METHOD OF CONTROLLING POTASSIUM CHLORIDE PRODUCTION PROCESS Russian patent published in 2011 - IPC C01D3/08 G05D27/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in halurgic production. The method of controlling the process of producing potassium chloride involves control of input streams, distribution of a weak salt solution, determination of temperature of a hot saturated solution and concentration of salts in said solution. Further, density of the hot saturated alkali is measured. The density value is used to calculate content of magnesium chloride in the alkali. The amount of water required for setting the content of magnesium chloride to the control value and compensating for excess mother alkali is determined. The calculated value is used as a setting in the system for controlling consumption of water and excess mother alkali is taken out of the process:

where is content of magnesium chloride in the hot saturated alkali, %; ρ is density of alkali, t/m³; A=-a₀t²+a₁t-a₂; B=-b₀t²+ b₁t-b₂; C=-c₀t²+c₁t-c₂; where A, B, C, a₀, a₁, a₂, b₀, b₁, b₂, c₀, c₁, c₂ are coefficients; t is temperature of the alkali, °C; where is water consumption, t; G_A is the control value of alkali consumption, t; is the control value of content of magnesium chloride in the hot saturated alkali, %.

EFFECT: invention increases accuracy of controlling the process of dissolving an electrolyte used to produce potassium chloride and synthetic carnallite produced during electrolysis in the production of magnesium metal.

2 cl, 2 ex