scholarly journals CLINOPTILOLITE WITH CESIUM IMMOBILIZATION TO POTASSIUM MAGNESIUM PHOSPHATE MATRIX

2017 ◽  
Author(s):  
S. Yu. Sayenko ◽  
V. A. Shkuropatenko ◽  
N. P. Dikiy ◽  
R. V. T Tarasov ◽  
K. A. Ulybkina ◽  
...  
Keyword(s):  
Magnesium Phosphate ◽  
Cesium Immobilization ◽  
Potassium Magnesium

scholarly journals Strengthening of potassium-magnesium-phosphate cement by adding additives of wollastonite and slag of metallurgical plants

2017 ◽  
Vol 117 ◽  
pp. 125-137
Author(s):  
S. Yu. Sayenko ◽  
V. A. Shkuropatenko ◽  
R. V. Tarasov ◽  
K. A. Ulybkina ◽  
L. M. Litvinenko ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Mechanical Strength ◽  
Homogeneous Structure ◽  
Magnesium Phosphate ◽  
Metallurgical Combine ◽  
Potassium Magnesium

The mechanical strength under compression, the structure and the phase composition of potassium-magnesium-phosphate cement with different amounts of additives (10, 15, 20 wt. %) of wollastonite and slag of the Mariupol metallurgical combine, “Zaporozhstal” plant and the Dnepropetrovsk metallurgical combine were studied. The resulting material has a homogeneous structure, which is represented by a potassium-magnesium-phosphate matrix with uniformly distributed inclusions of other phases. It is established that the compressive strength σc reaches a maximum with the addition of 20 wt. % wollastonite (23.2 N/mm2) and 20 wt. % of the slag Mariupol metallurgical combine (31.6 N/mm2).

Effect of Borax on Properties of Potassium Magnesium Phosphate Cement

2018 ◽  
Vol 914 ◽  
pp. 160-167
Author(s):  
Jin Bao Wen ◽  
Li Xia Zhang ◽  
Xiu Sheng Tang ◽  
Guo Hong Huang ◽  
Ye Ran Zhu
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Ph Value ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Time Dependent ◽  
Magnesium Phosphate ◽  
Dependent Effect ◽  
Time Dependent Effect ◽  
Potassium Magnesium

The effects of borax on the setting time, compressive strength, bond strength, drying shrinkage and pH value were investigated for potassium magnesium phosphate cement (MKPC). The results show that with the increase of borax dosage, the setting time is gradually extended, both compressive strength and bond strength are greatly decreased, the drying shrinkage rate is increased. Especially high dosage of borax, the extension of setting time is more obvious. Compared with that without borax, when the dosage of borax is 12.5%, setting time can be prolonged by 214.8%.The influence of borax dosage on the time-dependent effect of compressive strength shows that when the dosage of borax is 2.5%~5.0%, compressive strength increases rapidly from 4h to 1d, and increases relatively slowly from 1d to 3d. When borax dosage is less than 2.5% or higher than 5%, the law of time-dependent effect of compressive strength is the opposite. Compared to borax prior to magnesia addition, the pH value of the system is larger and the time of inflection point is advanced when borax and magnesia are mixed together at the same time. The increase of borax dosage can reduce the pH value of the system, and decrease the rising rate of pH value, at the same time the required time when the final pH value is relatively stable is longer.

scholarly journals Sintesis Kalium Magnesium Posfat Melalui Metoda Mekanokimia untuk Aplikasi sebagai Pupuk Slow Release[MECHANOCHEMICAL SYNTHESIS OF POTASSIUM MAGNESIUM PHOSPHATE FOR APPLICATION AS SLOW RELEASE FERTILIZER MATERIAL[Mechanochemical Synthesis of Potassium Magnesium Phosphate for Application as Slow Release Fertilizer Material]

Metalurgi ◽  
2017 ◽  
Vol 28 (1) ◽  
pp. 19
Author(s):  
Solihin Solihin
Keyword(s):  
Mechanochemical Synthesis ◽  
Slow Release ◽  
Potassium Phosphate ◽  
Magnesium Phosphate ◽  
Slow Release Fertilizer ◽  
Fertilizer Material ◽  
Potassium Magnesium

SINTESIS KALIUM MAGNESIUM POSFAT MELALUI METODA MEKANOKIMIA UNTUKAPLIKASI SEBAGAI PUPUK SLOW RELEASE.. Material yang bersifat slow release dapat digunakansebagai pupuk slow release, yakni jenis baru dimana pelepasan elemennya dapat diturunkan. Salah satu pupukslow release adalah potassium magnesium phosphate (KMgPO4). Analisa XRD terhadap material inimenunjukan bahwa kemurnian material ini cukup tinggi, hanya fasa KMgPO4 yang dapat dideteksi dalamsampel material ini. Analysis FTIR menunjukan bahwa teknik mekanokimia cukup berhasil untuk mensintesamaterial in. Analisa DTA menunjukan bahwa material ini stabil dari perubahan temperatur. Analisa morfologimenunjukan bahwa partikel yang tergranulasi memiliki ukuran sekitar 100 mikron. Dibanding dengan pupukbiasa yang nutriennya cepat larut, nutrien yang terlarut dari pupuk jenis slow release dapat diturunkan menjadisekitar 32-33, 22-24, and 0,1-0,7 %, untuk masing-masing potassium, phosphate and magnesium. Hasil ujileaching menunjukan bahwa material ini dapat digolongkan sebagai material yang bersifat slow release.

scholarly journals Preparation of Magnesium Phosphate Cement and Application in Concrete Repair

2018 ◽  
Vol 142 ◽  
pp. 02007 ◽  
Author(s):  
Sainan Xing ◽  
Chengyou Wu
Keyword(s):  
Magnesium Oxide ◽  
Calcination Temperature ◽  
Bonding Strength ◽  
Potassium Phosphate ◽  
Magnesium Phosphate ◽  
Dihydrogen Phosphate ◽  
Concrete Repair ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Potassium Magnesium

Potassium magnesium phosphate cement (MKPC) was prepared by using magnesium oxide (MgO) and potassium dihydrogen phosphate (KH2PO4, KDP). The effects of different calcination temperature, water-cement ratio and ratio on the operation of magnesium phosphate cement were studied. The effects of different water - cement ratio and ratio on the bonding strength of potassium magnesium phosphate cement and the application of potassium phosphate and magnesium cement in concrete repair and reinforcement were determined by experiments such as bending resistance, splitting, compression and bearing capacity. The experimental results show that the calcination temperature is 1100 °C, the calcination time is 1h, the settling time of magnesium oxide is 39min, and the compressive strength of one day reaches 53MPa. The water - cement ratio with the best bonding strength is 0.2, the mass ratio is 2:1.To meet the rapid repair of the construction requirements, is expected to be applied to the actual repair works.

scholarly journals The Influence and Action Mechanization of Mineral Mixed Material on High Fluidity Potassium Magnesium Phosphate Cement (MKPC)

2020 ◽  
Vol 4 (1) ◽  
pp. 29
Author(s):  
Qing Wu ◽  
Yan Zou ◽  
Jianhua Gu ◽  
Jun Xu ◽  
Rongjian Ji ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Aluminum Phosphate ◽  
High Water ◽  
Magnesium Phosphate ◽  
Hydration Reaction ◽  
X Ray Diffraction ◽  
Volume Deformation ◽  
Early Hydration ◽  
Mixed Material ◽  
Potassium Magnesium

Potassium magnesium phosphate cement (MKPC) is a type of chemically bonded ceramic material that has higher performance compared to traditional Portland cement. To develop the spraying and crack pouring process of MKPC, the mechanical properties, volume deformation, hydration temperature, and water stability of the high-fluidity MKPC with different mineral mixed materials and their influence laws were studied. The effects of phase composition and micromorphology of hydration products on the properties of MKPC and its mechanism were analyzed using X-ray diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA), and scanning electron microscopy (SEM). The results show that fly ash and metakaolin will not reduce the fluidity of MKPC paste because of their material properties, and silica fume will reduce the fluidity of MKPC paste because of its large specific surface area and high water absorption. Metakaolin can react with phosphate to form aluminum phosphate gel and fill the pores between the crystals because it has a higher activity, which can significantly improve its compressive strength. However, during the later stage of hydration, there will be slight expansion, which would reduce its bonding flexural strength. The MKPC-hardened paste mixed with silicon ash has optimal stability: therefore, it has the highest bonding flexural strength. Microcosmic analysis shows that mineral mixed material plays a physical filling role and participates in the hydration reaction as an active ingredient to improve the early hydration degree, which can change the crystal size and micromorphology of MKPC-hardened paste and make the structure more compact.

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