CN210885301U - Brine refining system - Google Patents

Abstract

The utility model discloses a brine refining system, which comprises a salt melting barrel, a diversion groove, a brine reactor, a brine transferring pump, a brine filter feeding tank, a filter feeding pump and a membrane filter which are connected in sequence, wherein a produced water outlet of the membrane filter is communicated with a water inlet of a refined brine tank through a pipeline; it also contains Na₂CO₃Storage tanks and NaOH storage tanks, Na₂CO₃The liquid outlets of the storage tank and the NaOH storage tank are communicated with the liquid inlet of the baffling groove through pipelines, and are communicated with Na₂CO₃The pipeline for the storage tank and the diversion groove and the pipeline for communicating the NaOH storage tank and the diversion groove are respectively provided with a flowmeter and a liquid adding valve, and the method has the advantages that the concentration of calcium and magnesium ions in produced water obtained by filtering through a membrane filter is lower than 3ppm, the index requirement of refined brine is met, a brine coarse filter and a brine fine filter are not required to be configured, α cellulose is not required to be used, the production cost is greatly reduced, the production amount of salt mud is reduced, and the environmental protection pressure and the treatment cost of the salt mud are reduced.

Description

Brine refining system

The technical field is as follows:

the utility model relates to a brine preparation field especially relates to a brine refining system.

Background art:

in the sodium chlorate production process, brine is an indispensable raw material for normal operation of an electrolytic cell, saturated brine is usually prepared by mixing salt brine with the temperature of over 45 ℃ and industrial salt, and calcium ions, magnesium ions and the like are contained in the prepared saturated brine due to high content of impurities such as calcium, magnesium and the like in the industrial salt, and if the saturated brine is directly used in the electrolytic cell, the calcium ions and the magnesium ions are attached to a cathode plate and an anode plate to influence the performance of a diaphragm, so that the diaphragm is blocked, and the current efficiency of the electrolytic cell is seriously influenced. Therefore, in order to overcome the above problems, it is necessary to treat the saturated brine to remove calcium and magnesium ions and water-insoluble substances therein, so as to obtain refined brine, which ensures the stable and reliable operation of the sodium chlorate production system.

The structural schematic diagram of a brine refining system for preparation commonly used at present is shown in fig. 1, and the system comprises a salt melting barrel 1, a flow deflection groove 2, a brine reactor 3, a brine transfer pump 4 and a dalwood clarifier 12 which are sequentially connected, wherein a supernatant outlet of the dalwood clarifier 12 is sequentially connected with a brine filter feeding tank 5, a filter feeding pump 6 and a brine coarse filter 13 through pipelines, water produced by the brine coarse filter 13 is connected with a water inlet of a brine fine filter 14, and a water produced by the brine fine filter 14 is connected with a water inlet of a brine refining tank 8. Firstly, mixing salt water with temperature of more than 45 ℃ and industrial salt in a salt dissolving barrel 1 to prepare saturated brine, overflowing the saturated brine, then feeding the saturated brine into a baffling tank 2, and passing Na₂CO₃A sodium carbonate solution and a sodium hydroxide solution are added into the baffling tank 2 by a storage tank 9 and a NaOH storage tank 10, so that calcium and magnesium ions in the brine respectively produce calcium carbonate solid particles and magnesium hydroxide colloid, and then the calcium and magnesium ions enter a brine reactor 3 to provide sufficient reaction time for the calcium and magnesium ions, the sodium carbonate solution and the sodium hydroxide solution to fully react; then the obtained supernatant enters a brine filter feeding tank 5, and is conveyed to a brine coarse filter 13 by a filter feeding pump 6 for coarse filtration, the obtained produced water is further conveyed to a brine fine filter 14 for fine filtration, and finally the obtained produced water is refined brine with high sodium chloride purity and is conveyed to a refined brine tank 8 for storage and standby.

However, the currently adopted system has the following problems that 1, the dalwood clarifier 12 is high in cost and high in operation and maintenance cost in the use process, the operation cost of the whole system is greatly increased, 2, the dalwood clarifier 12 is poor in filtering effect, the content of calcium and magnesium ions in obtained supernatant is about 50ppm, a brine coarse filter 13 and a brine fine filter 14 are required to be configured to achieve the index requirement of brine refining under the synergistic effect, 3, cellulose α is required to be regularly pre-coated in the brine coarse filter 13 and the brine fine filter 14 to form filtering membranes, so that the consumption of α cellulose is large, the production cost is increased due to the high cost of α cellulose, the economic benefit of enterprises is seriously affected, and 4 and α cellulose enters salt mud, so that the production amount of the salt mud is increased, the environmental protection pressure is increased, and the treatment cost of the salt mud is increased.

The utility model has the following contents:

an object of the utility model is to provide a system is refine to brine that simple structure, with low costs, filter effect are good.

The utility model discloses by following technical scheme implement:

a brine refining system comprises a salt melting barrel, a diversion tank, a brine reactor, a brine transfer pump, a brine filter feeding tank, a filter feeding pump and a membrane filter which are connected in sequence, wherein a water production outlet of the membrane filter is communicated with a water inlet of a refined brine tank through a pipeline;

it also contains Na₂CO₃Storage tank and NaOH storage tank, said Na₂CO₃The storage tank and the liquid outlet of the NaOH storage tank are communicated with the liquid inlet of the diversion groove through pipelines, and are communicated with the Na₂CO₃The pipeline of the storage tank and the diversion groove and the pipeline communicated with the NaOH storage tank and the diversion groove are both provided with a flowmeter and a liquid adding valve.

Further, the cylinder length of the membrane filter is 5680mm, and the filter element length of the membrane filter is 1750 mm.

The utility model has the advantages that:

1. the membrane filter can filter calcium carbonate solid particles and magnesium hydroxide colloid, and the membrane filter is used for filtering calcium carbonate solid particles and magnesium hydroxide colloidThe method has the advantages that the filtering effect is good, the concentration of calcium and magnesium ions in produced water obtained by filtering through the membrane filter is lower than 3ppm, the index requirement of refined brine is met, the produced water can directly enter a refined brine tank for storage and standby, a brine coarse filter and a brine fine filter are not required to be configured, the treatment process is shortened, α cellulose is not required to be used, the production cost is greatly reduced, the production amount of salt mud is reduced, the environmental protection pressure and the treatment cost of the salt mud are reduced, 2, compared with a dalwood clarifier, the purchase cost and the operation and maintenance cost of the membrane filter are greatly reduced, the economic benefit of an enterprise can be effectively improved, and 3, the size of the membrane filter is adjusted, so that the membrane area of a single group reaches 1.68m²The filtering pressure of the membrane filter is greatly reduced, and the filtering effect is ensured.

Description of the drawings:

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the prior art;

FIG. 2 is a schematic structural diagram of the present embodiment;

in the figure: salt dissolving barrel 1, baffling tank 2, brine reactor 3, brine transferring pump 4, brine filter feeding tank 5, filter feeding pump 6, membrane filter 7, refined brine tank 8 and Na₂CO₃ A storage tank 9, a NaOH storage tank 10, a clarifier 11, a brine coarse filter 12, a brine fine filter 13, a flowmeter 14 and a liquid adding valve 15.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

as shown in fig. 2, the brine refining system comprises a salt melting barrel 1, a baffle groove 2, a brine reactor 3, a brine transfer pump 4, a brine filter feeding tank 5, a filter feeding pump 6 and a membrane filter 7 which are connected in sequence, wherein a water production outlet of the membrane filter 7 is communicated with a water inlet of a refined brine tank 8 through a pipeline; the length of the cylinder body of the membrane filter 7 is 5680mm, and the length of the filter element of the membrane filter 7 is 1750 mm.

This embodiment also includes Na₂CO₃Storage tank 9 and NaOH storage tank 10, Na₂CO₃The liquid outlets of the storage tank 9 and the NaOH storage tank 10 are communicated with the liquid inlet of the baffle groove 2 through pipelines, and are communicated with Na₂CO₃The pipeline for the storage tank 9 and the baffling tank 2 and the pipeline for communicating the NaOH storage tank 10 and the baffling tank 2 are provided with a flowmeter 14 and a charging valve 15.

The working principle is as follows:

mixing salt solution with temperature higher than 45 ℃ and industrial salt in a salt dissolving barrel 1 to prepare saturated brine, overflowing the saturated brine and then feeding the saturated brine into a baffling tank 2, and adding sodium carbonate solution and sodium hydroxide solution into the baffling tank 2 to enable calcium and magnesium ions in the brine to respectively produce calcium carbonate solid particles and magnesium hydroxide colloid; then the reaction solution enters a brine reactor 3 to provide enough reaction time for calcium and magnesium ions, sodium carbonate solution and sodium hydroxide solution to fully react; then the brine is conveyed into a brine filter feeding tank 5 through a brine transfer pump 4, and is conveyed to a membrane filter 7 through a filter feeding pump 6 for filtering, calcium carbonate solid particles and magnesium hydroxide colloid are filtered, and the membrane filter 7 has a good filtering effect, so that the concentration of calcium and magnesium ions in produced water obtained through filtering through the membrane filter 7 is lower than 3ppm, the index requirement of refined brine is met, and the produced water can directly enter a refined brine tank 8 for storage and standby.

In this example, in order to further improve the filtration effect of the membrane filter 7, the size of the membrane filter 7 was adjusted such that the length of the cylinder of the membrane filter 7 was 5680mm and the length of the filter element of the membrane filter 7 was 1750mm, thereby making it possible to further improve the filtration effect of the membrane filter 7 by controlling the single membrane surface groupThe product reaches 1.68m²The filtering pressure of the membrane filter 7 is greatly reduced, and the filtering effect is ensured.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (2)

1. A brine refining system is characterized by comprising a salt melting barrel, a diversion tank, a brine reactor, a brine transfer pump, a brine filter feeding tank, a filter feeding pump and a membrane filter which are connected in sequence, wherein a water production outlet of the membrane filter is communicated with a water inlet of a refined brine tank through a pipeline;

it also contains Na₂CO₃Storage tank and NaOH storage tank, said Na₂CO₃The storage tank and the liquid outlet of the NaOH storage tank are communicated with the liquid inlet of the diversion groove through pipelines, and are communicated with the Na₂CO₃The pipeline of the storage tank and the diversion groove and the pipeline communicated with the NaOH storage tank and the diversion groove are both provided with a flowmeter and a liquid adding valve.

2. The brine refining system of claim 1, wherein the length of the cylinder of the membrane filter is 5680mm, and the length of the filter element of the membrane filter is 1750 mm.

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