Synthesis of TiO2 nanopowders from red gypsum using EDTA as ...

TiO2 white pigments were used in various applications due to their ... The effect of time and temperature in sulphuric acid leaching processes was ... The sulfuric acid process, which can digest many kinds of low-titanium-content ... Red gypsum is synthetic gypsum produced during titanium dioxide ..... Cement Concr.

Sulfate attack in concrete - Understanding Cement

The displaced calcium precipitates mainly as gypsum. ... minerals in clay adjacent to the concrete - this can produce sulfuric acid which reacts with the concrete...

01-002-001Final - Florida Industrial and Phosphate Research Institute

PRODUCTION OF SULFURIC ACID FROM PHOSPHOGYPSUM. FINAL REPORT. By ... in South Africa to produce sulfur dioxide and cement clinker. ... adaptation of the ISU process to phosphogypsum with high-sulfur coal will be necessary. .... survival of white clover in a dry summer under high rates of gypsum addition.

Anhydrite Mineral | Uses and Properties - GEOLOGY.COM

An evaporite mineral used as a soil treatment and to produce construction ... Streak, White ... Anhydrite can be substituted for gypsum in some of its uses. ... Anhydrite has also been used as a source of sulfur in the production of sulfuric acid. ... in a kiln and used as a raw material for producing cement, plaster, and flooring.

Minerals and Their Uses

Asbestos is used to make friction products, asbestos cement pipes and sheets, ... of apatite and gypsum are mined, and calcite and dolomite are produced in ... of cement, its chemistry, and properties can be found in MacLaren and White (2003). .... the manufacture of sulfur, sulfuric acid, and sulfur dioxide; pellets of pressed...

What is Gypsum? - Eurogypsum

The depth of hydration can range from the surface of the ... Gypsum/Anhydrite for cement manufacture is supplied in crushed form for further fine grinding with ... quarters of its combined water is removed producing hemi-hydrate plaster (CaSO4,1/2H2O), ... Tricalcium Phosphate reacts with Sulphuric Acid to form Phosphoric.

Patent US2528103 - Method of producing sulfuric acid and hydraulic ...

Method of producing sulfuric acid and hydraulic cement from gypsum ... The sulphuric acid could b combined with phosphate rock and phosphoric acid ... amount of hydraulic cement, namely Portland cement, either white or grey, as well as...

Sciencemadness Discussion Board - sulfuric acid from gypsum CaSO4 ...

Also, came up with an industrial process for producing sulfuric acid from common ... it with water can produce very high purity acid or oleum very cheaply indeed. .... be improved", is something concrete that can be discussed in a useful way. ..... At white glowing heat, it volatilizes (Boussignault, Ann. Chim.

How does acid precipitation affect marble and lizenithne buildings ...

Jul 21, 1997 ... When sulfurous, sulfuric, and nitric acids in polluted air react with the calcite in ... Gypsum is soluble in water; although it can form anywhere on ... Gypsum is white, but the crystals form networks that trap particles of dirt and...

Titanium Dioxide Production - Barben Analyzer Technology

The sulfate process relies on sulfuric acid (H2SO4) to leach titanium from ... Titanogypsum (CaSO4) production can be a unique by- product of the ... for use in plasterboard and cement. ... it can be removed and white titanogypsum is produced.

Application of full factorial design to optimize phosphogypsum ...

It is found that the optimum conditions for sulfuric acid treatment are to have a loading .... State-owned Arab. Company for White Cement Industry produced 130,000 ... in cement production will increase the demand for gypsum as an additive.

Calcium sulfate

Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and ... All forms are white solids that are poorly soluble in water. ... behind a sheet of drywall will remain ...

Title Biochemical attack on concrete in wastewater applications : a ...

Oct 8, 2014 ... producing sulfuric acid; a more detailed explanation of the corrosion process is presented in a ... surface of concrete pipes takes the form of a white, mushy ... long as the pH is high enough for it to form and the gypsum can...

A Review of the Production Cycle of Titanium Dioxide Pigment

May 2, 2014 ... tion, we will show different uses of the titanium dioxide pigment as ... industry of TiO2 production in different fields such as agriculture, civil engineering, or cement ... He produced a white metallic oxide from the min- ..... (about 40% of total TiO2 production) using concentrate sulphuric acid and the chloride...

calcium sulfate | chemical compound | Britannica.com

ammonium sulfate production ... Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). ... It is commonly known in its dihydrate form, CaSO 4∙2H 2O, a white or colourless powder called gypsum. ... ...pollutants forming sulfuric acid can quickly erode the calcium-carbonate...

Accelerated Biodegradation of Cement by Sulfur-Oxidizing Bacteria ...

Jan 13, 2004 ... moautotrophs oxidize various sulfur compounds to produce sulfuric acid, which is responsible for the corrosion and deg- radation ... [Ca(OH)2] in the concrete to form gypsum (CaSO4 .... the cement samples could be reduced still further to values below 8.0 by increas- ..... Sand, W., E. Bock, and D. C. White.

IS536.qxd - Portland Cement Association

Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a ..... Fig. 11. Bacteria in sewage systems can produce sulfuric acid, .... masite and haloes of white thaumasite surround aggregates. At ... and gypsum.

Succession of Sulfur-Oxidizing Bacteria in the Microbial Community ...

Microbially induced concrete corrosion (MICC) in sewer systems has been a ... This succession of SOB species could be dependent on the pH of the concrete ... This suggested that the production of sulfuric acid by A. thiooxidans occurred ..... White powder-like depositions (most likely gypsum, CaSO4·2H2O) appeared on...

The kinetics of the reductive decomposition of calcium sulfate with ...

black and white photographic print for an additional charge. Photographs ..... production of calcium oxide and sulfur dioxide by heating gypsum at. 1150-1250*C in a ... cement and sulfuric acid from gypsum will be five to seven times that.