The modern salt lake potassium deposits have more exposed surface, and the solid potassium salt ore bodies are buried shallowly, mostly using artificial mining and a few mechanized mining. The potassium salt mining method is similar to the stone salt mining method. Inner Mongolia Jilantai Salt Field and Qinghai Chaka Salt Field have achieved mechanized mining, and the output of each class can reach 80-250t. The salt lake brine mining method is relatively simple: the brine is pumped into the salt field, and the sun is used to evaporate the beach, and the sodium chloride is concentrated to remove the potassium salt. The product can also be extracted directly from the brine. This method is used to extract potassium-containing intercrystalline brine in Chaerhan Salt Lake, Qinghai. The mining area of ​​Chaerhan Salt Lake, the preferred location on the east bank of Lake Dabson, is 8km wide from east to west, 12km long from north to south, and covers an area of ​​96km 2 . According to the change and dynamic law of intercrystalline brine, shallow brine is extracted by channel method. The brine extraction channel is excavated in the rock salt layer, and the channel has two north-south directions with a spacing of 3km, which is collected at the water intake point A. At the water intake point, a solid ship pumping station is set up. From the southern end of the brine extraction channel, the brine pump is pumped into the salt field to enter the brine point B and then poured into the sodium salt pool. The continuous water walking mode is adopted in the beach, and the specific gravity of the brine in the pool is adjusted to about 1.28. At the same time, the intergranular brine is continuously discharged into the two hawstone pools of the east and the west, and the ore brine is produced by steaming in the salt field. The main technical and economic indicators for brine extraction in Chaerhan Salt Lake are shown in the table below.
Main technical and economic indicators for brine extraction in Chaerhan Salt Lake 
It can be seen from the old halogen emissions in the table that the salt lake is discharged into the South Hobson Lake with 10 million tons of old halogen every year. It will inevitably cause pollution of the entire lake area. It is necessary to solve the problem of comprehensive utilization of old halogens while strengthening environmental protection.
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