复合还原剂还原分解磷石膏制取高浓度二氧化硫
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摘要
采用高硫煤与煤矸石制备成复合还原剂还原分解磷石膏,研究了还原剂配方及粒度、n(C)/n(S)(生料中碳与三氧化硫物质的量比)、反应温度对炉气二氧化硫体积分数、磷石膏硫酸钙分解率和脱硫率的影响。结果表明:复合还原剂配方、反应温度、还原剂粒度对二氧化硫的体积分数都有影响。采用高硫煤与煤矸石的质量比为2∶1的复合还原剂,在n(C)/n(S)为0.7、还原剂粒径为111~122μm、温度大于1 000℃时,二氧化硫体积分数可达16.02%,与采用单一高硫煤作为还原剂相比,二氧化硫体积分数能提高1.46%。采用复合还原剂工艺有利于降低反应温度,提高二氧化硫体积分数和磷石膏分解率及脱硫率,可为煤矸石、磷石膏综合利用开发一条新途径。
A compound reducing agent has been prepared to deoxidize phosphogypsum with high-sulphur coal and coal gangue as starting materials.Effects of the formula and particle size of compound reducing agent,value of n(C)/n(S)(amount-of-substance ratio of carbon and sulfur trioxide in raw material)and reaction temperature on the volume fraction of sulfur dioxide,decomposition rate of calcium sulfate in phosphogypsum,and on the desulphurization rate were studied.Results showed that all the formula and paritcle size of compound reducing agent,and reaction temperature have influences on volume fraction of sulfur dioxide.Volume fraction of sulfur dioxide could reach 16.02%,when adopting the compound reducing agent of which the mass ratio of high-sulphur coal and coal gangue was 2∶1,n(C)/n(S) was 0.7,particle size was 111～122 μm and temperature was higher than 1 000 ℃.Compared with single high-sulphur coal as reducing agent,volume fraction of sulfur dioxide was increased by 1.46%.Using compound reducing agent to deoxidize phosphogypsum is propitious to reducing reaction temperature and increasing volume fraction of sulfur dioxide,decomposition rate of calcium sulfate in phosphogypsum,and desulphurization rate.It develops a new way for comprehensive utilization of high-sulhur coal and coal gangue.
A compound reducing agent has been prepared to deoxidize phosphogypsum with high-sulphur coal and coal gangue as starting materials.Effects of the formula and particle size of compound reducing agent,value of n(C)/n(S)(amount-of-substance ratio of carbon and sulfur trioxide in raw material)and reaction temperature on the volume fraction of sulfur dioxide,decomposition rate of calcium sulfate in phosphogypsum,and on the desulphurization rate were studied.Results showed that all the formula and paritcle size of compound reducing agent,and reaction temperature have influences on volume fraction of sulfur dioxide.Volume fraction of sulfur dioxide could reach 16.02%,when adopting the compound reducing agent of which the mass ratio of high-sulphur coal and coal gangue was 2∶1,n(C)/n(S) was 0.7,particle size was 111～122 μm and temperature was higher than 1 000 ℃.Compared with single high-sulphur coal as reducing agent,volume fraction of sulfur dioxide was increased by 1.46%.Using compound reducing agent to deoxidize phosphogypsum is propitious to reducing reaction temperature and increasing volume fraction of sulfur dioxide,decomposition rate of calcium sulfate in phosphogypsum,and desulphurization rate.It develops a new way for comprehensive utilization of high-sulhur coal and coal gangue.
引文
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