1.The formation mechanism of mash scale is the following: slightly soluble or soluble substances in hypersaturated state separate out during distillation, soluble calcium salt converts into calcium carbonate scale or soluble calcium salt resolves into indissoluble calcium carbonate scale by heating.
摘要醪垢的形成因素有：微溶或可溶物质在蒸馏过程中处于过饱和状态而析出；可溶性钙盐转化成碳酸钙垢；可溶性钙盐受热分解生成难溶碳酸钙垢；前处理的制桨工艺。
2.The orthogonal experiment determines the reaction ratio of calcium carbonate 、citric acid and malice acid to be 8?2?5,the reaction temperature 50℃, the calcium carbonate is added into the solution of citric acid and malice acid, reaction water amount is twice of the sum of raw materials. In this method, the calcium content of the production is moderate, and the solubility is relatively high.
用正交实验确定了合成果酸钙的投料摩尔比为碳酸钙?柠檬酸?苹果酸=8?2?5,反应温度为50℃,投料顺序为将碳酸钙粉加入到柠檬酸与苹果酸的混合溶液中,加水量为反应原料质量总和的2倍,用该方法合成的果酸钙,钙含量适中,溶解度较高。
3.The results show:when nano-calcium carbonate was applied singly it can strengthen the strength,when was applied with carbon black N330 50phr,it weaken the strengthen NBR,when nano- calcium carbonate was applied whith white carbon black 50phr,it weaken the strength too.
结果表明:纳米碳酸钙单独使用时可以补强胶料,并用50份炭黑N330后,使胶料的拉伸强度下降,并用少量炭黑时可以补强胶料,在丁腈胶中与50份白炭黑并用时也使胶料强度降低。
4.The results showed that white lime power, calcium carbonate power and dolomite power all worked well on improving brown red acidity and increasing cole yield, and the feasible applied amounts of modifiers should be 1125 ~ 1687.5 kg/hm2 of white lime power, 1500 ~ 2250 kg/hm2 of calcium carbonate power and 1500 ~ 3000 kg/hm2 of dolomite powder.
适宜的改良剂施用量为:熟石灰粉1125~1687.5kg/hm2、碳酸钙粉1500~2250kg/hm2,白云石粉1500~3000kg/hm2。
5.The mechanical properties,thermal stability,morphology and thermal oxygen aging resistance of the composites of styrene-butadiene rubber and nano-calcium carbonate modified by solid phase process (SBR/M-CaCO_3)were investigated and were compared with the composites of SBR/nano -calcium carbonate modified with stearic acid (CCR).
研究了用带有酚醛结构的反应性有机改性剂对纳米碳酸钙进行固相改性得到的M-CaCO3填充丁苯橡胶(SBR)所得复合材料的力学性能、热稳定性能、微观形态和老化性能,并与丁苯橡胶/硬脂酸包覆型纳米碳酸钙(CCR)复合材料的性能进行比较。
6.The preparation of high quality printing-ink filler 206 #—ultrafine calcium carbonate is briefly introduced. The key to the preparation of ultrafine calcium carbonate(average particle size≤0.02 μm)is to add a certain amount chelating and dispersion agents(water soluble metallic salt)in the process of carbonation reaction and to control the carbonation temperature.
对超微细碳酸钙—高档油墨填料206＃ 的研制开发做了简介，超微细碳酸钙（平均粒径≤0．02 μm ）制造的技术关键是在碳化反应过程中添加一定量的螯合剂和分散剂（水溶性金属盐）及控制碳化反应温度。
7.Syntheses and Its Properties of Nanometer Calcium Carbonate/Poly (L-lactide) Composites and Calcium Carbonate Whisker/Poly (L-lactide) Composites
纳米碳酸钙/聚-L乳酸、晶须碳酸钙/聚-L乳酸复合材料的合成与实验研究
8.The Effect of Adding Egg-shell Calcium and Calcium Carbonate to Low Calcium Diet on Calcium Balance and Apparant Density of Femurs of Rats
低钙膳中添加卵壳钙和碳酸钙对大鼠钙平衡和股骨表观密度的影响
9.It was concluded that calcium- rich ham sausage was superior to calcium carbonate in calcium biological utilization ratio.
说明高钙火腿肠生物学利用率优于活性钙制剂(CaCO_3),是一种优质钙强化产品。
10.Impregnation with calcium or calcium salts, as with calcium carbonate.
钙化掺入钙或钙盐，如用碳酸钙
