磷石膏-废氨水对CO_2矿化能力的研究

利用磷石膏和废氨水对二氧化碳(CO_2)进行矿化反应,研究反应温度、反应时间、液固比、氮硫物质的量之比、CO_2流量、搅拌转速、水洗预处理次数等因素对磷石膏-废氨水体系矿化CO_2能力的影响。通过实验确定最佳反应条件:反应温度40℃、反应时间60 min、液固比8.0 m L/g、氮硫物质的量之比2.4、CO_2流量500 m L/min、搅拌转速300 r/min、水洗预处理次数3次。在此条件下,磷石膏-废氨水对CO_2的矿化能力可达到100g磷石膏固定CO_223.60 g。

Study on mineralization ability for CO2 of phosphogypsum-waste aqueous ammonia

Based on the mineralization reaction of phosphogypsum and waste aqueous ammonia with CO2, the influence of different factors on the mineralization ability are studied including reaction temperature, reaction time, liquid-solid ratio, nitrogen-sulfur ratio, CO2 flow, stirring speed and pre-washed with water. The experimental results show that the optimum conditions are as follows:reaction temperature is 40℃, reaction time is 60 min, liquid-solid ratio is 8.0 mL/g, nitrogen-sulfur ratio of amount of substance is 2.4, CO2 flow is 500 mL/min, stirring speed is 300 r/min and pre-washed with water is 3 times. Under the optimum conditions, the mineralization ability for CO2 of phosphogypsum-waste aqueous ammonia can achieve to 23.60 g CO2 per 100 g phosphogyspum.