Separation method for indium leachate of waste liquid crystal display

Abstract

The invention discloses a separation method for indium leachate of a waste liquid crystal display. The separation method comprises the following steps: preparing an acid leaching solution by using a disassembled and broken indium-containing glass sheet of a waste liquid crystal display panel; slowly adding caustic soda into the obtained acid leaching solution for neutralization to adjust a pH value, separating out brown rubber substances, and filtering out and recovering separated impurities; filtering the acid leaching solution, and adding an organic phase into the filtered acid leaching solution so as to prepare an organic phase extract containing indium; adding a H2SO4 solution to wash the organic phase extract; and carrying out back extraction on the indium-containing organic phase extraction to obtain an indium-containing water-phase extract. According to the invention, the efficiency of recovering indium through acid leaching extraction is relatively high, the recycling cost of the extracting agent is also relatively low, and pollution to the environment is also relatively small.

Description

technical field

[0001] The invention relates to the field of recycling waste liquid crystal panels, and more specifically relates to a method for separating the indium leaching solution of waste liquid crystal panels. Background technique

[0002] Indium is a scattered metal widely used in military, national defense, energy, electronics, medical and other fields, and its reserves in the earth's crust are only 1 / 6 of gold. The amount of indium used in new applications will increase at a rate of 10-20% per year, and 60-70% of indium products are used in the production of indium tin oxide for liquid crystal displays. ITO film has transparency and conductivity, and is mainly used in the electronics industry. ITO glass is widely used in transparent electrodes for flat panel displays. At present, developed countries in the world such as Japan, the United States, France, and the United Kingdom use about half of indium for the preparation of ITO targets, and the domestic preparati...

Examples

Embodiment 1

[0031] Such as figure 1 As shown, a method for separating the indium leachate of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0032] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0033] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0034] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to -0.3, brown rubber is separated out, filter the separated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0035] (4) filter the gained filtrate of step (3) gained acid dipping liquid and extract, get the leachate of 500ml and add in the separatory fu...

Embodiment 2

[0038] A method for separating the indium leaching solution of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0039] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0040] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0041] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to 0.5, brown rubber is separated out, filter the precipitated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0042] (4) filter the gained filtrate of step (3) gained leachate and extract, get the leachate of 500ml and add in the separatory funnel, then add 100ml organic...

Embodiment 3

[0045] A method for separating the indium leaching solution of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0046] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0047] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0048] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to 1, brown rubber is separated out, filter the precipitated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0049] (4) filter the gained filtrate of step (3) gained leachate and extract, get the leachate of 500ml and add in the separatory funnel, then add 100ml organic pha...

technical field

[0001] The invention relates to the field of recycling waste liquid crystal panels, and more specifically relates to a method for separating the indium leaching solution of waste liquid crystal panels. Background technique

[0002] Indium is a scattered metal widely used in military, national defense, energy, electronics, medical and other fields, and its reserves in the earth's crust are only 1 / 6 of gold. The amount of indium used in new applications will increase at a rate of 10-20% per year, and 60-70% of indium products are used in the production of indium tin oxide for liquid crystal displays. ITO film has transparency and conductivity, and is mainly used in the electronics industry. ITO glass is widely used in transparent electrodes for flat panel displays. At present, developed countries in the world such as Japan, the United States, France, and the United Kingdom use about half of indium for the preparation of ITO targets, and the domestic preparati...

Examples

Embodiment 1

[0031] Such as figure 1 As shown, a method for separating the indium leachate of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0032] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0033] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0034] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to -0.3, brown rubber is separated out, filter the separated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0035] (4) filter the gained filtrate of step (3) gained acid dipping liquid and extract, get the leachate of 500ml and add in the separatory fu...

Embodiment 2

[0038] A method for separating the indium leaching solution of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0039] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0040] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0041] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to 0.5, brown rubber is separated out, filter the precipitated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0042] (4) filter the gained filtrate of step (3) gained leachate and extract, get the leachate of 500ml and add in the separatory funnel, then add 100ml organic...

Embodiment 3

[0045] A method for separating the indium leaching solution of waste liquid crystal screens shown in this embodiment comprises the following steps:

[0046] (1) The waste liquid crystal panel is broken to obtain a 5cm strip, and the strip is rolled to break the glass stuck on the polarizer;

[0047] (2) Carry out acid leaching treatment to the product processed through above-mentioned steps (1), the used leaching solution of acid leaching is that concentration is 20%H 2 SO 4 solution, the acid leaching process temperature is 50°C, and the soaking time is 4 hours;

[0048] (3) Slowly add caustic soda to the leachate obtained in step (2) for neutralization, adjust the pH to 1, brown rubber is separated out, filter the precipitated impurities, and reclaim the filter residue tin hydroxide as a chemical raw material;

[0049] (4) filter the gained filtrate of step (3) gained leachate and extract, get the leachate of 500ml and add in the separatory funnel, then add 100ml organic pha...

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