Abstract: Rhenium is a strategic metal, which plays an important role in military, aerospace and aviation fields. It has become an indispensable material in aerospace engines due to its unique properties. Rhenium metal has almost no independent deposits, and its resources are mainly associated with copper, molybdenum and other metal ores. Rhenium resources in copper ore are enriched into waste sewage acid after copper smelting process, making copper sewage acid an important rhenium-containing resource, rhenium volatilizes into the furnace gas in the form of rhenium octoxide during the high temperature smelting process of copper concentrate, and after dust collection, rhenium enters the acid making system with sulfur dioxide, and the rhenium-containing flue gas is enriched in the form of perrhenate after rinsing and purification Copper acid in acid. The recovery of rhenium from copper acid has become an important research content of rhenium metallurgy. This paper reviews the technical difficulties of rhenium extraction from dirty acid, mainly including: (1) the content of main metal elements is too low, and the content of rhenium in dirty acid is only 5~40mg·L-1; (2) The acidity of the dirty acid system is high, and the sulfuric acid content can reach 50~150g·L-1; (3) There are many types of impurity elements in the dirty acid system, including copper, arsenic, lead, zinc, molybdenum and other heavy metals, of which the arsenic content is about 8~15g·L-1; (4) The amount of dirty acid produced is large, the daily processing capacity of rhenium extraction is high, taking a domestic copper smelter as an example, the daily production of dirty acid 1000m3, so it is required that the daily processing amount of rhenium extraction technology cannot be less than the daily output of dirty acid, to avoid the storage of a large amount of liquid, resulting in an increase in the cost of enterprises.