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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 …
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 ...
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; …
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 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 …
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 …
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.
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.
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 …
Phosphogypsum Two-Step Ammonia-Carbonation Resulting in Ammonium Sulfate and Calcium Carbonate Synthesis: Effect of the Molar Ratio OH−/Ca2+ on the …
The invention discloses a method for producing ammonium sulfate by using ammonium bicarbonate as a main raw material, comprising the following steps of: (1) adding solid ammonium bicarbonate, process water, liquid ammonia or gas ammonia into a dissolving tank according to a mass ratio through measurement to react to be prepared into an ammonium …
The process for manufacture of ammonium sulfate from gypsum, known as the Merseburg Process, named for the town in Germany where it was developed, has been commercially produced in plants in Austria, India, Pakistan and the United Kingdom in the past. It is based on reacting ammonia and carbon dioxide to produce ammonium carbonate, which is then …
The invention discloses a method for producing feed calcium and coproducing ammonium sulfate by using phosphogypsum, which takes the byproduct solid waste phosphogypsum of a phosphate fertilizer plant as a raw material, carries out defluorination and activation, adds a reaction auxiliary agent to react with ammonium dihydrogen phosphate, and then prepares a …
The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium.
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 …
Ammono-carbonation reac tion of any kind of gypsum (pure, P G or. FGD gypsum) with ammonium carbonate known as Merseb urg Process is used to. produce ammonium sulfate and calcium carbonate. This ...
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 conversion of calcium sulfate to calcium fluoride in acidic medium was reported using phosphogypsum as a source of CaSO 4 . The reaction was successfully achieved using reagents such as HF ...
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 ...
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
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 ...
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 …
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 …
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 enhanced phosphogypsum carbonation, water is used as a solvent for dissolving the ammonia, producing the ammonium sulfate, and dissociating …
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 …
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 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 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 …
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].