On October 20, news came from Chengdu Qianlijin Science and Technology Innovation Co., Ltd. that the company's original innovative invention technology, gypsum acid co-production cement patent technology device, successfully started and produced qualified sulfuric acid and cement clinker products.
The picture shows the exterior of the gypsum acid plant.
According to Gong Jiazhu, deputy director of the Inorganic Acid, Alkali and Salt Professional Committee of the Chinese Chemical Industry Society, deputy director of the Editorial Committee of the Chinese Core Journal "Inorganic Salt Industry", chairman of the Phosphate Expert Group and senior engineer, the patented technology of the project is the first set of production of Chengyuan Environmental Protection New Materials Company in Yichang, Hubei Province. The second set is located in Guizhou Kaiyang Chemical Industry Park, Shengwei Group Guizhou Kaiyang Chemical Company Sulfuric Acid Branch, 500000 tons of phosphogypsum to produce 200000 tons of sulfuric acid and 200000 tons of cement clinker. After the installation of the complete set of equipment was completed, the ignition rotary kiln and sulfuric acid conversion were heated up at the same time on October 6, and the trial production was put into operation on October 8. After 72 hours, 144 hours and 288 hours of chemical linkage test, the equipment was put into production directly, and has been in stable production for 15 consecutive days, gradually increasing production from low load to high load. The results of the chemical commissioning process, such as process, equipment, electrical, environmental protection, safety and training of operators, were comprehensively tested.
Gong Jiazhu said that the earliest technology of gypsum acid co-production cement was proposed by German engineer M Müller in 1915. He used a hollow rotary kiln to add coke and auxiliary materials for gypsum reduction and decomposition at high temperature, and the decomposition gas was used to produce sulfuric acid and the solid after high temperature decomposition as cement clinker. K Kühn, a German engineer, carried out industrialization and put into production in 1931, which became the earliest Muller-Kuhn process (M-K method); With the development of the times, because of the high energy consumption of its technology, in 1972, two engineers of Linz Chemical Company in Austria, Osw and Pupp, added a vertical preheater to recover the sensible heat of flue gas and used phosphogypsum as raw material; This is the phosphogypsum acid production Os-Pupu process (O-S method, originally called O-K method, because it is spelled from the Russian translation). These production processes only rely on a hollow kiln and a torch radiant heat to carry out the production reaction of mineral decomposition chemistry, which can not control the contradiction and unity brought by the reaction mechanism of high temperature semi-reduction decomposition of phosphogypsum and oxidation firing of cement clinker, mineralization and micro-melting (liquid phase coefficient), resulting in poor production stability, common ring and ball formation in the kiln, and frequent start-up and shutdown caused by cleaning. Its core is low decomposition rate of gypsum composition, high energy consumption, frequent sublimation of sulfur, poor quality of cement and high content of calcium sulfide. Gong Jiazhu's invention patent was authorized
in 2013. The technology uses wet-based feed to efficiently recover the sensible heat of flue gas, eliminating the unit operation of drying production energy consumption of the original process, saving 120 kg of gypsum drying coal per ton of sulfuric acid, and eliminating the suspension preheater, eliminating the segregation of reduced coke after mixing and the early combustion in the preheater. A two-stage rotary kiln technology is adopted to separate the chemical actions of the respective reaction sections of the decomposed materials, and scientific distribution and control are carried out according to the chemical weak oxygen and strong oxygen atmosphere, the reaction time (kiln rotating speed), the temperature field, the radiation and convection heat transfer efficiency and the like. After the production index is stable, the decomposition rate of phosphogypsum is more than 98.5%, the energy efficiency is high, and the coal consumption is 60% of the original technology.
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