JPH1066895A - Classification device of particle in liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate and recover coarse particles and fine particles in liquid without supplying excess liquid. SOLUTION: A horizontal flow 14 is caused in the upper part by an inflow port 1 and an outflow port 2 of liquid. A first selection chamber 4 and a second selection chamber 5 are provided on the upstream side and the downstream side in the lower part of the horizontal flow 14. A classification leg 3 receiving particles is provided successively in the lower part of the first selection chamber 4. A flow path, which is extended from the upper part of the classification leg 3 to the top and joined to the horizontal flow 14, is provided. Liquid in the second selection chamber 5 is spouted upward from a conduit pipe 10 into the flow path 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, Mg (OH) ₂ (hereinafter referred to as “water mug”) regenerated from desulfurization effluent of a flue gas desulfurization unit and CaSO ₄ .2H ₂ O (hereinafter referred to as “dihydrate gypsum”) as a by-product. The present invention relates to an apparatus for classifying particles in a liquid used for continuously separating and recovering particles.

[0002]

2. Description of the Related Art FIG. 2 shows a hydraulic classifier as a conventional apparatus for classifying particles in liquid. The undiluted solution flows in from the inflow port 01, generates a horizontal flow 014, and flows out from the outflow port 02. Both coarse particles and fine particles contained in the undiluted liquid initially settle in the sorting chamber 04, but if the flow rate of the liquid supplied from the inlet 015 at the bottom of the sorting chamber 04 is adjusted to an appropriate amount, the upward flow 011 in the sorting chamber 04
Can be made to lift only the fine particles, so that only the fine particles again flow into the horizontal flow 014.

[0003] By doing so, the fine particles are discharged from the outlet 02
Thus, the coarse particles can be independently extracted from the lower particle extraction outlet 09.

[0004]

In the conventional classifier shown in FIG. 2, both coarse particles and fine particles contained in the stock solution are settled in the sorting chamber 04, and extra particles are required to classify the fine particles and coarse particles. Water must be supplied and the amount of drainage increases. In addition, some of the fine particles settle by being entrained by the coarse particles due to physical adsorption to the surface of the coarse particles. By separating and recovering them further, the purity of the coarse particles and the recovery rate of the fine particles Needs to be improved.

An object of the present invention is to provide an apparatus for classifying submerged particles that can solve the above problems.

[0006]

According to the present invention, there is provided an apparatus for classifying particles in a liquid, comprising: an inlet and an outlet for a liquid for generating a horizontal flow of a liquid containing particles at an upper portion in the classifier; A first sorting chamber and a second sorting chamber provided on the upstream side and the downstream side of the horizontal flow below the flow, and a classifier provided below the first sorting chamber and receiving particles settled in the first sorting chamber. A leg extending upward from an upper portion of the classifying leg and joining the horizontal flow; and a means for blowing the liquid in the second sorting chamber upward into the flow channel.

In the present invention, among the particles in the liquid forming a horizontal flow from the inlet to the outlet, coarse particles having a large particle diameter settle in the first sorting chamber on the upstream side, and fine particles having a small particle diameter are deposited on the downstream side. Settles in the second sorting room on the side. The remaining fine particles flow out of the outlet together with the liquid.

[0008] The coarse particles settled in the first sorting chamber are received in a classification leg. In the channel extending above the upper part of the classification leg,
A liquid containing fine particles in the second sorting chamber is blown out, and a liquid containing coarse particles in the classification leg is fluidized by the liquid blown out from the second sorting chamber, and a part of the liquid is mixed with the flow path. It rises inside and joins a horizontal flow.

As described above, the liquid containing coarse particles in the classification leg is fluidized by the liquid blown out from the second sorting chamber into the flow path, so that the fine particles entrained in the coarse particles received in the classification leg. Is fluidized and separated from coarse particles, on which fine particles rise in the flow path and join a horizontal flow, and the same horizontal flow separation is performed as described above.

Therefore, according to the present invention, coarse particles and fine particles can be separated and recovered at a high recovery rate.

Further, since the liquid in the second sorting chamber is blown into the flow path into the flow path, no extra liquid is supplied to the separation device, and therefore, the amount of drainage increases. There is no.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. In the present embodiment, Mg (OH) ₂ (water mug) regenerated by adding Ca (OH) ₂ to desulfurization wastewater subjected to flue gas desulfurization by the magnesium hydroxide method and CaSO ₄ .2H ₂ generated as a by-product The present invention relates to an apparatus for classifying a mixed solution of O (gypsum).

The classifier is provided with an inlet 1 and an outlet 2 of a stock solution, which is a mixed slurry of a water mug and gypsum gypsum, for generating a horizontal flow 14 at the upper part thereof. A first sorting chamber 4 on the upstream side and a second sorting chamber 5 on the downstream side are provided below the horizontal flow 14 in the classification device.

Below the first sorting chamber 4, a classifying leg 3 for receiving particles settled in the sorting chamber 4 is connected. A flow path 7 constituted by a partition plate 6 and an upstream side wall of the classification device extends upward from the upper part of the classifying leg 3, and the upper end of the flow path 7 joins the horizontal flow 14 at a junction 13. It has become.

A downstream end of a water guide pipe 10 connected to the bottom of the second sorting chamber 2 and having a pump 8 is open upward in the flow path 7, and is provided in the second sorting chamber 2. The liquid in 2 is blown upward.

Reference numeral 9 denotes a particle outlet provided below the classifying leg 3, and a screw or a vibrating membrane (not shown) for fluidizing the liquid in the classifying leg 3 is provided in the classifying leg 3.
Is provided.

In this embodiment, the undiluted solution (mixed slurry of water mug and gypsum) is introduced from the inlet 1 into the horizontal flow 1
4 is generated. Before the horizontal flow 14 flows out of the outlet 2, the coarse gypsum gypsum having a large particle size is removed from the first sorting chamber 4
Then, a part of the water mug having a small particle diameter is settled in the second sorting chamber 5, and the remaining water mug flows out from the outlet 2 together with the liquid.

The coarse gypsum gypsum that has settled in the first sorting chamber 4 is received by the classifying legs 3 at the bottom of the first sorting chamber 4 and is deposited. In order to prevent compaction of the deposited gypsum, the liquid in the classifying leg 3 is fluidized by a screw or a vibrating membrane (not shown) and a liquid blown out from a water pipe 10 described later to fluidize the gypsum and remove particles. Pull out from exit 9.
By flowing the gypsum dihydrate, the water mug adhering to the surface is separated and floats near the classifying leg upper portion 12.

The fine water mug settled in the second sorting chamber 5 is blown out together with the liquid from the water pipe 10 into the flow channel 7 by using the pump 8 to generate the upward flow 11 and, as described above, the upward flow 11 The fluid containing gypsum in the classifying leg 3 is fluidized. With this ascending flow 11, the water mug floating near the classification leg upper part 12 and the water mug in the second sorting chamber 5 are conveyed to the confluence 13 and placed on the horizontal flow 14 again and extracted from the outlet 2.

As described above, in the present embodiment, the classifying leg 1
By separating the fine particles of the water mug entrained in the coarse particles of gypsum in 3 from the coarse particles and placing the fine particles again on the horizontal stream 14,
Gypsum and water mug can be efficiently separated.

Further, since the liquid in the second sorting chamber 5 is blown out to the flow path 7, no extra liquid is supplied, and the amount of drainage from the classification device does not increase.

[0022]

As described above, according to the present invention, coarse particles and fine particles can be efficiently separated without supplying an extra liquid for classification, and the purity of the recovered coarse particles can be increased. Recovery rate can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional apparatus for classifying particles in liquid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inflow 2 Outflow 3 Classification leg 4 1st sorting room 5 2nd sorting room 6 Partition plate 7 Flow path 8 Pump 9 Particle extraction outlet 10 Water pipe 11 Upflow 12 Classification leg upper part 13 Confluence point 14 Horizontal flow 15 Supply port

Claims (1)

[Claims] 1. An inflow port and an outflow port for a liquid that generates a horizontal flow of a liquid containing particles at an upper portion in a classifier, and an upstream and a downstream of the horizontal flow below the horizontal flow in the classifier. A first sorting chamber and a second sorting chamber, a classifying leg that is provided below the first sorting room and receives particles settled in the first sorting room, and extends upward from an upper portion of the classifying leg to form the horizontal flow. An apparatus for classifying particles in a liquid, comprising: a flow path for merging; and means for blowing liquid in the second sorting chamber upward into the flow path.