Non-metallic mining projects across the development of innovative

　　Anhydrite (ie, anhydrite) A sulfate minerals. Our gypsum reserves in the world, has proven reserves of 100 billion tons, of which 70% for anhydrite. Anhydrite gelling poor performance, setting and hardening long time, so utilization is not high, a small amount is used as cement retarder and activated after treatment production anhydrite cementing material. Rich resources and the application of low value-added products in stark contrast.

Three years ago, the National Development and Reform Commission, the New Building Materials Co., Ltd. Hunan Xiangfu use its "anhydrite and vitriol cement" patented technology, in collaboration with the German energy group RWE, "an annual output of 150,000 tons of cement residue anhydrite" Clean development Mechanism projects. Recently, the company "sulfuric acid anhydrite cement carbon cycle cogeneration technological transformation" project will be officially put into operation.

By then, China Non-metallic Minerals Industry Association will convene technological innovation project site meetings, highlights anhydrite sulfuric acid and cement new technology, new products, and promote the development and utilization of non-metallic mineral depth. Innovative practices Xiangfu company as "gypsum big" in our country, accelerate national non-metallic mineral resource advantages into economic advantages into provides a good template.

Sulfuric acid, known as "the mother of industry." According to statistics, China's annual output of about 55 million tons of sulfuric acid, the annual demand at 60 million tons. However, China is not rich in sulfuric acid production materials: decreasing the amount of pyrite mining and lower grades, metallurgical acid gas accounted for only about 10% sulfuric acid production. To meet the demand, China's import large quantities of sulfuric acid, which is part of the production has reached 50% of total production, resulting in sulfuric acid prices fluctuate with sulfur import prices.

Sulfuric acid for the preparation of raw materials to crack problems, our sixties of last century it was organized industrial test gypsum produced sulfuric acid, since the eighties with phosphogypsum vitriol cement technique gained some success. But as industrial waste phosphogypsum containing phosphorus pentoxide, fluoride and other harmful impurities, not only difficult to produce, and energy consumption, high production costs.

In this regard, Hunan Xiangfu R & D team thought "anhydrite." Anhydrite is not only rich in resources in our country, in the county where the company linli reserves also quite rich: proven reserves of 2.17 billion tons of gypsum, anhydrite which about 1.6 billion tons.

Chairman ARMED ever forget T account: the influence of calcium sulfate anhydrite decomposition of harmful impurities very few ingredients can be effectively controlled in the mining, production quality and may require the preparation of low heat Portland cement raw materials, production of sulfuric acid high. Using its self-developed patented technology anhydrite sulfuric acid system, the main resource cost is only 10% -15% sulfuric acid for 15% -20% pyrite, the production cost is acid anhydrite about 40% sulfuric acid, and is about 50% sulfuric acid. Therefore, anhydrite become sulfuric acid to produce the most economical process.

ARMED introduction, this preparation of sulfuric acid purification and pioneered the use of double-absorption process, by increasing the middle of the absorption process, the total sulfur dioxide can be increased to over 99% conversion rate. Process exhaust emissions of sulfur dioxide concentration in fully compliance. In addition to acid addition, this technology can also be low heat generation high belite cement clinker. Compared with the high belite cement with lime production process more simple aspects, and technology used in the formula to maximize the amount of gypsum, does not contain harmful ingredients, but also did not play the role of mineralization. To solve the shortage of resources not only provides a reliable method of producing sulfuric acid, can also produce construction projects require a low heat of hydration of cement, making the concrete durability is improved.

Has been involved in the guidance of Chinese Academy of Engineering Jishan think Xiangfu company adhere to independent innovation, pioneered the use of sulfuric acid anhydrite and cement this new sulfuric acid pathway, good economic returns, environmental benefits are very significant. Gypsum acid traditional craft is a major breakthrough, but also to promote the rapid development of a major innovation in the engineering industry.

By up to eight years of continuous research and development, Xiangfu company perfected the key technological industrialization of sulfuric acid and cement plaster, the complete system operation security technologies and extend its core technology to other industrial chemical gypsum plaster of industrial production , to create the development of a non-metallic plaster Unlike traditional way of mining enterprises to explore the development of a new model of low-carbon energy cycle.

Currently, the company is working with research institutions (the) cooperation with sulfuric acid as raw materials, research and development of high value-added fine chemical projects. Promote the sulfuric acid product as a leader, to develop the next extension products, expand the industrial chain, to build a one billion industry cluster.