For grinding aids to be used for calcium carbonate processing is from a supplier called Technochem. The grades which are used are the 252 for for fine and standard finenesses and TC 121 for superfine products. The dosage depends highly on the product fineness and the milling system type. Usually for products coarser than 20 microns, its not necessary to use grinding aids.For the pumps used, there are plenty of manufacturers and types. A general type is a diaphragm pump.
Can we use for dry grinding of iron ore, preparing pellet feed need -45 micron 85 is there any help of using grinding aid in mill performance and throughput.
For dry grind you dont need any chemicals. Fan above grinding unit will do the work of size separation. Few such dry grinding equipments are, A. RAYMONDS MILL, B. METSO Make verti-stirred mill, with dry cyclones.
For these grinding there is no need for dosing pumps, only air is used as medium. Blower is used for blowing air.
In Rajasthan many do such processing. But they use CaO Moisture to make powder and then do classification in cyclones. Grinding may be done or not depends on market requirement.
I am sorry but I guess you have misjudged my query. I am looking for Grinding Aid amp not air separators. Anyways thanks for your input.
The present invention relates to the use of polyacrylic acids which comprise sulfur-containing organic terminal groups having at least two carbon atoms, have an average molecular weight Mw of from 5 000 to 30 000 gmol and are at least partly neutralized by a base selected from the group consisting of the alkali metal hydroxides and ammonia as assistants for the wet milling of calcium carbonate.
The present invention also relates to finely divided aqueous suspensions of calcium carbonate which have been prepared by wet milling of calcium carbonate in the presence of these polyacrylic acids.
JP-A-2000-281959 describes the wet milling of calcium carbonate using acrylic acid homo- and copolymers which have different terminal groups and are neutralized by a base mixture. The preferred polymers have average molecular weights Mw of from 4 000 to 10 000 gmol and are present as a mixed alkaline earth metalalkali metal salt.
EP-A-113 048 discloses low molecular weight partly neutralized homo- and copolymers of acrylic acid Mw in the region of 1 000 gmol which are prepared in the presence of sulfur-containing regulators in a moving solid bed from polyamide powder and are recommended for a number of applications, inter alia as milling assistants for inorganic pigments.
EP-A-313 483 describes the use of the sodium salts of acrylic acid homo- and copolymers having an average molecular weight Mw of up to 7 000 gmol for the aqueous milling of lime. The polymers in the molecular weight range of from 200 to 1 900 gmol are claimed, but information about the regulators used in each case in the polymerization is not given.
Furthermore, DE-A-40 04 953 discloses homo- and copolymers of acrylic acid as milling assistants and dispersants for calcium carbonate, which have been neutralized by addition of calcium hydroxide before the polymerization and of sodium hydroxide solution after the polymerization.
DE-A-36 20 149 describes the preparation of acrylic acid homopolymers and in particular copolymers using an initiator system comprising hydrogen peroxide, ironIIsulfate and mercaptoethanol and the use of the unneutralized polymers as dispersants.
Finally, U.S. Pat. No. 6,395,813 discloses the use of phosphonate-terminated acrylic acid homo- and copolymers having an average molecular weight Mw of from 2 000 to 5 800 gmol as dispersants for calcium carbonate.
It is an object of the present invention to provide milling assistants for the wet milling of calcium carbonate which have excellent milling efficiency and provide calcium carbonate suspensions having excellent stability.
We have found that this object is achieved by the use of polyacrylic acids which comprise sulfur-containing organic terminal groups having at least two carbon atoms, have an average molecular weight Mw of from 5 000 to 30 000 gmol and are at least partly neutralized by a base selected from the group consisting of the alkali metal hydroxides and ammonia as assistants for the wet milling of calcium carbonate.
Calcium carbonate CaCO 3, which occurs primarily in the form of the minerals calcite and aragonite, is one of the most prevalent compounds on Earth.Calcium carbonate is not only the main component of marble, limestone and dolomite, it is also found in bones and teeth as well as the exoskeleton of crustaceans, coral, muscles, snails and protozoa.
Calcium carbonate fine amp Ultrafine Powder Process machine. For fine and ultrafine calcium carbonate powder processing, ball mill, Raymond mill and vertical roller mill cannot meet the output size. For fine and ultrafine grinding, we can use HGM micro calcium carbonate grinding mill, the fineness can get D97 30-2500 mesh 74-5 micron adjusted.
001 The present invention relates to the use of methyldiethanolamine as a grinding aid for cement and to methods of grinding cement clinker, and optionally fillers or cement replacements, with methyldiethanolamine, as well as to methods of obtaining cement in which methyldiethanolamine is used as a grinding aid and methods of obtaining concrete and mortar products therefrom.
002 In the field of cement technology various additives are used at different stages of the manufacturing process to achieve the desired properties and improve the efficiency of the process. One such additive is a grinding aid, which is used during the stage of grinding the cement clinker in a grinding mill. A grinding aid is used to reduce the amount of energy required to grind the clinker and therefore can improve the efficiency of the grinding stage. Grinding aids can also improve the hydration of the clinker, leading to an improved quality product.
003 In the present invention the term cement is used to refer to hydraulic cement, such as Portland cement. Portland cement also known as Ordinary Portland Cement or OPC may be defined as a cementitious material meeting the requirements of ASTM CI 50 or the requirements of European Standard EN197.1.
004 Portland cement is prepared by heating a mixture of raw components including calcium carbonate, aluminium silicate, silicon dioxide and miscellaneous iron oxides to a sintering temperature usually about 1450C, resulting in the formation of clinker. Portland cement clinker is formed by the reaction of calcium oxide with acidic components to give primarily tricalcium silicate, dicalcium silicate, tricalcium aluminate, and a ferrite phase 34C4AF34 tetracalcium aluminoferrite.
005 The grinding stage involves grinding this clinker with calcium sulphate.
008 The present invention has identified a new grinding aid that can provide desirable properties in the end product.
009 The present invention provides, in a first aspect, the use of methyldiethanolamine as a grinding aid for cement.
Jun 04, 2018nbsp018332Grinding aids Since its establishment in 2008, ROMIchem produces the best grinding aids for calcium carbonate, cement and minerals.The quality of our products is recognized by companies all over the world and it is for this simple reason that a small Italian business was able to become a market leader in a matter of months from its constitution.
Mineral Grinding Aid Product Description DARAGRIND is one of the largest product developments by GCP Applied Technologies in the field of Grinding Additives for minerals, cement raw materials, coal, pure calcium carbonate, limestone, silica and quicklime. Addition Rates The dosage rate of DARAGRIND can vary from 0.005 to 0.1 by weight. The.
Effect of the Molecular Structure of Polymer,,- grinding aid for calcium carbonate,25 Jul 2013, Abstract Polymer dispersants are widely used as grinding aids to reduce the viscosity of mineral particle, Key words Calcium carbonate CaCO3, stirred media mill, polyacrylate, molecular weight, polydispersity index 1CGM calcium carbonate mill .
The influence of SDS was the combinational effect of the following two factors reduction in grinding efficiency induced by the increase in viscosity of calcium carbonate slurry and the increase in grinding efficiency caused by the reduced surface free energy of particles, in which the former has a stronger effect than the latter one.
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