Refractory enterprises should transform to low carbon environmental protection

[ Publish: 2018-11-27 ]

Core tip: with the continuous progress of China's cement technology and large-scale kiln, the refractory technology of cement firing system is also developing rapidly. The stability rate of refractories has a direct impact on process parameters and the operation stability of kiln system. Therefore, how to balance the contradiction between energy saving and environmental protection and extend the service life of refractories has always been a topic of continuous concern to the cement industry.

With the continuous progress of cement technology and the large size of kiln, the refractory technology of cement firing system is developing rapidly. The stability rate of refractories has a direct impact on process parameters and the operation stability of kiln system. Therefore, how to balance the contradiction between energy saving and environmental protection and extend the service life of refractories has always been a topic of continuous concern to the cement industry.
"Refractories must reach the service life, and at the same time conform to the state regulations on environmental protection and energy conservation." Feng jisheng, general manager of shandong shengchuan ceramic material co., ltd. told China cement network reporter, "in recent years, the country is paying more and more attention to environmental protection, and chromium pollution problems exist in cement and other industries for a long time, refractory enterprises should take social responsibility, through technical means to promote low chromium products or even chrome-free.
Chromium and its compounds do great harm to environmental pollution, especially the heavy metal pollution of hexavalent chromium. Hexavalent chromium is a persistent hazard to the environment and is easily absorbed by the human body. It can invade the human body through digestion, respiratory tract, skin and mucosa. More likely to cause genetic defects; Inhalation may even cause cancer. Hexavalent chromium in cement industry mainly comes from three aspects: raw materials, nickel-chromium alloy and magnesium-chromium brick, among which the content of chromium in raw materials is low, and the harm mainly comes from nickel-chromium alloy and magnesium-chromium brick. The addition of chromium into the refractory can effectively improve the wear resistance, high temperature resistance, corrosion resistance and other characteristics of the product, so it is widely used in the cement process of suspension preheater and burning belt. The national environmental protection department has always attached great importance to the chromium pollution in cement industry, and has a set of strict treatment methods for waste bricks containing chromium. However, because it is difficult to put them into practice, and the price of foreign products is high and the variety is single, so nickel-chromium alloy and magnesium-chromium brick are still widely used in cement industry.
To eliminate the problem of chromium pollution in cement industry, it is necessary to find an ideal chrome-free product to replace the existing chrome-containing resistant materials. JiSheng said: "our company research and development of the ceramic tube preheater, and the parent company in zibo city shandong refractory material co., LTD. The new magnesium iron and aluminum spinel brick, its purpose lies in promoting low carbon refractory material of environmental protection, to provide users with products that meet the technical standards, meet the demand of users at the same time, the product without chromium." The inner cylinder of the all-ceramic preheater developed by shengchuan ceramics, as a non-metallic refractory without chromium, is not only superior to the heat-resistant steel of nickel-chromium alloy series in terms of resistance to high temperature, corrosion and wear resistance, but also has a service life of 2-3 times that of ordinary heat-resistant steel. The magnesia, ferroalumina spinel brick introduced by luzhong refractory material has good performance in hanging kiln skin, and has the characteristics of anti-peeling, anti-thermal shock, long service life, etc., which can well replace magnesia, chromium brick as the ideal refractory material in the high temperature zone of cement rotary kiln.
Feng jisheng also pointed out that a qualified refractory to meet the needs of users, it is very important to meet the service life requirements. Because as the kiln system of form a complete set of materials, the service life of refractory products must be in multiples of 1 year, or 2 years or 3 years or longer service life, convenient stop at every year kiln cement enterprises overhaul that replace the refractory material, by the way, if the service life of refractory is 1 and a half years, directly replace cement enterprises must be 1 years later, and will not wait for a year and a half later dedicated to replace refractory material and kiln production, so the service life of refractory material must match with the cement kiln system.
To ensure the quality of resistant materials, the quality of raw materials must be guaranteed first. In recent years, the development of refractory industry is very fast, but the development of technology can not catch up with the speed of the lack of raw materials. "Now refractories are facing a more embarrassing situation, on the one hand, less and less high-grade natural minerals, product quality is difficult to be fully guaranteed; On the other hand, the purchase price of raw materials is getting higher and higher, and the fierce price competition in the refractories industry makes the product price constantly lower and the profit space of enterprises constantly squeezed. Feng jisheng pointed out that over the years of disordered mining and inefficient utilization, so that high-quality mineral resources become increasingly scarce; And inferior quality of trona and didn't get reasonable use, abandoned in the mostly by or as a waste treatment, although the refractory technology has improved, but the one, the grade of raw materials not guaranteed, the quality of the refractory will also be worrying, so want to ensure that the grade of raw materials, and refractory the transformation to low carbon environmental protection, improve the utilization rate of resources. Take luzhong refractory as an example, the company has built two bauxite clinker bases with an annual output of 60,000 tons in shanxi and one coke and gem base with an annual output of 80,000 tons in zibo, which has reduced the procurement cost. In the efficient use of resources, the mineral grade division, the high grade of raw materials for deep processing, and the low grade of ore will be rebatching, the use of technical means to remove the impurities inside, the low grade of ore through the synthetic process of grade up. By establishing a mineral base and adopting advanced technology for orderly mining, luzhong refractory materials can not only achieve low carbon and environmental protection, but also enable the rational and efficient utilization of different grades of minerals, ensuring the supply of raw materials and the stability of product quality. Sponsored by the China cement net, jiangsu constant resistance furnace charge group co., LTD, assisted Chinese cement refractory peak BBS on March 12-14 in urumqi, xinjiang, China cement net will invite the cement industry, cement and related equipment enterprise expert leadership to attend the meeting, discuss without chromium how to maximize the life of refractory material, refractory material enterprise how to transition to a low-carbon environmental protection and refractory material technology, etc.

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