The sulfuric acid industry in China started in 1870's. The construction of sulfuric acid production plants with relatively large capacities started in 1930's. In 1960's, the sulfuric acid industry began to step into the track of steady development. After entering 1980's, with the development of compound phosphate fertilizer industry, a number of associated large-scale sulfuric acid production plants using pyrite and sulfur as raw materials have been built up. Meanwhile, in-step development of acid production using smelting flue gases from non-ferrous metal enterprises has been achieved. Currently, the maximum single-line production capacities of domestic sulfuric acid plants are: 600kt/a for sulfur-burning sulfuric acid plants; 600kt/a for the ones using smelting flue gases; 400kt/a for the those using pyrite; and 200kt/a for those using phosphogypsum. The overall levels of the technology of these large-scale sulfuric acid plants have either reached or approached the world's advanced levels. At present, there are more than 500 sulfuric acid production enterprises in China. In 2002, the output of sulfuric acid in China reached 30.52 million tons, which made China rank second in the world.

ECEC has been engaged in the engineering and construction of sulfuric acid plants since 1970's and has successively undertaken the engineering design and construction for many large-scale sulfuric acid plants, such as the 200kt/a sulfuric acid plant project of Tongling Huaxing Chemical Co., Ltd., which uses pyrite as raw material; the 200kt/a sulfuric acid making project of Shandong Lubei Chemical Works, which uses phosphogypsum as raw material; the 800kt/a sulfuric acid making project of Guizhou Hongfu Industrial & Commercial Development Co., Ltd., which uses pyrite as raw material; the 1,500MTPD acid making project in Chile, which uses smelting flue gases as raw material; the 600kt/a sulfur-burning sulfuric acid project of Yunnan Three Circles Chemicals Co., Ltd., etc. Through decades of unceasing development of engineering technology and accumulation of engineering experience, ECEC has become one of the most active and strongest engineering companies in China in the construction of sulfuric acid plants.

In order to provide clients with sulfuric acid plants which are advanced technologically and reliable in operation, in addition to developing process technology and key equipment independently, ECEC also keeps good relations with world-famous licensors or engineering companies, such as Kavner Chemetics of Canada, Monsanto of U.S.A., Lurgi of Germany, Mitsubishi Heavy Industries of Japan, etc.

Sample projects:

Guizhou Wengfu 800kt/a Sulfuric Acid Project
Customer: Guizhou Hong Fu Industrial & Commercial Development Co., Ltd.
Plant capacity: 800kt/a sulfuric acid plant using pyrite
Source of technology: The technology was from Lurgi GmbH, and the basic engineering design was provided by Mitsubishi Heavy Industries, Ltd..
Process route: A process flow of fluidized-bed roasting, acid washing and purification, double-conversion and double-absorption was used for sulfuric acid plant. High-quality sulfuric acid product is produced following the process steps of roasting of pyrite, purification, conversion, drying and absorption, etc.
Year of completion: 1999

600kt/a Sulfur Burning Sulfuric Acid Project
Customer: Yunnan Three Circles Chemicals Co., Ltd.
Plant capacity: 600kt/a sulfur burning sulfuric acid plant
Source of technology: Independently-developed process technology
Process route: A process flow of quick sulfur melting with agitator, filtration of coarse sulfur through filters, pressurization and mechanical atomization of liquid sulfur, sulfur burning in air, “3+1” double-conversion and double-absorption is used. High-quality sulfuric acid product is produced following the process steps of smelting and incineration of sulfur, conversion, drying and absorption, etc.
Year of completion: 2003