CN2690370Y

CN2690370Y - Treating system for salt water fine production

Info

Publication number: CN2690370Y
Application number: CNU200420024823XU
Authority: CN
Inventors: 薛松
Original assignee: KAIMO FILTRATION TECHNOLOGY SH
Current assignee: KAIMO FILTRATION TECHNOLOGY SH
Priority date: 2004-02-18
Filing date: 2004-02-18
Publication date: 2005-04-06
Anticipated expiration: 2014-02-18

Abstract

The utility model relates to salt water refining equipment in chlorine-alkali industry, comprising a preprocessor, a reactor before filter, a membrane filter and a filtering refined salt water storage tank which are interconnected orderly through pipelines. The upper part in the shell body of the reactor before filter is provided with a mixing chamber; a crude salt water inlet and a Na 2 CO3 inlet are arranged on the mixing chamber; a mixing shaft is arranged in the axial direction of the mixing chamber; the portion of a central axle at the lower part of the mixing chamber is provided with an outlet; a conical fluid guider is arranged in a shell body at the lower part of the mixing chamber; a funnel is arranged below the conical fluid guider; and the bottom of the funnel is connected with an outlet pipe, the highest point of which is lower than the horizon where the crude salt water inlet is positioned. The membrane filter is a Skyworth pipe-typed membrane filter, which can realize non pump type self-flow filtering and adapt large-scale production with a 15-20 ton handling capacity in one year. The power consumption is reduced, the energy is saved and the crystal structure such as CaCO3 can not be destroyed.

Description

The treatment system of salt refining

Technical field

The utility model relates to chlorine industry salt refining equipment.

Background technology

Present domestic not precoating of employing membrane type static filtering system is to the chlorine industry brine rectification process, and step is:

1, raw material salt etc. with backflow salt solution, replenish clear water contact lysis sodium-chlor and be state of saturation, the various impurity in crude salt and the salinated water also enter in the crude brine simultaneously, the impurity of leading ion state has C _a ⁺⁺, M _g ⁺⁺, Al ⁺⁺⁺, Ni ⁺⁺Deng and organism and water-insoluble, these impurity must be removed.

2, generate solid particulate by adding the metal ion that NaOH makes Mg etc. can generate insoluble oxyhydroxide, this is reflected in first reactive tank and carries out, and adds NaClO in groove, and organism is carried out oxychlorination, make finally that PH is 10.5-12 in the crude brine, NaClO is 1-10PPM.

3, a large amount of Mg (OH) will be arranged ₂The suspension of suspended particle carries out solid-liquid separation in pretreater.

4, the ladder type mud scum receiving device by pretreater enters second reactor with the salt solution of coarse filtration, and promptly reactor before the filter drops into Na in second reactor ₂CO ₃Generate insoluble and metal ion carbonate indissoluble, promptly generate suspended solid, make in the final crude brine to contain Na ₂CO ₃Be the 0.2-0.4 grams per liter.

5, by the membrane filter filtration resistance about 0.04-0.4Mpa, so should adopt greater than the pump of this resistance the crude brine of the solid-liquid suspension in second reactor is pressed into membrane filter, general pumping pressure flows into clarified brine storage tank through filtering rough salt solution by pipeline greater than about 0.15-0.3Mpa.

The weak point of above-mentioned technology:

1, the CaCO that in second reactor, forms ₃Particle can be broken under the high speed rotating of pump, and filtration resistance is increased, because this process does not add flocculation agent, therefore makes Na ₂CO ₃Crystalline particle is smashed very unfortunate.

2, because the resistance of film filter at 0.04-0.4Mpa, can't be realized gravity flow, must be with being pumped into strainer.

3, the structure of reactor does not fully allow brilliant to grow up, because Na not by the crystallography principle design before the filter ₂CO ₃The excessive 0.2-0.4 grams per liter that is controlled at, the part metals ionic reaction is incomplete, the content overproof of some metal ions in the refined brine.

4, the excessive control of the NaOH PH numerical value in first reactive tank is 12, and alkaline height can cause the oxyhydroxide dissolving of some two property metals.

Summary of the invention

The utility model purpose be to design a kind of need not to force by pump filter, reduce power-equipment, and can realize the treatment system of the salt refining of better filter effect.

The utility model comprises pretreater, the preceding reactor of filter, membrane filter, filtration clarified brine storage tank, interconnect successively with pipeline between above-mentioned each device, the intravital top of the shell of reactor is provided with the teeter column before described filter, and establishes crude brine import and Na in the teeter column ₂CO ₃Import, the axial arranged stir shaft in the teeter column sets out mouth at the axis place of bottom, teeter column; Arrange conical deflector in the housing below the teeter column, in the arranged beneath funnel of conical deflector, the bottom of funnel connects outlet pipe, and the vertex of outlet pipe is lower than crude brine import place sea line; Described membrane filter is Skyworth's tubular membrane strainer.

The utility model adopts stir shaft and waterpower to flow and helps reaction and CaCO ₃Deng the crystal growth process, form the U type by the outlet pipe that is communicated with tower body, the potential difference of minimizing equipment import and export, and utilize the low filtration resistance (0.008-0.03Mpa) of Skyworth's tubular membrane strainer, realize non-pump type gravity flow filtration, more can adapt to the large-scale production that year treatment capacity is the 15-20 ton, power consumption both reduced, save energy is not destroyed CaCO again ₃Deng crystalline structure.

For increasing Na ₂CO ₃With contact area and the reaction times of crude brine in reaction tower, the exit end of bottom, the utility model teeter column connects centrifugal guide pipe, can make the fluid that leaves in the teeter column obtain the centrifugal force identical with whipping appts, both realized shortening stir shaft, reach the purpose of the required environment of reactive crystallization again, not only play a multiplier role, but also the work-ing life that can improve stir shaft.

The utility model also is communicated with horn-like funnel at the center of the ladder type mud scum receiving device on pretreater top, and this funnel is communicated with the mud scum outlet of mud scum susceptor.Form annular spoil disposal, spoil disposal is even, and speed is fast, is more suitable for large section pretreater and large-scale treatment system.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the enlarged diagram of the preceding reactor of filter;

Fig. 3 is the vertical view of centrifugal guide pipe;

Fig. 4 is the local structure synoptic diagram of pretreater.

Specific embodiment

Among Fig. 1,1 pretreater, reactor before 2 filters, 3 Skyworth's tubular membrane strainers, 4 filter clarified brine storage tank, and each equipment is connected in series successively with transport pipe 5.

Among Fig. 2, the housing 6 of reactor 2 is cylindrical before the filter, the bottom is provided with the joint flange limit, the first half at housing 6 forms the teeter column by 7 sealings of sharp cone distal dividing plate, the axis place that goes to the bottom at dividing plate 7 offers circular hole, connects centrifugal as shown in Figure 3 guide pipe 8, and the axis place vertically arranges motor 9 at the top of housing 6, motor 9 connects the terminal stir shaft 10 that stretches in the housing 6, and a manhole 11 and a Na also is set at the top ₂CO ₃Connecting hole 12 is also offered crude brine import 13, side direction manhole 14 at the sidepiece of teeter column.Establish big, following young taper funnel 15 suitable for reading in housing 6 bottoms, the upper end seal welding of funnel 15 is at the inwall of housing 6, the lower end is communicated with a U-shaped outlet pipe 16, and offer manhole 17, offer mud hole 18 at the lowest part of U-shaped outlet pipe 16 at a sidewall of funnel 15, U-shaped outlet pipe 16 is away from the end vertex of the funnel 15 level height line a little less than the crude brine import 13 of housing 6.

At housing 6 internal fixing one conical deflector 19 of 15 in centrifugal guide pipe 8 and funnel, the lower end external diameter of director 19 is less than the upper port internal diameter of funnel 15.

As shown in Figure 4, the top of pretreater 1 is provided with annular mud scum receiving device, annular mud scum receiving device is made up of a trapezoidal mud scum receiving device 20 and a funnel 21, funnel 21 is arranged in the center of trapezoidal mud scum receiving device 20, the bottom of funnel 21 is communicated with the mud scum outlet by pipeline 22, the bottom of funnel 21 is communicated with the mud scum outlet by pipeline 22, and a side of trapezoidal mud scum receiving device 20 also is communicated with the mud scum outlet by pipeline 23.Offer the liquid outlet 24 that can be connected with filter front processor 2 at another sidewall of pretreater 1.

Claims

1, the treatment system of salt refining, comprise pretreater, the preceding reactor of filter, membrane filter, filtration clarified brine storage tank, interconnect successively with pipeline between above-mentioned each device, the intravital top of shell that it is characterized in that reactor before described filter is provided with the teeter column, with establish crude brine import and Na2CO3 import in the teeter column, axial arranged stir shaft in the teeter column sets out mouth at the axis place of bottom, teeter column; Arrange conical deflector in the housing below the teeter column, in the arranged beneath funnel of conical deflector, the bottom of funnel connects outlet pipe, and the vertex of outlet pipe is lower than crude brine import place sea line; Described membrane filter is Skyworth's tubular membrane strainer.

2,, it is characterized in that the exit end of bottom, teeter column connects centrifugal guide pipe according to the described treatment system of claim 1.

3,, it is characterized in that offering mud hole, and on mud hole, flexibly connect capping in the bottom of the outlet pipe that is connected with funnel according to the described treatment system of claim 1.

4, according to claim 1 or 2 or 3 described treatment systems, it is characterized in that described funnel is big, following young taper suitable for reading, its internal diameter suitable for reading is greater than the external diameter of the bottom of conical deflector.

5, according to the described treatment system of claim 1, it is characterized in that being communicated with horn-like funnel at the center of the ladder type mud scum receiving device on pretreater top, this funnel is communicated with the mud scum outlet of mud scum susceptor.