巧修农机十法

紫铜油管材质较硬，不便弯曲安装。可将需要弯曲的部位用炭火烧红，立即放到水中冷却，就会变得柔软易弯了。

Removal of phosphate from municipal sewage by high gradient magnetic separation

The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate, Fe3O4, magnetic field intensity, pH value and flow-rate of sewage on phosphorus removal rate were investigated. The results show that addition of 200 mg/L Al2（SO4）3·18H2O and 300 mg/L Fe3O4, magnetic field intensity of 200 kA/m, pH value of 4.57.0 and flow-rate of 6.15 cm/s are both efficient and economic technical parameters for removal of phosphate. The pH value has a tremendous effect on the removal of phosphate. In the pH range of （4.5）7.0, more than 95% phosphate can be removed. Theoretical analysis indicates that the solubility of AlPO4 is minimum at pH 4.07.0 and the electrostatic attractive force between AlPO4 and Fe3O4 is maximum at pH 4.5（6.5.）

强化木地板的保养

在家装中，美观、耐磨、易保养、价位适中是强化复合木地板广受青睐的主要原因。但是，大多数消费者对如何使用和保养木地板却知之甚少。由于操作不当，强化复合木地板破损或使用寿命缩短的现象时有发生。