森林

森林青枝众所周知，森林是人类生产和生活所需木材的来源。不仅如此，木材经过化学加工，可以制造出葡萄糖、酒精、饲料酵母、糠醛、甲醇、松香等多种产品，从这个意义上讲，森林是丰富的原料宝库。木材重量的５０％是纤维素，纤维素属于高聚糖，其基本结构是葡萄糖。工业...

生产石膏的SO2洗涤器

一种第二代的烟气洗涤技术是由西德Saarberwerke公司和Hoelter公司的一组文丘里试验发展起来的。1978年1月,美国Davy动力用气公司获得了该技术的北美专利许可权。

二氧化硫使石灰水变浊的实验

二氧化硫与氢氧化钙反应,生成亚硫酸钙和水 SO2+Ca（OH）2=CaSO3↓+H2O因亚硫酸钙不溶于水,所以从理论上讲应出现溶液浑浊现象。但是用实验做出这一现象,却是十分困难的,是中学化学实验中的难点。现介绍用简易方法做出这一实验。 第一步 制取二氧化硫。用18毫米×200毫米的具支试管带单孔塞配一分液漏斗,支管接导气管,装入亚硫酸钠和硫酸,如图1所示。或用图2所示装置,试管内加入铜片和浓硫酸。

Recovery of magnetite from FeSO_4·7H_2O waste slag by co-precipitation method with calcium hydroxide as precipitant

Proper utilization of the FeSO4·7H2O waste slag generated from TiO2 industry is an urgent need, and Fe3O4 particles are currently being widely used in the wastewater flocculation field. In this work, magnetite was recovered from ferrous sulphate by a novel co-precipitation method with calcium hydroxide as the precipitant. Under optimum conditions, the obtained spherical magnetite particles are well crystallized with a Fe304 purity of 88.78%, but apt to aggregate with a median particle size of 1.83 μm. Magnetic measurement reveals the obtained Fe304 particles are soft magnetic with a saturation magnetization of 81.73 A-m2/kg. In addition, a highly crystallized gypsum co-product is obtained in blocky or irregular shape. Predictably, this study would provide additional opportunities for future application of low-cost Fe3O4 particles in water treatment field.

造纸黑液的资源化处理——喷雾干燥法

植物茎杆的主要成分是纤维素、半纤维素和木质素,纤维素约占50%,半纤维素占15%～25%,木质素占15～30%。