Research And Development On Fluoride Retention Of High Efficiency And Low-cost

Fluorine is an element of great environmental interest and fluoride is one of the pollution controlling species. Combustion of coal is a potential source of fluoride in the atmosphere and environment. There are two methods of exploiting fluoride retention of high efficiency and low-cost, which is to make CaO more activated and to improve stability of CaFa.In this paper, a series of key problems are reported, including four aspects: the microcosmic pore structure characteristic of fluoride retention by mercury porosimetry and SEM visualization; exploitation and research on fluoride retention of high efficiency and low-cost; studies of fluoride retention by modified treatment; industrial tests of combustion fluoride retention technology.Firstly, characteristic and harm of fluoride pollution by coal combustion were reported, and there are some problems of coal pollution control.Secondly, based on systems analysis of all kind of fluorin measure method, high frequency induction furnace / the Fluoride Ion-Selective Electrode (ISE) is the best measure method.Afterwards, the microcosmic pore structure characteristic of fluoride retention is the key factor affecting fluoride retention efficiency during coal combustion. The effects of temperature, time of calcinations, species, particle sizes on pore structure characteristic of fluoride retention additive were studied. Surface forms of fluoride retention additive were studied, also.Using iron, aluminium compound and industrial waste as additives for calcium based fluoride retention is an effective way to save energy and reduce air pollution. Some new type additives were developed.The characteristics of fluoride retention modified treatment by metal and acid compound as additives were investigated in this paper. Surface forms of fluoride retention additive were studied to find their fluoride retention mechanism.At last, through lots of industrial tests and application of coal powder furnace, the two-stage technology was put forward originally. In addition, the method of fluoride measure at industrial pollution was improved.