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The invention discloses a method for preparing building gypsum powder by using phosphogypsum, which comprises the following steps: mixing phosphogypsum and production waste hot water under stirring, pulping, standing, and removing oil-containing impurities on the surface layer of the pulp; and (3) carrying out cyclone washing on the residual slurry in a …
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It is well-established that flotation reagents such as collector and frother are critical in impurity removal and whiteness enhancement. Pine oil, MIBC, and tributyl phosphate were used as frothers in reverse flotation to remove the organic matter and slime of PG, and the whiteness of the gypsum concentrate improved to a small extent, which was still unsuitable for …
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Request PDF | On Feb 1, 2024, Jialin Qing and others published Comprehensive recovery of rare earth elements and gypsum from phosphogypsum: A wastewater free process combining gravity separation ...
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Request PDF | A new method for simultaneous separation and solidification of arsenic from arsenic-bearing gypsum sludge using waste carbon cathodes | Arsenic (As)-bearing gypsum sludge, one of the ...
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The results showed that gypsum can be used as a selective inorganic depressant of calcite and for flotation separation of apatite from calcite, which provides a new method for the comprehensive utilization of gypsum solid waste.
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System and method for comminuting gypsum wallboard received from a series of processing hoppers and milling hoppers by discharge into an assembly including a feed hopper, a barrel and trommel screen assembly for separation and final removal of paper and non-ferrous materials from comminuted gypsum wallboard, and separate assembly for receiving and conveying …
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The use of air jigging for performing multi-component separation in the treatment of mixed construction and demolition waste was studied. Sorting tests were carried out with mixtures of equal bulk volume of concrete and brick in which fixed quantities of unwanted materials - gypsum, wood and paper - were added.
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The filtration of phosphogypsum is a ubiquitous step in the manufacturing of phosphoric acid. It is highly desired to achieve the minimum concentration of P2O5 in the phosphogypsum cake.
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The G-P Gypsum area separation wall assembly is designed for use in multi-family, multi-story townhouses with a total height up to 50 feet. Because it is constructed using gypsum board, the assembly is easy to ... 10.There are two code-compliant methods for installing a gypsum board roof underlayment: the ledger ...
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A method and apparatus for providing an evenly mixed additive enhanced gypsum slurry to a web. Calcined gypsum and water are inserted into a mixer (12) through at least one inlet (26,28) of the mixer (12). The contents are agitated to form a slurry. The slurry is passed from an outlet (34) of the mixer (12) into a conduit (38). An additive is introduced into the slurry along a length …
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The invention relates to a method for decolorizing and purifying desulfurized gypsum. The method comprises four steps of water washing of raw materials, crystal transformation, product washing and drying, and the recovery and utilization of mother liquor. The present invention utilizes the fact that CaSO 4 ·2H 2 O can be transformed into fine-grained CaSO 4 ·0.5H 2 O at 100°C and …
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In this study, we present tetradecyltrimethylammonium chloride (TTAC) as a novel flotation reagent for the selective separation of quartz from gypsum, addressing existing challenges in …
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The selective flotation separation of gypsum and quartz in phosphogypsum (PG) is an urgent problem that is very important for the high‐value utilization of PG. In the work, …
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The gypsum concentrate with a whiteness of 69.2 % and calcium sulphate dihydrate purity of 97.24 % was obtained via a simple and efficient method of "high-speed stirring …
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Separation apparatus and separation method for material related to absorbent article US20160214895A1 (en) * : : International Material Recovery Inc. Apparatus and method for recycling gypsum US20160235110A1 (en) * : : Frito-Lay North America, Inc. Method and apparatus for controlling the flow of product ...
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EP2934760A1 EP13811473.1A EP13811473A EP2934760A1 EP 2934760 A1 EP2934760 A1 EP 2934760A1 EP 13811473 A EP13811473 A EP 13811473A EP 2934760 A1 EP2934760 A1 EP 2934760A1 Authority
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A method and apparatus for providing an evenly mixed additive enhanced gypsum slurry to a web. Calcined gypsum and water are inserted into a mixer through at least one inlet of the mixer. The contents are agitated to form a slurry. The slurry is passed from an outlet of the mixer into a conduit. An additive is introduced into the slurry along a length of the conduit to achieve a flow …
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A method of purifying flue gas desulfurization (FGD) gypsum. The method includes the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing the aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step.
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en established on the methods of separating the PAS sludge in the phosphate industries. This investigation showed that the most used separati. e acid expressed as P2O5 and a dry solid to …
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The invention relates to a method for producing gypsum, salt and magnesium chloride, which mixes calcium waste liquid mainly containing calcium chloride and sodium chloride with high-low temperature salt which is a salt chemical byproduct to obtain feed liquid. ... The feed liquid after gypsum separation is evaporated, crystallized and ...
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Arsenic (As)-bearing gypsum sludge, one of the biggest As-bearing wastes, has seriously threatened ecological security due to the great mobility and leaching toxicity of As. Unfortunately, most of this sludge was discharged into tailing ponds without treatment. In this paper, a novel co-process of As-bearing gypsum sludge, waste carbon cathode (WCC) and Fe powder for …
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In this work, the examination of separation of gypsum from wastewater generated during the machining of casts and the method of waste gypsum management have been presented. This …
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The invention relates to a method for separating a suspension containing gypsum granules and calcium carbonate granules and an aqueous solution comprising at least one sodium salt, said...
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In this work, based on the synergistic regulation of gypsum phase transformation and iron speciation, a feasible method for deep removal of iron from red gypsum was proposed, which is conducive to ...
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the gypsum samples digested in K 2CO 3 solution are in agreement with our previous experiments, in which the gypsum samples were digested using mixed acids. Therefore, the proposed method can be used for rapid sample digestion and …
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A comprehensive guide to understanding liquid-solid separation methods for improving efficiency and effectiveness in various industries. Slurry Separation. San Diego, CA; sales@slurryseparation (619) 383-6312; Facebook-f …
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PURPOSE:To remarkably remove impurities from a solution after gypsum separation by bringing a solution after the separation of gypsum in a slurry at the outlet of an absorbing column into contact with an anion exchange membrane and a cation exchange membrane to remove Cl<->, F<->, Na<+>, etc., and then circulating the solution into the absorbing column.
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A method and apparatus are provided for providing a uniformly mixed additive-enhanced gypsum slurry to a web. The calcined gypsum and water are introduced into the mixer 12 through at least one inlet 26, 28 of the mixer 12. The contents are stirred to form a slurry. The slurry passes from the outlet 34 of the mixer 12 into the conduit 38.
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WO2023234462A1 PCT/KR2022/008767 KR2022008767W WO2023234462A1 WO 2023234462 A1 WO2023234462 A1 WO 2023234462A1 KR 2022008767 W KR2022008767 W KR 2022008767W WO 2023234462 A1 WO202
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Phosphogypsum (PG), a by-product of wet-process phosphoric acid production, holds significant potential for use in construction and other industrial a…
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