| 摘要 |
<p>Method is for purifying substances in colloidal form, partic. complete metals such as jellies or colloids of aluminium phosphate or hydroxide iron hydroxy-oxide and chromium hydroxy-oxide and calcium hydroxide and similar materials. - Method comprises passing the raw suspension at high speed and low pressure through filter elements with controlled pores. This gives a selective path in crossing as a function of the size of the molecules and particles present in the soln.</p> |
