再沉淀

In this ***,nano-particles of NiCuZn ferrites powders were prepared with nickel nitrate,zinc sulfate,copper sulfate and ferrous sulfate as starting materials and ammonium oxalate as the precipitator by employing co-precipitation technique using oxalate precursors.Excellent composition uniformity NiCuZn ferrite powder can be obtained after drying and calcination.Toroidal samples were obtained after being formed and sintered.

本文以硫酸镍、硫酸铜、硫酸锌、硫酸亚铁和草酸铵为原料，应用化学共沉淀法制得分布均匀的先驱粉，经烘干、煅烧制成成分均匀性极佳的NiCuZn铁氧体粉末，再经成形和烧结等工艺，最后制得环形NiCuZn铁氧体材料。

Said metal nitride is prepared through mixing the aqueous soltuion of nitrate or sulfate of A with the aqueous soltuion of Cr, Mo or W acid or one of their ammonium salts, coprecipitation or impregnation to obtain load-type or non-load-type dual-component metal salt or compound oxide, then pass in NH3, sequentially heating and azotizing at 600-750 deg.C.

该金属氮化物是由含A过渡金属元素的硝酸盐或硫酸盐水溶液与Cr、Mo或W酸或者Cr、Mo或W酸铵水溶液混合，通过共沉淀法或浸渍法制成负载型或非负载型双组元金属盐或复合氧化物，再将双组元金属盐或复合氧化物通NH3进行程序升温，至最终氮化温度600～750℃下进行反应而制得。

Then the experiments on the separation of lithium and magnesium from bitterns contenting lithium were carried out, during the experiment NaOH was chosen as addition to further remove magnesium from the extraction liquid and Na_2CO_3 was chosen as deposition agent to prepare Li_2CO_3 product.

作者选取磷酸三丁酯为萃取剂，200#溶剂汽油为稀释剂，氯化铁(FeCl_3)为共萃取剂，对盐湖含锂卤水进行萃取分离镁锂的试验，然后采用氢氧化钠对萃取液进行深度除镁，再用碳酸钠作为沉淀剂制备碳酸锂产品。

By this method, the productivity of 3. 18g/l extracellular polysaccharides was obtained. The optimum extraction method was obtained by RSA. It was determined as follows: 91. 4 ℃, 2. 9h, the weight ratio between mycelia and water was 1 to 3. The productivity was 12. 38% of dry mycelia. Set the purifying methods of Grifola frondosa: Precipitated polysaccharides part by 60% ethanol→removed protein by Sevag method→removed coloring matter by H〓O〓→removed salts by dialyse→DEAE-cellulose column chromatogram→ purified polysaccharides groups.

对于胞内多糖的提取，采用湿菌体经捣碎再高压破壁的方式破碎菌体细胞，采用响应面分析法得出优化后的提取条件为：提取温度91.4℃，提取时间2.9h，料水比1：3，此提取条件下胞内粗多糖的率为干菌体重的12.38％建立了灰树花多糖分离纯化的技术路线 60％乙醇沉淀的粗多糖→Sevag法脱蛋白→H〓O〓脱色→透析脱盐→DEAE-纤维素层析分离→多糖组分。

After flocculation the cells of Klebsiella pneumoniae in the floes grew well(OD 13.5)and were used repeatedly.

絮凝细胞再发酵实验表明：絮凝沉淀中的菌体仍然可以重复利用。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。