STUDY OF THE SEPARATION PROCESS OF THE DOLOMITE SOIL FORMED DURING THE DISSOLVING OF DOLOMITE WITH SULFURIC ACID INTO LIQUID AND SOLID PHASES

Аннотация

The foam height and foam density formed during the decomposition of local dolomite raw materials in the presence of sulfuric acid under optimal conditions were determined, and methods and optimal conditions for reducing foam density were studied using “PAA-gel” and “StructolSB-2195”as antifoaming reagents. Keywords:Foam density, PAA–gel, Structol SB-2195, blueribbon-TU, SFM. In order toaccelerate the process of sulfuric acid decomposition of local dolomite raw materials and establish optimal conditions and technological parameters for its processing into liquid and crystalline MgSO , (NH ) Mg(SO ) , (NH ) Mg(SO ) ·6H O and liquid and granular nitrogen 4 4 2 4 2 4 2 4 2 2 calcium and magnesium fertilizers, as well as to carry out scientific research in laboratory conditions, dolomite raw materials were imported from Dehqanabad district, Kashkadarya region. The filtration rate of the sour slurry obtained from the decomposition of the selected dolomite sample with sulfuric acid with a concentration of 20 to 40%, standard 110%, was determined by slurry, liquid and solid phases, and theresults obtained are presented in this table [1]. The effects of surfactants (PAA - gel and Structol SB-2195) and acid concentrations on the filtration rate of the slurry formed by the processing of dolomite raw materials with sulfuric acid at acid concentrations of 20, 30 and 40%, standard 110%, solid:liquid phase ratios of 1:3.5, 1:2.8, 1:2.3, 1:2.0 and 1:1.8 and a temperature of 50 °C were determined. Technological parameters for the filtration of sour slurry obtained from the processing of dolomite with sulfuric acid, at a temperature of 50 °C and a pressure of 0.06 MPa or 450 mm.cm.st., the effects of 10, 20 and 30 g/ton of PAA - gel and Struktol SB-2195 surfactants on the filtration process on filter paper of the blue ribbon-TU 2642-001-05015242-07 brand were determined. In this case, it was determined that the filtration rate of the slurry obtained by disintegrating the dolomite raw material with sulfuric acid with a concentration of 20% was 2025.50 kg/m2·s for the slurry without surfactants, 1418.30 kg/m2·s for the filtrate (sour liquid phase), 607.20 kg/m2·s for the solid phase and 162.80 kg/m²·s for the sum of the amounts of CaO+MgO. When we added PAA-gel and Structol SB-2195 surfactants in the amount of 10-30 g/t to the process of dolomite decomposition in 20% H SO (10 SFM added to 1 ton of dolomite raw 2 4 material), the filtration rate of the slurry increased from 3066.40 to 3355.40 kg/m³·s and 3152.50 to 3194.00 kg/m²·s for the slurry, from 2330.55 to 2550.20 kg/m²·s and 2404.80 to 2434.90 kg/m²·s for the filtrate (sour liquid phase), from 735.85 to 805.20 kg/m²·s and 747.70 to 797.35 kg/m²·s for the solid phase. and the sum of CaO+MgO increased from 246.65 to 269.70 kg/m²·s and from 253.40 to256.70 kg/m²·s, respectively. The filtration rateof the slurry, which was decomposed with 30% sulfuric acid, was 2184.00 kg/m2·s for the slurry without 276 INTERNATIONAL MULTIDISCIPLINARY JOURNAL FOR RESEARCH & DEVELOPMENT SJIF2019:5.2222020:5.5522021:5.6372022:5.4792023:6.5632024:7,805 eISSN:2394-6334 https://www.ijmrd.in/index.php/imjrd Volume12,issue08(2025) surfactants, 1386.65 kg/m²·s for the filtrate (sour liquid phase), 797.35 kg/m²·s for the solid phase, and 222.20kg/m²·sfor thesum ofCaO+MgO. Table1. The effect of surfactants on the filtration rate of slurry obtained from the decomposition of dolomitewith sulfuricacid (N=110%; t=50 °С and τ=40 min) Porridge filtration rate, kg/m2·s Const. (0,06MPа) Surfactant, H SO Fil‘trat (nordon 2 4 gr/ton Bo‘tqa Qattiq faza CaO+MgO % suyuq faza) bo‘yicha bo‘yicha bo‘yicha bo‘yicha 0 2025,50 1418,30 607,20 162,80 PAA-gel 10 3066,40 2330,55 735,85 246,50 20 3210,90 2440,38 770,52 258,10 20 30 3355,40 2550,20 805,20 269,70 “StruktolSB2195” 10 3152,50 2404,80 747,70 253,40 20 3173,25 2419,85 753,40 255,05 30 3194,00 2434,90 759,10 256,70 0 2184,00 1386,65 797,35 222,20 PAA-gel 10 2712,00 1672,17 1039,83 276,89 20 3229,30 1917,72 1311,58 332,71 30 30 3746,60 2163,27 1583,33 388,52 “StruktolSB2195” 10 2861,96 1806,83 1055,13 292,15 20 2936,11 1844,34 1091,77 299,75 30 3010,25 1881,84 1128,41 307,34 0 2342,50 1355,00 987,50 327,95 PAA-gel 10 2357,60 1013,80 1343,80 330,06 20 3328,40 1452,73 1875,67 465,97 40 30 4299,20 1891,65 2407,55 601,88 “StruktolSB2195” 10 2571,43 1208,87 1362,56 360,00 20 2698,97 1268,83 1430,14 377,85 30 2826,51 1328,78 1497,73 395,70 When we added PAA-gel and Structol SB-2195 surfactants in the process of dolomite decomposition at 30% H SO in an amount of 10 - 30 g/t (10 SFM added to 1 ton of dolomite 2 4 raw material), the filtration rate of the slurry increased from 2712.00 to 3746.60 kg/m³·s and 2861.96 to 3010.25 kg/m²·s for the slurry, from 1672.17 to 2163.27 kg/m²·s and 1806.83 to 1881.84 kg/m²·s for the filtrate (sour liquid phase), from 1039.83 to 1583.33 kg/m²·s and 277 INTERNATIONAL MULTIDISCIPLINARY JOURNAL FOR RESEARCH & DEVELOPMENT SJIF2019:5.2222020:5.