CS205769B1 - Flotation agent for treatment of coal minerals - Google Patents

Description

The present invention relates to a flotation agent for the treatment of coal and minerals prepared from oxyethylalcoholic products.

Flotation agents are substances with collecting and foaming effects that aid in the separation of the flotated material, e.g. coal, minerals and ores from tailings. They are superficial active substances which reduce the surface tension of water, which is enabled by the aeration of aqueous suspensions! accumulation of air bubbles on selectively carried and separated particles of the flotated material. At the same time, they often act as collectors by binding to the surface of coal or mineral particles, thereby increasing their hydrophobicity, repelling water, and improving the formation of foam of the concentrate.

The flotation agent used is, in particular, substances which are active and inexpensive, which are often produced for other purposes or which are not particularly difficult to produce. Hygienic-ecological issues are not always taken into account. Thus, frequently used agents in the past include alkylphenols, e.g. cresols, or also in combination with alcohols, which have been harmful to the handling of flotation and which heavily contaminated waste flotation waters. Hydrogenation of alkylphenols can produce highly effective non-toxic alkylhydroxyhydroaromatic reagents, and xanthogenates have also been widely used.

In addition to pure fatty alcohols or mixtures thereof, by-products from the preparation of aliphatic alcohols by hydroformylation of olefins or their processing are also very effective flotation agents. They are used to treat coal and minerals by flotation.

Propylene glycol derivatives are also described as flotation agents with collecting and foaming properties, e.g. propylene glycol monoethers, propylene glycol isopropyl and butyl ether, dipropylene glycol isopropyl ether, polypropylene glycol butyl ether, and also higher glycols such as e.g. nonylglykol. '

It has also been found that by-products of oxyethylate alcohols have very good collecting and foaming properties and can be advantageously used as flotation agents for coal and minerals.

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The flotation agent for the treatment of coal and minerals according to the invention consists of a mixture of by-products of oxyethylation of alcohols to alkyl glycol ethers, in particular. % of a mixture of polyalkyl glycol ethers and 50 to 96% by weight of the composition; mineral oil, preferably paraffin, gas, boiling oil or tar oil.

The oxyethylalcohol by-products are prepared by oxyethylation, non-catalytic, or catalytic addition of ethylene oxide to alcohols and product fractionation to the mono-, dia-triglyl alkyl ethers and distillation residue, by-products of the oxyethylalcohol.

In the case of the typiocons, the compositions contain at least 5θ of tetraglyl alkyl ethers, up to 25% of pentaglyl alkyl ethers, the remainder being higher polyglycol alkyl ethers and condensation products, and in the case of catalytic ethoxyethyletheres contain a catalyst. If it contains oxyethylated alcohol alcohol, the oxyethylated by-products may also contain glycol, di-tri- and higher glycols. By imperfect fractionation, or in the manufacture of only monoglycol alkyl ethers, the by-products also contain di- and triglyl alkyl ethers, depending on the efficiency of the fractionation.

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In addition to the conventional commercial mineral oils, the juice may be used. use * used spent mineral oils, eg * used engine oils, if they do not contain meobiocan fistotics.

The flotation agent for treating coal and grates according to the invention has many advantages over some of the reagents used so far. It has a very wide application in the treatment plant, with a high efficiency, such as shown in the examples. From the economic point of view, the production of the described flotation agent is also very advantageous, since it involves utilizing a by-product from the production of glycol ethers, which is used in this process in a complex process.

The flotation agent according to the invention is non-toxic, the agent does not pollute the bio-settling agent. logical reservoirs and watercourses. From the point of view of hygionic, the fluxing agent is prion-free, the agent has a very low tension, and almost free of dowry.

From the fire point of view, the preparation of the flotation agent is not difficult. By-products of oxyethylase alone are used, or a mixture with mineral oils is prepared with the possible addition of an emulsifier. It is preferred to prepare a reagent dosing agent by-products of oxyethylase and a mineral oil collector, each separately, directly into the flotation machine, in a ratio that is dependent on the quality of the blasted coal or pellets. dosing nozzles, a suitable ejector and the like.

The efficacy of the flotation agent according to the invention is shown in the examples, but the methods of use of the agent are not devoid of purpose.

Example 1

By-products from the catalytic oxyethylation of n-butanol were prepared by fractional distillation of the crude oxyethylation product. The mono-ethylene glycol, diethylene glycol and, in part, the tri-ethylene glycol ether were removed. The by-products of boiling point above 120 ° C / 0.26 kPa contained 2.5 phy. triethylene glycol monobutyl ether and the remainder are higher polyethylene glycol butyl ethers, or very small amounts of esters. In the by-products, there were traces of water, Q, Qhh mass, mail density djj = 1.0319 and hydroxyl value 193.5 mg KOH / g.

The by-products have been used as a flotation agent in the treatment of coking coal. The yield of the flotation concentrate was 87.9% by weight, the ash content in the concentrate, calculated on the dry matter of 15.33% by weight. and in the flotation tailings 71.28 wt.

The flotation agent has little very good efficiency in coal treatment.

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Example 2 wt. By weight of the by-products of the oxyethylation of n-butanol, the composition and the preparation as described in Example 1, 95 wt. mineral gas oil.

The prepared reagent was used in coking coal flotation, yielding a flotation concentrate of 90.8% by weight, with an ash content of 13.54% and a flotation tailings of 79.12%. > ''.

The high yield of the flotation concentrate and the ending of 'tailing' ash in the tailings indicates a very good efficiency of the reagent.

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Example 3 '

The flotation agent for coal treatment was prepared from the by-product of oxyethylation of ethanol prepared by triacionation of the crude product. Monoglycol, diglycol and triglycol ethyl ether were obtained as the main product. The by-product had a boiling point higher than 121 C / 1.33 kPa, a d d of 1 * 0528 and contained 33.1% by weight. tetraglykoletyléteru.

15.7 wt. of pentaglycol ethyl ether, 0.1 wt. % glycol, 0.13 wt. diglycol, 1.5 wt. triglycol, 0.14 $ water. The by-products were used for flotation agents:

A_B

By-products of mass. 20 15 Gas 80 spent motor oil% wt. - 85

The following flotation results were obtained

Flotation concentrate yield $ wt. 85.9 92.7

The ash content of the flotation concentrate in the dry matter. 12.67 9.63

Flot ash content. % tailings 72.16 82.16

The prepared reagents have very good efficiency in coal flotation treatment.

Claims (1)

SUBJECT OF THE INVENTION A flotation agent for the treatment of coal and minerals, characterized in that it consists of a mixture of by-products of the oxyethylation of alcohols to alkyl glycol ethers, in particular of a mixture of polyalkyl glycol ethers and 50 to 96% by weight. mineral oil, preferably paraffin, gas, spindle or deoht oil