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Liquid solid separation method for processing gypsum serum
The invention relates to a liquid-solid separation method for treating gypsum slurry. The gypsum slurry to be treated is pumped from a liquid storage tank into a new type hydrocyclone, and...
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Flotation separation of scheelite from gypsum using Pb-BHA …
The surface properties of scheelite and gypsum were similar, making it difficult to achieve flotation separation of scheelite from gypsum using DDA and SDS. This paper investigated the use of a new collector, Pb- benzohydroxamic acid (Pb-BHA complex), for the flotation separation of scheelite and gypsum.
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Apparatus and method for recycling gypsum wallboard
An apparatus and method for recycling gypsum wallboard is described and claimed. Gypsum wallboard is formed from a gypsum core sandwiched between two sheets of heavy paper. The apparatus has a crushing means to crush the gypsum core of the wallboard and shred the paper covering. A grinding means further pulverizes the gypsum into a powder and tears the …
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A Novel Process to Recover Gypsum from Phosphogypsum
Presently, the main separation and purification methods for phosphogypsum are as follows. Phosphorus and fluorine in phosphogypsum are largely soluble in water. Owing to their …
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Method and apparatus to minimize air-slurry separation during gypsum
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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Solid-liquid separation techniques for efficient recovery of P2O5 …
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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Liquid solid separation method for processing gypsum serum
A gypsum slurry and solid separation technology, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of poor wear resistance, complicated production and high cost, and achieves reduction of solid phase content, reduction of floor space, The effect of protecting the environment
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CN101456577B
The invention relates to a liquid-solid separation method for treating gypsum serum, which comprises: pumping the gypsum serum to be treated into a novel hydrocyclone through a …
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Best Practice Guidance
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Comprehensive recovery of rare earth elements and gypsum from
Gypsum (CaSO 4 ·2H 2 O) possesses a density of about 2.0 g/cm 3 and the density values of SrSO 4, BaSO 4, La 2 (SO 4) 3, Ce 2 (SO 4) 3 are 3.96, 4.50, 3.60, 3.91 g/cm 3, respectively. Based on these physical property differences, gravity separation methods such as screening, reselection, hydraulic cyclone are strongly recommended.
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Method for separating calcium sulfate and calcium carbonate from
The present invention relates to a method for separating calcium sulfate and calcium carbonate from desulfurized gypsum waste (also known as by-product lime) containing calcium oxide, calcium carbonate and calcium sulfate generated in a flue gas desulfurization process. The method of the present invention comprises the steps of pulverizing the waste and mixing it with …
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Separation processes for the treatment of industrial flue gases
It is evident that, there is a critical need for more effective methods of separation than ever. As pollution transmission line standards are being raised, separation is now an integral part of the overall field of mitigation necessary to control flue gases. ... Water resistant blended cements containing flue-gas desulfurization gypsum ...
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Method and apparatus to minimize air-slurry separation during gypsum
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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Effective separation of metal impurities from gypsum nanosludge
This approach has the potential to establish a universal method for the high-efficiency separation of doped impurities from gypsum sludges, providing valuable theoretical insights into extracting metals from heavy metal-containing solid wastes. 2. Materials and methods 2.1 Materials
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Comprehensive recovery of rare earth elements and gypsum from
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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A new method for simultaneous separation and solidification of …
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 …
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Preparation of gypsum with high purity and whiteness from
The currently applied methods for impurity removal from phosphogypsum mainly eliminate the influence of phosphorus and fluorine impurities on gypsum-building materials 6,7,8,9,10.
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Method for separating calcium carbonate and gypsum
A method for separating a suspension containing gypsum granules and calcium carbonate granules and an aqueous solution, wherein the aqueous solution comprises at least one …
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Apparatus and method for recycling gypsum
A method and apparatus for recycling gypsum board which includes grinding the raw material into chunks, crushing the material further in a rolling mill which will reduce material sizes as well as partially knock gypsum off its backing paper. Material is then screened such that only gypsum material is then deposited into a hopper prior to a mixer assembly which mixes the various …
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COMPARISON OF GYPSUM DEWATERING …
There are several types of solid-liquid separation systems that can be used to dewater and dry the gypsum slurry. These include belt filters (CBF continuous and CI-BF continuous-indexing), …
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A new method for simultaneous separation and
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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GYPSUM BOARD ROOF UNDERLAYMENT SYSTEMS
The three methods of applying gypsum board as a roofing underlayment, in order of prefer-ence, are described below. LEDGER STRIP METHOD Combustible Roof Sheathing Roof Covering Roof Framing Area Separation Wall 5/8" (15.9 mm) Type X Gypsum Board Strips 2 x 2 (38 x 38 mm) Wood Ledger Strips Apply 5/ 8 in. (15.9 mm) type X gypsum board to the top
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Method of producing high purity gypsum
European Patent publication no. 2279151 discloses a method of purifying gypsum using magnetic separation and acid washing. The disclosed method will remove the majority of magnetic particles and any impurities that are soluble in acid solutions but will not remove insoluble and non-magnetic contaminates such as silica, which is one of the ...
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Selective flotation separation of gypsum and quartz using dodecyl …
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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JPH0812389A
Since the clogging is generated in the separation of the low grade gypsum containing fine particle sludge having 2-10mum particle diameter, a pre-coat layer for a high grade gypsum is previously formed on the filter cloth 16 before supplying. ... JPH0812389A - Method for separating and recovering low grade gypsum - Google Patents
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MY168644A
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 …
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A new method for simultaneous separation and solidification of …
DOI: 10.1016/j.seppur.2022.120656 Corpus ID: 246807814; A new method for simultaneous separation and solidification of arsenic from arsenic-bearing gypsum sludge using waste carbon cathodes
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Effective separation of metal impurities from gypsum nanosludge
The effective separation of metal impurities from gypsum sludges is crucial for both environmental protection and resource recovery. However, it is seriously limited by their entrapment within calcium sulfate crystal lattices. This study presents a universal strategy for metal extraction through combined con Environmental Remediation Celebrating the 10th …
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Usage of air jigging for multi-component separation of …
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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A rapid sample digestion and U-Th separation method for …
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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