【摘要】 为了最大限度地对污泥进行回收利用,将钢厂冷轧废水处理后污泥铬回收后的残渣制备成脱硫剂,并研究其脱硫特性。结果表明,加入碳酸钠在高温下有氧焙烧,冷轧废水处理后污泥铬回收后的残渣中Fe2O3约为45%(质量分数),Fe2ZnO4约为6%(质量分数);将该残渣与粘结剂、制孔剂和结构剂按一定配比混合制备脱硫剂,在空速为400~500 h-1和不持续补充水分的实验条件下,与含3 500 mg/m3左右H2S的模拟气接触时,一次脱硫实验表明其穿透硫容在5%以上。更多还原

【Abstract】 The high Fe content cold roll steel plant wastewater sludge may be recycled to produce the desulfurizer for removing H2S from methane generated from anaerobic digestion processes.To allow max recycle of the sludge,most of the Cr content was first removed by mixing the sludge with Na2CO3 and roasted at 900 ℃ and then leaching with water.The sludge residue was made of Fe2O3(45% wt),Fe2ZnO4(6%) and minor components.The residue was mixed with CaO and pore forming agents and then pelletized to form two desulfurizers,No.1 with wood powder(9.97%) and No.2 with no wood content.Gas phase adsorption breakthrough experiments were performed to compare the desulfurizers’ effectiveness in removing H2S from the N2 based feed stream.The experimental results showed that both desulfurizers were highly effective for removing H2S from the influent containing 3 500 mg/m3 H2S in a fixed bed reactor achieving high loading capacities at a space speed of 400-500 h-1.The loading capacity was higher using the wood containing desulfurizers(6.53% vs.5.44%) due to its higher porosity,and the capacities increased with the moisture content of the influent.The used desulfurizers were partially regenerated after resting for 20 days as evidenced by the distinct breakthrough curves showing much lower capacities relative to the new forms.XRD diagrams were obtained for the sludge,new and used desulfurizers.更多还原