DE743287C - Process for the extraction of pure coal with the lowest ash content by processing pretreated low-ash coal by means of foam flotation - Google Patents

Description

Process for obtaining rhyme coal with the lowest ash content by processing of already pretreated low-ash coal by means of foam flotation The The invention relates to a method for the extraction of coal that is particularly low in ash, like .sie for various industrial purposes, in particular as a raw material for the manufacture of electrodes to supplement and replace domestic pitch coke or foreign petroleum coke is required in ever increasing amounts. The preparation olfactory Efforts to increase the ash content of the coal only for these purposes at best The maximum permissible level of 0.6% has so far been a complete success not led. In front, differentiate the usual ones as not applicable for this purpose Processing methods from what the coal is called: without taking into account the different, bound ash content of their structural constituents is processed because, such Proceed even in the best case and accepting a very low output only to ashes; -; keep from several hundred lead while the maximum allowable Ash content for such pure coal for the above purposes is significantly lower must lie. It is therefore necessary to carry out the preparation according to carbon petroleum To make points of view, d. H. in front the structural components of the coal are those to switch off, which already have a much higher bound ash content, namely the secondary epigenetic mineral, mostly pebbles and calcite, containing Fusit (fiber charcoal) and the secondary syngeneic clay: containing Durit (matt coal), in order to: one accretion of the remaining, predominantly only Vitrite-Clarit-components containing primary plant ash (shiny hairs). For Various processing methods have already been proposed for this purpose, like the application of the elastic blow for the purpose of breaking up the coal into their structural components, the processing of heavy liquids and certain in coal petrographic Relationship type-wise acting foam flotation process. All of these procedures but do not allow the enrichment of vitrite and clarite to be high enough drive and thus a Reninstkohle with the desired low ash content achieve.

The coal petrographic processing by elastic impact K. Lehmann and E. Ho f m a n n did indeed lead to a certain enrichment of certain Coal structure; component parts, but without the usual ones in coal processing Ash content of q. to be less than 6%.

The use of swimming and sink separation by means of specifically heavy solutions for the purpose of extracting pure coal also did not achieve the goal. By working with calcium chloride solution, an output of only 3o to 5o% pure coal with a maximum of 0.7 to 0.8% ash can be achieved.

The carbon petrographically acting foam float treatment is finally based on the fact that by using certain additional floating saddles certain carbon structure constituents pressed while others made to float up will.

One of these processes makes chlorinated dextrins for pressing In the front, gloss and matt charcoal is used and the fiber charcoal is made from low-boiling wood tar oils initially foamed separately. However, there in the rest of the coal luster and matt coal remain combined with ash contents between 5 and g%, is pure coal on this Whites cannot be won.

According to another method belonging to this genus, for pressing bright and matt carbon aliphatic or aromatic hydrocarbon compounds with several terminal, water-affine groups, such as hydroquinone, gallic acid, Tannic acid, dichlorobenzene, and humic acid, may be used, with a more selective one Effect against fiber charcoal regardless of the Georgian age of the charcoal should be. This process also does not lead to the extraction of coal in an economical manner possibly.

This is just as impossible with a further known method., after which by using protective colloids such as starch, tannin, or albumin Glue that is to be pressed carbon fiber. This process is also extraordinary sensitive and very solid in terms of its effect. come.

It has also been proposed to purify high-purity carbon simply by means of foam flotation to win. According to the known method, raw coal should initially be reduced to 2 to 5% or even more ashes are pretreated and then melted. Here should Disposals from all enrichment levels immediately when they arise from the work process be led out. Despite these measures, there is apparently only one unsatisfactory processing success achieved, estimated 5o% output with o. 8% ash, based on the pre-loading stage as feed coal, because in the Practice this process only with subsequent acid treatment of the foam concentrate works to get a purest coal with less than 0.5% ash. Under a certain limit in ash content would float, as in the description means being uneconomical, especially since there is no further reduction in the ash content results.

In contrast to all known methods, the invention creates the Possibility to use pure coal in an economically and technically perfect way Rit under 0.6% ash to produce. The new method is that, a by pretreatment according to a known, carbon petrographically separating; in physical Regarding the process obtained, however, which differs from the foam swimming treatment enriched with Vitrit Clarit: and from contaminating components such as fire slate, Durit and Fusit, exempted noble coal with only 1 to 1.5% ash content afterwards is subjected to the usual foam swimming treatment, in which the vitrite-claryte components as the most pure coal without the use of additional floating resources other than collectors or foamer -be made to float.

The precious coal obtained in this way in the pretreatment stage In contrast to the method of operation of the last-mentioned pre-canned procedure, swim without having to take any special measures, d. H. so that the outlets only leave the Schaurnschwimmaufentungsanlage at one point and that of the Intermediate stages run out again; where you can only add Collector and Schäiun.eröl gets along without, -as with the known processes, coal petrographic Having to use sort-wise acting substances, because according to the invention the Focus on the coal petrographic separation i in the pre-treatment stage is placed.

: '11s procedure whose application for the Pre-treatment stage When it comes to consideration, all those are eligible, by means of which a sufficiently carbon petrographic Pre-enrichment is possible, which leads to a noble coal of about i, 5%. Ash -leads, for example heavy liquid treatment, as well as cascadin gutter washing for fine grain or electrostatic processing for small grain.

Some embodiments of the new method are shown below given and at the same time the fundamental difference between the known, the purest coal extraction only by means of the Schaurnsichwimmaufverarbeitung clarified compared to aspiring procedures.

The following three types of coal, from which three samples each with different ash contents were produced, were used as starting coals for these tests: Ash content in 0 / " i 2 3 I. Carl-Funke-Anthracite NuB V. ... . . . . . . . 1.35 2.25 3.9 II. Heinrich Robert gas coal seam Clemens .. 1.15 2.0 3.0 III. Hannibal fine charcoal. ... ... . . . . .... 1.25 1.9 2.65 Accordingly, the samples of the first series of tests only lead to ash contents between 1 and 1.5%, so they represent carbon petrographically largely pretreated carbon from which, according to the patent claim, carbon black is assumed for the foam swimming treatment. Instead, the task leads well to the second series of experiments about 2% ash, that to the third series of experiments between 2.5 and 4% ash in the sense of the canned procedure, in which the starting material for the foam swimming preparation ash content between. 2 to 50/6.

For all three coal names, the foam swimming preparation tests were now carried out hex of the first series of tests based on the simple foam floating treatment process carried out. In all experiments, this was consistently used as a Collector and foamer acting stone colil tar oil P4 applied. Other flotation devices were not added.

Finally, in all cases, parallel tests were carried out with different digestion purity, namely a) in the normal grain size of coal sludge for foam swimming preparation below 0.5 mm, b) after extensive grinding on the number table no test results obtained for anthracite (I). Number table -i Test series i anthracite Ash- vitrite- fire- sur- product bring Retention Clarit Durit Fusit schiefer Berge search 0/0 0/0 0 / 0th 0/0 0/0 0/ 0 0/0 I task ..................... 1.35 90.7 2.2 6.2 o.5 0.4 Concentrate .................. 71.2 0.55 96, o 1.5 2.5 - - 2 Exercise ..... ... .... ... .. .... 2.25 85.2 4.6 8.2 1.2 o.8 Total 77.7 I, 1 86, o 7.8 5.0 o, 8 0.4 Partial concentrate ....... t 26o o, 9 9o, o 4.1 5.4 0.3 0.2 3 Task ..................... 3; 9 83.2 3.8 7.9 4.1 1.0 Total- l 78.7 1; 6 84.0 f concentrate ....... 5.5 9.0 ° f 0.7 Part- 27.5 1.2 87.1 4.3 7.5 0.7 0.4 When working according to the new method, the Schawmschwimmauf treatment achieves a high purity coal with 0.55% ash at 71% output. Vitrite-Clarit is enriched in the concentrate to -96%, which only contains 1.5% Durit, 2.5% Fusit and no more impurities in the form of fire slate and mountains.

If, on the other hand, the known method is used, then at 78% yield achieved in test series 2: 1.1% ash in the foam concentrate with 2.25% ash in the task, with test series 3: 1.60 l0 ash in the foam concentrate at -3.90, r0 ash in the task. So this result is totally inadequate.

The structural composition of only about 840ö Vitrite-Clarit, 40116 Durit, 8 0 (o Fusit, 3 0'o fire slate, i 0'o mountains on average shows that the foam swimming treatment produced no further vitrite-clarite enrichment. If so, so do the impurities could be reduced to 1.5% in the foam concentrate, it amounts to Content of Durit and Fusit still together at about 140; 'o.

To see now, up to what ash content you get with the well-known If the method can swim down, the foam concentrate was used in test series 2 and 3 further restricted by frequent re-foaming. However, one of them did not succeed only removes such low-ash pure baldness as it was in test series i after the process could be produced according to the invention. The attempts were canceled when it turned out that with only 26 to 280; ö spreading only ash contents of o.9% in case and 1.20'o in case 3 were reached. The carbon petrographic structure composition this foam concentrate has improved only a little. Apart from that, still Much too high ash content with i 0'o, the spreading is now completely inadequate become.

The situation for the experiments with gas coal (II), which is dealt with in number table No. 2, is very similar. When working in accordance with the present process, the foam flotation treatment achieves a pure coal with 0.450% ash at 710% output. The Vitrite-Clarit enrichment is 940! O.

If a known method is used, pure carbon is only to be obtained by the foam swimming process, according to series of experiments 2,760, 'o Application with 0.850'o ash in the foam concentrate with 20'o ash in the feed material, in test series 3 58% yield with 1% ash in foam concentrate at 3t! `0 ash in the feed item.

Here, too, the ash content is far too high for the purest coal, which in turn is due to the unfavorable structural composition in the feed material from im Medium 87.50'o Vitrite-Clarit, 7.50'o Durit-Fusit, 5, ooto impurities. Consequently In these two experiments, only a Vitrite-Clarit enrichment of 90% was achieved.

If the foam concentrate was reduced further here, it was a noticeable reduction in ash can still be recorded, to 0.8% im Case 3 and to 0.55% in Case 2, but with only a slight output of about 20%. This spreading makes the practical use of this method of operation impossible.

When looking at the fatty charcoal (III in number table 3) the same we can be seen. kung. Even if the result here for the new process is not as good as with the two other types of coal, because only 67% yield was achieved with only 0.70; ö ash. According to the coal petrographic analysis, this is due to the fact that Durit and Fusit got more strongly into the concentrate. This rare case is conceivable with a special nature of these structural components, namely when the Durit contains a lot of vegetable bitumen and thus contributes to it. too low carbonization would be specifically easy and the fusite is not soaked in bitumen, but rather hollow-pored, which both applies here. As a result, only a Vitrite-Clarit enrichment of about 900 ° is achieved. ° number table 3 Test series III fatty coal Ash- vitrite- fire- sur- product bring content Clarit Durit Fusit schiefer Berge search %%%%%%% = Task .............. ° ....... 1.25 89.6 4.3 5.4 0.3 0.4 Concentrate .................. 67, o 0.7 89.4 5.4 4.7 0.5 o, e.g. 2 task ......... ........ .... 1.9 79.9 7.5 10.7 0.3 I: 6 l ...... .63.4 0.85 85.0 9.2 4.4 0.5 o.9 Total concentrate Part- J. I7 3 0.7 3 Task ..................... 2.65 81.7 6.4 8.7 1.2 2.0 Total- .. 67.5 1.05 8o.2 I2.0 5.3 1.5 1.0 Partial concentrate ..... 23.6 0.9 - - - - - If this charcoal is treated according to the known method by floating the material in stages or cells, while removing the mountains from each cell or group of cells, the ash content rises from 6.5% in the foam concentrate to o; 8 5% in case 2 and I, o5% in case 3. Only when there is severe constriction due to frequent re-foaming does it succeed; Lowering the ash content to between 0.7 and 0.9%, however, mixes the economically impossible yield of only 20% on average.

Claims (1)

PATENT CLAIM: A process for the extraction of low-ash rhyme coal by processing already pretreated low-ash coal by means of foam swimming preparation, characterized in that a process obtained by means of varietal treatment according to a known carbon petrographically separating, but physically different from foam swimming preparation, enriched in Vitrit-Clarit and contaminated Components such as fire slate, Durit and Fusit, liberated noble coal with only 1.5 to 1.5% ash content is then subjected to the usual foam swimming treatment, in which the Vitrit-Clarit components are made to float as low-ash rhyme coal without the use of additional floating means except collectors or foamer will. To distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: .deutsche. Patent specifications .... No: 65ö 03 i, 668720.