HU199316B - Method for intensifying the milling of solid inorganic matters advantageously minerals - Google Patents

Abstract

The additive may comprise sodium alkylsulphonate or sodium alkylbenzenesulphonate, and may also include ethylene oxide, an ester, an alkylsulphate, an alkylbenzimdazolesulphonate, or triethanolamine. The additive may further comprise a potassium or sodium sulphate or phosphate salt in solution.

Description

The use or further processing of various minerals such as coal, ore, bauxite, perlite, tuff, dolomite, clay or other solid inorganic materials such as porcelain flour, slag, fly ash, ceramic semifinished products to produce the appropriate particle size, particle size distribution, also become necessary.

When grinding on an industrial scale, it is very important that the desired particle size is achieved with as little energy as possible.

In other words, by investing a given amount of energy, the amount of fine fraction (fraction having a particle size of less than 70 µm) should be as much as possible. Techniques for intensifying milling processes are known in the art. Thus, Hungarian Patent Publication No. 155,254 discloses a process in which a huge amount of auxiliary material is used in a concentration of 0.001 to 1% by weight; the milling aid is a phosphate compound containing organically bound nitrogen. With the use of the additive, the fraction with a particle size of less than 70 µm is milled by 17% more than the non-additive milling process. The same patent discloses that the use of the urea sesquifiphosphate triethanolamide additive in the grinding of cement clinker results in a 50X increase in milling capacity.

German Patent No. 2,251,935 discloses a milling process using aliphatic acetic acid ethers as a grinding aid for dry grinding of minerals, in particular pigments and fillers.

It is an object of the present invention to provide a more efficient milling process than known hitherto, i.e. a process which, while investing the same energy, results in a larger particle size fraction of less than 70 µm than prior art processes.

It has been found that the intensification of the grinding of minerals can be achieved by using an anionic and / or nonionic surfactant as a grinding aid in an aqueous solution for the grinding material. As surfactant, (C 10 -C 20 alkyl) benzenesulfonic acid and / or (C 10 -C 20 alkyl) sulfonic acid and / or (C 8 -C 20 alkyl) sulfate and / or (C 4 -C 20 alkyl) benzimidazole sulfonic acid and / or sodium salt of a petroleum sulfonic acid having an average molecular weight of 300 to 600 is used in an amount of 0.001 to 1 tX per mill. The grinding aid is preferably applied to the material to be ground in a spray solution in an aqueous solution of 2 to 20% by weight. The surfactant may contain from 1 to 50% by weight of potassium and / or sodium sulfate, chloride or phosphate per millimeter of surfactant.

The advantage of our process over known methods is that

- the desired particle size fraction is obtained with the same amount of energy invested,

- better milling efficiency,

- the capacity of the grinding equipment is increasing.

Our process is advantageously applicable to the production of ground coal for use in thermal power plants.

The invention is illustrated by the following Examples and Comparative Examples.

1. EXAMPLE EXAMPLE

In a laboratory ball mill (V = 0.35 cm ³ ; n = 16 rpm; mg / kg - 0.3 kg), 0.1 kg of carbon was stored. During grinding, the sled adheres to the inner surface of the mill body and the balls.

The experiment was repeated with the exception that 0.05% by weight of Evatriol (manufactured by EVM) and 30% by weight of sodium sulfate and 10% by weight of sodium chloride were sprayed on 5% by weight of carbon. in the form of an aqueous solution.

Evatriol consists of a mixture of (10-12 aromatic alkyl) sulfonic acids, (10-12 azanatomo alkyl sulfates) and (C 10-16 alkyl) benzenesulfonic acids.

Carbon adhesion is neither detectable on the ball surface nor on the inside wall of the mill body. The amount of grain fraction less than 70 µm in the latter case is 15 tX more than in the case of untreated coal.

Example 2

Laboratory ball milling (V = 0.35 dm ^{3 at} 1: 1; 1: 3 = carbon: ball / root ratio) showed adhesion to both the inner surface of the mill body and the balls. The amount of free-flowing grinding material was the same for milling time. decreases with the increase of the ball ratio.

The experiment was repeated with the exception that 0.1% by weight of Ufapast 62 (manufactured by Unger) and 20% by weight of sodium sulphate and 10% by weight of trisodium phosphate were sprayed on 20% by weight of carbon. in the form of an aqueous solution. No adhesion was observed.

Composition of Ufapast (C 10 -C 18 alkylbenzenesulfonic acid sodium salt.

1: 1 = carbon ball ratio (n = 16 rpm) with 15 voltsX; 1: 3 carbon balls

HU 199316 Β contains a fraction by weight of 29 with a particle size of less than 70 µm.

Example 3

In a snow power plant clock, the milling aid is sprayed on a conveyor belt with 10 parts by weight of an aqueous solution. The grinding aid is 0.07% by weight of carbon, using Ufapast 62 (manufactured by Uniger) as the grinding aid, composition: (C10-C18 alkyl) benzenesulfonic acid sodium salt.

The fraction with a particle size of less than 70 µm is 16 wt% more than untreated carbon.

Comparative Example 4

In a laboratory ball mill (V = 0.35 cm ³ , n = 16 1 / min), carbon is milled at a weight ratio of 1: 3 = carbon: ball.

The experiment was repeated with the exception that 0.07 wt% triethanolamine was sprayed on a 15 wt% aqueous solution of carbon by weight.

The fraction with a particle size of less than 0.071 mm is 8% more by weight than untreated carbon.

5. Exemplary embodiment

In a laboratory ball mill (V 0.35 cm ³ , N = 16 rpm), bauxite is milled at a weight ratio of 1: 1 bauxite to ball.

The experiment was repeated with the exception that 0.05 wt% Ufapast 62 (manufactured by Unger) (C 10 -C 18 alkyl) benzenesulfonic acid sodium salt, in the form of a 10 wt% aqueous solution, was sprayed on bauxite.

The fraction with a particle size of less than 0.071 mm is 17% more by weight than with no additive milling.

6. Exemplary embodiment

In a laboratory ball mill (V = 0.35 dm ³ , n = 16 rpm), bauxite is milled at a weight ratio of 1: 1 bauxite to ball. The milling experiment was carried out with 0.05% by weight of bauxitrone (Emmolol D) (manufactured by EVM) with the addition of a surfactant (C 10 -C 14 alkyl) sulfate. The additive is applied to the surface of the bauxite from a 10 wt% aqueous solution.

The fraction with a particle size of less than 0.071 mm was 19% more than in the case of untreated bauxite.

7. Exemplary embodiment

In a laboratory ball mill (V = 0.35 dm ³ , n = 16 1 / min), bauxite is milled at a weight ratio of 1: 1 = bauxite: ball.

The experiment was repeated with the exception that bauxit was sprayed with 0.05 wt% Evatriol (manufactured by EVM) in the form of an aqueous solution containing 10 wt% of said surfactant.

Evatriol consists of a mixture of the sodium salt of (C 10 -C 12 alkyl) sulfonic acids, (C 10 -C 12 alkyl) sulfates, and (C 10 -C 16 alkyl) benzenesulfonic acids.

The fraction with a particle size of less than 0.071 mm was 17% more by weight than with no additive clock.

8. Comparative Example

In a laboratory ball mill (V 0.35 dm ³ ; n = 16 rpm), bauxite is milled at a 1: 1 = bauxite: ball weight ratio using a grinding aid containing 0.05% by weight of triethanolamine per volatile material. Triethanolamine is sprayed from a 10 wt% aqueous solution of bauxite.

The fraction with a particle size of less than 0.071 mm was 9% more by weight than untreated bauxite.

1-3. and the results of Comparative Example 4 show that when grinding carbon using triethanolamine, 8 wt. 15-29 massX fine fraction excess is available.

5-7. The results of Examples 1 to 5 and Comparative Example 8 show that when grinding bauxite, the amount of fraction smaller than 0.071 mm using triethanolamine is 8% more by weight compared to the untreated bauxite, while using the process according to the invention, available.

Example 9

In a laboratory ball mill (V = 0.35 dm ³ , n = 16 rpm), limestone was milled at a 1: 1 limestone to ball weight ratio. The experiment was repeated except that 0.005% by weight of petroleum sulfonic acid sodium (average molecular weight: 300-600) was added to the limestone by weight.

EN 199316 in the form of an aqueous solution having a massX concentration of.

The fraction with a particle size of less than 0.071 mm is 13% more by weight than in the case of non-additive milling.

10. Exemplary embodiment

Laboratory ball mill (V =

0.35 dm ¹ ; n = 16 rpm) with barium sulfate, 1: 1 = barium sulfate: ball weight ratio.

The experiment was repeated with the exception that the hourly substance was sprayed with an aqueous solution containing 10% by weight of potassium sulphate (branded as 5%, 0.1% by weight Emulgol D (manufactured by EVM) and 0.05% by weight of potassium sulfate). for 20 liver.

The amount of needle fraction less than 0.071 mm in the latter case is 11% more by weight than in the case of non-additive milling. 25

Claims (1)

A process for intensifying the grinding of solid inorganic materials, preferably minerals, using an aqueous solution of a surfactant, characterized in that (C 10-20 alkyl) benzenesulfonic acid and / or (C 10-20 alkyl) sulfonic acid and / or (8- Sodium salt of C20 alkyl sulfate and / or C4-20 alkyl benzimidazole and / or petroleum sulfonic acid having an average molecular weight of 300-600 and optionally 1 to 50% potassium and / or sodium based on the amount of grinding aid. sulfate, chloride, or phosphate salt is sprayed onto the surface of the material to be milled in an amount of 0.001 to 1 tX in the form of an aqueous solution of 2 to 20% by weight. Example 11 In a laboratory ball mill (V = 30 0.35 dm ³ ; n = 16 rpm), dolomite was milled at a 1: 1 = dolomite: ball weight ratio. The experiment was repeated with the exception that 0.2 wt% of Pravocell FA 35 (manufactured by Buna) was sprayed in a 10 wt% aqueous solution of dolomite. Pravocell has the following composition: (C 6 -C 12 alkyl) benzimidazole sulfonic acid sodium salt. 40 The fraction with a particle size of less than 0.071 mm is 8% more by weight than in the case of non-additive milling.