碱性活化剂对镁渣基复合脱硫剂脱硫效果的影响

为了充分利用资源，降低脱硫成本，利用传统皮江法冶镁工艺中产生的大量镁渣为基质，以冶镁回转窑除尘器中过滤产生的粉尘和冶镁原材料白云石矿石为辅料，按一定比例混合制备湿式脱硫法脱硫剂，研究镁渣、粉尘、单一矿石、两者混合以及三者混合作为脱硫剂的脱硫效果。结果表明:当m（镁渣）:m（粉尘）:m（矿石）=10:0.3:0.035时脱硫效果最佳，此时复合脱硫剂水溶液（10.335 g/100 mL）可消耗1 mL/L的稀H₂SO₄ 67.58 mL。为进一步提高其脱硫效果，添加碱性活化剂（Na₂CO₃、NaOH），发现NaOH活化效果较好，当ω（NaOH）加入量为2.0%时，复合脱硫剂可消耗稀H₂SO₄ 214.42 mL，是未活化之前的3.17倍。SEM观察结果显示，加入活化剂后，复合脱硫剂反应面积明显增加。经活化后的镁渣基复合脱硫剂可用于烟气湿式脱硫，实现了镁渣的资源化利用，达到“以废治废”的目的，具有很好的市场化前景。

IMPACT OF ALKALINITY ACTIVATE AGENT ON DESULFURIZATION EFFECT OF MAGNESIUM SLAG BASE COMBINED DESULFURIZATION AGENT

In order to fully use of resources and reduce desulfurization cost, a large quantity of magnesium slag generated from the traditional technology was used to produce magnesium by Pidgeon process as the base. And we utilized the filtering generated powder dust in magnesium production gyration kiln dust wiper and magnesium production raw material dolomite as accessories and mixed at a certain ratio to manufacture the desulfurization agent for wet desulfurization,and researched the desulfurization effect of magnesium slag, powder dust, mineral in single, and mixed with each other and together as the desulfurization agent. The results proved that, the best desulfurization effect was achieved when magnesium slag:powder dust:mineral=10:0.3:0.035(mass ratio), then the combined desulfurization agent water solution (10.335 g/100 mL) could consume 67.58 mL dilute sulphuric acid with concentration of 1 mL/L. Alkalinity activate agent (Na₂CO₃, NaOH) was also added for further improving the desulfurization effect. The results showed that NaOH had better activate effect, then the combine desulfurization agen could consume 214.42 mL of dilute sulphuric acid when add 2% NaOH, which was 3.17 times of that before activation. SEM results showed that reaction area of composite desulfurization agent obviously increased after adding activate agent. The activated magnesium slag based composite desulfurization agent could be used for wet desulfurization of flue gas, which could realize the resource utilization and achieve the purpose of treating waste with waste, also have a good market prospect.