DE1667065A1 - Grinding aid - Google Patents

Description

WoRp Grace & Coβ (4842)

Cambridge _{t m} Mass _o "V" St _a Ao Hamburg, the S ₀ Jimi 1970

P 16 67 065ο8 = 41
NEW UKTERLAQBN

Grinding aid

The present invention relates to the use an additive to improve the properties of Minerals »

When reprocessing pretreated or untreated Minerals these usually become too proportionate Grind small particles, which should be done as soon as possible sollο Here, grinding aids are often used to reduce the To increase the grinding speed or the fineness of the To increase particles at a given operating speed "without adversely affecting the ground product",

By breaking up the particles in the milling of minerals new high energy surfaces are formed which Oberflächenkröf also te even after supper process remain, and caking of the material or "poor debris ability give · This causes milled minerals by the Z ₀ Bo in Vibration occurring during transport are compressed in such a way that they are often semi-solid and cannot be poured out, unless considerable mechanical force is used to break up the compact mass.

109123 / 14S0 .: üu iJnteriagen 1 ^ .751 / ^ 2 hm 8aiz3dosfod * rwges «v.M. W?)

This agglomeration or adhesion of individual particles becomes labeled "Pestbacken" (paok set) and determined by the Pestback Index! this is a relative value, which is numeric indicates how far a particulate material is ready, free after a certain storage time or after transport to flow «The ratio of the Festback-Xndex of untreated» Material versus treated material is referred to as the "Pestback Ratio" and is used to compare two different samples of ground minerals »

This pestback index is determined as follows: 100 g of mineral are shaken in a 250 ml Erlenmeyer piston suf-a vibration plate for 15 seconds and then inserted horizontally in a chuck. The piston is then rotated about 100 ml per minute by 180 ° around its axis rotated until the material stuck to the piston crown collapses. The number of rotations of 180 ° that are required for the material to collapse results in the pestback index _o The greater the energy required to break up the stuck material, the higher the pestback index.

It has now been found that amine salts of arylhydroxy compounds 2, 3 ₀ phenol act as excellent grinding aids and as pestback inhibitors for minerals without causing any problems. in the case of cement, the strength of the concrete is impaired.

109823/1450

Accordingly, the invention relates to a mixture «which consists of one miner and one intimately mixed with this mineral Amine salt of an ary! Hydroxy "compound. Exists" for production the novel additives used according to the invention are one or more arylhydroxy compounds with one or more Amines mixed. The raw materials can be pure chemicals or starting materials with impurities »The processes for the production of these additives are known ,, Preferably, equimolar parts are amine and arylhydroxy compounds used

Preferably the aryl hydroxy compound consists of one Phenyl or naphthyl radical which is substituted by a hydroxy radical and which is otherwise unsubstituted or by one or more nitro groups «halogen groups, preferably, by chlorine« alkylrestey preferably with 1 to 5 carbon » atoms and especially methyl radicals, through aryl radicals, amino or alkoxy groups preferably having 1 to 5 carbon atoms substituted

Preferably the AmIn is a compound of the following general formula:

in which R is a hydrogen atom or a substituted or unsubstituted alkyl radical, such as hydroxyalkyl or aryl ZoBo alkaryl radical and R _{2 is} a hydrogen atom or a substituted or unsubstituted alkyl radical, e.g. B _{0 is} a hydroxy <= alkyl radical and R is a hydrogen atom, a hydroxyl radical or a substituted or unsubstituted alkyl radical, Z ₀ B _{0 is} a hydroxyalkyl or aryl radical or a compound of the following formula? -

in which RN is a substituted or unsubstituted pyrrolidinyl, pyrrolidyl, pyrrolyl, morpholinyl, piperidinyl or piperazinyl radical and R ^ is a hydrogen atom or an alkyl or hydroxyalkyl radical; or Y- (Rg) _n * in which Y is a pyridyl, pyrimidinyl or pyridizinyl radical and R ^ is a halogen atom or an alkyl or hydroxy radical and η has the value from 0 to 5 _β

Suitable amines are, for example, ammonia, ethylamine, diethanolamine, monoethanolamine, triethylamine, triethanolamine, Aniline, p-toluidine, m-phenylenediamine, dimethylaniline, diphenylamine, 2,4,6-tribromaniline, N-pheny! Hydroxylamine, ß-phenethylamine * Morpholine, pyridine, piperidine, pyrrole, pirroline, pyrrolidine, Pyridazln, pyrimidine, N-methylmorpholine, 4- (2-aminoethoxy) -

10902a / USO

■ - 5 -

ethylmorpholine, dimethylpyridine, dimethyläthyipyrrol and Piperazine

As minerals are naturally occurring inorganic minerals such as phosphate rock, partially processed minerals such as concentrated Elsenerz and mixtures iron minerals such as cement treated "clinker or ceramic substances in this way," For example, one can with such Mahlhilfe- 'forward beryllium oxide, limestone, gypsum * sound and Treating bauxite »Such grinding aids are particularly valuable for cement and especially Portland cement, in which they even lead to an increase in the strength of the set concrete Portland cement is one of the hydraulic cements, which essentially consist of two calcium silicates and a smaller amount of calcium aluminate« Such Cements are produced "by processing an intimate mixture of finely" distributed limestone together with clayey material to form a clinker and then grinding this together with about 2 $ gypsum or with another calcium sulphate in order to achieve the desired setting properties of the Fe to achieve ready-to-use cement * The amine salts were preferably added to the clinker in order to increase the grinding efficiency - and to avoid subsequent caking of the finished cement; However, they can also later be sugosefezfe "The improvement% igßn® & stick is independent of the timing of the addition, and it is particularly ®tn® Erhöhung- of strength from"

bound concrete reached

The MahZhl Ifamittel according to the invention are either dry or liquid used "For the sake of simplicity, aqueous solutions are used" exactly the production "stream can be attributed * Less readily soluble grinding 'tool' came with a corresponding wetting agent ζ .Β. Natriuadodeoylbenzenesulfonat are emulsified. The grinding aid can be added to the mineral before grinding or can be added to the grinder at the same time as the material.

If only the sticking is to be reduced or a better flowability is to be achieved - ζ .B * when conveying or pneumatic transport · so the grinding aid can any other time during the work-up can be added.

The amount of grinding aid can be within a wide range however, preferably 0.001 to 1 and in particular 0.004 to 0.4 J6 solids, based on the Qewioht of mineral solids, added, Bs is none upper limit of the amount of grinding aid added, however Usually only as much is added to achieve the desired

1Q9823 / USO

<. 7 -Flowability and to achieve the desired surface.

The grinding aids according to the invention are preferably grounded used alone, but can also be processed together with one or more other grinding aids or other additives.

The invention is explained in more detail below with the aid of examples explained.

example 1

In the following table the effectiveness of the Triäthanolaminphenoxydes used as Mahlhilfemittel 1st reproduced was that äquiraolarer by mixing parts of triethanolamine and phenol produced. The measurement results were obtained with a projection land cement Type 1, the ball mill in the laboratory steel ·> at 99 ⁰ C and 3402 rpm was ground _o Amount of additive in % surface after increase compared to (pesticides per pesticide) Blaine cnr / g blank sample

0.01 3114 4.21 0.02 3128 5.20 0.05 3121 4.45 0.04 3134 5.41 . 0.06 3134 4.89 0.08 3184 7.09

1QS823 / U50

Example 2

A grinding aid was prepared by mixing 34 parts by weight of a mixture of phenol and cresol in the ratio of 50:50 with 65.9 parts by weight of a mixture of morpholine and triethanolamine in the ratio of 50:50. The grinding efficiency was determined with Portland cement type 1, the was milled in a LaboratorlumstahlkugelmUhle at 110 ⁰ C and 4941 revolutions. At a content of 0.12% by weight, based on the cement weight, there was an increase in the values for the Blaine surface of 6.75 pounds compared to the blank sample.

The additives according to the invention are also used with good results when grinding minerals other than cement used, such as as a grinding aid for Phosphate rock and iron ore.

■ 109823/14 50

Claims (4)

-. - 9 patent claims 1. Use of an amine salt of an arylhydroxy compound as an additive to minerals, especially cement and cement-forming mixtures « 2. The use of an additive according to claim 1 in an amount of 0.001 to 1 wt% and preferably 0.04 to 0.04 wt, based on the weight of the mineral _o 3ο Use according to claim 1 or 2, characterized in that a triethanolamine phenoxide or a reaction product of morpholene and triethanolamine with phenol is used. 4. Mineral mibohung, characterized by the presence of a Salt, intimately mixed with the mineral, that comes from an aroin and an arylhydroxy compound was formed by reaction at the hydroxyl group, ue: ech. • ναό documents (λπ. 7 § ι Ab ». 2 No. ι sutz 3 d« * Xnd »rungtarjt«. V. A, Pt. Int :, ι 1Ü9823 / U5Q