Method for extracting iodine from iodine-containing phosphorus ore

Abstract

The invention relates to a method for extracting iodine from iodine-containing phosphorus ore, which is characterized by comprising the following steps: (1) an oxidizing agent prepared by one of chlorine or carbon tetrachloride or hydrogen peroxide is directly added to a phosphoric acid transporting pipeline; (2) phosphoric acid enters an extracting tower by directly entering the tower; (3) extracting gas adopts a tangential gas entering mode to lead diluted acid to generate rotational flows; and (4) a bubble type sieve plate is selected to lead the extracting gas and the diluted acid to be sufficiently contacted so as to extract iodine molecules in the phosphoric acid. The method sets an operation index aiming at the characteristic of iodine in the phosphorus ore in oxidizing and extracting processes and the characteristic of impurities in the diluted acid, the iodine extracting rate of the phosphorus ore can be effectively increased by 70-80 percent by using the method and the operation index and matching with the phosphorus ore extracting tower invented by an inventor, the operation cycle of the extracting tower is effectively prolonged in order to lead the extracting tower to continuously and stably operate for 200-300 hours, and the cleaning operation of the sieve plate is reduced.

Description

technical field [0001] The invention relates to iodine, in particular to a process for extracting iodine from iodine-containing phosphate ore, and further to a method for extracting iodine in the process. Background technique [0002] Iodine often exists in a variety of mineral resources in the form of associated ore. The emergence of industrial technology for the recovery of iodine resources associated with phosphate rock has enabled the extraction and utilization of iodine in phosphate rock. [0003] Extracting iodine from phosphate rock is mainly carried out by using phosphoric acid produced from phosphate rock as a raw material. This process technology has been recorded in Chinese Patent No. 200510003058.2 "Method for Extracting Iodine from Dilute Phosphoric Acid Produced in the Production Process of Iodine-Containing Phosphorus Rock" . In the process of producing phosphoric acid from phosphate rock, iodine as an associated mineral enters phosphoric acid in the form of ...

AI Technical Summary

Problems solved by technology

However, in the extraction process of this technology, the extraction effect is poor and the start-up rate is low. The sieve plate is often blocked after only running for more than 10 hours, and the sieve plate is time-consuming and laborious to clean, which seriously affects the extraction efficiency of iodine extraction in dilute acid.