The invention discloses a method for co-producing ammonia sulfate and calcium carbonate by ardealite. The method comprises that: the ardealite serous liquid is taken and added into a reaction kettle; a stirrer is started, and the reaction kettle is heated up to the temperature of between 30 and 60 DEG C; an additive and (NH4)2CO3 are added into the reaction kettle, the …
Study on process for producing ammonium sulfate from phosphogypsum and its byproduct calcium carbonate Author(s): ZHANG Tian-yi, HU Hong, HU Bing-bing, XIE Tian, Wengfu Group Co., Ltd., National Key Laboratory of Efficient Utilization of Low Grade Phosphate Rocks and Its Associated Resources
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio OH−/Ca2+ on the Conversion Process March 2022 Waste and ...
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio OH−/Ca2+ on the Conversion Process March 2022 Waste and ...
In enhanced phosphogypsum carbonation, water is used as a solvent for dissolving the ammonia, producing the ammonium sulfate, and dissociating …
The invention relates to a method for producing ammonium sulfate and calcium carbonate from phosphogypsum, which is characterized by comprising the following steps: -dispersing phosphogypsum in water to form a phosphogypsum liquid suspension, -bubbling gaseous carbon dioxide and gaseous ammonia in the phosphogypsum liquid suspension to …
The present invention relates to a process for producing sodium sulphate from phosphogypsum, comprising: a step (101) of lixiviation of phosphogypsum by means of a basic solution so as to obtain a sodium sulphate solution (S) containing metal impurities, said basic solution comprising a chelating agent suitable for forming complexes with at least one part of …
A method for purifying phosphogypsum from impurities of phosphoric anhydride and fluorine, including mixing it with ammonium sulfate, heating the mixture and filtering the resulting suspension, so that in order to increase the degree of purification from phosphoric anhydride and simplify the process Ca, ammonium sulfate is introduced as a ...
Abstract. The Egyptian phosphogypsum waste is treated using sulfuric acid prior the ammonium sulfate production. The relevant factors that would affect the removal efficiencies of some impurities are studied. The optimum conditions of the treatment are 8 M …
The invention discloses a method for preparing light calcium carbonate and co-producing ammonium sulfate from phosphogypsum, which comprises the steps of: firstly, converting phosphogypsum into a soluble calcium ion solution through phase transfer reaction; secondly, adding a carburizer in the soluble calcium ion solution, settling and separating to obtain …
Binnemans et al., 2015). The process discussed in this article would provide a feasible alternative to reduce the amount of stockpiled PG. A well-known and extensively used production process (Vis, 1915; Witte and Wit, 1972) for ammonium sulfate [(NH. 4) 2. SO. 4, AS] utilizes calcium sulfate as a raw material (Eq. 1): CaSO 2H Os NH aq CO aq NH ...
The document describes a study on producing ammonium sulfate fertilizer from phosphogypsum waste. The Merseberg process is used, which involves reacting phosphogypsum with ammonium carbonate to produce ammonium sulfate and calcium carbonate. Experiments were conducted to determine optimum reaction conditions, finding …
stoichiometry reached. The mass fraction of ammonium sulfate in the filtrate from phosphogypsum conversion is 30.17% at 5 minutes and stoichiometry, and 30.17% at 30 minutes and stoichiometry and it was 41.53%. It was found that the mass concentration of ammonium sulfate in the obtained filtrate is higher in
the traditional evaporation of the process solution. Keywords: ammonium sulfate, ccUs, mineral carbonation, phosphogypsum, precipitated calcium carbonate, rare earth metals, reverse …
Method by Producing Potassium Sulfate From Phosphogypsum disclosed in this invention, extracting sulfuric acid ammonium salt solution adopt solid ammonium bicarbonate for Raw material, ardealite is not necessary to process and just can directly use, and technological process is simple, and the purchasing of raw materials is convenient with storing, K 2 O …
The invention discloses a method using phosphogypsum as the raw material to produce ammonium sulfate, and the method comprises steps as follows: 1750 shares of crude phosphogypsum which contains 20 percent of free water is taken, and 2 to 5 percent of the amount of the crude phosphogypsum of activator is added the aging for 2 to 8 days; then, a …
Phosphogypsum is the byproduct discharged from phosphate industry. A novel process was proposed for converting phosphogypsum into ammonium sulfate via …
The present invention relates to a process for the production of sodium sulfate from phosphogypsum comprising: a step (101) of phosphogypsum leaching by means of a basic solution to obtain a sodium sulfate solution (s). ) containing metal impurities, said basic solution comprising a chelating agent suitable for complexing with at least a portion of said metal …
In the study on the production of ammonium sulfate from phosphogypsum due to the extreme fluctuation in ammonia prices with the Covid - 19 pandemic, it was reported that the cost of producing ammonium sulfate from phosphogypsum would be more costly than the producer's production of ammonium sulfate without using phosphogypsum as a raw material[19].
PROCESS TWO Phosphogypsum Recycling Process. We reprocess noxious phosphogypsum waste—recovering sulfur for reuse and producing valuable J-Rox™. ... Reduction in straight grate furnace arrow_right_alt OUTPUTS Sulfur products (for sulfuric acid or ammonium sulfate) J-Rox™ ...
Through orthogonal test,supplementary single factor test and model test,it studies each influencing factor during the compound decomposition reaction of producing ammonium sulfate with by product phosphogypsum from the wet process phosphoric acid production and defines the favorable process conditions:reaction temperature is 60 to 70?℃,intermittent reaction …
ammonium sulfate is manufactured from gypsum by a continuous process in which an aqueous flow of material is continously recycled along a predetermined closed circuit defined by a conduit and a wider vallel connected in series. a fresh aqueous gypsum slurry comprising a dispersion of finely divided gypsum in an ammonium sulfate solution is continuously introduced into the …
The research progress of comprehensive utilization of phosphogypsum is introduced, including the production of sulfuric acid, calcium sulfate whiskers, potassium sulfate, ammonium sulfate, paper filler and coating pigment, building materials and products, nano-hydroxyapatite, as soil amendments, fertilizer, subgrade material, filling material ...
The invention discloses a method for producing calcium fluoride and white carbon black and ammonium sulfate as byproducts by using phosphogypsum as a phosphoric acid byproduct and fluosilicic acid, which specifically comprises the following steps: (a) pretreatment: reacting the phosphogypsum with 5-30% dilute sulfuric acid, and washing to obtain pure calcium sulfate; …
Systems and methods to treat flue gas desulfurization waste to produce ammonium sulfate and calcium carbonate products EP3898518A4 (en) * : : Elixsys Inc. Systems and methods to treat flue gas desulfurization and metal-bearing waste streams to recover value-added materials ... Phosphogypsum treatment process …
Phosphogypsum Farhod Ibatov1, Abdurasul Mamataliev1, ... And PG in the AN melt undergoes conversion with the formation of soluble ammonium sulfate. When obtaining samples of NPS fertilizers, the mass ratio of AN:PR varied from 100:3 to 100:50. ... Previously [2, 3], we studied the process of producing complex NPK fertilizers by adding phosphate ...
The invention relates to a method of processing phosphogypsum – phosphate production residues to ammonium sulfate ((NH)SO) used in chemical industry, e.g. in manufacturing fertilizers, and to calcium carbonate (CaCO). A method of processing phosphogypsum to ammonium sulfate and calcium carbonate comprises interaction of phosphogypsum with …
In this process, the attack of 2 tons of PR with sulfuric acid (H 2 SO 4) produces about 1 ton of phosphoric acid (H 3 PO 4) and 5 tons of calcium sulfate dihydrate (CaSO 4 …
The invention discloses a method using phosphogypsum as the raw material to produce ammonium sulfate, and the method comprises steps as follows: 1750 shares of crude phospho gypsum which contains 20 percent of free water is taken, and 2 to 5 percent of the amount of the crude phospho gypsum of activator is added the aging for 2 to 8 days; then, a reaction tank …
The production of ammonium sulfate fert ilizer from phosphogypsum is studied. The phosphogypsum is considered by prod uct from extraction process of sulphoric acid. The …
In this process, the attack of 2 tons of PR with sulfuric acid (H 2 SO 4) produces about 1 ton of phosphoric acid (H 3 PO 4) and 5 tons of calcium sulfate dihydrate (CaSO 4 ·2H 2 O) known as phosphogypsum waste (PG) [].Annually, the current production of PG worldwide is more than 250 million tons [].In Morocco, it exceeds 25 million tons per year [].The storage …
Modern age phosphorus ammonium industry and secondary calcium phosphate industry development, caused a large amount of phosphogypsum waste materials to pile up, and the major ingredient of phosphogypsum is sulphur and calcium, and needed element sulphur can be provided for the production of vilate of tartar.In order to reduce the …
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio OH−/Ca2+ on the …
A technology of phosphogypsum and ammonium sulfate, applied in ammonium salt fertilizers, chemical instruments and methods, nitrogen fertilizers, etc., can solve the problem that the production process of ammonium sulfate and its potassium calcium and silicon fertilizers has not been reported, and by-product calcium carbonate has not been detailed and economical.
The invention discloses a method for preparing calcium sulfate whisker and co-producing ammonium sulfate by phosphogypsum cyclic decomposition, which specifically comprises the following steps: (a) Phosphogypsum is subjected to sulfuric acid reaction to remove impurities, then water is added to carry out slurry mixing, the phosphogypsum enters a phase inversion …
Phosphogypsum (PG) is an acidic by-product residue from the attack of phosphate mining by the sulfuric acid in order to produce the phosphoric acid.
A well-known and extensively used production process (Vis, 1915; Witte and Wit, 1972) for ammonium sulfate [(NH. 4) 2. SO. 4, AS] utilizes calcium sulfate as a raw material (Eq. 1): CaSO 2H Os NH ...