碳酸钙

Chapter 8 discusses an extension work, which involves the biomimetic synthesis of calcium carbonate.

第八章是一个拓展性的研究工作，涉及碳酸钙的仿生合成。

Dimethyl N-cyanodithioiminocarbonate was facilely synthesized from calcium cyanamide, sodium carbonate and carbon disulfide, using dimethyl sulfate as a methylating agent in aqueous phase with an overall yield of 72% and purity of 99%.

用氰氨化钙、碳酸钙和二硫化碳等为原料，硫酸二甲酯为甲基化试剂，采用水相合成工艺制得荒酸二甲酯，总收率72%，纯度99%。

The result shows, light calcium carbonate mixed in the proportion of 1:20 and 1:16, it is not only economy but also efficacy.

结果表明，森得保：轻质碳酸钙为1：20，1：16的配比既经济、效果又好。

The results indicated that Sendebao and light calcium carbonate mixed at the proportion of 1∶20,1∶15 and 1∶10 could kill 90.96% of pests.

结果表明：森得保与轻质碳酸钙1∶20，1∶15，1∶10配置比例杀虫效果达90.96%以上，其中1∶15配置最适合竹林间大面积防治竹织叶野螟。

Therefore the preparation of light calcium carbonate, which has a big market demand, will become a good approach of the comprehensive treatments of calcium carbide residue.

因此利用电石渣生产市场需求量大的轻质碳酸钙，无疑是电石渣综合治理很好的途径。

The results showed that Sendebao raw dust and light calcium carbonate mixed in the proportion of 1∶20 and 1∶16 in weight were effective and economic,and the control effect reached 91.89 % and 93.63 % respectively.

试验结果表明，用森得保与轻质碳酸钙之比为1∶20，1∶16的配比剂既经济、效果又好，其林间杀虫效果依次为91.89%、93.63%，为大面积防治刚竹毒蛾提供了可靠的依据。

Its main product is light calcium carbonate with annual output 50000tons.

衢州银河钙业有限公司成立于2002年，占地面积60亩，现有职工45人，主要生产轻质碳酸钙产品，年产量5万吨。

Taking light calcium carbonate as an example,in order to make its manufacturers understand the measures——how to enhance the product′s whiteness from theories to practice,this paper fully expatiated on various effecting factors of chemical whitening ,process of chemical whitening ,establishmen.

以轻质碳酸钙为例，为了使生产企业从理论到实践对提高白度的途径有所了解，对化学增白的影响因素、化学增白程序、制定化学增白方案的原则、实验室试验筛选最优方案、工业试验的方法进行了全面阐述，并提出几点行之有效的注意事项，以保证化学增白达到预期效果。

This paper relates the basic property of calcium carbonate which affects the processingperformance of rubber and mechanical properties of cured compound, and briefly introduces theapplication of heavy calcium、light calcium、 active calcium and nano-calcium used in rubber goods.

本文论述碳酸钙基本性质对橡胶加工工艺性能和硫化胶力学性能的影响，对重钙、轻钙、活性钙或纳米钙在各类橡胶制品中的应用亦作简要介绍。

Sodium chloride-common table salt-is the most familiar salt; sodium bicarbonate, silver nitrate, and calcium carbonate are others.

氯化钠是最熟悉的盐；其它熟悉的盐类有碳酸氢钠、硝酸银以及碳酸钙。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。