phosphogypsum in south africa

phosphogypsum in south africa

Purification of South African phosphogypsum for use as ...

The impurities in phosphogypsum greatly restrict its industrial use in Portland cement. We have investigated a method to remove the phosphorus impurities present in South African phosphogypsums, and found that the combination of a thermal and a sulphuric acid treatment was successful in removing most of the harmful phosphorus impurities.

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(PDF) Purification of South African phosphogypsum for use ...

9 Recently, scientists in North Africa are trying to use phosphogypsum in the manufacture of bricks to satisfy the high demand of housing. 10,11 Phosphogypsum is finding an increasingly widespread ...

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P H O S P H O G Y P S U M B E N E F I C I A T I O N

Three alternatives for the utilisation of the phosphogypsum from the Lowveld region of South Africa were investigated in this thesis, namely (a) its suitability for use as building material; (b) its conversion to saleable ammonium sulphate and precipitated calcium carbonate; and (c) the

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(PDF) Radioactive nuclides in phosphogypsum from the ...

PDF We evaluated the suitability of phosphogypsum from the Lowveld region of South Africa (LSA), for the manufacturing of building materials, with... Find, read and cite all the research you ...

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Chemical treatment of phosphogypsum and its potential ...

Jan 01, 2019  Chemical treatment of phosphogypsum and its potential application for building and construction ... P.O. Box 17011, Doornfontein 2088, South Africa Abstract This study investigated the use of a chemical treatment process to treat phosphogypsum waste generated from a phosphoric acid production plant and render the final product useful for ...

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[PDF] Radioactive nuclides in phosphogypsum from the ...

We evaluated the suitability of phosphogypsum from the Lowveld region of South Africa (LSA), for the manufacturing of building materials, with reference to (1) the National Nuclear Regulator Act 47 of 1999 and (2) the radioactivity associated risks as quantified in terms of the external and internal hazard indices, the activity concentration index and the radium equivalent.

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Effect of exchangeable sodium and phosphogypsum on the ...

(1985). Effect of exchangeable sodium and phosphogypsum on the hydraulic properties of several South African soils. South African Journal of Plant and Soil: Vol. 2, No. 4, pp. 179-186.

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Phosphogypsum Conversion to Calcium Carbonate and ...

Phosphogypsum Conversion to Calcium Carbonate and Utilization for . Remediation of Acid Mine Drainage. J Mulopo. 1 * and D Ikhu-Omoregbe. 2. 1. Council for Scientific and Industrial Research, Natural Resources and the Environment, Pretoria, South Africa. 2. Chemical Engineering Department, Cape Peninsula University of Technology, Cape Town ...

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Potential radiological impact of the phosphate industry in ...

Jun 01, 2020  In South Africa it is still practice to discharge phosphogypsum to the sea as dilute slurry . Environmental monitoring in the vicinity of the discharge point is encouraged to ensure acceptable levels of risk to humans and to the environment.

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South Africa: Environmental problems of Foskor’s ...

Apr 11, 2012  South Africa: Environmental problems of Foskor’s phosphogypsum waste April 11, 2012 at 10:20 ( Fertilizers , Phosphate Fertilizers ) The majority owned by the state-owned Industrial Development Corporation, Foskor phosphoric acid and fertilizer

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Utilization of phosphogypsum in CO2 mineral sequestration ...

Jan 01, 2020  However, prospective processes for large-scale utilization of phosphogypsum are still under investigation. This industrial by-product is a problem in several countries of the world such as Morocco, Tunisia, South Africa, China and Florida . It has a value which is not enough exploited.

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An investigation into the effect of various chemical and ...

Aug 01, 2003  In South Africa, major gypsum deposits are located far from cement-producing plants. Increasing transport costs have forced cement companies to seriously consider the replacement of natural gypsum with close by phosphogypsum resources.

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Phosphogypsum and its potential use in Croatia: challenges ...

Jun 28, 2021  Radiological characteristics of phosphogypsum. The concentrations of naturally occurring radionuclides in phosphate rock depend on the origin of the rock. The largest world deposits of phosphate rock are in Morocco, South Africa, Florida, China, India, and Egypt . Total global phosphate deposits are estimated to 163 billion tonnes.

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(PDF) Radioactive nuclides in phosphogypsum from the ...

PDF We evaluated the suitability of phosphogypsum from the Lowveld region of South Africa (LSA), for the manufacturing of building materials, with... Find, read and cite all the research you ...

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Chemical treatment of phosphogypsum and its potential ...

Jan 01, 2019  Chemical treatment of phosphogypsum and its potential application for building and construction ... P.O. Box 17011, Doornfontein 2088, South Africa Abstract This study investigated the use of a chemical treatment process to treat phosphogypsum waste generated from a phosphoric acid production plant and render the final product useful for ...

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Capture and storage of CO 2 into waste phosphogypsum: the ...

Mar 23, 2016  South Africa has an opportunity to sequestrate up to 0.2 % of its CO 2 emission and 100 % of its phosphogypsum generation through the Merseburg. Chou et al. ( 1995 ) are the latest to evaluate the Merseburg process on pilot scale and the concluded that the process is technically feasible for flue gas desulfurization gypsum.

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(PDF) Geotechnical Properties and Application of Lime ...

Residual deposits of Phosphogypsum are readily available in large quantities in South Africa and currently are landfilled or pumped into the sea, as there are limitations to engineering ...

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An investigation into the effect of various chemical and ...

Aug 01, 2003  In South Africa, major gypsum deposits are located far from cement-producing plants. Increasing transport costs have forced cement companies to seriously consider the replacement of natural gypsum with close by phosphogypsum resources.

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Phosphogypsum (PG): Uses and Current Handling Practices ...

South Africa: Radiological content and dose assessment of PG Source Total annual effective dose to the critical group due to the application of Phosphogypsum in the agricultural sector. (mSv/a) (modelled) o to 2 years 2 to 7 years 7 to 12 years 12 to 17 years Adults Phosphogypsum in Agriculture 0.0066 0.0047 0.0056 0.0086 0.0031

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A LABORATORY INVESTIGATION INTO THE STABILIZATION OF ...

soil properties. In South Africa, stabilization is usually effected using a combination of mechanical densification and the addition of a binder to the soil. Two waste materials, PFA (a power station waste) and phosphogypsum (a waste from the fertilizer industry) have been shown to

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Utilization of phosphogypsum in CO2 mineral sequestration ...

Jan 01, 2020  However, prospective processes for large-scale utilization of phosphogypsum are still under investigation. This industrial by-product is a problem in several countries of the world such as Morocco, Tunisia, South Africa, China and Florida . It has a value which is not enough exploited.

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Beneficiation of waste fly ash and phosphogypsum-the ...

Waste phosphogypsum (PG) was treated with citric acid, oxalic acid, sodium carbonate and sodium bicarbonate to reduce the contaminants in the material and render the material applicable for other applications. The chemical composition revealed that the material was laden with contaminants such as fluorides and phosphorous which have a ...

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Environmental impact and management of phosphogypsum ...

Phosphogypsum (PG) is an industry solid waste produced from phosphoric acid manufacture. To reduce environmental pollution of the PG, H2C2O4 was employed to

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Geotechnical Properties and Microstructure of Lime-Fly Ash ...

Sep 02, 2018  The raw phosphogypsum was obtained from a phosphoric acid manufacturing plant in South Africa. The treated phosphogypsum was produced by treating the raw phosphogypsum with mild citric acid to reduce its radioactivity. The effect of stirring speed on the leaching of raw PG with citric acid was studied by investigating the speed of 200, 400, and ...

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GYPSUM MARKET RESEARCH STUDY - zitholele

greenhouse gas emissions and supporting the South African Government’s commitment to the Kyoto Protocol. 4.1 Current gypsum supply In South Africa, gypsum is available from natural deposits or as a synthetic by-product such as phosphogypsum, FGD gypsum

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South African Journal of Chemical Engineering

b University of Johannesburg, Department of Civil Engineering Sciences, P.O. Box 524, Auckland Park, 2000, South Africa ARTICLE INFO Keywords: Phosphogypsum Leaching Kinetics Citric

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Capture and storage of CO 2 into waste phosphogypsum: the ...

Mar 23, 2016  South Africa has an opportunity to sequestrate up to 0.2 % of its CO 2 emission and 100 % of its phosphogypsum generation through the Merseburg. Chou et al. ( 1995 ) are the latest to evaluate the Merseburg process on pilot scale and the concluded that the process is technically feasible for flue gas desulfurization gypsum.

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GYPSUM IN SOUTH AFRICA

SOUTH AFRICA 7 3.1 Location and Type of Gypsum Mines in South Africa 7 3.2 Production, Sales and Prices 8 3.3 Imports 9 ... 4.4 Condition of South African Phosphogypsum Dumps 16 4.5 Uses for Phosphogypsum 16 ...

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Raman spectroscopic study of phosphogypsum thermal ...

Raman spectroscopic study of phosphogypsum thermal reduction with the carbonaceous material. Spectrochim Acta A Mol Biomol Spectrosc. 2015 Oct 5;149:317-22. doi: 10.1016/j.saa.2015.04.017. Epub 2015 Apr 25.

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Geotechnical properties and application of lime modified ...

Residual deposits of Phosphogypsum are readily available in large quantities in South Africa and currently are landfilled or pumped into the sea, as there are limitations to engineering applications due to the radionuclides content. In this study, mild acid treated residual phosphogypsum was stabilized with Lime Fly Ash (LFA) binder, and the ...

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Recovery of thorium from phosphogypsum by acid leaching ...

South African phosphogypsum (from Phalaborwa) contains high levels of thorium that could be recovered for industrial use. The study was conducted to determine the best acid for leaching thorium from phosphogypsum; to investigate the effect of solid to liquid ratios and of concentration on the efficiency of the process; and to study the effect ...

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Recovery of Sulfur From Phosphogypsum: Conversion of ...

of phosphogypsum has accumulated in Florida stock­ ... Austria, the Republic of South Africa, and Poland (2). The processes involve the reductive roasting of gypsum using coal, natural gas, carbon monoxide, or hydrogen to produce sulfur dioxide, which is converted to sulfuric acid.

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Beneficiation of waste fly ash and phosphogypsum-the ...

Waste phosphogypsum (PG) was treated with citric acid, oxalic acid, sodium carbonate and sodium bicarbonate to reduce the contaminants in the material and render the material applicable for other applications. The chemical composition revealed that the material was laden with contaminants such as fluorides and phosphorous which have a ...

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(PDF) Waste Phosphogypsum – Toward Sustainable Reuse in ...

Waste Phosphogypsum – Toward Sustainable Reuse in Calcium Sulfoaluminate Cement Based Building Materials. Chemical and Biochemical Engineering Quarterly. Neven Ukrainczyk. Download PDF. Download Full PDF Package. This paper. A short summary of this

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Industrial Lime Industrial Gypsum - SAKG

South Africa is particularly fortunate to be naturally endowed with significant reserves of limestone that are ideal for the production of high quality industrial lime. With access to superior lime raw material across the country, SA Lime Gypsum is able to produce, market and deliver high quality industrial lime products at affordable prices ...

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Agrispex – Soil Productivity Expertise

In South Africa currently, the value of pasture dry matter in dairy farm operations is estimated to be approximately R2000/ton. In overseas studies, it has been estimated that the response in terms of milk production ranges from 9 to about 16 kg milk per kg fertilizer N applied. This arises not because of any significant increase in yield per ...

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Leaching kinetics on the removal of phosphorus from waste ...

Jan 01, 2019  South African Journal of Chemical Engineering (2019-01-01) . Leaching kinetics on the removal of phosphorus from waste phosphogypsum by application of shrinking core model

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How phosphate is mined and processed

reserves are found in Russia, Finland, South Africa and Brazil. Most phosphate reserves are from sedimentary rocks. The phosphate forms in the shallow oceans mainly due to bacterial activity, but only when several conditions are met. ... phosphogypsum is piled up around the processing plant. Wastewater is also produced. Much is reused, but some ...

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UMSAEP UM-UWC Linkage Report

after grinding the phosphogypsum at 5 min and 15 min were respectively D80=31.3 and D80=22.6. The D80=31.3 distribution obtained at 5 min was selected to be used for the zeta analysis due to short time of grinding. Figure 2: Particle size distribution of dry phosphogypsum (P 50=96 μm) 0 10 20 30 40 50 60 70.) 2 Theta degree

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