A kind of polarizing plate waste liquid treatment method

A waste liquid treatment and polarizing plate technology, which is applied in chemical instruments and methods, alkali metal halide purification, boron oxides, etc., can solve the problem of high requirements for precise control of concentration ratio, large calcium hydroxide, large consumption of acid and alkali, etc. problems, to achieve the effect of high industrial application prospects, low energy consumption and cost, and high economic value

Active Publication Date: 2022-07-26
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1673079A discloses a preparation process for reclaiming boric acid and magnesium sulfate by evaporating and concentrating boric acid mother liquor in salt fields. It mainly uses flotation to separate the mixture of boric acid and magnesium sulfate. However, the separation effect of this method has certain influence on the particle size of solids. Requirements, organic reagents will be used in the flotation process, and the value of the obtained product is relatively low
[0006] CN101659418A discloses a method for preparing boric acid in boron-containing sodium chloride potassium chloride saturated brine solution, utilizes the difference in solubility between borate and sodium chloride potassium chloride, separates by evaporation and concentration, but finally obtains In the process of boric acid production, a large amount of acid and alkali needs to be consumed, and the requirement for precise control of the concentration ratio is high, and the inorganic salt in the saline-containing boric acid mother liquor cannot be used
[0007] CN109970073A discloses a method for reclaiming and preparing boric acid and potassium chloride from polarizing plate waste liquid, using calcium hydroxide to produce calcium borate with boron under high temperature conditions, and disposing of the remaining salt-containing boric acid mother liquor after boric acid extraction, but this method It needs to be carried out at high temperature, and consumes a large amount of calcium hydroxide, and the value of the calcium chloride solution produced is low

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  • A kind of polarizing plate waste liquid treatment method
  • A kind of polarizing plate waste liquid treatment method

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Comparison scheme
Effect test

Embodiment 1

[0079] This embodiment provides a method for processing polarizer waste liquid, the method comprising the following steps:

[0080] (1) 2L of polarizing plate waste liquid is distilled and concentrated under the condition of 100°C and -0.07MPa to obtain 200g of iodine-containing crude boric acid, and 70mL of potassium sulfite mass concentration is 0.7g / L potassium sulfite is added to the iodine-containing crude boric acid. The solution is used as a beating solution, and a beating process is performed. The beating process is repeated twice, filtered and separated to obtain crude boric acid and an iodine-containing solution. It is detected that the crude boric acid after beating does not contain potassium iodide, and the iodine-containing solution is returned to the polarizing plate waste liquid. , the iodine-containing crude boric acid includes 74 wt % of boric acid, 21 wt % of potassium tetraborate, 0.32 wt % of potassium iodide and 0.67 wt % of iodine by mass fraction;

[008...

Embodiment 2

[0085] The present embodiment provides a method for processing polarizer waste liquid, the method comprising the following steps:

[0086] (1) 4L of polarizing plate waste liquid was distilled and concentrated at 90°C and -0.08MPa to obtain 400g of iodine-containing crude boric acid, adding 140mL of potassium sulfite mass concentration to iodine-containing crude boric acid to be 0.7g / L of potassium sulfite The solution is used as a beating solution, and a beating process is performed. The beating process is repeated twice, filtered and separated to obtain crude boric acid and an iodine-containing solution. It is detected that the crude boric acid after beating does not contain potassium iodide, and the iodine-containing solution is returned to the polarizing plate waste liquid. , the iodine-containing crude boric acid includes 69 wt % of boric acid, 27 wt % of potassium tetraborate, 0.61 wt % of potassium iodide and 0.33 wt % of iodine by mass fraction;

[0087] (2) slowly add...

Embodiment 3

[0091] The present embodiment provides a method for processing polarizer waste liquid, the method comprising the following steps:

[0092] (1) 2L polarizing plate waste liquid is distilled and concentrated under the condition of 120 DEG C and -0.05MPa to obtain 200g iodine-containing crude boric acid, and adding 60mL potassium sulfite mass concentration to the iodine-containing crude boric acid is a potassium sulfite solution of 1g / L Make beating liquid, carry out beating treatment, described beating treatment is repeated 2 times, filter and separate to obtain crude boric acid and iodine-containing solution, detect that the crude boric acid after beating does not contain potassium iodide, and the iodine-containing solution is returned to the polarizing plate waste liquid , the iodine-containing crude boric acid includes 80wt% of boric acid, 15wt% of potassium tetraborate, 0.76wt% of potassium iodide and 0.12wt% of iodine by mass fraction;

[0093] (2) slowly adding the describ...

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Abstract

The present invention provides a method for treating polarizing plate waste liquid. The method uses a hydrofluoric acid-containing solution to treat a salt-containing boric acid solution after pretreatment and primary acidification. The potassium fluoroborate product realizes the separation of boron element and inorganic potassium and sodium salts; and can use the hydrofluoric acid waste liquid produced by other industries to treat the salt-containing boric acid solution, which further reduces the waste liquid treatment cost and improves the economic value.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a method for waste liquid treatment of polarizing plates. Background technique [0002] The polarizer is the core component of the liquid crystal panel, which is mainly used to transmit and block the light emitted by the backlight module. According to different materials, polarizers are divided into three categories: metal, iodine, and dyes. Among them, due to lower cost, iodine-based polarizers combined with iodine molecules and polyvinyl alcohol have the highest market share. In the process of preparing an iodine-based polarizer, the polyvinyl alcohol film needs to be dyed in an iodine-containing solution. The main components of this iodine-containing solution are iodine and potassium iodide, and boric acid is usually added to improve the polyvinyl alcohol film. hardness. With the consumption of the dyeing process, the used iodine-containing solution can no lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/06C01B35/10C01D3/04C01D3/14C01D9/00
CPCC01B35/066C01B35/109C01D3/04C01D9/00C01D9/16C01P2004/61C01P2006/80
Inventor 伍元东虞恺
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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