Control foaming performance of phosphate rocks used for wet-process of phosphoric acid production by phosphoric acid

Li, Hongqiang; Ge, Wei; Zhang, Jun; Kasomo, Richard M.; Leng, Jiahao; Weng, Xiaoqing; Chen, Qian; Gao, Qian; Song, Shaoxian; Xiao, Linbo; Tian, Chengtao

doi:10.1016/j.hydromet.2020.105364

Cited by 37 publications

(14 citation statements)

References 20 publications

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“…As a high molar Ca/P ratio to obtain a high recovery and a low residual phosphate concentration in the treated effluent invariably will lead to contamination of the recovered calcium phosphate with calcium carbonate, choices will have to be made. It must be considered that high contaminations with carbonate are not wanted in view of the processing of the recovered calcium carbonate in the wet process for phosphate recovery [9]. This would lead to excessive use of acid and foaming.…”

Section: Discussionmentioning

confidence: 99%

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Phosphorus reclamation by end-of-pipe recovery as calcium phosphate from effluent of wastewater treatment plants of agroindustry

Monballiu

Ghyselbrecht

Pinoy

et al. 2020

Journal of Environmental Chemical Engineering

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Phosphorus is essential for live and must be recovered from all possible secondary resources. One of these secondary resources may be the effluent of a wastewater treatment plant in which no obvious measures are taken to remove or recover the phosphorus. Effluent water of the wastewater treatment facility of a potato processor was spiked with 40 -50 mg phosphate-P.L -1 to simulate such a water that can be subjected to an end-of-pipe recovery of phosphate. Simulations with PHREEQC were calculated and batch experiments were performed. Continuously stirred tank reactors (CSTR) were fed with Pspiked effluent. Increasing the Ca/P ratio promoted calcium phosphate precipitation but increased also the calcium carbonate contamination. With calcium added in fourfold excess relative to endogenous phosphate-P concentration, 90 % removal can be obtained. For the recovery of phosphorus from this purified effluent the same Ca/P ratio is necessary than in the case where phosphorus is recovered from nitrified UASB effluent. The recovery is stimulated by aeration, which however should not be continuous and by the addition of 5 g.L -1 hydroxyapatite and reaches up to 95 %. In contrast to what was expected based upon the batch experiments, but in agreement with the simulations, the precipitates contained up to 6 m% magnesium phosphate, which probably can further be reduced by using shorter hydraulic retention times in the reactor.

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Section: Discussionmentioning

confidence: 99%

“…Calcium carbonate as contaminant of calcium phosphate is not wanted as this will lead to the use of a supplementary amount of acid and the formation of carbon dioxide gas and foaming [9]. Magnesium, as e.g.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus reclamation by end-of-pipe recovery as calcium phosphate from effluent of wastewater treatment plants of agroindustry

Monballiu

Ghyselbrecht

Pinoy

et al. 2020

Journal of Environmental Chemical Engineering

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“…The total production of PG is expected to reach about 7-8 billion tons by 2025 (International Atomic Energy Agency). With the growing world population, the demand for phosphoric acid in agriculture [4], chemical industry, national defense and other fields is increasing [5]. Mineral resources are gradually depleted, showing a gradual decrease in high-grade ores [6], but the yield of PG and the purity of phosphoric acid mainly depend on the grade of phosphate rock [6].…”

Section: Introductionmentioning

confidence: 99%

Study of Semi-Dry High Target Solidification/Stabilization of Harmful Impurities in Phosphogypsum by Modification

Yang

et al. 2022

Molecules

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Phosphogypsum (PG) treatment is one of the research hotspots in the field of environmental protection. Many researchers both at home and abroad have devoted themselves to studies on harmless resource treatment of PG, but the treatment technology is unable to meet the demand of PG consumption due to the huge production and storage demands. In order to solve the problem of PG pollution, this study explored the different solidified effects of various modification formulations on the hazardous components in PG, using industrial solid waste calcium carbide slag (CCS) as an alkaline regulator; Portland cement (PC), polyaluminum chloride (PAC) and CaCl2 as the main raw materials of the solidification and stabilization formula and the water content in PG as the reaction medium. The results showed that CCS (0.5%), PC (0.4%) and PAC (0.3%) had a more significant solidified effect on phosphorus (P) and fluoride (F). PAC was added in two steps and reacted under normal temperature and pressure, and its leaching toxicity meets the requirements of relevant standards, which laid an excellent foundation for PG-based ecological restoration materials and filling materials, with low economic cost, simple process and strong feasibility. This will provide great convenience for the later mining and metallurgy.

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“…The membrane filtration, an emerging technique in this sector, is primarily used to remove particles base on their size [9]. Wet process production of industrial phosphoric acid contains diverse impurities including suspended solid, soluble compounds as well as organic matter coming from rock phosphate [10]. Clarification is an important step in the phosphoric acid purification process not only to increase the purity of produced acid but also to avoid some technical problems in industrial installations.…”

Section: Introductionmentioning

confidence: 99%

Recycling of Spent Reverse Osmosis Membranes for the Second Use in Clarification of Wet-Process Phosphoric Acid

Khaless¹,

Achiou²,

Boulif³

et al. 2020

Preprint

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Various techniques have been used to “clean-up” industrial phosphoric acid: precipitation, flotation, activated charcoal or clay treatment. To address membrane processes potential in phosphoric acid clarification process, this study explores the advantage of membrane techniques as new route for phosphoric acid clarification in an eco-efficient way through the use of “regenerated spent membrane”. Regeneration of the spent membranes was performed on of 0.15 m2 active area regeneration. These membrane samples were used to study the phosphoric acid clarification at a laboratory scale. They were immersed in an oxidizer for at most seven days. The samples were characterized systematically before immersion in an oxidant media. In this study, the potential to regenerate spent membranes and application of this media to clarify the 29% P2O5 phosphoric acid was demonstrated. This study shows, by tests that the reverse osmosis (RO) membranes achieve an abatement of 70% and 65% for solids and organic materials, respectively. These positive results will pave the way for implementing these membranes phosphoric acid treatment process. Moreover, besides being economically advantageous, the use of the spent membrane is likely an environmentally friendly route (no waste, no organic solvent and effluent to be regenerated later on).

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Control foaming performance of phosphate rocks used for wet-process of phosphoric acid production by phosphoric acid

Cited by 37 publications

References 20 publications

Phosphorus reclamation by end-of-pipe recovery as calcium phosphate from effluent of wastewater treatment plants of agroindustry

Phosphorus reclamation by end-of-pipe recovery as calcium phosphate from effluent of wastewater treatment plants of agroindustry

Study of Semi-Dry High Target Solidification/Stabilization of Harmful Impurities in Phosphogypsum by Modification

Recycling of Spent Reverse Osmosis Membranes for the Second Use in Clarification of Wet-Process Phosphoric Acid

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