碳酸钙

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。

LIU Zhenfa,WANG Yanji,TIAN Caili,ZHANG YanheThe influences of polyaspartic acid alone,magnetic field alone,and their synergism on the crystal forms of calcium carbonate and the scale inhibition performance were investigated.

研究了单独使用环保型高分子聚合物——聚天冬氨酸、磁场以及磁场与聚天冬氨酸的协同作用对碳酸钙晶型和阻垢性能的影响。

Initial and oxidized sodium alginates were ionically cross-linked withCaCO3-GDL (D-glucono-δ-lactone).

采用碳酸钙-葡萄糖酸内酯作为复合离子交联体系制备了海藻酸盐以及氧化海藻酸盐水凝胶。

Calcium carbonate occurs in the allomorphs calcite and aragonite.

碳酸钙存在于同质异晶的方解石和文石中。

Calcium carbonate occurs in the allomorphs calcite and aragonite.

同质异晶的方解石和文石中含有碳酸钙。

The raw material is the prepared glass which come from the first process, and the bubblier (CaCO3), the stabilizer (Na3PO4-12H2O).

二次烧结是制备泡沫玻璃的过程，原料采用一次烧结的玻璃粉为主要原料，碳酸钙(CaCO_3)为发泡剂，磷酸钠(Na_3PO_4·12H_2O)为稳定剂。

Covered with caliche, a hard calcium-carbonate encrusted soil.

被硝酸钠，和硬碳酸钙覆盖的土壤。

By using centrifugation to impurity elimination, we determined the dosage of supplemental material in the formulation of the tablets as follows: 1 time calcium carbonate, dextrin 10%, microcrystalline celluloses 0.5%, and magnesium stearate 0.3%.

最佳提取工艺为药材加10倍量的水，浸泡1.0 h，回流提取2次，每次1.0 h，采用离心法除去杂质，每个处方的辅料用量为：1倍量的碳酸钙，质量分数为10%的糊精、0.5%的微晶纤维素和0.3%的硬脂酸镁。

Some will no doubt flourish, but if the trend continues, as it will for at least some decades, clams, mussels, conches and all creatures that grow shells made of calcium carbonate will struggle.

某些生物无疑会繁盛，但是如果这一趋势继续下去，当它至少持续几十年后，蛤、贻贝、海螺和所有生有碳酸钙外壳的生物将生存困难。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。