DD200036A1 - PROCESS FOR THE BERGMAENNIC GAINING OF CARNALLITITE - Google Patents

Abstract

The invention relates to the minnainic extraction of carnallitite by recovering storage stocks bound in the mining columns. The object of the invention is to avoid the economic losses caused by leaving the dismantling pillars standing. The object of the invention is to completely recover the decomposition pillars in a second phase of degradation, without causing a sudden breakage of larger rock volumes by overburdening the sproed-fracture-sensitive carnallite with the release of energy. The technical object of the invention is achieved by introducing into the cavities of the first degradation phase a sputtering offset, and that the composition of the spülfluessigkeit is adjusted so that there is a gradual decomposition of the carnallite present in the pillars. The filling of the primary cavities in connection with the elimination of the susceptibility of the carnallite of the primary pillars to decomposition and the decomposition of the parasite, makes possible, in their combined action, a subsequent extraction of the decomposition pillars.

Description

Title of the invention

Process for the mining of carnallitite

/ ~ Y Field of application of the invention

The invention relates to the mining of carnallitite by recovering deposit stocks bound in mining pillars and avoiding mining losses.

Characteristic of the Known Technical Solutions In mining mining of carnallitite deposits is compared to other salt deposits such as sylvite, hard salt or rock salt, the peculiarity that the winning salt rock is able to accumulate large amounts of energy, which can form high-voltage zones in degradation pillars and Baufeldrändern. v_y If these tensions reach a certain limit, the brittle fracture of mountain volumes of different sizes occurs with the sudden release of energy.

This process, referred to as a mountain attack, can be used for

complete or overwhelming destruction of large quantities and seismic shocks of the day. surface. * · "'·

The current state of solution to this problem is characterized in that it is possible on the basis of mature theoretical principles to dimension the AbbaLipfeiler so that the resulting

Stress concentrations are sufficiently far away from the critical boundary. An additional measure is to leave a largely unerritzten Baustreifentrennpfeiler between two construction tires, in order to prevent the spread of any brittle fracture on the neighboring construction strips. With these measures, the mining of Garnallititlagerstätten is dominated by geomechanics, but high deposit losses occur in the .Abbaupfeilern and Baustreifentrennpfeilern. The

/ J ₀ level of degradation losses is substantially dependent on the depth, the deposit thickness and the Carnallitgehalt the pillar and will continue to grow with the progress of degradation development "The ability to eliminate the Sprödbruchempfindlichkeit carnallitischer pillar characterized in that the pillar unsaturated with a MgGIp liquid is soaked A practical exploitation of this idea has so far failed because it leads to a considerable reduction in the carrying capacity of the decomposed pillar and thus to an increase in the concentration of stress in neighboring, not yet decomposed demolition pillars or Baufelärändern comes. While eliminating the risk of brittle fracture for the treated pillar, it is initially increasing for the construction field as a whole. "The use of the backfill backfilling method is well known and has been widely used for hard salt deposits." There has always been a demand for rinse liquid composition provided that a

To solve the problem of decomposition of the piers. conclude "For hard salt or SyIvinitpfeiler saturation of the rinsing liquid to potassium chloride and sodium chloride is required, which can be realized without difficulty.

For the application of the Spülversatzverfahrens in carnallitite deposits is the basic idea, by

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The use of a MgCl ^ -saturated rinsing liquid also, if the decomposition of the pillar to avoid · A practical application of the method has not yet been done, since the achievement and constant maintenance of the required high MgClp content. The operation of special evaporation plants and thus a would require high energy consumption ·

Utilization of the flushing offset for the secondary reduction of the degradation losses is achieved by the chamber pillar rebuilding. However, this procedure has so far only been

for Haxtsalzgrubenfeider applied, in which a Langkammerbau with a certain minimum width of the pillar '). , had been carried out. Since these prerequisites were only given in a few cases, the process has so far only acquired local significance. Ideas for the extension of this method on carnallitite deposits do not exist so far.

OBJECT OF THE INVENTION The object of the invention is to avoid the economic losses caused by leaving the demolition pillars standing.

The invention is based on the object, the dismantling

in a second phase of degradation to win completely, without that _N 25 ^{it is} due to overuse of brittle fracture ^y lent carnallitite to a sudden break larger rock volumes with release of energy.

Presentation of the ivesens of the invention

3 ₀ . It has been found that the object of the invention thereby. , , ... solved; is introduced when the primary excavation cavities of a carnallite deposit are flushed. In contrast to previous ideas, to choose the composition of the rinsing liquid so that a pillar decomposition is avoided, according to the invention is a pillar decomposition as an integral part of

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However, a practical application of the method is "not yet done, since the achievement and constant maintenance of the required high MgClc content requires the operation of special evaporation plants and thus a high energy demand would.

A utilization of the flushing offset for the secondary reduction of the mining losses is achieved by the Kammerpfeilerrückbau · However, this method has been used only for Hartsalzgrampffeider, where a Langkammerbau was performed with a certain minimum width of the pillars. Since these conditions were only met in a few cases, the method has so far only gained local significance. Ideas for extending this method to carnallitite deposits have not hitherto existed.

- Object of the invention

The aim of the invention is to avoid the economic losses caused by leaving the demolition pillars standing.

The invention has for its object to win the dismantling in a second stage of degradation completely without es.dabei by tjberbeanspruchung the brittle fracture-sensitive Carnallitits comes to a sudden break larger mountain volumes with release of energy.

SUMMARY OF THE INVENTION It has been found that the object of the invention is achieved by introducing a flushing offset into the primary degradation cavities of a carnallite deposit. In contrast to previous ideas, the composition of the drilling fluid should be selected that pesticidal decomposition is avoided according to the invention is a pillar decomposition as an essential component of the invention

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Process intended · The decomposition of carnallite in the pillar should be achieved by:

a) a MgCl ^ -unsaturated flushing liquid is used

b) the offset introduction is controlled so that the liquid remains relatively long in the rinse field

c) the contact between rinsing fluid and carnallite in the pillar is improved, if necessary, by a previous perforation of the pillars with boreholes.

Due to the intensive and long-term contact of the unsaturated liquid with the carnallite, a considerable part of the carnallite is decomposed. The chloride calcium contained in the caxnallite is decomposed as KCl.

As the result of the decomposition, the compact carnallitite pier becomes a segregating residue with considerable pore volume, which is partly filled with rinsing liquid and partly with air. For example, in a carnallite with 6o % Carnallitanteil and a decomposition of this Carnallits to 7o % a decomposition residue is achieved, which has a pore volume of 31%, and is no longer susceptible to brittle fracture.

The decomposition of the carnallite in the pillar also significantly reduces the stability of the pillar. However, since the adjacent excavation cavities have already been filled with offset before and during the pillar decomposition, it still can not lead to a pillar decomposition.

o ₀ .störung come, but the hanging wall descends gradually to the offset and the decomposed pillars ab.-It ^:: '· both porous body are gradually compressed. The '.' same compensation for the reduced bearing capacity of the piers due to the immediately adjacent offset

oc forms an integral part of the invention. At the end of. Offset phase is a pit field available, the

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in the area of the former excavation with offset, in the area of the former pillars is filled with decomposition residue of carnallitite, wherein in the latter the recyclable material KCl is contained in the enriched state. Both bodies represent a contiguous mountain massif with a certain pore volume. The pore volume will be fulfilled to a considerable extent with rinsing liquid or with a solution which is significantly higher in MgCl ₂ due to the decomposition which has taken place.

Such a filled minefield can be recovered in a secondary mining phase, without. fundamental problems of geomechanical control arise. First, a stretch must be driven in the deepest part of the construction field and thus an outflow of still existing liquid in the construction field be initiated. After a sufficient JTüssigkeitsabzug is done, the actual pillar back building can be done. It inevitably must be discussed the already introduced Y replacement, which has sufficient stability after reaching dehydration. The offset material can be tilted in excavation cavities of secondary extraction in the same construction field. In mining, this procedure can be used for the following tasks.

Gewinn 25 Obtaining the stocks of stocks held in the pillars already excavated. The achievement ge. Ringer's mining losses in newly abandoned construction sites. When retrofitting the current Baustreif entrennpf eiler, after both sides of the Baustreifen-. 3o -'-. a pillar .. a-pillar back is done .. For, the. ; .. Creation of artificial Baustreifentrennprofil by the offset of certain Abbaustreifen and thus for the geomechanical parceling of the pit field.

, The invention will be explained in more detail in the following embodiment and with reference to the attached drawings.

6 -

embodiment

In an excavation field excavated in the Kuxzpfeilerortbau with stable piers flushing offset is introduced, wherein an MgGIp unsaturated rinsing liquid 2 used and accumulated on the offset solid 1. Due to the intensive, through holes 4 in the pillar, even more contact between the liquid 2 and the pillar 3, the carnallite in the pillar is first decomposed in the lower pillar area 5. As the dispensing progresses, the area of damming of rinsing liquid and, thus, the pillar decomposition gradually shifts upward.

(Pig) 1

After completion of the rinsing the construction field consists of largely decomposed pillar material 5> which is surrounded on all sides by Yersatzmassiv 1. Lufterfüllte cavities 6 above the offset surface are initially present in a small extent, but are gradually closed by the lowering of the hanging wall (Fig. 2) In the Wiederwwältigung a stretch 7 is first driven in the lowest part of the excavation field, with the introduced offset 1 and the decomposed pillars 5 are discussed. This route is initially used to drain liquid from the offset masses After sufficient drainage is achieved, excavation sections 8 are raised and driven by this Querörter 9 in the pillars. The accumulated in the discussion of the offset mass heap is tilted as a secondary offset 1o in these cross-words. (Fig. 3)

Claims (1)

23 132 8 4 invention claim 1. A process for the mining of carnallite, which is bound in the degradation pillars, characterized in that, simultaneously with the introduction of the ^ offset, a pillar decomposition by the MgGIp unsaturated rinsing liquid takes place, wherein the iu tertstoff EGl enriched in the pillar and subsequently recovered in a pillar reconstruction phase. / j- ₀ 2 «Process for the mining mining of carnallite according to item 1, characterized in that a back of the pillar also takes place in already dismantled hotlines and by creating staggered construction tires a subsequent geomechanical parceling of the pit field is made possible · For this <and pages Zeldinungen 231328 4 invention claim A process for the mining of carnallite, which is bound in the degradation pillars, characterized in that, simultaneously with the introduction of the offset, a pillar decomposition by the MgCIp unsaturated rinsing liquid takes place, the valuable substance XCl enriched in the pillar and subsequently recovered in a pillar reconstruction phase. / J ₀ 2, method for miner mining of carnallite according to item 1, characterized in that a pillar back-building even in already excavated field parts er- 'follows and by creating staggered construction tires subsequent geomechanical parceling of the pit field is made possible. For this. ^ ..... pages drawings