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Method and equipment for washing and separating crystals

A technology of crystals and equipment, applied in the field of separation of crystals, can solve the problems of difficult to clean up viscous mother liquor, large equipment investment, and difficult separation.

Inactive Publication Date: 2011-04-06
秦贯丰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) High energy consumption;
[0004] 2) Crystal purity is not high, especially for melt crystallization with high viscosity
This is because fine grains have a large specific surface area, and the viscous mother liquor adhering to the surface of fine grains is difficult to be completely shaken off;
[0005] 3) The equipment investment is large, especially the continuous automatic centrifuge
The disadvantage is that the process is complicated, especially the separation of ice crystals and mother liquor is difficult
However, once the ice crystals can be effectively isolated, it will be a useful by-product

Method used

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  • Method and equipment for washing and separating crystals
  • Method and equipment for washing and separating crystals
  • Method and equipment for washing and separating crystals

Examples

Experimental program
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Effect test

Embodiment 1

[0094] As mentioned above, during the freeze-concentration process, part of the moisture in the solution is converted into pure ice crystal particles, and in the crystallization tank 1, a two-phase mixture composed of fine ice crystals and concentrated liquid is formed, that is, the primary ice sludge 2 . like figure 1 shown. Because the ice crystals float up, so the upper stratum ice mud in the crystallization tank has a higher crystal content. The crystallization washing column 3 is installed (or integrated) on the top of the crystallization tank 1 . Utilize the characteristic that the ice crystal floats up, supplemented by the delivery function of the pump 4. The ice mud enters the inlet 5 of the feeding mechanism located at the bottom of the crystallization washing column from the crystallization tank.

[0095] The feeding mechanism is composed of a guide tube 6, an impeller 7, a shaft seal 8, a lower sealing head 9 and a gear variable speed motor 10. Once the ice slus...

Embodiment 2

[0110] This embodiment still takes the ice crystal separation of freeze concentration as the object. like Figure 4 The crystallization washing column 3 involved in the present invention is installed (or integrated) on the upper side of the crystallization tank 1 . The primary ice slush 2 enters the feeding port 5 of the crystal washing column under the resultant force of the buoyancy and the pump 4 . When the piston 28 reciprocating up and down moves to the bottom dead center, the lower port of the crystallization washing column 3 is opened to allow primary ice mud to enter the column body. The upper surface of the piston is a stainless steel perforated plate (or screen), and the perforated plate is installed on a suitable support to form a porous and water-permeable piston. When the piston goes up, the primary ice mud is pushed into the crystal washing column. The top dead center of the piston is 1 / 4~1 / 3 of the column entering the crystal washing column.

[0111] The col...

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Abstract

The invention relates to a method for washing and separating crystals (such as ice crystals), which has low energy consumption and small investment, and ensures high purity of the crystals. The method for washing and separating the crystals comprises the following step of: carrying out mild crystallization on a washing front edge by using a melt of the crystals in a state close to the freezing point (the ice point) as washing liquid (washing water) so as to inhibit viscous fingering and tunnel effect of the washing liquid, generate a horizontal and defined washing front edge, namely piston flow, and make mother liquor in a crystal bed replaced with the washing liquid. The invention also relates to equipment for washing and separating the crystals, which is a crystallization washing columnconsisting of a vertical column body and a feeding mechanism and a cutting mechanism which are respectively arranged at both ends of the vertical column body. A mixture (crystal mush or ice slurry) of the crystals and the mother liquor is pressed into the column from one end of the column to form an isotropic crystal tight stacking bed, the mother liquor in the crystal bed is replaced with the washing liquid, and the washed pure crystals and the washing liquid are planed by the cutting mechanism at the other end of the column body so as to realize high-efficiency low energy consumption separation of the crystals and the mother liquor.

Description

technical field [0001] The invention relates to a separation method for crystallization, in particular to a method for combining crystallization with washing to separate crystals and mother liquor from magma and its equipment. Background technique [0002] Crystallization is an important means of separation and purification. In the crystallization process, non-crystalline substances (such as impurities) are excluded in the liquid phase (called mother liquor) outside the crystalline phase. and continuously concentrated in the liquid phase. When the crystallization has progressed to a certain extent, solid-liquid separation can be performed to obtain pure crystals (crystals) and concentrated non-crystalline substances (such as impurities). Centrifugal separation is a widely used method of solid-liquid separation. Its disadvantages are: [0003] 1) High energy consumption; [0004] 2) The crystal purity is not high, especially for melt crystallization with high viscosity. ...

Claims

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Application Information

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IPC IPC(8): B01D9/02
Inventor 秦贯丰廖力奋
Owner 秦贯丰
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