The Inevitable Trend of Using High-strength Ceramics to Replace Shale and Clay

Beijing, as the capital of China, is the nation's political center, cultural center, international communication center, and science and technology innovation center. It is also China's economic decision-making center. Beijing represents the country’s image and the future direction of the country’s development. As early as several years ago, Beijing government departments had noticed the destruction and impact of the production of clay and shale ceramsite on the natural environment, the living environment of human beings, and the existing farmland. They issued successive related decrees and documents and banned the use of clay. Shale ceramsite is a raw material for building materials.

According to the "Circular on Issuing the Fifth Batch of Banned and Restricted Use of Building Materials and Construction Technology in Beijing" (Beijing Building Materials [2007] No. 837), the document implemented from January 1, 2008 stipulates that: Serious destruction of cultivated land and vegetation, clay and shale ceramsite and building material products made of clay and shale ceramsite were banned. In 2014, the Beijing Municipal Commission of Housing and Urban-Rural Development of Beijing Municipal Planning Commission issued a notice on the publication of the “Catalogue of Promotion, Restriction, and Prohibition of the Use of Building Materials in Beijing (2014 Version)” of the Beijing City Planning Committee: due to resources in the production process. Due to high consumption and serious environmental pollution, the use of sintered clay bricks and sintered shale bricks is prohibited.

There are serious problems in the production of shale and clay ceramsite:

The environmental protection investment is not in place, shale and clay ceramsite treatment process is simple, and the flue gas treatment unit is single behind. Since the production of shale and clay ceramsite requires a large amount of raw materials, it is necessary to continuously satisfy the supply of raw materials based on sacrifice of cultivated land and vegetation environment. This practice has seriously damaged the ecological environment and destroyed farmland and vegetation. However, the produced ceramsite cannot be fully utilized; in the entire production process, due to the fact that the existing production technology is too backward, the solid waste and harmful gas generated cannot be disposed of properly, causing environmental pollution.

The backward production equipment, lack of complete sets of equipment, and low degree of automation. In general, the level of industrial equipment is not high, most of the ceramics production enterprises are rough in production equipment, performance quality and there is a big gap compared with foreign advanced countries. Many production lines have low degree of automation, and even less mechanization. Many equipment on the production line borrows related equipment from the brick and cement industry. Simple borrowing causes the performance parameters of the equipment to be inconsistent and unmatched with the ceramsite production process, which increases the energy consumption of the ceramsite production and increases the cost. The effect of the use of equipment can not meet the requirements of ceramic processing technology. The shale and clay ceramsite produced cannot meet the technical standards and cannot be reasonably applied.

Shale and clay ceramsite industries will be eliminated in future development:

In 2015, President Xi Jinping expressed at the APEC Economic Leaders Summit that China will pay more attention to green development, integrate ecological civilization construction into all aspects and the entire process of economic and social development, and commit itself to sustainable development. Improve the ability to adapt to climate change, adhere to the basic national policy of resource conservation and environmental protection, and build a beautiful China with blue sky, green land, and clear water. As countries and governments implement and promote environmental protection policies, enterprises and industries that have caused serious damage to the environment will gradually be eliminated. Enterprises and industries represented by the production of shale and clay ceramsite will certainly be eliminated in the future.

New trends in the development of the ceramics industry in the future:

First, R&D and production of high-strength ceramic pellets. To meet the needs of green buildings, fabricated buildings and sponge cities, R&D and production of high-strength ceramic pellets are actively creating rigid demand. High-strength ceramic pellets are artificial lightweight aggregates with a density grade of 600 kg/m3 to 900 kg/m3 and a cylinder pressure of 4.0 MPa to 6.5 MPa within the firing temperature range. Zhengzhou Minerals Machinery Co., Ltd. through the adjustment of raw material ratio, process firing system and other measures produced by the ceramic particles by the Guangdong Building Materials Research Institute test data show that: the bulk density of 700kg/m3 ~ 900kg/m3; cylinder pressure strength can reach 10MPa ~ 15MPa Water absorption rate (1h water absorption): 5%~10%; Corresponding to concrete dry density of 1750kg/m3~1900kg/m3; Compression strength of 3 days to reach 50MPa~60MPa, 28 days to reach 70MPa~80MPa.

Second, fine-grained ceramsite, optimized ceramsite particle size distribution. The demand of the market for the grain size of the ceramsite becomes more and more diversified. The requirements for the grain size below 10mm are more and more, and the requirements for the grain shape coefficient are getting higher and higher. Henan Zhengyuan Machinery Co., Ltd. is a company specializing in the production of fine-grained ceramsite. At present, the company mainly produces ceramic granules with a diameter of less than 10mm. The produced ceramsite has good uniformity and excellent coefficient of grain shape.

Third, strengthen the construction of enterprise laboratories and train experimental technicians. The product structure optimization adjustment can not be separated from the lab's experimental research, especially the production of silt, sludge, residue soil, contaminated soil, and various solid wastes as raw materials. The ceramic granule pilot test line independently developed by Henan Zhengyuan Machinery Co., Ltd. fully satisfies the requirements of early ceramsite proportioning and firing system tests. It is the first test line in the central region and fills vacancies in the central region, and welcomes enterprises. Come to visit.

In the future, building materials with shale and clay ceramsite as raw materials will be phased out, and low-density, high-strength ceramics will be the chase point for market demand. High-strength ceramsite will become the development of the ceramic industry in the future. Mainstream direction.