Thread Content
Yingcheng Xindu Chemical Co., Ltd. plans to invest 540,000 million yuan in the Yingcheng Salt Chemical Industrial Park to carry out a project aimed at promoting green transformation of the salt chemical circular economy industry chain as well as adjusting and upgrading product offerings. The project scope includes: the project covers an area of 1,280 mu, and it involves the construction of facilities for producing 600,000 tons per year of water-soluble compound fertilizers, 400,000 tons per year of slow- and controlled-release compound fertilizers, 700,000 tons per year of refined salt, 200,000 tons per year of sodium bicarbonate (baking soda), and 50,000 tons per year of melamine ； Renovation and expansion of 300,000 tons of sodium hydride and 700,000 tons of synthetic ammonia production facilities ； 300,000 tons of light alkali converted to heavy alkali ； Equipped with intelligent warehousing and dedicated logistics lines. Currently, the project is undergoing the second public announcement for its environmental impact assessment. The project uses coal as raw material; syngas is produced through multi-nozzle water-coal slurry gasification at East China University of Science and Technology, and synthetic ammonia is then manufactured after purification. Some of the liquid ammonia is sent to existing facilities, while the rest is sent to the devices used for producing caustic soda, sodium bicarbonate, melamine, sodium nitrite, and sodium nitrate. The process technologies to be employed in this project are as follows: For ammonia synthesis, crude gas is produced by using the multi-nozzle opposed water-coal slurry gasification method developed by East China University of Science and Technology. The crude gas undergoes isothermal shift reaction and heat recovery, followed by low-temperature methanol washing to remove acidic gases; after further purification with liquid nitrogen, it is sent for ammonia synthesis. The acidic gas generated by low-temperature methanol washing is sent to a sulfur recovery unit, where sulfur is produced using a two-stage Claus process. Urea is produced via carbon dioxide stripping to yield 95% urea, which is then sent to the compound fertilizer and triamine production processes. Melamine is produced via a one-step low-pressure gas-phase quenching process, using urea slurry as the raw material, molten salt as the heat carrier, and reaction gas as the carrier gas, under the action of a silica-alumina gel catalyst. The compound fertilizer production line includes water-soluble compound fertilizers and slow/controlled-release compound fertilizers. It is produced according to the different formulas of the two types of compound fertilizers. The production processes for the two fertilizers are basically the same. Current status of the facilities at Yingcheng Xindu Chemical: Yingcheng Xindu Chemical is a wholly-owned subsidiary of Chengdu Yuntu Holding Co., Ltd. Xindu Chemical in Yingcheng City currently has the capacity to produce various types of nitro compound fertilizers at a rate of 600,000 tons per year; it also has the capability to produce synthetic ammonia at 250,000 tons per year, soda ash at 600,000 tons per year, and sodium nitrate and sodium nitrite at 100,000 tons per year. According to the environmental impact assessment documents published on the Hubei Xiaohuan Network, the process technologies used in each unit are as follows: For ammonia synthesis, coal is used as a raw material and reacted with steam in an oxygen-enriched continuous gas generation furnace to produce semi-water gas; this semi-water gas is then refined through dust removal, desulfurization, shift reaction, decarburization, and alkylation before being used in a synthesis tower to produce ammonia. Soda ash is produced using a process that involves single carbonization, two-stage ammonia absorption, single-stage solid salt addition, cooling with a cold crystallization tank, and drying of wet ammonium, thereby producing ammonium chloride as a by-product. Dilute nitric acid is produced using a two-pressure process, namely oxidation at 0.45 MPa and absorption at 1.1 MPa. The nitro compound fertilizer *AO acid AN slurry production section employs a neutralization process based on high-pressure liquid-gas mixing reaction of ammonia and nitric acid. Compound fertilizers are produced using a high-tower granulation process via melting. Direct absorption process using concentrated nitrate gas (sodium nitrate, sodium nitrite) method. Technologies such as continuous conversion, two-effect evaporation, OSLO vacuum crystallization, and DCS control system are employed; the process includes sections for caustic dissolution, ammonia conversion (oxidation), alkali absorption, and post-treatment. *Calcium ao acid is obtained through crystallization.*Calcium ao acid is produced in this way. Calcium nitrate solution is produced by reacting nitric acid with limestone. *Ao acid an solution is then added in a certain proportion. After two-stage evaporation and concentration, a crystalline solution of *ao acid an calcium is obtained, which is subsequently granulated. It mainly includes processes such as stone dissolution, filtration, mixing, double-effect evaporation, and granulation.