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Method for preparing high refractive index optical thin film by using chromium slag

A high-refractive-index, optical thin-film technology, applied in optics, optical components, liquid chemical plating, etc., can solve problems such as chromium slag pollution, and achieve the effects of simple production process, mild reaction conditions, and low production cost

Inactive Publication Date: 2013-06-19
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for preparing high-refractive-index optical films from chromium slag, to solve the pollution problem of chromium slag, and to make full use of metal elements such as Fe, Mg, Al, Cr, and Ca in chromium slag, which can Produce optical films with high refractive index and suitable for industrial applications

Method used

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  • Method for preparing high refractive index optical thin film by using chromium slag
  • Method for preparing high refractive index optical thin film by using chromium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 10g of chromium slag to the hydrochloric acid solution with a concentration of 0.3 mol / L, dissolve it at 90°C, filter, and remove the insoluble matter to obtain the filtrate; measure the Cr(VI) content in the filtrate, according to the Cr(Ⅵ) content in the filtrate Ⅵ) Add ferrous sulfate to 1.1 times the theoretically calculated amount of reductant ferrous sulfate required for reduction to Cr(Ⅲ), and react under stirring conditions for 120 min; add sodium hydroxide solution with a concentration of 0.5 mol / L to make the filtrate pH= 3.0, heated to 90°C to fully separate out the precipitate, filter, retain the filter residue, add sulfuric acid solution with a concentration of 0.3 mol / L to the filter residue to dissolve it, and obtain the stock solution for film preparation.

[0023] Take 20g film to prepare stock solution, adjust pH=10.0 with 1.5mol / L sodium hydroxide solution, add 1% surfactant sodium dodecylbenzene sulfonate according to the mass ratio of film prepar...

Embodiment 2

[0027] Add 5g of chromium slag to the concentrated hydrochloric acid solution, dissolve it at 20°C, filter, and remove the insoluble matter to obtain the filtrate; measure the Cr(VI) content in the filtrate, and reduce Cr(VI) in the filtrate to Cr( Ⅲ) Add ferrous sulfate to 1.5 times the theoretically calculated amount of the required reducing agent, ferrous sulfate, and react for 30 minutes under stirring conditions to reduce Cr(Ⅵ) in the solution to Cr(Ⅲ); add sodium hydroxide to make the filtrate pH= 4.6. Heat to 30°C to fully separate out the precipitate, filter, keep the filter residue, add concentrated sulfuric acid solution to the filter residue to dissolve it, and obtain the stock solution for film preparation.

[0028] Take 10g film to prepare stock solution, adjust pH=7.0 with 0.3mol / L sodium hydroxide solution, add 3% mineralizer sodium carbonate according to the mass ratio of film preparation stock solution, stir evenly, pour into a closed hydrothermal reaction kett...

Embodiment 3

[0030] Add 10g of chromium slag to a hydrochloric acid solution with a concentration of 0.8mol / L, dissolve it at 60°C, filter, and remove insoluble matter to obtain a filtrate; measure the Cr(VI) content in the filtrate, according to the Cr(Ⅵ) content in the filtrate Ⅵ) Add ferrous sulfate to 1.3 times the theoretically calculated amount of reductant ferrous sulfate required for reduction to Cr(Ⅲ), and react for 60 min under stirring conditions to reduce Cr(Ⅵ) in the solution to Cr(Ⅲ); the added concentration is 3.0 mol / L sodium hydroxide solution, make the filtrate pH = 1.5, heat to 60°C, fully precipitate the precipitate, filter, retain the filter residue, add sulfuric acid solution with a concentration of 0.8 mol / L to the filter residue, dissolve it, and obtain Optical film preparation stock solution.

[0031] Take 20g film to prepare stock solution, adjust pH=10.0 with 5.0mol / L sodium hydroxide solution, add 0.5% surfactant sodium dodecylbenzenesulfonate and 1.5% mineraliz...

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Abstract

The invention relates to a method for preparing a high refractive index optical thin film by using chromium slag. The method comprises the following steps of: dissolving the chromium slag in strong acid, filtering the strong acid to obtain a filtrate; determining the content of Cr (VI) in the filtrate, and adding a reducing agent to restore the Cr (VI) in the filtrate into Cr (III); adding an aqueous alkali to the filtrate for adjusting the pH value, heating the filtrate to separate out precipitates, filtering the filtrate to obtain filter residues, adding the strong acid to the filter residues for dissolving the filter residues, and obtaining a stock solution for preparing the thin film; and adjusting the pH value of the stock solution by using the aqueous alkali, adding a surface activeagent and a mineralizing agent to the stock solution, uniformly stirring the stock solution, pouring the stock solution to a hydro-thermal reaction kettle, placing a substrate to be coated in the stock solution for coating, cooling the reaction kettle, taking out the coated substrate, and washing and drying the substrate to obtain the high refractive index optical thin film. The method has the advantages of mild reaction conditions, simple productive process, easily controlled operational process and low production cost; according to the method, metallic elements in the chromium slag are fully used, the pollution of the chromium slag is reduced, the prepared thin film has a continuous and uniform surface and high refractive index, the refractive index of the thin film is 2.20-2.50 at the wavelength of 632.8mn, and therefore, the high refractive index optical thin film can be widely applied to the optics field.

Description

technical field [0001] The invention belongs to a comprehensive utilization method of chromium slag, in particular to a method for preparing a high-refractive-index optical film from chromium slag. Background technique [0002] Chromium salt is one of the important inorganic chemical products. Its series products are a class of chemical raw materials that my country focuses on. They are widely used and are listed as one of the eight most competitive resource raw materials in the world. However, the production of chromium products The formed chromium slag is one of the most important industrial pollution sources of heavy metals in the world. Chromium slag is gray or black mixed with yellow or tan loose, irregular solid powder, granular or small lumps, in which the Cr(Ⅵ) compound has a strong oxidizing ability and can pass through the digestive tract and skin Enter the human body, distribute in the liver and kidney, or accumulate in the lungs through the respiratory tract, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/12G02B1/10B09B3/00
Inventor 孙彤刘连利徐姝颖彭晓琳杨海龙
Owner BOHAI UNIV
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