Calcium carbonate upgraded from traditional industry to sunrise industry

　　Calcium carbonate is everywhere in nature. Because it is not something that is “rarely expensive”, it has always been regarded as an ugly duckling, which is the lowest in white powder materials. However, in the development trend of adjusting structure and transfer mode, some domestic calcium carbonate enterprises have successively developed high value-added calcium carbonate products. The old ugly duckling really turned into a white swan.

　　Say goodbye to "White Mansion" and "Slag Cave"

　　Calcium carbonate is an old traditional industry in China. Due to the long-term market demand for low-value white powder materials, the domestic calcium carbonate industry has been slow to upgrade, and has long been producing low-end products. In the past few years, the average price of China's export calcium carbonate is generally only about 140 US dollars per ton, while the average price of imported calcium carbonate is generally about 450 US dollars per ton, and the price of imported products is 3 times that of domestic products. It can be seen that the grade and price of domestic calcium carbonate products are quite different from those of similar foreign products.

　　Kang Heyi, secretary-general of the Calcium and Magnesium Branch of the China Inorganic Salt Industry Association, told reporters that in the past, when it came to the calcium carbonate industry, people naturally think of serious pollution and low-grade products. In the production process, Bailong (white water, white powder), black dragon (black smoke, black residue) raged, the industry called the calcium carbonate plant "white mansion", "slag hole". However, in the past two years, with the country's vigorous promotion of industrial restructuring and energy conservation and emission reduction, China's calcium carbonate industry has undergone large-scale transformation and upgrading. At present, the company's lime calcination has gradually achieved automation; lime digestion has evolved from a single retrofit ash to the current trough ash, wheeled ash, etc.; the drying process is developed from the drying of the heat transfer oil tube to the drying of the rotary tube, Rotary steam drying, tray drying, etc.; carbonization process from a single high tower bubble carbonization, low tower bubble carbonization to the current large diameter high tower carbonization. Most companies have greatly improved the level of production technology and equipment.

　　The upgrade of production technology has brought about product upgrades. At present, a number of domestic calcium carbonate enterprises stand out in the development of functional, serialized and specialized products. The automobile chassis paint calcium carbonate produced by Jiangsu Changzhou Calcium Carbonate Co., Ltd. accounts for 80% of the domestic market; the ink calcium produced by Beijing Chemical Building Materials Factory accounts for 80% of the domestic market; the adhesive nanometer produced by Guangdong Jiawei Chemical Industry Co., Ltd. Calcium, pharmaceutical calcium carbonate produced by Zhejiang Jiande Zhengfa Industrial Co., Ltd., toothpaste grade calcium carbonate produced by Zhejiang Jiande Tianshi Calcium Carbonate Co., Ltd., coating grade papermaking calcium produced by Dujiangyan Calcium Company, etc., all in the domestic market Have a certain share. Various modified active calcium, special calcium, various crystal forms of calcium carbonate, calcium carbonate with narrow particle size distribution are emerging in an endless stream. These new varieties fill the domestic gap and meet the special needs of different industries. Calcium carbonate, a "high-energy, low value-added" traditional product that burns limestone, has become the darling of the high-end market.

　　The more developed the economy, the more needed it is.

　　Jiang Shiguang, deputy secretary-general of China Inorganic Salt Industry Association, has been concerned about the future of traditional industries such as calcium carbonate. He believes that calcium carbonate is still a sunrise industry, and low-carbon, energy-saving nanotechnology is a new engine for the development of the calcium carbonate industry.

　　He believes that to look at the development trend and vitality of a product, we must first study the market development of the product in the United States, Europe and Japan. After all, the United States, Europe and Japan are the main forces of today's world economy. Analysis of calcium carbonate industry in western developed countries, we can see calcium carbonate as a basic chemical raw material commodity, its supply and demand relationship and the macroeconomic development of western countries are stable and linear development, certain economic aggregates need a certain quantity and quality of inorganic salt products, support. Especially now, because calcium carbonate is the only industry in which carbon dioxide is effectively utilized in the limestone processing industry, under the advocacy of a low-carbon economy, the world's economic powers have increased the development and application of calcium carbonate products. This can be proved by the development trend of the expansion of the satellite light calcium carbonate production model to the global expansion by large American companies and the rise of stone paper with calcium carbonate as the main raw material in China.

　　It is understood that at present, a new development trend in the global calcium carbonate industry is that various special-purpose calcium carbonate production and its downstream large users - paper, paint and other production plants constitute a satellite industrial structure.

　　Close to these large users supporting production, calcium carbonate can be piped in the form of slurry, eliminating the drying process of calcium carbonate slurry, which can save a lot of energy and greatly reduce production costs. The domestic calcium carbonate industry has noticed this development trend in the world. Some large-scale light calcium carbonate enterprises have begun to actively contact with downstream large users to explore the feasibility of establishing nearby plants and supplying slurry materials.

　　In the past two years, the calcium carbonate industry has been paying attention to energy conservation and emission reduction, vigorously promoting the promotion of energy-saving equipment and energy-saving technologies, and reducing the comprehensive energy consumption per ton of products by 5%. In terms of pollution control, the focus is on dust pollution, especially calcium oxide dust, workshop dust and secondary dust, and innovations and breakthroughs in equipment and technology.

　　Recently, the Inorganic Salt Association has concluded two new energy-saving devices. The first is energy-saving and environmentally friendly automated calcining kiln. This is developed by a domestic company based on the introduction of Japanese lime shaft kiln technology. The calcining kiln adopts the technology of import and export waste heat exchange, 9-point uniform cloth and non-stop wind ash, multi-point weighing control, power frequency conversion operation, etc., and achieves kiln coal consumption of 120 kg per ton of ash and raw over-fire control at 5 %~7%, the emission of soot is controlled at an advanced level of 50 mg per cubic meter.

　　Second, the Inorganic Salt Association invites domestic centrifuge manufacturers to develop a suitable large-scale energy-saving centrifuge for light calcium production according to the lack of large-scale energy-saving centrifuges in the industry. The Inorganic Salt Association is confident that the promotion of this equipment can change the backwardness of the piles of small centrifuges in domestic calcium carbonate enterprises.