查询词典 alkali metals

The preventive measures for the harmful defects of alkali metals are as follows: 1, reducing the alkali metals content in the raw materials; 2, increasing the MgO content of the sinter , decreasing the basicity of slag , decreasing the Si content of the pig iron, increasing relative slag volume; 3 , introducing prereduced ore pellets or partly reducted sinter; 4increasing the ability of coke resisting alkali metals; 5, using refractories that have the ability of resisting corrasion of alkali metals; 6 , cleaning the blast furnace periodically. The above recommendations are necessary for decreasing the circulation and accumulation of alkali metals effectively in blast furnace, reducing the harmful influence of alkali metals on blast furnace, increasing the smelting intensity, decreasing the coke rate, improving the gas permeability.

基于碱金属对高炉冶炼的上述危害，本文结合湘钢高炉的实际生产情况，通过理论分析、计算以及其他钢厂防治碱害的经验，提出防治高炉碱害的措施：1、减少入炉原、燃料的碱金属含量；2、提高烧结矿中的MgO含量、降低炉渣碱度、降低生铁含硅量、适当增加渣量；3、采用预还原的金属化球团或部分还原的烧结矿；4、提高焦炭的抗碱能力；5采用抗碱侵蚀的耐火材料；6、周期性性洗炉，以有效地减少碱金属在高炉内的循环富集，降低碱金属对高炉的危害，提高高炉的冶炼强度，降低焦比，改善高炉透气性。

Results show that, following the leaching time extending, the leaching concentrations of heavy metals and lixiviate toxicity of heavy metals increase in the fly ash. When the ratio of liquid and solid add, the leaching concentrations of heavy metals obviously become big, and the Cd's leaching concentration is the biggest, when the ratio of liquid and solid is 90, the Cd's leaching ratio exceed the percent of 70. At the time pH is about 7, the leaching concentrations of heavy metals are the lowest. When the grain size is the bigger or little, the leaching concentrations of heavy metals are lower, however when the grain size is 250-900 μm, the concentrations are higher. After fly ash melt in the high temperature, the lixiviate toxicity of heavy metals greatly reduce, which explains that the effect of melting on heavy metals' stabilization is very good.

结果表明，随着浸出时间的增加，飞灰绝大部分重金属的浸出浓度增高，浸出毒性增强；液固比增加，大部分重金属的浸出率大大提高，其中重金属Cd的浸出率最大，在液固比为90时，飞灰中的Cd的浸出率达到70%以上；pH为中性左右的时候，医疗垃圾飞灰中的大部分重金属的浸出液浓度最低；颗粒尺寸在较大或者较小时，医疗垃圾飞灰中的大部分重金属浸出浓度较小，大部分重金属在颗粒尺寸250～900 μm时，重金属的浸出浓度较高；飞灰高温熔融后，重金属的浸出毒性大大降低，说明熔融对重金属有很好的固化效果。

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In the alkali-boron-silicon system basic fluxing agent,we use the combined effects of alkali metals,alkali earth metals and admixture s to replace lead,in order to produce environment-protecting unleaded fluxing agent for overglaze colors with low bismuth.

在碱-硼-硅系统基础熔剂中引入外加剂，通过多种碱金属、碱土金属及外加剂等复合效应来代替铅在熔剂中的作用进而研制低铋环保型无铅熔剂。

According to the composting principle and the correlation between the forms of heavy metals and biological efficiency, combining with the controlling means of heavy metals' activity, this test studied the effect of passivation reagents including fly ash, phosphorate rock, zeolite, peat and lime on the forms and the biological efficiency of heavy metals; and the different perception of different passivation reagents were screened and optimized. Basing on the study, the adsorption mechanism of passivation reagents on heavy metals in sewage sludge composting was discussed, and the transformation mechanism of organic forms of heavy metals was also studied through some methods including dialysis and G-75 gel chromatogram separation etc.

本研究根据固体废弃物的堆肥化原理及重金属的不同形态与生物有效性的关系，结合污泥中重金属活性的控制方法，研究了在污泥堆肥中添加粉煤灰、磷矿粉、草炭、沸石和石灰对重金属的形态及重金属的生物有效性的影响，并对不同钝化剂的不同配比进行了筛选和优化；在此研究基础上，探讨了污泥堆肥中钝化剂对重金属的吸附机理，运用透析及G-75凝胶色谱分离等方法研究了污泥堆肥中重金属有机形态的转变机理。

The invention relates to a continuous process for recovering caprolactam from aqueous caprolactam product, said aqueous caprolactam product comprising caprolactam, impurities, and water, said process comprising: adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol alkali hydroxide per kg of caprolactam; reacting at least part of the added alkali hydroxide to form alkali amino caproate, to obtain a caproate-enriched caprolactam product; and distilling the caproate-enriched caprolactam product at reduced pressure.

本发明涉及从含水己内酰胺产物中回收己内酰胺的连续方法，所述含水己内酰胺产物包括己内酰胺，杂质，和水，所述方法包括：以不超过100mmol碱金属氢氧化物/kg的己内酰胺的量将碱金属氢氧化物加入到含水己内酰胺产物中；让所添加的碱金属氢氧化物的至少一部分起反应，形成碱金属氨基己酸盐，以获得了富含己酸盐的己内酰胺产物；和减压蒸馏富含己酸盐的己内酰胺产物。

By the medium of experiment and research to alkali-aggregate reaction of Shan XI Face Concrete,We discussed respectively from total alkali in concrete, alkali reactiveness of aggregate and damp environment that alkali-aggregate reaction may be damaged.

提要：本文通过珊溪面板混凝土碱骨料反应的试验研究，分别从混凝土总碱量，骨料的碱活性及发生碱骨料反应破坏的潮湿环境进行了论述，认为珊溪面板混凝土是安全的，不会发生碱骨料破坏。

The alkali dosage depends mainly on the constituents and property of material and the quality requirements for pulp: more alkali dosage will speed up cooking process, reduce the hardness of pulp and improve the bleachability of pulp; but excessive alkali dosage will lower the pulp yield and physical intensity, while too less alkali dosage will result in harder and darker pulp, uneasy to bleach, too much screenings, and even extending cooking time cannot guarantee the reaction of delignification.

用碱量主要取决于原料的组成和性质及对纸浆的质量要求：加用碱量有利于加快蒸煮速度降低纸浆硬度和提高纸浆的可漂性：但过高却会降低纸浆得率和物理强度，如过低时，成浆较硬而色暗，不易漂白而且筛渣多即使延长蒸煮时间也难以保证脱木素反应进行。

Detailed geology- petrology-mineralogy study shows that late Triassic-early Jurassic granites can be divided into 4 groups: granodiorites, monzonitic-K syenogranites mainly, alkali feldspar-alkali granites and syenite, Middle Jurassic granites is composed of quartz diorites-granodiorites and monzonitic granites, the main rock type includes granodiorites and monzogranites; Early Cretaceous granites include alkali gabbro, alkali granites and granodiorites, and these rocks composed bimodal igneous rock group.

详细的地质-岩石矿物学研究表明，晚三叠-早侏罗世花岗岩可以划分成四种岩石组合，即花岗闪长岩组合、二长花岗岩—正长花岗岩组合、碱长花岗岩—碱性花岗岩组合和正长岩组合，其中以二长花岗岩—正长花岗岩组合为主；中侏罗世花岗岩由石英闪长岩-花岗闪长岩组合和二长花岗岩组合构成，岩石类型以花岗闪长岩和二长花岗岩为主；早白垩世出现了碱性辉长岩、碱性花岗岩和花岗闪长岩，构成双峰式火成岩组合。

Our main products are alkali, alkali-free glass fiber rovings Plaid, 7628 electronic-grade glass fiber cloth, in the alkali, alkali-free glass fiber grid cloth and so on.

本厂主要产品有中碱、无碱玻璃纤维无捻粗纱方格布，7628电子级玻璃纤维布，中碱无碱玻璃纤维布和网格布等。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。