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gypsum grinding patent

US7861955B2 - Wet-grinding gypsum with

The process of the present invention includes obtaining a feed material having an initial median particle size. A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry. The slurry is wet-ground to reduce the median particle size of the feed material. Optionally, the total amount of polycarboxylate dispersant is divided ...

EP2209749A1 - Wet-grinding gypsum with ... - Google

EP2209749A1 EP08849120A EP08849120A EP2209749A1 EP 2209749 A1 EP2209749 A1 EP 2209749A1 EP 08849120 A EP08849120 A EP 08849120A EP 08849120 A EP08849120 A EP 08849120A EP 2209749 A1 EP2209749 A1 EP 2209749A1 Authority EP European Patent Office Prior art keywords feed grinding slurry dispersant particle size Prior art date 2007-11-15 Legal status (The

US4132565A - Accelerator for gypsum slurry - Google

US4132565A US05/847,224 US84722477A US4132565A US 4132565 A US4132565 A US 4132565A US 84722477 A US84722477 A US 84722477A US 4132565 A US4132565 A US 4132565A Authority US United States Prior art keywords accelerator gypsum gypsum board lbs particle size Prior art date 1977-10-31 Legal status (The legal status is an assumption and is not a legal conclusion.

GYPSUM SET ACCELERATOR AND METHOD OF

2018-3-12 · A modified gypsum set accelerator and a method of preparing the same is provided, which includes dry loose finely ground particles of a mixture of ground dry calcium sulfate dihydrate and a grinding aid selected from one or more of beta-naphthalene sulfonate formaldehyde condensate, trimetaphosphate phosphate salt, tripolyphosphate salt, tetra-pyrophosphate salt, and pregelatinized

US6164572A - Apparatus and method for recycling

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 shredded paper into pieces that are ...

Patents Assigned to National Gypsum Properties - Justia ...

2016-10-17 · Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming ...

Calcining Gypsum Patents and Patent Applications (Class ...

2016-6-16 · Calcining Gypsum Patents (Class 423/171) Method of preparing a polyrotaxane and polyrotaxane. Patent number: 10954331. Abstract: The present invention relates to a method of preparing a polyrotaxane, said method comprising: performing a radical copolymerization of at least (a) a first polymerizable monomer having a stopper group, and of at ...

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Search and read the full text of patents from around the world with Google Patents, and find prior art in our index of non-patent literature.

Patents Assigned to THE UNITED STATES GYPSUM

Justia - Patents - Patents and Patent Application Resources. Abstract: A process and apparatus for producing a healed stucco having lowered water demand without loss of normal strength development potential which comprises, while blending a small amount of water with the calcined gypsum, simultaneously or substantially simultaneously grinding the calcined gypsum so as to increase the

US Patent for Gypsum fiber board and method for

2017-6-20 · A gypsum fiber board produced in a Siempelkamp dry-process, comprising 75 wt % to 90 wt % (relative to the total dry mix) of calcium sulfate hemi-hydrate and 10 wt % to 25 wt % (relative to the total dry mix) paper fibers, wherein the calcium sulfate hemi-hydrate is a mixture of α-calcium sulfate hemi-hydrate and β-calcium sulfate hemi-hydrate, wherein the content of α-calcium sulfate hemi ...

US Patent Application for Method and apparatus for ...

2006-3-14 · The subject invention relates generally to methods and apparatuses for calcining gypsum. The apparatuses and methods place a gypsum particle optimizer in close association with the impact mill so that all the gypsum supplied to the impact mill has to enter the gypsum particle optimizer prior to the gypsum entering the impact mill, and so that heat generated from the impact mill enters into the ...

Patents Assigned to National Gypsum Properties - Justia ...

2016-10-17 · Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming ...

Manufacture of gypsum board from FGD gypsum -

United States Patent 4502901 . Abstract: By-product gypsum, which is formed during a flue gas desulfurization process, (FGD gypsum) is carefully formed as an aqueous slurry of crystals having a mean particle diameter of between about 35 microns and 80 microns and filtered, which filter cake is substantially completely dried before calcination ...

SET ACCELERATOR FOR GYPSUM HYDRATION -

Grinding calcium sulfate dihydrate exposes fresh nucleation sites that speed formation of the dihydrate gypsum. Exposure to humidity deactivates the nucleation sites in as little as a few hours. To preserve the active surfaces, it is known to treat ground calcium sulfate dihydrate with a starch, such as sugar, to prevent oxidation.

10TPH Gypsum Grinding Plant in Iran

10TPH Gypsum Grinding Plant in Iran. Powder making equipment adopts our company’s exclusive patent products——MTW series European type Trapezium Mill. The whole line is designed to be reasonable and concise; the craft is coherent and compact; the equipment layout is compact; the production is environmental and low carbon; the operation is ...

US7070134B1 - Centrifugal grinding mills - Google Patents

The present invention relates to a centrifugal grinding mill comprising a vertical axis of revolution ( 1 ), a nutating axis ( 2 ) intersecting axis ( 1 ) at a point of nutation symmetry ( 3 ), a grinding chamber ( 4 ) symmetrical about axis ( 2 ) connecting with feed passage ( 5 ) at its upper end and having discharge openings ( 6 ) of a screening element ( 26 ) located within a plane area ...

US Patent for Process for the manufacture of wet process ...

Justia Patents Sulfuric Acid US Patent for Process for the manufacture of wet process phosphoric acid using wet-grinding of the phosphate rock feed Patent (Patent # 4,044,107)

US1740551A - patents.google

US1740551A US29254A US2925425A US1740551A US 1740551 A US1740551 A US 1740551A US 29254 A US29254 A US 29254A US 2925425 A US2925425 A US 2925425A US 1740551 A US1740551 A US 1740551A Authority US United States Prior art keywords lens grinding edge wheel beveling Prior art date 1925-05-09 Legal status (The legal status is an assumption and is not a legal conclusion.

Patents Assigned to National Gypsum Properties - Justia ...

2016-10-17 · Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming ...

10TPH Gypsum Grinding Plant in Iran - LIMING(Shanghai)

2021-4-9 · 10TPH Gypsum Grinding Plant in Iran. Powder making equipment adopts our company’s exclusive patent products——MTW series European type Trapezium Mill. The whole line is designed to be reasonable and concise; the craft is coherent and compact; the equipment layout is compact; the production is environmental and low carbon; the operation is ...

10TPH Gypsum Grinding Plant in Iran - bezdechu.pl

10TPH Gypsum Grinding Plant in Iran Product description: Powder making equipment adopts our company’s exclusive patent products——MTW series European type Trapezium Mill. The whole line is designed to be reasonable and concise; the craft is coherent and compact; the equipment layout is compact; the production is environmental and low ...

10TPH Gypsum Grinding Plant in Iran

10TPH Gypsum Grinding Plant in Iran. Product Description. Powder making equipment adopts our company’s exclusive patent products——MTW series European type Trapezium Mill. The whole line is designed to be reasonable and concise; the craft is coherent and compact; the equipment layout is compact; the production is environmental and low ...

US Patent for Process for the manufacture of wet process ...

Justia Patents Sulfuric Acid US Patent for Process for the manufacture of wet process phosphoric acid using wet-grinding of the phosphate rock feed Patent (Patent # 4,044,107)

Patent Center | USPTO

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Patent Search and Analysis - CNIPA

Patent Range. More. CN 19850910~ 20210622. US 17900731~ 20210325. JP 19130206~ 20210325. KR 19731023~ 20210315.

Rules for Implementation of the Patent Law of the People's ...

1985-1-19 · Article 1 These Rules are formulated in accordance with the provisions of Article 68 of the Patent Law of the People's Republic of China (hereinafter referred to as "the Patent Law "). 第一条 根据《 中华人民共和国专利法 》(以下简称 专利法 )第 六十八条 的规定,制定本细则。. Article 2 "Invention" in

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