查询词典 calcium carbonate

There were many kinds of salinities industfall, and it was an approach of the salinity accumulation of soil.7.The content of organic compound in the dustfall in Tarim Basin were reduced from north to south,east to west. Dustfall was an approach that calcium carbonate and calcium sulphate to be increased, butthe content of calcium carbonate and calcium sulphate were different in each heights and sites.

降尘中含有多种盐分，是土壤积盐的一个途径。7 塔里木盆地降尘中的有机质含量由北至南、由东至西逐渐减小，降尘是碳酸钙、硫酸钙增加的一个途径，不同观测点及不同高度的降尘中的碳酸钙、硫酸钙的含量是不同的。

Various powder fillers are: ultra-fine barium sulfate, barium sulfate modified ultra-fine, mica, magnesium strong powder, calcium carbonate, talc, high light calcium, calcium extinction, high optical barium, barium extinction, precipitated barium sulfate, calcined kaolin, Featured washed kaolin, titanium dioxide, lithopone, ultra-white light calcium carbonate and so on.

各种粉体填充料有：超细硫酸钡，超细改性硫酸钡，云母粉，镁强粉，碳酸钙，滑石粉，高光钙，消光钙，高光钡，消光钡，沉淀硫酸钡，煅烧高岭土，精选水洗高岭土，钛白粉，立德粉，超白轻质碳酸钙等等。

At present, several common sources of calcium, the calcium carbonate to the highest calcium content of the elements as much as 40 percent, much higher than calcium citrate, calcium lactate, calcium gluconate, dicalcium phosphate, calcium hydride.

目前常见的几种钙源中，以碳酸钙的元素钙含量最高，高达40%，大大高于柠檬酸钙、乳酸钙、葡萄糖酸钙、磷酸氢钙、氢化钙等。

The experiments show that one portion of amino organic compounds in the shell is changed to the volatilizable amine and the other portion is transformed to the involatile nitrate after pyrogenation.The organic compounds disappear completely at 600℃.They also show that the aragonite phase of calcium carbonate in pearl shell chang with temperature;the aragonite phase transforms to calcite at 500℃, but some of organic compounds is still residual;and calcium carbonate begins to decompose to calcium oxide at 600℃.

实验发现，贝壳中的氨基酸类有机物热降解后部分以胺的形式挥发出来，另一部分则转化为不可挥发的硝酸盐的形式，600℃有机物完全消失；同时，贝壳碳酸钙的文石晶相随温度而变化，500℃时转变为方解石结构，其中仍有部分有机物残留，600℃开始分解为氧化钙。

The calcium sulfate was dissolved and led to the rapid increase of calcium ion concentration in the solution. So the calcium sulfate is not suitable for being seed crystal of low-salt concentration. The quartz sand and calcium carbonate both can be used as seed crystals, but it is much faster and more complete to use calcium carbonate as seed crystal compared with using quartz sand.

当硫酸钙加入处理液中发生了硫酸钙溶解现象，导致溶液钙离子浓度迅速增加，故硫酸钙不适合做低浓度盐水的晶种，而石英砂和碳酸钙均能对钙离子的结晶起到效果，但碳酸钙做晶种对钙离子的结晶更快捷、更彻底，在条件允许的情况下，采用碳酸钙做晶种为宜。

If conditions allow, it is better to use calcium carbonate. Using calcium carbonate as seed crystal, adjusting pH values of solution by alkali, the process of the crystallization of calcium ion in reverse osmosis water under different pH values, seeds and their dosage, also different mixing speeds was examined.

用碳酸钙做晶种，通过加碱调节溶液pH值，考察了不同pH、不同晶种及其投加量、不同搅拌速度下钙离子的结晶过程，确定了pH值是影响钙离子结晶的主要因素，而搅拌速度、晶种及其投加量在一定程度上亦对钙离子结晶有影响。

Calcium carbonate whiskers were synthesized by using industrial waste phosphogypsum as raw materials.Calcium carbonate crystal form was characterized by microscope and electron-scanning microscope,XRD and FTIR analysis was employed to investigate the morphology of calcium carbonate whiskers.

论文摘要以废弃磷石膏为原料制备碳酸钙晶须，利用显微镜和扫描电镜观察晶体形貌，晶须样品的晶型用X衍射和红外光谱进行了表征。

The synthetic technologies of calcium carbonate whiskers are reviewed, most of which are carried out in the normal gravity environment by adding some kind of morphology-control additive or needle-like crystal seeds of calcium carbonate supplemented with certain phosphate so as to prompt the crystal of calcium carbonate whiskers to grow in a certain direction to the reaction system.

摘 要：晶须碳酸钙的合成技术备受关注，其中绝大多数方法是在常重力场中，通过向反应物系中添加某种晶形控制剂，或预先添加针状碳酸钙晶种，并辅以能够促使碳酸钙晶体沿单一方向生长的磷酸系助剂。

The scale inhibition performance of PASP-based composite on both calcium carbonate and calcium sulfate was investigated under different conditions.The calcium carbonate crystal samples were characterized by SEM technique,and the results showed that the PASP-based composite cou...

利用扫描电子显微镜对碳酸钙晶型进行了分析，结果表明：聚天冬氨酸复配物可使碳酸钙晶体发生明显的扭曲现象，碳酸钙结晶更加细小分散。

To investigate the effects of serum calcium and phosphorus on the model of calcium-deficient laying ducks, one hundred and twenty Shan sheldrakes were allocated into normal diet, half calcium carbonate and quarter calcium carbonate groups randomly. Serum calcium and phosphorus were detected by automatic biochemistry analyzer one day before and one, three and five weeks after fed with above diets.

将120只600日龄产蛋山麻鸭随机分为正常日粮组、1/2石粉组和1/4石粉组，自动生化分析仪测定更换饲料前1 d及更换饲料后1、3、5周血清钙、磷水平，观察缺钙日粮对蛋鸭血清钙、磷的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。