Method and device for absorbing waste chlorine generated in lithium production process by utilizing iron powder

[0021] like figure 1 As shown, the present invention provides a method for utilizing iron powder to absorb waste chlorine gas produced in the lithium production process and a device thereof, wherein the method for utilizing iron powder to absorb waste chlorine gas produced in the lithium production process includes the following steps:

[0022] 1) For the collection of waste chlorine gas, in a fully sealed electrolytic cell, a collector is connected to the upper end of the anode of the electrolytic cell, and the negative pressure is 1*10 -2 Lead the waste chlorine gas out of the tank;

[0023] 2) cooling the waste chlorine gas to 15°, condensing and separating part of the water therein;

[0024] 3) using concentrated sulfuric acid to further dry the cooled chlorine;

[0025] 4) Feed the waste chlorine gas into the chlorination furnace and react with iron powder to generate gaseous ferric chloride;

[0026] 5) cooling the gaseous ferric chloride to obtain ferric chloride crystals.

[0027] The device that uses iron powder to absorb waste chlorine gas generated in the lithium production process includes: chlorine gas collector 1, heat exchanger 2, gas-liquid separator 3, absorption tower 4, chlorine gas buffer tank 5, chlorination furnace 6, condenser 7. The conveyor belt 8 and the ferric chloride storage hopper 9, wherein the chlorine gas collector 1 is placed on the anode of the electrolytic cell, and the upper end outlet of the chlorine gas collector 1 is connected to the heat source inlet 21 of the heat exchanger 2 through a pipeline, and the heat source outlet of the heat exchanger 2 22 is connected to the gas-liquid separator 3, the air outlet of the gas-liquid separator 3 is connected to the air inlet 41 at the bottom of the absorption tower 4, the liquid inlet 43 at the top of the absorption tower 4 is connected to concentrated sulfuric acid, and the gas outlet of the absorption tower 4 is connected to the chlorine buffer tank 5 Above, the outlet of the chlorine buffer tank 5 is connected to the air inlet 61 of the chlorination furnace 6, the top of the chlorination furnace 6 is an iron powder inlet 63, the bottom of the chlorination furnace is provided with a slag outlet 64, and the upper part of the chlorination furnace 6 is provided with a chlorination furnace 6. The gas outlet of the furnace, the gas outlet of the chlorination furnace is connected to the condenser 7, the lower part of the condenser 7 is provided with a discharge port 71, the conveyor belt 8 is arranged below the discharge port 71 of the condenser 7, and the ferric chloride storage hopper 9 is arranged on the conveyor belt 8 below.

[0028] The cold source of the heat exchanger 2 is water, and the cold source of the condenser 7 is also water.

[0029] Through practice, the method and device of the present invention for utilizing iron powder to absorb waste chlorine gas produced in the production process of lithium, the recycling rate of chlorine gas is as high as 99%, which solves the environmental pollution problem of waste chlorine gas. Plants are often discarded as waste products. Among the raw materials for producing ferric chloride, the cost of chlorine gas and iron powder is very low. This not only recovers chlorine resources, but also produces higher economic benefits for ferric chloride.