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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 ...
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 .
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 .
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 .
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 .
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
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 .
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.
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 ...
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.
Gypsum plaster board (GPB) popularly known as gypboard, is a low cost, light weight construction material made from aerated gypsum plaster and produced in varying thicknesses suitable for different applications. Gypsum is an important raw material used in the manufacture of cement.
Sep 23, 2019· Modern software was used to conduct X-ray phase analysis of gypsum raw material of different genesis: gypsum from several deposits, citrogypsum, phosphogypsum, vitamin gypsum, chemically pure gypsum,...
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The invention relates to a lightweight gypsum block and its preparation method. The block comprises the following components, by weight, 70-80% of desulfurized gypsum, 10-15% of ultrafine steel slag powder, 10-15% of perlite, 1-1.5% of a steel slag excitant, 0.3-0.5% of PP fiber, 0.05% of a retarder, 0.01-0.05% of a foaming agent and the balance water.
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.
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):
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 .
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
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.
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.
Dec 16, 2019· Phosphogypsum (PG), produced from phosphoric acid production, consists mainly of CaSO 4 ·2H 2 O and some impurities such as P 2 O 5, F −, and organic substances.Many phosphate fertilizer-producing countries face problems of PG waste with the high waste yield (5 kg PG generated 1 kg of phosphoric acid produced) [].The annual world production of PG has been estimated to be .
The phosphogypsum (PG) is a byproduct of the phosphate fertilizers manufacture. The world production estimated to 200 million tons per year induces environmental threats and storage problems ...
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 ...
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 ...
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