A kind of calcium carbide slag/lime-flue gas brine purification process

Abstract

The invention relates to a brine purification technique by a carbide slag / lime-flue gas process, which comprises the following steps: in a brine production process, mixing carbide slag or a carbide slag / lime mixture with water, mixing with injected fresh water, and pumping into a brine communication well dissolution cavity together, wherein in the brine well dissolution cavity, the carbide slag or carbide slag / lime mixture can perform primary purification reaction with soluble impurities; and pumping the brine subjected to primary purification reaction into a secondary reaction barrel, and introducing flue gas to complete the secondary purification reaction. On one hand, the technique lowers the production operation cost, greatly saves the reaction time, and enhances the brine supply quantity; and on the other hand, the technique reduces the primary purification system on the ground surface, saves abundant equipment and maintenance administration cost, reduces the ground labor work load and lowers the manpower cost.

Description

technical field [0001] The invention relates to the field of brine purification, in particular to a carbide slag / lime-flue gas brine purification process. Background technique [0002] The purpose of brine purification is to remove impurities in raw brine and obtain qualified refined brine. The lime-flue gas method is a commonly used method in brine purification. The process principle is as follows: the first step is to add lime to the brine to generate OH - Remove Mg from brine 2+ and used in the second step; in the second step, the flue gas is passed into the clarified liquid after the first step, and the CO in the flue gas is used 2 and OH - The reaction produces Na 2 CO 3 , then with Ca 2+ The reaction produces CaCO 3 Precipitation to remove Ca 2+ the goal of. Among them, the role of lime is to generate enough OH in the brine - However, a large amount of lime needs to be added in production, and the generated mud needs to be returned to the well, which requires...

AI Technical Summary

Problems solved by technology

[0003] In addition, in the existing brine purification process, the first-level purification reaction is carried out on the surface. On the one hand, it is necessary to equip the first-level purification reaction equipment, which not only increases the equipment purchase cost, operation cost and maintenance management cost, but also increases manual work. On the other hand, the mud produced after the primary purification reaction and the secondary purification reaction needs to be pumped into the abandoned well through the mud tank, which not only increases the amount of mud returned to the well, but also increases the mud discharge pressure