A process for preparing the anhydrite binder of claim 1 consisting essentially of sequentially calcining the phosphogypsum by-products derived from the production of phosphoric acid by the wet method at a temperature of between about 450° to 12,000° C. for a time sufficient to produce a calcined granulated product having a pore volume of less ...

The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the setting duration up to 13-38 min, the …

Preparation and application of fine-grinded cement in. The main component of the micro-grinding media (MGM) is SiO 2, with excellent abrasion resistance and chemical stability, and its Mohs hardness is greater than 7.It is a kind of grinding medium with its size finer than the traditional large grinding medium, and can increase the touchpoints between cement and large grinding media ...

Anhydrite binder calcined from phosphogypsum Ceramics – Silikáty 54 (2) 152-159 (2010) 155 was 9.1-9.2. The specific surface area was 1900 m2/kg. The cristabolite, the lisetite, the vaterite, the anorthite,

The effects of calcination and modification on the morphology (shapes and textures) and crystal structure of anhydrite powders were studied. The results show that, calcination at 100°C causes anhydrite to disintegrate into smaller crystals, accompanied by a slight increase in d-spacing. Without calcination and modification, the solidification time and curing time of anhydrite are 15 and 77 h ...

Optimization of the activation process for natural anhydrite. The aim of the present work is to provide the conditions for the activation of natural anhydrite in order to use it as a binder suitable for applications in the building industry. This natural anhydrite appears mixed …

Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates.In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant.One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum.It has many uses in industry. All forms are white solids that are poorly soluble in water.

L V., N D. Anhydrite binder calcined from phosphogypsum. Ceramics – Silikáty, 2(2010) 152–159. Google Scholar. F.d.C. Holanda, H. Schmidt, V.A. Quarcioni. Influence of phosphorus from phosphogypsum on the initial hydration of Portland cement in the presence of superplasticizers.

The analysis of the effect of the additives on the properties of the anhydrite binder (Tables 2, 3) shows that the binding of the calcined material with the additives of the dust from a cupola ...

Academia.edu is a place to share and follow research. Browse By Title: "Durability of perfluorosulfonic acid and hydrocarbon membranes: effect of humidity and temperature"

Anhydrite binders. Anhydrite binders are produced by thermal treatment at 600–700°C and the subsequent addition of activators for setting time regulation (lime, dolomite, blast furnace slag). When natural anhydrite is used, the raw materials are subjected to drying and grinding. ... Estrich gypsum is high-temperature calcined gypsum obtained ...

Anhydrite binder calcined from phosphogypsum Ceramics – Silikáty 54 (2) 152-159 (2010) 153 CaCl2, K2Cr2O7 was investigated in several studies [5, 6, 7, 11, 12, 13 ...

The invention relates to a binder and a ready-mix mortar for anhydrite flow flooring and a flow flooring produced therefrom. The binder comprises an industrial gypsum which is converted into anhydrite by means of thermal treatment, with aggregates being added to the anhydrite.

The present invention relates to an anhydrite binder and to the method of making the same from the gypsum by-product (phosphogypsum) resulting from the production of phosphoric acid by the wet method, said binder comprising particulate anhydrous CaSO 4 with an insoluble CaSO 4 content of at least 93%, an average particle size diameter of 5 to 30, with 15% by weight or more of the particles ...

The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the setting duration up to 13-38 min, the compressive strength of the dry ...

12%The effects of calcination and modification on the morphology (shapes and textures) and crystal structure of anhydrite powders were studied. The results show that, calcination at 100°C causes anhydrite to disintegrate into smaller crystals, accompanied by a slight increase in d-spacing. Without calcination and modification, the solidification time and curing time of anhydrite are …

Abstract: Hydraulic binder comprising: at least one first calcium aluminosilicate derivative with a fineness of less than 6000 Blaine, slag microparticles with a fineness of greater than or equal to 6000 Blaine in an amount of between 1 and 35% of the total weight of the binder, preferably of between 5 and 15%, at least one source of calcium sulphate and at least one base in an …

Then PG was calcined at 150 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C for 3 h in a muffle furnace to obtain hemihydrate or anhydrite. After the calcination, the calcined PG (CPG) was ground to a specific surface area (420 ± 20) m 2 /kg, and the particle size distribution of CPG was shown in Fig. 2.