酸性氧化物

结论在现有除尘设备条件下的冶炼厂烟尘污染为多种重金属、酸性氧化物及几十种有机污染物（酚类及PAHs）的复合污染，它们的粒径分布大多≤11μm。

Conclusion On the existing condition of existing dedust equipment , the compound contamination in aerosol of metallurgical plant were multiple kinds of heavy metals , acidic oxide and tens of kinds of organic contaminations ( hydroxybenzene and PAHs ), and their radius ≤ 1.1 μ m.

考察了酸性氧化物Si02、碱性氧化物MgO、中性氧化物Al203作为添加剂对碱金属析出行为的影响。

The effects of acidic oxides SiO2 , alkali oxides MgO , neutral oxide Al2O3 as additives on the alkali metal emission were investigated .

以三羟甲基丙烷（TMP）与油酸（OA）为原料，以固体非酸性氧化物为催化剂，采用直接酯化法，合成出了三羟甲基丙烷油酸酯（TMPOE）。

A trimethylolpropane easter was obtained by directly esterification , with trimethylolpropane and oleic acid , using ZnO as catalyst .

实验结果表明，添加碱土金属氧化物的γ-Al2O3催化剂的催化活性比添加酸性氧化物的γ-Al2O3催化剂的催化活性高，其中以MgO质量分数为20%的MgO/γ-Al2O3催化剂的催化活性最高。

Higher catalytic activities were achieved by adding alkaline-earth metal oxides to γ - Al_2O_3 , among which the catalytic activity of adding 20 % ( mass fraction ) of MgO was the best .

其次，虽然CaO具有较大的水容量，但CaO含量过高更有利于向钢液中渗氢，而Al2O3作为酸性氧化物而存在，有利于阻止氢的渗透。

Secondly , though CaO has bigger water capacity , the higher CaO content in slag attributes to increasing hydrogen content in steel . Whereas , Al2O3 is advantaged for preventing hydrogen permeation for its low water capacity and exists as acid oxide .

熔融渣中碱性氧化物和酸性氧化物的含量基本相同，碱度接近于1.0；

In melted slags , alkaline oxide content is basically similar to that of acidity oxide , and the alkalinity is close to 1 ;

煤灰的熔融特性不仅与煤灰的化学组成有关，还与灰成分的矿物形态有关，其中酸性氧化物可提高煤灰熔融温度，碱性氧化物却呈现降低煤灰熔融温度与助熔剂的作用。

Coal-ash fusibility exhibits corresponding relations to its chemical composition and mineral composition , in which acidic oxides can increase the ash fusion temperature , but the basic oxides play a role in helping fusion and can reduce the ash fusion point .

实验结果表明：超临界流体萃取再生废润滑油过程具有较好的脱除酸性变性氧化物及残留添加剂的能力。

The experimental results show that the method has higher selectivity of removing the oxide and the residual additives .

结论：碱性催化剂优于路易斯酸性催化剂，金属氧化物催化适合于工业化生产。

CONCLUSION : Basic catalysis is superior to Lewis acid catalysis . Using metal oxide is suitable for industrialization .

由于磷酸盐的化学特性使其极易被酸性土壤中铁铝氧化物及石灰性土壤中的碳酸钙化合物固定，因此，虽然土壤中全磷含量较高，但能够提供给作物利用的有效磷浓度非常低。

However , the soil with affluent total phosphorus could offer the crops very little effective phosphorus because most of phosphorus is apt to be fixed by Fe and Al oxides in acid soil and calcium carbonate compound in calcareous soil .