Phosphogypsum recycling in the building materials industry: assessment of the radon exhalation rate

Campos, Marcia P.; Costa, Lucas José Pereira da; Nisti, Marcelo Bessa; Mazzilli, B. P.

doi:10.1016/j.jenvrad.2017.04.002

Cited by 98 publications

(31 citation statements)

References 31 publications

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“…Therefore, the feeding pump is replaced by an industrial pump with a capacity of 11.5 MPa. Although the PGBS concentration is set to 65%, the actual concentration may fluctuate between 64% 8 Geofluids and 65% owing to industrial errors. The backfill pressures are recorded continuously, as shown in Figure 15.…”

Section: Geofluidsmentioning

confidence: 99%

“…Certain countries use PG as a building material or soil fertilizer, accounting for 15% of the total PG [6]. However, the remaining 85% of PG is placed in stockpiles on the ground without any process applied, which not only require large amounts of ground space but also cause critical environmental problems, such as chemical or radioactive pollution [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Backfilling Mine Goafs with Chemical Waste Phosphogypsum

Cao

Liu

et al. 2019

Geofluids

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To explore the feasibility of cemented paste backfill with phosphogypsum (PG), bleeding water and rheological tests (slump and on-site pipeline loop tests) were performed with PG backfill slurry (PGBS). In the bleeding water test, the PGBS concentration with minimal bleeding water was measured between 60.87 and 67.61%; in the rheological slump test, values of 61 to 68% were determined for the on-site pipeline loop test. The rheological pipeline loop test demonstrated that the resistance coefficient is lowest when the concentration is no higher than 65%. Through industrial experiments, PG slurry with a concentration of 64%–65% backfill was successfully applied to the goaf. The experimental results demonstrate that PGBS with characteristics of “less bleeding water” and “improved pumpability” is obtained when its concentration is between 61 and 65%. Paste-like PG slurry was proven to be optimal for cemented PG backfilling technology.

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Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Backfilling Mine Goafs with Chemical Waste Phosphogypsum

Cao

Liu

et al. 2019

Geofluids

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“…Studies on the radioactivity of building materials and waste used in their production are becoming more and more common [27][28][29][30]. So far, there is not a great deal of data about radon exhalation rate in building materials containing NORM residues [30].…”

Section: Introductionmentioning

confidence: 99%

Holistic Analysis of Waste Copper Slag Based Concrete by Means of EIPI Method

et al. 2019

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The aim of the research is a comprehensive evaluation of concrete using the EIPI method. In the evaluation the compressive strength of concrete and its durability properties represented by sorptivity and air permeability are taken into account. Since waste copper slag with increased natural radioactivity is used in the assessed concrete, additional evaluation is carried out taking into account the influence of natural radioactivity within the performance index. Additionally, the reference concrete, which is made without the use of waste copper slag, is evaluated for comparative purposes. In order to make the evaluation as comprehensive as possible, the concrete made with the use of three types of cement is subjected to CEM I, CEM II and CEM III assessments. If natural radioactivity is not taken into account in the evaluation, the best result of the most favourable value of Gross Ecological and Performance Indicator (GEPI) is obtained by the concrete made with waste copper slag, and if radioactivity is considered, the most favourable value of GEPI is obtained with concrete without addition of the waste. The results show that in both approaches the best result is achieved by concrete with CEM III cement. It follows from the above that although natural radioactivity has a significant impact on the EIPI evaluation result, the decisive factor is still the type of cement.

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“…The nat u ral ra dio ac tiv ity lev els and ra don ex hala tion rates in build ing ma te ri als have been a mat ter of con cern in re cent de cades [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this study, (1) the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in the build ing ma te ri als com monly used in the West ern Black Sea re gion of Tur key were mea sured us ing a gamma ray spec trom e ter equipped with a high pu rity ger ma nium (HPGe) de tec tor, (2) the 222 Rn con cen tration and 222 Rn ra don ex ha la tion rates (sur face and mass) of these ma te ri als were mea sured by ac tive method us ing a con tin u ous ac tive ra don mon i tor ing sys tem (AlphaGUARD PQ2000 PRO) with an ac cumu la tion con tainer, and (3) ra dio log i cal risks that may arise from the use of build ing ma te ri als were eval u ated by es ti mat ing their ra dio log i cal pa ram e ters.…”

Section: Introductionmentioning

confidence: 99%

Natural radiation exposure and radon exhalation rate of building materials used in Turkey

et al. 2018

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1 De part ment of Phys ics, Fac ulty of Sci ence and Let ters, Uni ver sity of Kastamonu, Kastamonu, Tur key 2 Mugla Sitki Kocman Uni ver sity, Mugla, Tur key 3 De part ment of Phys ics, Fac ulty of Sci ence and Let ters, Cukurova Uni ver sity, Adana, Tur key 4 Turk ish Atomic En ergy Au thor ity, Lodumlu, An kara, Tur key Sci en tific pa per http://doi.org/10.2298/NTRP1802159TMea sur ing the nat u ral ra dio ac tiv ity lev els and ra don ex ha la tion rates (sur face and mass) in build ing ma te ri als is es sen tial to eval u ate the ex tent of ra di a tion ex po sure (ex ter nal and in ternal) for res i dents in dwell ings. Gamma-ray spec trom e try with a high pu rity ger ma nium de tector was used to mea sure the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in some build ing ma te ri als used in Tur key. More over, an ac tive ra don gas analyser with an ac cu mu la tion container was used to mea sure their ra don sur face and mass ex ha la tion rates. Re sults showed that the ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K var ied from 5.2 ± 0.6 (satin plas ter) to 187.0 ± 2.4 (gran ite) Bqkg -1 , 2.6 ± 0.8 (gyp sum) to 172.2 ± 7.6 (gran ite) Bqkg -1 and 12.3 ± ±.17.0 (sand) to 1958.0 ± 83.4 (brick) Bqkg -1 , re spec tively. Ra don sur face and mass ex ha lation rates var ied from 2.9 (mar ble) to 2734.6 mBqm -2 h -1 (gran ite) and 0.033 (mar ble) to 53.866 mBqkg -1 h -1 (gran ite), re spec tively. The ac tiv ity con cen tra tion in dex, in door ab sorbed gamma dose rate and cor re spond ing an nual ef fec tive dose were es ti mated and com pared with the rec om mended limit val ues. The re sults in di cated that the build ing ma te ri als sam pled presented no sig nif i cant ra dio log i cal risk.Key words: nat u ral ra dio ac tiv ity, ra don ex ha la tion rate, AlphaGUARD, an nual ef fec tive dose, build ing ma te ri al S. Turhan, et al.: Nat u ral Ra di a tion Ex po sure and Ra don Ex ha la tion Rate of .

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Phosphogypsum recycling in the building materials industry: assessment of the radon exhalation rate

Cited by 98 publications

References 31 publications

Experimental Study on Backfilling Mine Goafs with Chemical Waste Phosphogypsum

Experimental Study on Backfilling Mine Goafs with Chemical Waste Phosphogypsum

Holistic Analysis of Waste Copper Slag Based Concrete by Means of EIPI Method

Natural radiation exposure and radon exhalation rate of building materials used in Turkey

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