STUDY OF THE PURIFYING FLOTATION POTASSIUM CHLORIDE PROCESS FROM AMINES USING ULTRASONIC TREATMENT

In the technology of flotation enrichment of sylvinite ore, aliphatic amines are widely used, which are effective collecting reagents that provide high KCl recovery. Amines typically contain 16 to 22 carbon atoms in the aliphatic chain, making them virtually insoluble in water. By adsorbing on the surface of sylvite, amines create a hydrophobic surface, ensuring the floating of potassium chloride particles and their separation from halite. The presence of a hydrophobic amine film on the surface of the KCl flotation concentrate significantly impairs the efficiency of its pressing and contributes to a decrease in the quality of the finished product. The presented work presents studies on the purification of the crystalline surface of flotation potassium chloride from aliphatic amines using ultrasonic treatment, as well as an assessment of the strength of granular potassium chloride obtained from flotation crystallisate subjected to ultrasonic treatment. It has been shown that with an increase in the intensity of ultrasonic treatment of a suspension of flotation potassium chloride from 20 to 50 W/cm2, the mass fraction of aliphatic amines in the samples decreases, regardless of the duration of treatment. With an ultrasonic irradiation intensity of 40 W/cm2 for 60 s, it is possible to maximally reduce the concentration of amines in the finished crystalline product from 130 to 32 g/t. It has been established that with increasing pressure and pressing time of flotation potassium chloride, an extreme change in the average static strength of the resulting granules occurs. Thus, when the pressing pressure changes in the range from 3 to 15 MPa with a constant holding time of 30 s, the static strength of the granules reaches its maximum value at 10 MPa. Research on the influence of the effectiveness of parameters of ultrasonic cleaning of potassium chloride flotation concentrate from aliphatic amines on the process of pressing crystalline particles showed that 60 s cleaning at an ultrasound intensity of 40 W/cm2 made it possible to achieve maximum static strength of granules σ = 210.2 N/granule and hardening coefficient K = 1.36. The results of the presented studies can be used in the design of technology for pressing flotation potassium chloride at potash concentration plants. For citation: Podtynova A.S., Cherepanovа M.V., Lanovetskiy S.V. Study of the purifying flotation potassium chloride process from amines using ultrasonic treatment. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 3. P. 86-94. DOI: 10.6060/ivkkt.20256803.7106.