Method for supplementing water to dilute concentrated solution of salt lake brine

A salt lake brine and concentrated solution technology, applied in separation methods, mixing methods, chemical instruments and methods, etc., can solve the problems of low output of diluent and slow liquid return speed of concentrated solution, and achieve uniform concentration, conductivity value and pH The effect of stabilizing and increasing yield

Active Publication Date: 2021-06-18
青海东台吉乃尔锂资源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method preheats the raw material water, and dilutes the concentrated liquid return liquid from multiple electrodialysis units through the control mechanism and multiple dilution tanks, which can effectively solve the problem of discharging the concentrated liquid return liquid from the overflow of the electrodialysis unit. The problem of slow speed and low diluent output

Method used

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  • Method for supplementing water to dilute concentrated solution of salt lake brine
  • Method for supplementing water to dilute concentrated solution of salt lake brine
  • Method for supplementing water to dilute concentrated solution of salt lake brine

Examples

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Embodiment

[0138] Hereinafter, the present invention will be described in detail with reference to Examples. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided so as to more fully describe the present invention to those skilled in the art.

[0139] If the experimental methods in the following examples do not indicate specific conditions, they are usually the conventional conditions in this field or the conditions suggested by the manufacturer; the raw materials and equipment used, if no special instructions, are available from commercial channels such as the conventional market Raw materials and equipment obtained.

Embodiment 1

[0151] refer to figure 2 , compared with the prior art single make-up water dilution system in Comparative Example 1, in the multi-stage make-up water dilution system of the present embodiment, a heating mechanism 200 is additionally added, and a new control mechanism 220 is used, wherein the dilution tank 230A , 230B, and 230C are all diluted with water, and the water intake of the dilution tanks 230A, 230B, and 230C is distributed in a gradually decreasing manner, and the raw water replenishment at the top of the storage mechanism 250 is canceled.

[0152] The workflow of this embodiment is as follows.

[0153] First, the raw water 21a (50.00m 3 / h, 15°C) to the plate heat exchanger as the heating mechanism 200 (from Alfa Laval (Shanghai) Technology Co., Ltd., the material is TA), and at the same time, 120°C from the gas supply facility is passed into the plate heat exchanger The steam 20a (1m 3 / h) to heat raw water 21a to obtain heated water 21b whose temperature is 33...

experiment example 1

[0165] Through the feedback data provided by DCS (Zhejiang University Central Control Program Control System), the operation of each mechanism and device in Comparative Example 1 and Example 1 is controlled, and various data are obtained by measurement, which are summarized in Table 1 below.

[0166] Table 1

[0167]

[0168] As can be seen from Table 1, when the total amount of water added, the flow of hydrochloric acid solution and the flow of salt lake brine added are all the same respectively, compared with Comparative Example 1, the final dilution of Example 1 significantly improves the output. And have the same lithium ion content. This fully demonstrates that the multi-stage replenishment dilution method of the present invention can significantly increase the output of diluent.

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Abstract

The invention relates to a method for supplementing water to dilute a concentrated solution of salt lake brine, which comprises the following steps: (1) heating raw material water through a heating mechanism to obtain heated water; (2) filtering the heated water through a filtering mechanism to obtain filtered water; (3) enabling the filtered water to pass through a control mechanism and a plurality of dilution tanks to dilute concentrated return liquids from a plurality of electrodialysis units respectively; and (4) overflowing and discharging the final diluted liquid from the upper part of the last dilution tank. According to the method, the speed of discharging the concentrated liquid from the electrodialysis unit in an overflowing manner is remarkably increased, so that the yield of the diluted liquid is increased.

Description

technical field [0001] The invention relates to the field of preparation methods of battery-grade lithium carbonate, in particular to a method for replenishing and diluting a concentrated solution obtained after electrodialysis and separation of salt lake brine. Background technique [0002] Currently, electrodialysis devices are used for the separation of high magnesium-lithium ratio salt lake brine. The salt lake brine is mainly a saturated magnesium chloride solution, the ratio of magnesium to lithium in the solution is 20:1, and can be used as a raw material for preparing battery-grade lithium carbonate. [0003] The electrodialysis device mainly adopts the ion selective migration technology, and under the action of a direct current electric field, the ions in the salt lake brine form a directional migration, so as to achieve the effect of magnesium and lithium separation. The electrodialysis device comprises a plurality of electrodialysis units (not connected to each o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/42B01D36/00B01F3/08C01D15/08
CPCB01D61/422B01D36/008C01D15/08C01P2006/80B01F23/405B01F23/483B01F23/49
Inventor 李健王洪张延海东宝山董锐李海能郭文俊李迎风焦兴霞祁选选
Owner 青海东台吉乃尔锂资源股份有限公司
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