Preparation of Composite Flocculant by Resource Utilization of Titanium Smelting Wastewater
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摘要:
以熔炼钛渣酸洗提质降杂过程中产生的盐酸、硫酸体系废水为原料，在不同的pH值、SiO2聚合时间、Fe3+补加量等条件下制备复合絮凝剂。在盐酸体系下，溶液pH值为3.0，常温下SiO2聚合时间4 h，FeCl3·6H2O加入量50.0 g/L，NaClO3加入量5.0 g/L的条件下制备出盐酸体系聚合硅酸铝铁钛絮凝剂(PSAFTC)，对模拟浊液的平均除浊率为95.62%。在硫酸体系下，溶液pH值为1.30，Fe2(SO4)3补加量50.0 g/L，NaClO3加入量5.0 g/L的条件下制备出硫酸体系聚合硅酸铝铁钛絮凝剂(PSAFTS)，对模拟浊液的平均除浊率为96.99%。PSAFTC絮凝剂的除浊保质期可高达90 d，而PSAFTS絮凝剂的除浊保质期仅7 d，但前者的除浊效果略低于后者。利用熔炼钛渣提质降杂产生的废水制备絮凝剂属于废物的循环再利用，具有显著的经济效益和环境效益。
Abstract:Two kinds of wastewater generated in the decontamination of smelting titanium slag by hydrochloric acid and sulfuric acid washing respectively were utilized as raw materials, and composite flocculants were prepared at different pH values, polymerization durations of SiO2 and recruitment amounts of Fe3+. The average turbidity removal rate of the polysilicate aluminum ferrite titanium flocculant (PSAFTC) on simulated turbid solution prepared at hydrochloric acid system with solution pH value of 3.0, SiO2 polymerization time of 4 h at room temperature, FeCl3-6H2O incorporation of 50.0 g/L and NaClO3 incorporation of 5.0 g/L was 95.62%. The average turbidity removal rate of the polysilicate aluminum ferrite titanium flocculant (PSAFTS) on simulated turbid solution was 96.99% when prepared at the conditions of sulfuric acid system, solution pH value of 1.30, Fe2(SO4)3 addition of 50.0 g/L, and NaClO3 addition of 5.0 g/L. The shelf life of the PSAFTC flocculant can reach 90 days, while that of the PSAFTS flocculant is only 7 days. However, the turbidity removal effect of the former is slightly lower than that of the latter. This paper focuses on preparation of flocculant agents from the wastewater generated from the decontamination of smelting titanium slag. The introduced method possesses significant economic and environmental benefits.
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表 1 熔炼钛渣化学成分单位：%
Table 1. Chemical composition of smelted titanium slags
TiO2 TFe V2O5 SiO2 Al2O3 CaO MgO MnO S 58.16 3.29 0.77 11.06 11.43 2.83 6.70 0.99 0.12 
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表 2 钛渣除杂废水成分单位：g/L
Table 2. Titanium slag decontamination wastewater composition
Ti4+ Fe3+ SiO32- Al3+ Ca2+ Mg2+ pH值 盐酸体系 0.46 2.00 30.91 5.61 1.14 1.01 0.91 硫酸体系 0.63 2.37 31.54 6.03 0.99 1.19 1.20
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表 3 PSAFTC综合条件实验
Table 3. PSAFTC integrated condition test
除浊率/% 96.84 94.71 95.31 平均除浊率/% 95.62
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表 4 PSAFTS综合条件实验
Table 4. PSAFTS integrated condition test
除浊率/% 96.58 95.87 98.53 平均除浊率/% 96.99
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