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Figure 2. Nitrogen oxide emissions were reduced from 90 mg/m3


to 20 mg/m3 .


图2:氮氧化物的排放浓 度从90 mg/m3 。


mg/m3 降低到20


the molding line dropped from 0.6% to 0.2%. Sulfur and nitrogen oxides pollutants in the separated


casting and cooling area were measured on the same mold box in 2010 and in 2012. Measurements conducted on persons confirmed the


results from the casting line. Te concentration of SO2 was reduced from a value of 2.1 mg/m³ to approximately 0.15 mg/m³ by using the new binder system. Te nitrogen oxide emissions were reduced from 1.3 mg/m³ to a concentration of 0.5 mg/m³. Te sulfur content decreased from an average value of 0.1% to 0.07%. Tis contributes to the reduction of the SO2 concentration in the casting gases and helps to secure good casting quality. Te concentration of nitrogen in the reconditioned old


sand decreased from 0.13% to 0.07%. Te low nitrogen con- tent in the binder and the reclaimed sand reduces the risk of pinholes forming on the casting surface, and, as shown by the chemical analysis of the casting gases, significantly reduces the emission of dangerous nitrogen oxides into the ambient air during casting. Te odor concentration was measured inside the separate


pouring and cooling area and in its immediate vicinity. Te results of the measurements with ASKURAN RS and RS hardener were compared with the measurement values from 2007 (Table 1). On the furan resin line inside the foundry, the odor level


was reduced between 14% and 80%, depending on the measuring point. Considerable reduction of unpleasant odors were observed during casting


域和冷却区域的硫氧化物和氮氧化物产生量进行了测 量。


铸造生产线的作业人员对测量值的结果进行了确 认。通过采用新的粘结剂系统,二氧化硫的排放浓度 从2.1 mg/m³降低到约0.15 mg/m³。氮氧化物排放 浓度从1.3 mg/m³降低到0.5 mg/m³。 含硫量从平均0.1%降低到0.07%,有助于降低铸件 气体中二氧化硫的浓度,并保证了铸件质量。 旧砂处理中氮的浓度从0.13%降低到0.07%。粘 结剂中较低的氮含量和再生砂不仅降低了铸件表面气 孔形成的风险,此外,如铸造排放气体的化学分析所 示,它还显著降低了铸造过程中有害氮氧化物在大气 中的排放。


分别对浇注和冷却环节以及附近位置的气味浓度进 行了测量。使用ASKURAN RS和RS固化剂的测量结 果与2007年的测量值进行了对比(表1)。 在铸造厂的呋喃树脂生产线上,不同测量点的气味 水平可降低14%到80%。铸造和冷却工位(铸造后的 1-2小时)所测量到的异味减少是非常可观的。


2007年,在离铸造 厂较远的周边测量到


Figure 3. After the conver- sion of the binder quality, the odor concentration was reduced considerably (2007 vs. 2012).


图3:改变粘结剂品质后, 气味浓度显著降低(2007 年与2012年对比)。


June 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 71


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