EP1033170A2 - Process and apparatus for reclaiming fine sand from a floating mining machine - Google Patents

Abstract

The excavated material has the water extracted and is then brought by floating conveying belts onto land. A blind base is installed beneath the draining screen of a screening machine to collect up the mixture of water and fine sand which is then ejected in the delivery direction and taken up in a wash trough forming the separating bed of a hydro-belt separator. Independent claim describes device with draining screen and blind base (5) covering entire surface beneath draining cover (4). An ejector (8) leads to a hydro-belt separator (9) which comprises an endless conveyor belt (10) with wash trough (11) and rising part (12) leading away from same.

Description

The invention relates to a method for recovering fine sand from a mining device as a floating grab or floating Bucket chain excavator, the excavated material being drained and over floating conveyor belts is brought ashore.

The invention further relates to a device for performing the Process in which the dredged material is a dewatering screen machine transferable with downstream material conveyor and swimming belt is, wherein the screening machine is a drainage deck with a Has drainage covering.

With such floating extraction devices e.g. in form of Bucket chain excavator or a floating grab is gravel underneath Water won and mostly on floating conveyor belts Brought country. So that the gravel material can be transported on a conveyor belt, it needs to be drained. With the floating grab and floating Bucket chain excavators usually do this with a horizontal drainage screen. The installation of this drainage screen is like this chosen that for the floating gripper as little lifting height as possible and used as little head as possible for the bucket chain will, i.e. the drainage screen must be built as low as possible become. The dewatered material in this way is removed from the dewatering screen hand over a chute to the outgoing conveyor belt.

During the drainage process - due to the drainage slots - lost fine sand with the water. This fine sand goes back to the quarry pond. The fine sand can also be recovered become. This is done due to the prescribed installation of the drainage sieve to collect this draining Materials a sieve pan that is equipped with a pump and that Pumps material for recovery into a cyclone. The cyclone can optionally with little sand on the same dewatering machine or if there is a lot of fine sand loss, hand it over to a second sieve for transport on the conveyor belts.

The main disadvantage of this e.g. by DE-GM 75 41 007 known method is that increased energy consumption through the solids pump to use the sand-water mixture to bring the necessary pressure into the cyclones. The device shows high mechanical wear, is heavy, which has a negative effect on the floating unit and requires high investment costs.

The invention has for its object a method or a To design the device of the type mentioned in such a way that the energy requirement is significantly reduced and the device a small Has weight and low wear costs.

According to the invention, this object is achieved by the method that under the drainage screen of a screening machine a blind floor installed, which collects the water-fine sand mixture, in Conveying direction and a washing trough as a separating bed Hydro belt separator gives up.

According to a device according to the invention, the task continues solved in that the screening machine under the drainage deck has a blind floor covering the entire surface, whereby in the conveying direction the end area is provided with a discharge that the discharge is directed to a hydraulic belt separator consisting of a revolving endless conveyor belt with a washing trough as Separating bed and a rising one leading away from the washing trough Part, with the direction of travel of the conveyor belt in the direction of the rise takes place and that the dredged material at the discharge of the screening machine Washing tray of the hydraulic belt separator is passed.

An advantageous embodiment is that the drainage deck is designed as a classifying deck. This makes it possible the complete sand fraction e.g. 0.2 mm separate and on the floating dredger the fine sand and organic parts cut off.

It is also proposed that below the rising part of the conveyor belt a drainage screen is arranged.

It is also advantageous that one of the drainage sieve Return line to the hydraulic belt separator runs.

Finally, it is suggested that against practicing on the separation bed a filter is arranged.

The invention is described in the following description with reference to in the exemplary embodiments illustrated in the drawings.

Fig. 1

eine erste Ausführungsform der erfindungsgemäßen Vorrichtung im Aufriß mit einem Eimerkettenbagger als Gewinnungsgerät,

Fig. 2

einen Grundriß von Fig. 1,

Fig. 3

eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung im Aufriß mit einem Schwimmgreifer als Gewinnungsgerät und

Fig. 4

einen Grundriß von Fig. 3.

Show it,

Fig. 1

a first embodiment of the device according to the invention in elevation with a bucket chain excavator as a mining device,

Fig. 2

a plan of Fig. 1,

Fig. 3

a second embodiment of the device according to the invention in elevation with a floating grab as the extraction device and

Fig. 4

a floor plan of Fig. 3rd

In the floating system shown in FIGS. 1 and 2 with A bucket chain excavator 22 is located on a floating body 19 a trestle frame 26 on which the bucket chain excavator 22 is arranged. There is a below the discharge of the bucket chain excavator 22 Horizontal screening machine 1 with a first upper deck 21 and one drainage deck 4 arranged below that with a drainage covering is provided. Located below the drainage deck 4 a blind floor 5, which extends over the entire width and length of the Screening machine 1 extends. The screening machine 1 has a motor 23 provided that a promotion of the drainage deck 4 Material in the conveying direction 6 causes. At the front of the Blind bottom 5 is a discharge opening 8, but instead such a discharge 8 also arranged small chutes on both sides could be.

Below the blind base 5 of the screening machine 1 is a Hydro belt separator 9, i.e. a known device for Washing out and sorting of organic, loamy and other Impurities from continuously supplied coarse and fine-grained Solids as described in DE 38 39 666 C1. This Device is modified so that an endless conveyor belt 10 runs over two deflection rollers 18 and the belt in the rest at different Support rollers 24 is supported. The top of this conveyor belt is arranged in such a way that starting from the middle to the right a washing trough 11 is formed as a separating bed with a Overflow 16 for the finest material and in the opposite direction there is a rising part 12 with one at the end Fine sand discharge 20, with the conveyor belt 10 in the direction of arrow 13 is driven.

The material either arrives via the fine sand discharge 20 Drainage screen 14 or directly on a material conveyor 2 and then a swimming band 3. In case of using a such additional drainage sieve 14 is one Return line 15 with the separating bed 11 of the hydraulic belt separator 9 connected.

In terms of process technology, the installed blind base 5 causes collecting of the water-fine sand mixture, which via this blind floor 5 to Output 8 is carried. This is the drive of the screening machine 1 for transporting the material for transfer to the hydraulic belt separator 9 used. This ensures that a low overall height can be maintained and the sand-water mixture collected high is and thus allowed a downstream drying and Install drainage system. It is important with such floating systems that all superstructures are kept light in weight can be and also adapt to the swimming heel have to. The hydraulic belt separator 9 classifies the water-sand mixture Sharp, with 16 drainage pipes running back into the lake at the overflow. The recyclable fine sand is discharged to the front and on hand over the conveying conveyor belt 2 or if there is more Fine sand over the drainage sieve 14.

This described embodiment can be made even smaller Modifications are modified. For example, in which the Drainage deck 4 is designed as a classifying deck and the system so that it can be used for sand preparation. Furthermore can a ball filter 17 can be arranged in the region of the separating bed 11, as described in the earlier patent application 197 38 674.1.

The embodiment of such described in FIGS. 3 and 4 floating system differs from the embodiment 1 and 2 only by the arrangement of a floating gripper 25 as a extraction device, wherein between the gripper 25 and a funnel 27 with coarse grate is arranged in the screening machine 1.

Claims (6)

Process for recovering fine sand from a floating Extraction device as a floating grab or floating Bucket chain excavator, whereby the excavated material drains and is brought ashore via floating conveyor belts, characterized in that under the drainage sieve one A blind soil is installed, which contains the water-fine sand mixture collects, discharges in the direction of conveyance and one Gives up the washing trough as a separating bed for a hydro belt separator. Device for carrying out the method according to claim 1, where the dredged material from a dewatering screen machine (1) with downstream material conveyor (2) and swimming belt (3) can be transferred, the screening machine (1) being a drainage deck (4) with a drainage covering, characterized in that that the screening machine (1) under the drainage deck (4) a blind floor covering the entire surface (5), the end region (7) having in the conveying direction (6) a discharge (8) is provided that the discharge (8) to a Hydro belt separator (9) is directed, consisting of a rotating endless conveyor belt (10) with a washing trough (11) as a separating bed and one leading away from the washing trough (11) rising part (12), the running direction (13) of the conveyor belt (10) in the direction of the increase and that the dredged material at the discharge (8) of the screening machine (1) of the washing trough (11) the hydraulic belt separator (9) is transferred. Apparatus according to claim 2, characterized in that the Drainage deck (4) is designed as a classifying deck. Device according to claim 2 or 3, characterized in that that below the rising part (12) of the conveyor belt (10) a drainage screen (14) is arranged. Apparatus according to claim 4, characterized in that from the drainage screen (14) a return line (15) to Hydro belt separator (9) runs. Device according to one of claims 2 to 5, characterized in that that against the overflow (16) of the separating bed (11) Filter (17) is arranged.

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