阅读说明：本技术 一种用于液晶显示屏减薄的处理液回收处理方法 (Processing liquid recovery processing method for thinning liquid crystal display screen ) 是由 肖亮灿 于 2020-04-29 设计创作，主要内容包括：本发明公开一种用于液晶显示屏减薄的处理液回收处理方法,包括以下步骤：废液收集、初步过滤、沉淀反应、萃取反应、回收和处理；本发明通过过滤箱中的过滤网分别对玻璃基板减薄刻蚀废液和铟锡氧化物刻蚀废液进行初步过滤,通过碱金属盐沉淀剂对玻璃基板减薄刻蚀废液进行化学沉淀,从而得到氟硅酸和用于减薄蚀刻的纯净酸性液体,通过萃取剂和反萃剂对铟锡氧化物刻蚀废液进行铟金属萃取,从而实现玻璃基板减薄刻蚀废液和铟锡氧化物刻蚀废液的分类回收利用,工艺流程简单快速,处理成本较低,且处理过程中无废物排放,消除了环境污染,为液晶显示屏减薄用处理液回收处理开辟了新的途径,经济和社会效益显著,具有很好的应用前景。(The invention discloses a processing liquid recovery processing method for thinning a liquid crystal display screen, which comprises the following steps: collecting waste liquid, primarily filtering, precipitating, extracting, recovering and treating; the invention respectively carries out preliminary filtration on the glass substrate thinning etching waste liquid and the indium tin oxide etching waste liquid through the filter screen in the filter box, carries out chemical precipitation on the glass substrate thinning etching waste liquid through the alkali metal salt precipitator so as to obtain the fluosilicic acid and the pure acidic liquid for thinning etching, and carries out indium metal extraction on the indium tin oxide etching waste liquid through the extractant and the back extractant so as to realize the classified recycling of the glass substrate thinning etching waste liquid and the indium tin oxide etching waste liquid.)

1. A processing liquid recovery processing method for thinning a liquid crystal display screen is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: collecting waste liquid

Preparing two collecting boxes, respectively communicating the two collecting boxes with a discharge port of glass substrate thinning etching liquid and indium tin oxide etching liquid of a liquid crystal display screen thinning processing device, respectively collecting glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid generated in the liquid crystal display screen thinning processing process through the two collecting boxes, and finally obtaining glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid to be recycled;

step two: preliminary filtration

According to the first step, respectively pouring the collected glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid into different filter boxes for primary filtration, intercepting and filtering oil stains and impurities in the glass substrate thinning etching waste liquid and the indium tin oxide etching waste liquid through filter screens arranged in the filter boxes, and respectively pouring the filtered glass substrate thinning etching waste liquid and the filtered indium tin oxide etching waste liquid into different reaction tanks to obtain relatively pure glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid;

step three: precipitation reaction

According to the second step, after relatively pure glass substrate thinning etching waste liquid is obtained, chemical precipitation is carried out on the glass substrate thinning etching waste liquid, firstly, alkali metal salt precipitator is added into a glass substrate thinning etching waste liquid reaction tank, the glass substrate thinning etching waste liquid and the alkali metal salt precipitator are uniformly mixed and fully react for one hour, then, the glass substrate thinning etching waste liquid after reaction is poured into a sedimentation tank, flocculating agent is added into the sedimentation tank, then, high-pressure filtration is carried out on the glass substrate thinning etching waste liquid by adopting a high-pressure filtration method, and fluosilicic acid and pure acidic liquid for thinning etching are obtained;

step four: extraction reaction

According to the second step, after relatively pure indium tin oxide etching waste liquid is obtained, carrying out extraction treatment on the indium tin oxide etching waste liquid, firstly, adding an acidic phosphorus type extracting agent into a reaction tank of the indium tin oxide etching waste liquid to carry out multistage extraction on the indium tin oxide etching waste liquid, so that indium metal in the indium tin oxide etching waste liquid is transferred into an organic system, and then, adding a stripping agent into the indium tin oxide etching waste liquid to concentrate the indium metal into the stripping agent;

step five: recovery and disposal

According to the third step and the fourth step, firstly, drying the obtained fluosilicic acid, then collecting the fluosilicic acid salt obtained by drying for preparing a fluorine-containing product, then adding the pure acidic liquid for thinning and etching into a diffusion dialyzer for dialysis treatment and adding an acid component to obtain a glass substrate thinning and etching liquid, collecting the glass substrate thinning and etching liquid, and finally carrying out electrolytic refining on the indium tin oxide etching mixed liquid containing a stripping agent to obtain an indium product.

2. The method of claim 1, wherein the method comprises the steps of: in the second step, the filter screen in the filter box is a 300-mesh steel wire mesh and is movably installed with the filter box.

3. The method of claim 1, wherein the method comprises the steps of: in the third step, the alkali metal salt precipitator is a sodium chloride precipitator, the molar ratio of the alkali metal salt precipitator to the fluosilicic acid is 3, and the flocculating agent is polyaluminium sulfate.

4. The method of claim 1, wherein the method comprises the steps of: in the third step, the alkali metal salt precipitator is potassium chloride precipitator, the molar ratio of the alkali metal salt precipitator to the fluosilicic acid is 2.8, and the flocculating agent is polyaluminium chloride.

5. The method of claim 1, wherein the method comprises the steps of: in the fourth step, the acidic phosphorus type extracting agent is diphosphate with the concentration of 25 percent, the back extracting agent is hydrogen chloride, and the back extraction time is ten minutes.

Technical Field

The invention relates to the technical field of liquid crystal display screen processing, in particular to a processing liquid recycling method for thinning a liquid crystal display screen.

Background

Along with the rapid development of information technology in China, an old electronic tube display screen is replaced by a novel liquid crystal display screen, the clear and eye-friendly liquid crystal display screen becomes a new favorite of people, in order to meet the visual experience of people on high definition image quality and the requirement that the liquid crystal display screen can be moved at will, a liquid crystal display screen manufacturer continuously starts to research and develop thinning technology of the display screen from each convenience, the definition, the lightness and the intellectualization of the liquid crystal display screen are ensured, the current thinning technology of the liquid crystal display screen mainly comprises physical grinding thinning and chemical etching thinning, and the chemical etching thinning method is widely applied by the special advantages of the chemical etching thinning method;

the prior chemical etching method for thinning the liquid crystal display screen generally directly adopts aqueous solution of hydrofluoric acid mixture to etch and thin the silicon dioxide glass substrate, and adds nitric acid solution and hydrochloric acid solution to control the etching strength and speed in the etching process, thereby accurately controlling the thickness of the liquid crystal display screen, generating a large amount of substrate glass thinning etching waste liquid and indium tin oxide etching waste liquid in the etching process, if the waste liquids are directly discharged, the method wastes resources while causing environmental pollution, and most of the existing waste liquid treatment methods adopt a lime neutralization treatment method, but the method also generates a large amount of fluorine-containing waste residues, the fluorine-containing waste residues as hazardous wastes also need special treatment, and the treatment cost is increased, so the invention provides a treatment liquid recovery treatment method for thinning the liquid crystal display screen to solve the problems in the prior art.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a method for recycling treatment liquid for thinning a liquid crystal display screen.

In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a processing liquid recovery processing method for thinning a liquid crystal display screen comprises the following steps:

the method comprises the following steps: collecting waste liquid

Preparing two collecting boxes, respectively communicating the two collecting boxes with a discharge port of glass substrate thinning etching liquid and indium tin oxide etching liquid of a liquid crystal display screen thinning processing device, respectively collecting glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid generated in the liquid crystal display screen thinning processing process through the two collecting boxes, and finally obtaining glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid to be recycled;

step two: preliminary filtration

According to the first step, respectively pouring the collected glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid into different filter boxes for primary filtration, intercepting and filtering oil stains and impurities in the glass substrate thinning etching waste liquid and the indium tin oxide etching waste liquid through filter screens arranged in the filter boxes, and respectively pouring the filtered glass substrate thinning etching waste liquid and the filtered indium tin oxide etching waste liquid into different reaction tanks to obtain relatively pure glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid;

step three: precipitation reaction

According to the second step, after relatively pure glass substrate thinning etching waste liquid is obtained, chemical precipitation is carried out on the glass substrate thinning etching waste liquid, firstly, alkali metal salt precipitator is added into a glass substrate thinning etching waste liquid reaction tank, the glass substrate thinning etching waste liquid and the alkali metal salt precipitator are uniformly mixed and fully react for one hour, then, the glass substrate thinning etching waste liquid after reaction is poured into a sedimentation tank, flocculating agent is added into the sedimentation tank, then, high-pressure filtration is carried out on the glass substrate thinning etching waste liquid by adopting a high-pressure filtration method, and fluosilicic acid and pure acidic liquid for thinning etching are obtained;

step four: extraction reaction

According to the second step, after relatively pure indium tin oxide etching waste liquid is obtained, carrying out extraction treatment on the indium tin oxide etching waste liquid, firstly, adding an acidic phosphorus type extracting agent into a reaction tank of the indium tin oxide etching waste liquid to carry out multistage extraction on the indium tin oxide etching waste liquid, so that indium metal in the indium tin oxide etching waste liquid is transferred into an organic system, and then, adding a stripping agent into the indium tin oxide etching waste liquid to concentrate the indium metal into the stripping agent;

step five: recovery and disposal

According to the third step and the fourth step, firstly, drying the obtained fluosilicic acid, then collecting the fluosilicic acid salt obtained by drying for preparing a fluorine-containing product, then adding the pure acidic liquid for thinning and etching into a diffusion dialyzer for dialysis treatment and adding an acid component to obtain a glass substrate thinning and etching liquid, collecting the glass substrate thinning and etching liquid, and finally carrying out electrolytic refining on the indium tin oxide etching mixed liquid containing a stripping agent to obtain an indium product.

The further improvement lies in that: in the second step, the filter screen in the filter box is a 300-mesh steel wire mesh and is movably installed with the filter box.

The further improvement lies in that: in the third step, the alkali metal salt precipitator is a sodium chloride precipitator, the molar ratio of the alkali metal salt precipitator to the fluosilicic acid is 3, and the flocculating agent is polyaluminium sulfate.

The further improvement lies in that: in the third step, the alkali metal salt precipitator is potassium chloride precipitator, the molar ratio of the alkali metal salt precipitator to the fluosilicic acid is 2.8, and the flocculating agent is polyaluminium chloride.

The further improvement lies in that: in the fourth step, the acidic phosphorus type extracting agent is diphosphate with the concentration of 25 percent, the back extracting agent is hydrogen chloride, and the back extraction time is ten minutes.

The invention has the beneficial effects that: the invention firstly carries out preliminary filtration on glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid respectively through a filter screen in a filter box, thereby taking out oil stains and impurities in the glass substrate thinning etching waste liquid and the indium tin oxide etching waste liquid, further obtaining relatively pure glass substrate thinning etching waste liquid and indium tin oxide etching waste liquid for subsequent recovery treatment, then carrying out chemical precipitation on the glass substrate thinning etching waste liquid through an alkali metal salt precipitator, thereby obtaining fluosilicic acid and pure acidic liquid for thinning etching, further preparing the fluosilicic acid into fluorine-containing products for self use and sale, preparing the pure acidic liquid into the glass substrate thinning etching liquid for recycling, then carrying out indium metal extraction on the indium tin oxide etching waste liquid through an acidic phosphorus type extractant and a hydrogen chloride back extractant, and obtaining an indium product through point decomposition and refining, the method has the advantages of simple and quick process flow, low treatment cost, no waste discharge in the treatment process, no environmental pollution, obvious economic and social benefits and good application prospect, and opens up a new way for the recovery treatment of the treatment liquid for the thinning of the liquid crystal display screen.

Drawings

FIG. 1 is a flow chart of the recovery process of the present invention.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.