METHOD OF PROCESSING DISTILLERY SUSPENSION OF AMMONIUM-SODA MANUFACTURE Russian patent published in 1997 - IPC

FIELD: chemical technology. SUBSTANCE: method of soda production solid waste from chlorides involves mixing distillery suspension slime with industrial waste containing the dissolved carbonates up to preparing mixture at ratio Ca²⁺:CO2-3

= 1:(1.4-1.6), washing and drying deposit. Distillery suspension is carbonized with carbon dioxide up to pH = 6.9-7.0 and polyacrylamide is added to suspension at amount (3-7) x 10^-4 g/1 g solid phase. Deposit isolated from suspension is washed off for two stages at the separate filtrate removing after each washing off stage. At the first stage of washing off the filtered off slime is washed off with the second washing filtrate obtained at the preceding filtration cycle; then at the second stage it is washed off with water and the obtained washing filtrate is used in the following filtration cycle at the first stage of slime washing off. Method is used for treatment of the mineralized suspensions containing water-soluble compounds of alkaline-earth metals. EFFECT: improved method of processing. 4 cl, 1 tbl