Gypsum-Made Sulfuric Acid Cement

Severe Sulfuric Acid Attack on Self-Compacting Concrete with

Abstract. The corrosion by severe sulfuric acid attack at pH 2 of two self-compacting concrete (SCC) types that are based on ordinary Portland cement (OPC) and granulometrically …

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Effect of magnesium sulphate and sulphuric acid attack on …

The paper describes an experimental study of the performance of GCCL cement concrete in a sulphate and acidic environment. The GCCL concrete is made of using mixture …

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Gypsum as a Feedstock for Low-Cost, Decarbonized …

Portland cement and sulfuric acid from gypsum via fossil-free variations of the once-prevalent Müller −Kühne (MK) process. With credit for coproduced sulfuric acid, a sulfur-driven …

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JPH0967118A

PROBLEM TO BE SOLVED: To produce a gypsum having constantly stable water content from a high fluorine containing-sulfuric acid waste liquid. SOLUTION: In a method for recovering …

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Influence of Na2SO4 Produced from Phosphogypsum …

Materials made using purified phosphogypsum show similar strength to those made with pure mineral gypsum, including Portland cement and slag cement. According to Ennaciri …

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High-iron sulfuric acid sludge cement

The present invention relates to a sulfate superferric cement made up by utilizing the offscum produced in the production of sulfuric acid, and its composition is formed from sulfuric acid …

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Durability of high-performance Nadjat DJERFAF concrete to …

The primary reaction product manifested on the concrete surface is gypsum, which is associated with volume expansion Eq. (3) and can induce tensile stresses in concrete, resulting ... to …

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Acid Attack on Concrete

Gypsum: CaSO4.2H2O, calcium sulfate which is found as a common constituent of cement. It is also produced by acid attack (sulfuric acid) on concrete. Hydration: Reaction between cement …

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PRODUCTION METHOD FOR PRODUCING CEMENT AND CO-PRODUCING SULFURIC ACID

Abstract The disclosure discloses a production method for producing cement and co-producing sulfuric acid from phosphogypsum. The method includes: pretreating and purifying the …

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Method of producing sulfuric acid and hydraulic cement from …

A method of making sulphuric acid which consists in preparing finely ground acid-washed argillaceous materials, mixing the same with finely ground gypsum in proportions to produce …

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(PDF) Acid Attack on Concrete-A Review

Index T erms- Acid, Concrete, Pollution, Durability. ... concrete made by blended cement containing. ... environments, namely 1% sulfuric acid (H2SO4) solution, 1% hydrochlori …

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Sulfuric acid attack on hardened paste of geopolymer cements …

X-ray line analysis (EDS) of the paste specimen after 60 days of exposure to pH 1 sulfuric acid (magnification = 40×). Figure 5. Corroded layer of the paste specimen developed after 60 days …

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PRODUCTION OF SULFUR FROM GYPSUM AS AN …

Gypsum (CaSO4. 2H2O) is produced by increasingly more industrial processes, for instance, when calcium carbonate or lime is used to neutralize sulfuric acid containing effluents or when …

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Production and resource utilization of flue gas desulfurized gypsum …

It is feasible to prepare sulphoaluminate cement from red mud produced by FGD gypsum and alumina; the cement clinker showed excellent mechanical strength (Wang, W.L. …

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Technology for production of cement and sulfuric acid by phosphor gypsum

A new production technique for manufacturing cement and sulphuric acid by using phosphogypsum is to combine the calcination process of nodulized phosphogypsum in hollow …

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EVALUATION OF POTENTIAL COMMERCIAL …

agitated reactor containing concentrated sulfuric acid, unattacked phosphate rock, recycled phosphoric acid, and gypsum crystals. Free sulfuric acid dissolves tricalcium …

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CN109336431A

The present invention relates to the producing cement from phosphor sulfuric acid new methods for making anti-agglomerant using calcium oxide as intermediate sulphur, comprising steps of …

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Enhancing Acid Resistance of Recycled Aggregate Concrete …

The results revealed that the specimen made with a mix combination of RHA15% and hybridization of Ar-GF0.5% and SF0.5% (S1–4) exhibited better resistance to sulfuric acid …

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Directions and Cases of Harmless Disposal and Comprehensive …

Leveraging phosphogypsum as the raw material, the facility can produce sulfuric acid with a concentration of 98% and cement, both of which meet the required standards. The …

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Enhancing Sulfuric Acid Resistance of Cement Paste through

Enhancing Sulfuric Acid Resistance of Cement Paste through Incorporation of CMK with Different Specific Surface Areas: An Analysis of Mechanical Properties and Durability ...

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Gypsum as a Feedstock for Low-Cost, Decarbonized Portland …

Here, we perform a technoeconomic analysis of processes to coproduce Portland cement and sulfuric acid from gypsum via fossil-free variations of the once-prevalent …

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CN106365476B

The present invention relates to a kind of method that desulfurized gypsum prepares sulphate aluminium cement co-producing sulfuric acid, this method replaces lime stone and the natural …

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Gypsum as a Feedstock for Low-Cost, Decarbonized …

Here, we discuss the coproduction of cement and sulfuric acid by gypsum reduction with elemental sulfur, a process that we call the SMK process and one that, like other cement decarbonization schemes, could reduce both …

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Co-preparation of calcium sulfoaluminate cement and sulfuric acid

Provided that CSA cement and sulfuric acid can be successfully co-produced, the utilization of IBP gypsum will be significantly improved, accounting for 60%–70% of raw CSA …

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Which Effect Does Acid Produce on the Properties of Concrete?

Concrete is made up of three primary materials: Cement – This binds the aggregate and water to form the hardened matrix. ... Acids like sulfuric acid react with calcium …

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Resistance of Wood Ash Concrete to Sulfuric Acid Attack

The acid resistance of concrete mainly depends on the concrete composition and cement type. ASTM C 150 Type II and IV are examples of sulfate-resistant Portland cement made by …

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Recycling, reusing and environmental safety of industrial by …

Besides the eight common industrial by-product gypsum types, there were also lesser-stored industrial by-product gypsum such as nickel gypsum, chromium gypsum, …

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Co-preparation of calcium sulfoaluminate cement and sulfuric acid

For example, the red gypsum can be used for cement production as a binder [50], green concrete [51], calcium sulpho-aluminate cement [52], ed concrete [53], …

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ACIDIC CORROSION OF HYDRATED CEMENT BASED …

usually is referred to as biogenic sulfuric acid corrosion. The harmful biogenic sulfuric acid is formed as the result of a relatively complex mechanism of both anaerobic and aerobic …

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The impact of original aggregate and attached mortar types of …

This phenomenon was the result of sulfuric acid solution penetrating the specimens and reacting with the cement hydration products to produce expansive gypsum (CaSO 4), …

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Gypsum as a Feedstock for Low-Cost, Decarbonized Portland Cement …

Production methods for cement and sulfuric acid are likely to change in the era of decarbonization. Cement is responsible for 8% of world carbon dioxide (CO2) emissions and …

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Gypsum as a Feedstock for Low-Cost, Decarbonized …

Portland cement and sulfuric acid from gypsum via fossil-free variations of the once-prevalent Müller −Kühne (MK) process. With credit for coproduced sulfuric acid, a sulfur-driven variant of …

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Understanding Gypsum Cement Composition: Essential …

Studies show that gypsum board, made from gypsum cement, can reduce construction time by 20-30%, which means more time for lunch breaks—score! Installing it also cuts costs in labor, …

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gypsum-made sulfuric acid cement

·The reaction between the cement particles on the concrete surface produces AFt gypsum 10% 20% 30% 40% and 50% and SF 5% on the durability of concrete against sulfuric acid attack …

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Effects of sulfuric acid attack on hydrated calcined clay …

Clay Cement (LC3) in acidic media. LC3 was made by inter-grinding a blend of 50 ... Portland pozzolana cement (PPC) and OPC in 3% of sulfuric acid at 23±1 C. The pre- ... limestone and …

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Sulphuric acid exposure of conventional concrete and alkali-activated

One of the most rapid cases of concrete degradation is that which occurs in sewage collection systems. In these systems the combination of bacteria, moisture, and …

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Co-preparation of calcium sulfoaluminate cement and sulfuric acid

The environmental impact of the co-preparation process of CSA cement and sulfuric acid using IBP gypsum decomposition was evaluated using a life cycle assessment …

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Effect on Sulfuric Acid Resistance and Shrinkage of Concrete

The reaction between the cement particles on the concrete surface produces AFt, gypsum, ... 10%, 20%, 30%, 40%, and 50%) and SF (5%) on the durability of concrete against …

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Technology for production of cement and sulfuric acid by …

A new production technique for manufacturing cement and sulphuric acid by using phosphogypsum is to combine the calcination process of nodulized phosphogypsum in hollow …

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Evaluating acid resistance of Portland cement, calcium aluminate cement

Portland Cement (PC) has poor resistance against aggressive acidic environment [1], [2].Acid attack is a commonly-observed phenomenon in sewer structures and is also …

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