RESEARCH ON THE ELIMINATION OF FOAMING IN THE PROCESS OF EXTRACTION OF PHOSPHORIC ACID FROM HIGH-CARBONATE PHOSPHORITE RAW MATERIALS

Аннотация

Изучен процесс разложения серной кислотой высококарбонатного фосфоритного сырья месторождения Ташкура и получения экстракционной фосфорной кислоты, кратность пены образующейся в ней фосфорнокислотной пульпы и способы ее устранения. Определены высота и кратность пены, образующейся при разложении высококарбонатного фосфоритного сырья в присутствии фосфорной и серной кислот в оптимальных условиях, а также исследованы методы и оптимальные условия снижения кратности пены в присутствии "ПАА-гель" и "Структол СБ-2195" в качестве пеногасителей. Ключевые слова:Высококарбонатное фосфоритовое сырье месторождения Ташкура, фосфорнокислый пульпы, пенообразователь, ПАА-гель, «Structol SB-2195» ЭФК, разложения. Literature review. "Kyzilkum Phosphorite Complex" LLC of Central Kyzylkum (MK) in Navoi region produces 3 types: washed-burnt phosphorite (YuKFK), washed-dried phosphorite (YuQF) and high-carbonate phosphorite raw materials (YuKFX). In our republic, only "Ammofos-Maxam" JSC produces EFC from YuKFK by the dihydrate method [1, 2]. "Kyzilkum Phosphorite Complex" LLC has an annual production capacity of 716,000 tons (~ 26.2%P O ), but produces 450,000tons ofUFK per year onaverage. [3,4]. 2 5 The foaming produced in the processes of obtaining double superphosphate, monodicalcium phosphate, precipitate [5, 6] by decomposing BFX in the presence of different standards of EFK, phosphorsulfurcalcium RS-agro and enriched superphosphate SPF-26, SPF-23 [7, 8] in the presence of sulfuric and phosphoric acids, nitrophos fertilizers [9] by decomposing them in the presence of nitric acid, and various technological and technical methods. studies have been conducted on elimination using However, chemical reagents were not used in the research to reduce foaming during thedecomposition of BFX with mineral acids. Research methods. In carrying out research work, MQ YuKFX (OzDSt 2825:2018, produced at "Kyzilkum Phosphorite Kombinati" LLC), EFK (TSh 6.6-21:2018, produced at "Ammofos-Maxam" JSC) and sulfuric acid (GOST 2184-2013) and PAA-gel (Ts 00203849-64- 2016, produced at "Navoiyazot" JSC) and "Struktol SB-2195" (Struktol SB-2195, Schell+Seilacher GmbH, Germany) reagentswere used. Discussion and results: The chemical composition of YuKFX used in research works is as follows, heavy. %: Р О -21.8; CaO - 49.8; MgO - 1.20; Al О - 0.31; Fe О - 0.65; СО - 2 5 2 3 2 3 2 12.10; Cl- - 0.24; СаО/Р О - 2.285; insoluble residue - 4.5; H O - 1.2; organic carbons - 2.0 2 5 2 was determined onthebasis ofchemical and physico-chemical analysis. In the research work carried out in the experimental device, the effects of the duration of the process and the amount of "PAA-gel" and "Struktol SB-2195" substances on the foaming process (foam height, foam density (Kk), foam "living" period) during phosphate and sulfuric acid decomposition of YuKFX from the Tashkura mine were studied. The formed Kk and the period of existence - "living" time were taken as the factors characterizing the foaming process. page501 INTERNATIONAL JOURNAL OF ARTIFICIAL INTELLIGENCE ISSN:2692-5206,ImpactFactor:12,23 AmericanAcademicpublishers,volume05,issue02,2025 Journal: https://www.academicpublishers.org/journals/index.php/ijai The height of the foam was measured according to the values ​ ​ ​ ​ specified in the dimensions, and the "living" time of the foam was measured with a stopwatch. Kk was defined as theratio offoam volumeVkto theliquid volumeVs used forits formation [10, 11]. Kk =Vk /Vs = Vg +Vs /Vs,where Vg is thegas volumein thefoam. The "living" time (U) of the foam is determined by the amount of liquid released at time t(sec) or therate ofliquidrelease from thefoam, i.e. U =Vs / t [12]. The extraction process of EFK was carried out at H2SO4 rate - 104%, Q:S = 1:3.0, decomposition process temperature - 80 ℃ and duration - 90 minutes. In this case, the extraction process of EFK was carried out in two stages. In the first stage, the foam height and Kk were determined in the 12% EFK circulation solution for 20 minutes, and inthe 93% sulfuric acid digestion process for 90 minutes. At the initial stage, YuKFX was added to a circulating solution of 12% P O EFK and 93% H SO to the obtained slurry at the same rate for 10 minutes, 2 5 2 4 andtheheight offoam andprecipitatewas measured. The effects of PAA-gel and Struktol SB 2195 substances and their concentration and quantity on the foaming process during the sulfuric acid decomposition of high-carbon phosphorite of the Tashkura mine in the experimental model device in laboratory conditions were determined. Theresults of the scientific research are presented in Figures 1, 2and 3 below. In these pictures, the effects of initial and surface passive substances ("PAA-gel" and "Struktol SB 2195") on the process of foam formation (foam height, foam density, foam residence time, etc.) during the decomposition of YuKFX from the "Tashkura" mine with 93% H SO in an 2 4 experimental model device in laboratory conditions were studied. In this cas