Laboratory Burning of Anhydrite from Phosphogypsum

2015 ◽  
Vol 1100 ◽  
pp. 60-63
Author(s):  
Dominik Gazdič ◽  
Karel Dvořák ◽  
Iveta Hájková

The objective of this work is a research in the sector of preparation of anhydrite II based sulphate binder made from secondary raw material resources applicable in industry specialised in production of mortar mixtures. In particular it was a laboratory burnout of anhydrite II from phosphogypsum, which is formed during production of phosphoric acid. The selection of burning mode was done upon the results [1]. The selected burning mode influence on mineralogical composition of formed anhydrite was monitored with subsequent setting of basic technological properties and monitoring of hydration process course.

2013 ◽  
Vol 838-841 ◽  
pp. 2338-2341
Author(s):  
Marcela Fridrichová ◽  
Karel Dvořák ◽  
Iveta Hájková

The insufficient occurrence of raw material resources on our territory was one of the historical reasons for marginal production of sulphated binders from secondary raw-material resources. Also the unprofitability of material production based on calcium sulphate was related to this fact. This was changed in the end of the last century when formation of waste raw materials increased with industrial development. Secondary gypsums became basic raw material for production of plaster boards, plaster mixtures and anhydrite self-levelling mixtures. Wet flue gas cleaning desulphation process during which the energogypsum is formed is nowadays realised in major part of our power stations. Annual production of the energogypsum produced in this way in particular power stations is about 250 kt. The energogypsum is generally stored in stock piles as a so called stabilisate and partially is delivered to cement works as a solidification regulator. Chemogypsum is produced in chemical works where waste waters with content of SO42- occur, which must be desulphated with lime in water ambient. Further it is formed in citric acid productions where also sulphated waters occur. Last but no least it is also produced in industrial production of phosphates. Production of titanium dioxide is another example of the industry where the possibility of gypsum formation exists.


2013 ◽  
Vol 818 ◽  
pp. 68-71 ◽  
Author(s):  
Dominik Gazdič

Within the work the questions of the slag-sulphate binder preparation were solved. It was specifically a monitoring of obtained technological properties and course of the hydration process in dependence on dosing ratio of particular binder components. A finely ground Stramberk blast furnace slag was the basic raw material to which Polish natural anhydrite was added together with Portland cement CEM I 42,5 N as alkaline exciter.


Author(s):  
Reymar R. Diwa ◽  
Estrellita U. Tabora ◽  
Botvinnik L. Palattao ◽  
Nils H. Haneklaus ◽  
Edmundo P. Vargas ◽  
...  

AbstractPhosphogypsum (PG) accumulates during wet-phosphoric acid production for fertilizers. In the Philippines, PG is partly (40%) utilized to produce gypsum walls and cement. This work assesses the radiological risks and resource opportunities associated with PG stacks in the Philippines. The conducted in situ radiometric survey measured the activity concentrations of 40K, 238U, and 232Th at 270 locations. Besides, another 120 surface samples were collected. Pure PG exceeds the recommended radiation limits, but simple dilution with conventional materials can make PG available as an inexpensive secondary raw material for construction. PG further contains relevant concentrations of rare earths and Y (195 ppm).


2015 ◽  
Vol 1100 ◽  
pp. 56-59
Author(s):  
Dominik Gazdič ◽  
Jana Stachová ◽  
Radek Magrla

The objective of this experimental work was to monitor the influence of applied external exciter on anhydrite obtained properties. As a basic raw material anhydrite imported from Poland was used, as hydration exciter a mixture of anhydrous sodium sulphate and Portland cement CEM I 42.5 R in total dose of 5 % by anhydrite weight was applied. In the first step the anhydrite underwent the setting of mineralogical composition using the X-ray diffraction analysis (XRD) and monitoring of grain size and shape by the scanning electron microscopy (SEM). In the next step the influence of applied mixing exciter on obtained basic technological properties according to standard CSN EN 13454 was monitored. It was the setting of basic technological properties of anhydrite binder with and without addition of the mixing external exciter and also the setting of strengths of standard anhydrite mortar with addition of external mixing exciter. Upon the obtained values the comparison with technical requirements of the standard for calcium sulphate binders was carried out and this anhydrite mortar was classified as well.


2017 ◽  
Vol 1143 ◽  
pp. 120-126
Author(s):  
Vasilica Viorica Corcoţoi Toniţă ◽  
Maria Vlad ◽  
Ilenuta Severin ◽  
Andrei Berbecaru

From making steel process result dust and slurry that can be used as a secondary raw material in the composition stack of ferrous materials for the sintering process. Together with other raw materials rich in Fe, SiO2, CaO, this waste can be significant on quality ferrous agglomerate due to the useful elements contained.The paper presents the results of chemical and mineralogical analysis of steelworks dust and experimental research with a view to introduce dust in the sintering process to increase the quality of agglomerate.


Author(s):  
D.Y. Bolgova ◽  
◽  
N.A. Tarasenko ◽  
Z.S. Mukhametova ◽  
◽  
...  

Nutrition is an important factor that affects human health. The use of plant proteins as various additives in food production has now been actively developed. The rich chemical composition of pea grains determines the possibility of application in the food industry. Peas are characterized by good assimilability and degree of digestion.


2016 ◽  
Vol 9 (1) ◽  
pp. 80-95
Author(s):  
Agus Sudibyo ◽  
Sardjono Sardjono

Crude palm oil (CPO)is the richest natural plant source of carotenoids in terms of retinol (pro-vitamin A) equivalent, whereas palm oil mill effluent (POME) is generated from palm oil industry that contains oil and carotenes that used to be treated before discharge. Carotenoids are importance in animals and humans for the purpose of the enhancement of immune response, conversion of vitamin A and scavenging of oxygen radicals. This component has different nutritional  functions and benefits to humaan health. The growing interest in the other natural sources of beta-carotene and growing awareness to prevent pollution has stimulated the industrial use of CPO and POME as a raw material for carotenoids extraction. Various technologies of extraction and separation have been developed in order to recover of carotenoids.This article reports on various technologies that have been developed in order to recover of carotenoids from being destroyed in commercial refining of palm oil and effects of some various treatments on the extraction end separation for carotenoid from palm oil and carotenoids concentration. Principally, there are different technologies, and there is one some future which is the use of solvent. Solvent plays important role  in the most technologiest, however the problem of solvents which are used is that they posses potentiaal fire health and environmental hazards. Hence selection of the  most safe, environmentally friendly and cost effective solvent is important to design of alternative extraction methods.Chemical molecular product design is one of the methods that are becoming more popular nowadays for finding solvent with the desired properties prior to experimental testing.ABSTRAKMinyak sawit kasar merupakan sumber karotenoid terkaya yang berasal dari tanaman sawit sebagai senyawa yang sama dengan retinol atau pro-vitamin A; sedangkan limbah pengolahan minyak sawit dihasilkan dari industri pengolahan minyak sawit yang berisi minyak dan karotene yang perlu diberi perlakuan terlebih dahulu sebelum dibuang. Karotenoid merupakan bahan penting yang diperlukan pada hewan dan manusia guna memperkuat tanggapan terhadap kekebalan, konversi ke vitamin A dan penangkapan gugus oksigen radikal. Dengan berkembangnya ketertarikan dalam mencari beta-karotene yang bersumber dari alam lain dan meningkatnya kesadaran untuk mencegah adanya pencemaran lingkungan, maka mendorong suatu industri untuk menggunakan CPO dan POME sebagai bahan baku untuk diekstrak karotenoidnya. Berbagai macam teknologi guna mengekstrak dan memisahkan karotenoid telah dikembangkan untuk mendapatkan kembali karotenoidnya. Makalah ini melaporkan dan membahas berbagai jenis teknologi yang telah dikembangkan guna mendapatkan kembali senyawa karotenoid dari kerusakan di dalam proses pemurnian minyak sawit secara komersial dan pengaruh beberapa perlakuan terhadap ekstrasi dan pemisahan karotenoid dari minyak sawit dan konsentrasi karotenoidnya. Pada prinsipnya, berbagai teknologi yang digunakan untuk mengekstrak dan memisahkan karotenoid terdapat perbedaan, dan terdapat salah satu teknologi yang digunakan untuk esktrasi dan pemisahan karotenoid adalah menggunakan bahan pelarut. Pelarut yang digunakan mempunyai peranan yang penting dalam teknologi ekstrasi; namun pelarut yang digunakan untuk mengekstrak tersebut mempunyai persoalan karena berpotensi mengganggu kesehatan dan membahayakan cemaran lingkungan. Oleh karena itu, pemilihan jenis teknologi yang aman, ramah terhadap lingkungan dan biaya yang efektif untuk penggunaan pelarut merupakan hal penting sebelum dilakukan desain metode/teknologi alternatif untuk esktrasi karotenoid. Pola produk molekuler kimia merupakan salah satu metode yang saat ini menjadi lebih populer untuk mencari pelarut dengan sifat-sifat yang dikehendaki sebelum diujicobakan. Kata kunci :    karotenoid, ekstrasi, pemisahan, teknologi, minyak sawit kasar, limbah industri pengolahan sawit.


2021 ◽  
Vol 672 (1) ◽  
pp. 012071
Author(s):  
N K I Mayasti ◽  
R Kumalasari ◽  
R Ekafitri ◽  
D Desnilasari ◽  
D N Surahman ◽  
...  
Keyword(s):  

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