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.
US10689261B2 US16/320,285 US201716320285A US10689261B2 US 10689261 B2 US10689261 B2 US 10689261B2 US 201716320285 A US201716320285 A US 201716320285A US 10689261 B2 US10689261 B2 US 10689261B2 Authority US United States Prior art keywords sodium sulphate chelating agent filtration solution phosphogypsum Prior art date 2016-07 …
This paper proposes a very attractive process for K 2 SO 4 production via the wet conversion of phosphogypsum (PG) and K 2 CO 3. A parallel study of the conversion of two …
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 …
The process of potassium sulfate crystallization from aqueous solutions in the presence of organic modifiers containing phosphonic, phosphate, sulfonic, sulfate and carboxyl functional groups has ...
The factors affecting the conversion of potassium chloride to potassium sulfate, such as aqueous ammonia to phosphogypsum ratio, weight percent of isopropanol in the solution, weight percent excess phosphogypsum, and reaction temperature and pressure have also been investigated.The optimum reaction conditions obtained at 25°C and atmospheric ...
[20−24] Table 1 Main technology of phosphogypsum preparation of β-hemihydrate gypsum [20−24] [25,26] [31] 。 ... The aim of this process is to produce potassium sulfate, a high-value ...
The factors affecting the conversion of potassium chloride to potassium sulfate, such as aqueous ammonia to phosphogypsum ratio, weight percent of isopropanol in the solution, weight percent excess phosphogypsum, and reaction temperature and pressure have also been investigated.The optimum reaction conditions obtained at 25°C and atmospheric ...
Request PDF | Process of preparing chloride-free KNS compound fertilizers from phophogypsum waste using a quaternary phase diagram | Phosphogypsum (PG), commonly known as calcium sulfate, is a ...
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Phosphogypsum is a by-product of the wet-process phosphoric acid production, and it is rich in Ca and S. Long-term storage of Phosphogypsum can cause serious pollution to the environment; therefore, promoting the sustainable utilization of Phosphogypsum is crucial. This study proposes the use of Phosphogypsum and silicic acid in a sodium hydroxide …
A study on the new production process for potassiam sulfate from phosphogypsum Ⅱ. A new preparing process of potassium sulfate from ammonium sulfate Author(s): HUANG Yueyuan, ZHANG Fenyan, ZHAO Tiancheng, CHEN Qishi Pages: 399-402 Year: 2001 ...
A process for preparing potassium sulfate and multiple by-products uses ardalite and potassium chloride as raw materials and the ammonia-contained solution catalyst, and features the transform reaction under stirring to obtain potassium sulfate. Regulating the ammonia concentation in mother liquid and taking other measures can prepare multiple by-products.
Process of preparing potassium sulfate guided by the phase diagram. In this process, the reactions are taking place at a constant temperature (25 °C). This can be …
The present work suggests an attractive process allowing total PG conversion by potassium hydroxide KOH. This decomposition leads to potassium sulfate K 2 SO 4 and …
The process comprises four basic units: preparation of the ore and flotation, production of ite and its recovery, leaching of the ... In this production process, potassium sulfate is ...
range of application. Hitherto the preparation methods of α-HH from industrial by-product gypsum mainly include the autoclave process, salt/acid solution process, or alcohol-water solution process. Thereinto, the autoclave process is the only method to realize industrialization. In order to solve the
Phosphogypsum (PG) is a hazardous industrial solid waste product from the wet phosphate industry 1,2.The widespread deposition of that fine, light- to dark-grey, powder with a slight odor and ...
BAOGUO MA, ZIHAO JIN, YING SU, et al. Utilization of hemihydrate phosphogypsum for the preparation of porous sound absorbing material[J]. Construction and Building Materials, 2020(234):1177346. Google Scholar ... Two - step process for potassium sulfate production from phosphogypsum.
[0003] For the above-mentioned problems in the prior art, the main purpose of the present invention is to provide a kind of method for preparing calcium sulfate by phosphogypsum, after described method handles phosphogypsum, obtained the higher calcium sulfate product of purity and added value, solved The practical problem that phosphogypsum cannot be …
The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has been investigated. The solubility of …
Phosphogypsum produced from wet-processed phosphoric acid mainly consists of calcium sulfate dihydrate, which is an important sulfur resource. The traditional sulfuric acid and cement process based on phosphogypsum suffers from unstable cement quality owing to impurities such as phosphorus and fluorine and kiln ringing caused by the low-melting phase. This study …
High Valuable Materials from Phosphogypsum and Carbon Dioxide Sh. El Rafie a, Fatma M. Zaher a, ... The reaction shows the preparation of potassium sulfate and Portlandite (Portland cement). C. Preparation of CaCO 3 and (NH 4) ... Carbonation is the principal process used for the preparation of calcium carbonate on an industrial scale. ...
The invention relates to a process for preparing a pure, crystalline sodium sulphate by working up natural minerals which contain, besides thenardite and/or mirabilite, additionally glauberite, calcium sulphate and water-insoluble naturally occurring materials in the form of magnesium aluminium silicates. A process is proposed which, with as small as possible a plant expense, …
The process conditions for two-step conversion of phosphogypsum to make K2SO4 are obtained from single factor experiment: The optimal experimental condition for the first-step …
The paper discusses process conditions of preparing potassium sulfate with phosphogypsum by one-step process.The best process factors are obtained by analyzing the single factor,which …
The potassium sulfate solubility in water as a function of temperature are representing in Fig. 2 [17].It is noted that the solubility (S) of potassium sulfate in water increases gradually when the temperature increases.According to the solubility data of potassium sulfate, the predicted concentrations (C = S / M (K 2 SO 4)) of the starting reagents K 2 CO 3 …
Article on Process of preparing chloride-free KNS compound fertilizers from phosphogypsum waste using a quaternary phase diagram, published in Process Safety and Environmental Protection 177 on by Brahim Bouargane+6. Read the article Process of preparing chloride-free KNS compound fertilizers from phosphogypsum waste using a …
