scale, up scaling of the developed synthesis process has been undertaken by using 150L reactor. More importantly, we tracked the migration of elements and quantified their distribution from fly ash to product zeolites and waste water throughout the synthesis process. Metalloid elements including arsenic and selenium, and those with strong amphoteric properties such as molybdenum were found highly mobile and mostly collected in the waste water. In comparison, less than 20% of heavy metal elements of weak amphoteric nature including copper, chromium and lead originated from the fly ash went to the waste water; the rest of these three heavy metals along with almost all of the cadmium, iron and nickel were fixed into the product zeolites. Despite the accumulation of hazardous elements in product zeolites, none of them was leachable under various harsh conditions, ensuring safe applications of such zeolites.

If you are interested in attending Coal Ash Asia 2018 in Shuozhou, please click the "CAA2018" link to register, and our event team will assist you in finding the participation that's right for you.

Autoclaved Aerated Concrete: CCPs Growth in Asia Pacific

Between 2015 and 2021, the global autoclaved aerated concrete market is expected to increase by just under $2 billion USD.  AAC is increasing in industry wide use due to its light weight and versatility. The construction material consists of fly ash and gypsum, both biproducts of burning coal to make energy, and much less costly than their alternatives, sand and anhydrite.  The material also consists of lime, cement, and aluminum powder. Construction companies are increasing their use of this material as it is not only more cost efficient, but also provides wider durability to seismic fluctuation, intense heat, and pests. The material itself also saves the manufacturer or construction company in water and energy usage.  Autoclaved aerated concrete is widely used in Europe and North America.

AAC materials can either be used instead of or to repair common building materials. Application can be seen in most real estate areas including residential, industrial and commercial. However, the majority of the AAC market has been residential since its inception, and continuing throughout 2017 with a third of the overall market. The product types of autoclaved aerated concrete are distributed into tiles, panels, blocks, lintels and others.

The growing market is propelled by elements such as the increased importance of utilizing green building materials, the use of recycled materials themselves (fly ash, etc), and its superiority to commonly used materials for the same purpose.

Currently, limited adoption is due to high start up costs associated with AAC, and because manufacturing facilities are not yet commonplace, resourcing and logistics becomes problematic.

As adaptation grows however, and infrastructure is set in place, the forecast for AAC paneling is projected to grow almost 8% in the next 5 years.

Globally, Europe has lead in market consumption. However, the Asia Pacific region, including countries like China, Thailand, Malaysia, Singapore and Indonesia are expected to increase consumption by over 10%, also within the next 5 years.

Opportunities in the AAC market are real as there is strong interest in China, India and other densely populated regions who would benefit from disaster resistant structures made from coal combustion products (CCPs).

To read more about autoclaved aerated concrete construction, trends, and forecasts for investment and integration, please read Orbis Research’s report:  Global Autoclaved Aerated Concrete (AAC) Market-Segmented by Type, Application (Construction), and Geography-Trends and Forecasts (2017-2022). Follow the link in the text for more information.

To learn more about global trends and research on AAC and CCPs, join us at Coal Ash Asia 2018.

China Coal Combustion Product Conference: Technological Innovation to Promote Green Development

- Shuozhou City, Shanxi Province, China

The Asian Coal Ash Association would like to thank all who participated in CICCPC 2017, the most recent international exchange in Shuozhou. This year’s topics focused on fly ash and desulfurized gypsum, with the theme "Technological Innovation to Promote Green Development". During the two day event participants engaged in technical exchanges on comprehensive utilization of fly ash and gypsum and discuss the latest scientific research.

One goal of the conference was to further strengthen international and domestic cooperation to promote technological progress and industrial development. Experts from the U.S.A, Germany, Australia, Canada, Ukraine and Japan were among the 700 participants at this year’s event.

The conference was jointly organized by AsianCAA, the National Institute of Building Materials Industry Information, Shuozhou Municipal People's Government, and the Shanxi Economic and Information Commission.  Mr. David Harris, the chairman of the Asian Coal Ash Association gave keynote and regular session speeches during the proceedings. Mr. Harris outlined coal ash and other solid waste utilization technologies, international trade status’ and industry development prospects.

In conjunction with the regular plenary session, was a product/technology exhibition and academic poster display. A variety of specialized meetings also took place at CICCPC. The meeting of the National Coal-based Solid Waste Resource Industry Technology Innovation Strategic Alliance took place for the first time during proceedings. There was a Fly Ash Intelligent Sales Control System meeting as well as a special Green Building Materials and Construction Technology exchange. The Ceramic Association business forum convened during the 23rd of September and  Shuozhou City Investment Promotion and Tourism Promotion gave a special inside look into regional operations. Guests were also able to enjoy an afternoon of horse racing at Youyo County and many other networking opportunities.

Who Will Be At World of Coal Ash 2017?

- Lexington Kentucky

AsianCAA will attend its 3rd World of Coal Ash conference, this May 8-11 in Lexington Kentucky. Mr. David Harris, Chairman of the association will be presenting during the Shortcourse portion of the event, sharing an international perspective on Asian suppliers meeting global demands. Mr. Harris serves as advisor to power generators, construction material manufacturers and municipalities in Asia. Keep reading for presentation times and locations.

Hongli Recycling

A subsidiary of Datong Coal Mine Group will be bringing a small delegation of representatives to share their unique jet steam milling technology. The jet steam facility is the largest in China with an annual output of 100,000 tons of ultrafine industrial minerals.

Institute of Technical Information for the Building Materials Industry (ITIBMI)

Our co-hosts of Coal Ash Asia and academic matching partner for this year’s Coal Ash Asia event, July 21-24 will be attending WOCA this May. The Institute of Technical Information for Building Materials Industry of China was founded in 1958 and is managed by the China Building Material Industry Association (CBMA). ITIBMI is dedicated to research on cement, glass, ceramics, new building materials and non-ferrous metal, and has publications particularly on cement itself and the building material industry. The institute is one of the key organizations working on cement technologies and materials in China, with direct relevance to energy efficiency.

Come visit AsianCAA and our members at World of Coal Ash:

Asian Coal Ash Association Booth: #94, Exhibition Room. Lexington Convention Center

Bill Martin Presentation: "Superheated Steam Jet Milling" Wednesday May 10th, 4:30pm Regency Ballroom 2, Session 6, Presentation #261

David Harris Shortcourse Presentation: "Can Asian Suppliers Meet Global Demand?" Monday, May 8, 3:30pm - 4:00pm Lexington Convention Center

Want to know who else will be exhibiting at World of Coal Ash?

Click here to see the list of 2017 exhibitors.

Odd-Even Road Rationing: Phase Two in New Delhi

New Delhi-

The first phase of New Delhi’s odd-even road-rationing scheme was completed in January of this year, the second phase of which will be initiated in mid April. The project aims to properly measure the amount of pollution caused by traffic on any given day. Weather plays a crucial part in measuring carbon emissions with certain times of year being more problematic than others. Winter weather poses issues with irregularity in weather conditions. In cold weather, the polluting particles remain close to the surface of the road and contribute to smog. In the hotter months, unstable hydrocarbons and other compounds create a photochemical reaction with NOx emissions and create ozone. Officials are hoping that the second phase will give more accurate readings and help to support local taxation for polluting automobiles and restructuring of public transportation to include 1000 more busses on the road. The safety limit for emissions of this nature is 100 micrograms per cubic meter. Last year from the middle to the end of April saw ranges from 120-250 micrograms per cubic meter.  

Restricting vehicles on the road is one component in the cavalcade of changes and reforms being encouraged by industry specialists. A further step in reducing automobile pollution would be to impose discouraging taxation on private vehicles and encourage use of public transport. Fining visibly polluting vehicles and implementing parking curbs have also been tabled at recent government meetings

The Central Pollution Control Board’s focuses their monitoring on roadside emissions when calculating annual pedestrian pollution. Anumita Roy Chowdhury, head of the clean air program at the Centre for Science and Environment says that the odd-even approach of having half of private vehicles off the roads at any given time can be assessed effectively through the CPCB model. She went on to emphasize the importance of a newly defined pedestrian and cycle based infrastructure and taxation that discourages vehicles and drives pollution out of key areas like Okhla industrial area in East Delhi.

IIT Kanpur releases an annual report on national air quality relied on by the government to assess practices regarding pollution control. Private vehicles make up the majority of emissions in populated areas. However, the report also identified other components that make up for 40% of the matter that pollutes in hot weather. These particles are made up of road dust and soil as well as airborne fly ash. The report addresses the issue of poor maintenance when concerned with proper storage and transport of fly ash. Whether in use or not, the summer months dries the fly ash, making it more likely to become airborne.