آخرین محصولات
Resource utilization of Industrial gypsum and its prospect
Pointing out that industrial routes such as preparing sulphuric acid co-production cement, calcium ferrite and conversion of ammonium to sulphuric acid by industrial gypsum are feasible, which ...
Process and plant for the production of cement and sulfuric acid
Process for the preparation of cement and sulfuric acid according to the so-called Muller-Kuehne method, in which with the addition of residues to the raw meal and residues to the chemically reactive carbon calcium sulfate cleaved in the rotary kiln and then the CaO at above 1200 ° C in the presence of SiO 2, Al 2 O 3 and Fe 2 O 3 burned to cement and the SO 2 -containing flue …
Co-preparation of calcium sulfoaluminate cement and sulfuric acid …
A life cycle assessment also showed that the co-production of calcium sulfoaluminate cement and sulfuric acid using the decomposition of industrial by-product gypsum has a lower environmental ...
Effects & Results of Acid Attack on Concrete
The chemical reactions involved in sulphuric acid attack on cement based materials can be given as follows: Ca(OH) 2 + H 2 SO 4 ==> CaSO 4.2H 2 O. 3CaO.2SiO 2.3H 2 O + H 2 SO 4 ==> CaSO 4.2H 2 O + Si(OH) 4. Effect of Nitric Acid on Concrete. Nitric acid usually occurs in chemical plants producing explosives, artificial manure and other similar ...
The Anhydrite Process for Sulfuric Acid and Cement
In the process as originally designed, a dry ground rawmix was made comprising anhydrite (or gypsum), shale and/or ash, sand and coke. This was fed to a simple rotary kiln and burned to produce clinker from the hot end and an exhaust gas containing sulfur dioxide.
US6613141B2
A method and apparatus for recovering calcium sulfate di-hydrate (gypsum) from a precipitation reaction between cement kiln dust and commercial, spent or waste grade sulfuric acid solution. The gypsum recovered from this process acts as a necessary functional additive for use in the production of hydraulic Portland cement. The invention advantageously provides for a method …
PAPER OPEN ACCESS Acid attack on hardened cement …
Acids also can be classified by solubility of their calcium salts in water (Tab. 1), because this property strongly affects the rate of an acid attack on concrete. Specimens made of hardened cement paste (HCP) or cement mortar are often used to study the corrosion resistance of a cementitious material.
Frontiers | Performance of high-belite calcium sulfoaluminate cement …
In addition, when the concrete made using ordinary Portland cement (OPC) is exposed to a sulfuric acid environment, the dissolution of CH occurs followed by the formation of gypsum (CaSO 4 ·2H 2 O). This process introduces further damage due to sulfate attack, i.e., expansion due to ettringite formation and subsequent cracking, as reported by ...
Co-preparation of calcium sulfoaluminate cement and sulfuric acid …
DOI: 10.1016/j.jclepro.2020.121801 Corpus ID: 219064874; Co-preparation of calcium sulfoaluminate cement and sulfuric acid through mass utilization of industrial by-product gypsum
Preparation of gypsum with high purity and whiteness from …
The sulfuric acid slurry containing anhydrous gypsum in the lower layer was vacuum-filtered, washed with deionized water, and dried in an oven at 60 °C for 4 h to obtain high-quality PPG.
SULFURIC ACID RESISTANCE OF STRAIN HARDENING …
be related to weight gain of sulfuric acid-exposed cement concrete in early exposure periods, which has been reported in many other studies. Chang et al. suggested that such weight gain could be attributed to many factors, including continuous cement hydration, formation of gypsum due to acid attack, and increase in absorbed water of specimens [20]
CN113307519A
The main component of the gypsum is calcium sulfate, which is decomposed to obtain calcium oxide and sulfur dioxide. Calcium oxide and partial sulfur element in the gypsum are useful components for cement production, sulfur dioxide can be purified and recovered in the sintering flue gas to produce liquid sulfur dioxide or industrial sulfuric acid products, compared with the …
Characteristics of Solid Mineral Phase Transitions During Sulfuric Acid …
The acid co-production of cement is a prominent research focus for the large-scale, high-value utilization of phosphogypsum in the context of dual-carbon strategies. This paper builds on extensive research conducted by its authors on the co-production of sulphoaluminate cement clinker through acid production from gaseous-sulphur-reduced …
Author: Subject: Sulfuric acid from gypsum
Sulfuric acid from gypsum I have made the following research: 2 CaSO4 + 2 SiO2 + C → 2 CaSiO3 + 2 SO2 + CO2 SO2 + O2 (V2O5@400-600C) → SO3 SO3 + H2O → H2SO4 This dictates that 2720 grams of calcium sulfate would generate 1960 grams of sulfuric acid by theory. The idea is that the gypsum is roasted with sand and coke at high temperatures.
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 sulfuric acid attack and the control of drying shrinkage. 2. Materials and Methods 2.1. Materials. In this research, the concrete specimens were made using OPC CEM I as per EN ...
Co-preparation of calcium sulfoaluminate cement and …
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 …
CN1124228A
The present invention uses the low grade natural diaquo gypsum as main raw material whose SO3 content is only 34.7-40.0% and content of CaSO4 is 59-68%, after stoving dehydration to semiaguo gypsum, it is mixed with coke and correct material of Si, Al and Fe in accordance with the specific proportion and milled together into raw material of gypsum, through rotary kiln it is …
SVXP
which is made of sulfuric acid modified steel slag, β-hemihydrate gypsum and calcium aluminate cement. With this, the hydration rate of anhydrite-Ⅱ phosphogypsum is clearly increased and setting time shortened. The performance of self leveling mortar prepared is as per JC/T 1023-2021, with softening coefficient of 0.8. 1. Introduction
The impact of original aggregate and attached mortar types …
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), which then accumulated within the permeable layers [36]. At this stage, the mortar layer on the G-RL surface started to detach, exposing the aggregates, while the G-RQ specimens ...
PHOSPHOGYPSUM: A Review of the Florida Institute of …
directed toward producing SO2 for sulphuric acid manufacture and cement as the solid product, Cement formation is accomplished by adding quantities of other raw materials to …
Manufaturing method of neutralized gypsum for cement …
Disclosed is a method for manufacturing neutralized gypsum for cement using semiconductor waste sulfuric acid. A method for manufacturing neutralized gypsum for cement according to one embodiment of the present invention includes: a) a step of producing a mixture by mixing a calcium compound and a hydrogen peroxide decomposing agent; b) a step of …
Characteristics of Solid Mineral Phase Transitions During …
Gas sulfur reduction of phosphogypsum to make acid co-production of sulfoaluminate cement clinker is an effective method to solve the problem of large amounts of …
Sulfuric acid attack on hardened paste of …
Cement and Concrete Research, 2000. This study has investigated the corrosion of different hardened cementing materials, such as Portland cement (PC), alkali-activated blast furnace slag cement (ASC), lime ± fly ash (LFA) blend and high …
Effects of sulfuric acid attack on hydrated calcined clay–limestone
Effects of sulfuric acid attack on hydrated calcined clay–limestone cement mortars ... The paper presents experimental findings on the performance of Limestone Calcined Clay Cement (LC3) in acidic media. LC3 was made by inter-grinding a blend of 50 % clinker with ground 30 % Fired Rejected Clay Bricks (FRCB), 15 % limestone and 5 % gypsum ...
EVALUATION OF POTENTIAL COMMERCIAL PROCESSES …
acid plants are the most common means of converting phosphate to a soluble form. The principal chemical reaction that occur's during the wet process is the digestion of …
Co-preparation of calcium sulfoaluminate cement and …
The experimental results show that calcium sulfoaluminate cement can be prepared using the decomposition of industrial by-product gypsum, and its mineral formation, …
Resistance to Sulfuric Acid Corrosion of Geopolymer Concrete …
1. Introduction. Concrete durability refers to the resistance of concrete against the action of aggressive environmental media which threaten the normal service of concrete components [].The actions of these aggressive environmental media are usually summarized as acid attack [], sulphate attack [], and chloride-induced corrosion [].In the different forms of …
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 …
Effects Of Acid Deposition On The Properties Of Portland Cement
It does, however, combine with water and oxygen to form sulfurous and sulfuric acid, both of which will attack concrete. Sulfuric acid attacks concrete (a) by converting calcium carbonate to gypsum, which is subsequently leached away, and (b) by reacting with calcium compounds to form salts which crystallize, producing enormous stresses within ...
KR102038327B1
The present invention relates to a method for manufacturing gypsum for cement, and more particularly, to a method for preparing neutralized gypsum that can be added to cement using sulfuric acid wastewater or phosphate gypsum generated in a semiconductor or phosphate fertilizer manufacturing process. .
محصولات مرتبط
- معادن برونبرگ
- گزارش پروژه آسیاب مینی توپی هند
- شرکت های معدنی در ژوهانسبورگ
- دیسک آسیاب توپی سنگ مرمر سنگاپور
- فیلتر شکن منگنز
- ویژگی تسمه نقاله
- فروشگاه های ماشین آلات لاهور
- خرید ماشین آلات سنگ شکن در آفریقای جنوبی
- نقشه های یک گیاه کائولن
- تصاویر برای دستگاه تراشکاری
- مراحل استخراج سنگ معدن زیرزمینی
- قیمت دستگاه سنگ شکن در آفریقای جنوبی
- شن و ماسه آسیاب به سیلیس
- معدن روی کلرادو برای فروش
- فیدر ویبراتور برقی را کنترل کنید