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The reduction of free water can be achieved by water reducing agent. It is proposed that the quality ratio of raw materials is as follows: 80% phosphogypsum, 17% phosphorus slag powder, 3% CaO, 2% cement, 0.8% water reducer, 0.22%–0.35% retarder, and 0.43–0.46 water-to-cement ratio, which effectively solves the aforementioned problems.
Aug 17, 2017· 2.1. Materials. The main raw material used in this study was phosphogypsum, which is a byproduct of phosphoric acid production. Phosphogypsum is a type of calcium sulfate dihydrate processed and marketed as agricultural gypsum, and its calcination when applying different temperature ranges yields different types of calcium sulfate.
the manufacture of commercial construction products. Manufacture of anhydrite cement from phospho-gypsum is recommended [1]. On the investigations of durability, as compared to the plain hemihydrate plaster, anhydrite binding material shows much lower fall in strength and loss in weight [2]. Phosphogypsum raw material is successfully
Nine cubes were casted to study 7, 28 and 56 days strength of concrete. By incorporating fly ash with phosphogypsum the results of workability and compressive strength were improved. Also the rate of strength gain is higher in phosphogypsum plus fly ash mix concrete. Keywords: Flyash, Phosphogypsum, Strength, Workability I. Introduction
phosphogypsum, the strength of concrete mixtures is affected by the moisture at the time of testing. Better compressive strength attained with calcined phosphogypsum [16]. Study with up to 40% cement replacement by phosphogypsum gave 10% level optimum [21]. G.M. Sadiqul Islama et .
Nov 30, 2018· Phosphogypsum (PG) which is a waste byproduct of fertilizer production is the promising source of the gypsum industry. In order to explore the application of hemihydrate PG (HPG) as a substitute of hemihydrate gypsum, the setting and hardening characters of HPG plaster at different pH after neutralization were examined and contrasted with hemihydrate flue gas desulfurization gypsum (HFGD) plaster.
Oct 04, 2019· The potential for applying washing (leaching) process for modifying phosphogypsum as raw material in cement production is summarized in Figure 14. It is clearly that some components were reduced after washing in significant percentages. Thus, all the impurities were converted into inactive compounds in these samples especially U, SiO 2 and P 2 ...
The invention uses large scale of industrial waste in the smelting or chemical manufacturing course as raw material, which reduces waste from polluting environment. The invention discloses a high-strength waterproof plaster brick and preparing method, which comprises the following parts: 40-90 percent plasters dihydrate, 10-60 percent hydraulic ...
Phosphorus gypsum is generally powder, the appearance is gray, grayish yellow, light green and other colors, contains organic phosphorus, sulfur compounds, bulk density 0.733-0.88g/cm3, particle diameter is generally 5 ~ 15um, the main component is calcium sulfate dihydrate, content counted about 70 ~ 90%, among which secondary ingredients contained vary with different phosphate rock .
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Production of raw materials : Building, gypsum, phosphogypsum, citric acid plaster, gypsum and other fluorine. Plasterboard knowledge: gypsum board making machine --- Plasterboard is a building material made of gypsum as the main raw material. It is a light weight, high strength, thin, easy processing and noise insulation and fireproofing ...
Efforts have been made to make high strength alpha plaster from phosphogypsum, a by-product of phosphoric acid industry. Phosphogypsum was autoclaved in slurry form (phosphogypsum .
Jan 01, 2017· Use of industrial by-products as construction material can help to achieve sustainability in this industry. Phosphogypsum, a by-product in phosphoric acid manufacturing process, produced in bulk quantity especially from the fertilizer industry, typically used as a .
Feb 01, 2005· The high strength anhydrite plaster can be produced by heating the waste phosphogypsum at 1000 °C whereby the impurity of P 2 O 5 is converted into an inert insoluble calcium pyrophosphate and the fluoride partially get voltalized. Hence, no wet treatment of the phosphogypsum is .
Gypsum plaster/silica composites prepared by dry blending (0.2-10 %) natural sand, silica fume or silica gel and subsequently hydrated. Their physical and mechanical properties, including normal consistency, setting time, apparent porosity, bulk density and compressive strength, were determined after hydration for 7- and 28-days.
In this study, original PG and quicklime were used as raw material for the preparation of mortar, aiming to provide a method for the direct use of PG in cement-based materials. This work has ...
The invention relates to a high-strength water-proof gypsum plaster and a production method thereof. The inventive high-strength water-proof gypsum plaster is made from the following materials in weight proportions: 10-99% of gypsum-based composite binding agent, 0-90% of aggregates, 0.08-4% of additives and 0-16.1% of adsorbent. The production method comprises the following steps: weighing ...
May 11, 2018· This paper presents the results of the study on chemical and the physical properties of waste phosphogypsum (PG) of apatite origin from the former chemical plant Wizow, Poland which are important for further processing and economic use. The research was carried out to verify whether the waste might be useful as a raw material for rare earth elements (REE) recovery and the manufacture .
9.Edge Cutting and Sealing System of Gypsum Plaster Board production line. After turning over and folding the board, the system cuts the folded board and seals it together. The waste raw material after cutting is chopped into powder, let this powder absorb slurry, then can be used as accelerator. 10.
Geopolymerization of Industrial By-Products and Study of Their Stability upon Firing Treatment ... of raw materials, partially processed feed and components of final product carried out from the kiln by the exhaust ... These materials such as fly ash and phosphogypsum .
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Nov 11, 2019· Phosphogypsum is a phosphate fertilizer plants by-product and from some chemical industries, it can be used as a partial replacement of cement in concrete. This investigation has been carried out, in order to study the effect of partial replacement of cement with treated phosphogypsum (PG) in concrete.
Phosphogypsum is a waste by-product from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate. The wet chemical phosphoric acid treatment process, or 'wet process', in which phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and calcium sulfate, mainly in dihydrate form (CaSO 4 · 2H 2 O):
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