Filtering method of sodium bichromate carbonizing liquid

A filtration method and a technology of sodium red alum, which are applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve the problems of unqualified quality of carbonized liquid and lower quality of sodium red alum, and achieve reduced chromium content, short unloading time, and good The effect of the filter effect

Inactive Publication Date: 2013-01-02
SICHUAN YINHE CHEM
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  • Abstract
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  • Claims
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Problems solved by technology

However, in the method of this patent, ordinary filtering means are used to filter the sodium rufium carbonization solution, which may cause a reverse reaction of the sodium ruthin carbonization solution, thereby causing the quality of the filtered carbonization solution to be unqualified, thereby reducing the quality of the sodium ruthin sodium prepared.

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  • Filtering method of sodium bichromate carbonizing liquid

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Embodiment Construction

[0017] In a specific embodiment, the present invention specifically provides the following technical solutions:

[0018] First, the pressurized sodium red alum carbonized liquid enters the improved vertical plate and frame filter press through the feed pipe. The improvement of the vertical plate and frame filter press mainly lies in the addition of a pressure regulating valve, which prevents the carbonized liquid from backflowing and reduces the filtration efficiency when the pressure is released by the filter press. Under the control of the filtrate pressure regulating valve, the filtration process is always maintained at a predetermined pressure. When the pressure in the vertical plate and frame filter press exceeds the predetermined pressure, the filtrate flows to the filtrate storage tank through the filtrate output pipe; when the pressure at the inlet end rises, the feed regulating valve set on the feed pipe is automatically closed, and the setting The filtrate pressure ...

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Abstract

The invention relates to a filtering method of sodium bichromate carbonizing liquid. The filtering method comprises the following steps: preparing sodium bichromate carbonizing liquid; and filtering the sodium bichromate carbonizing liquid under a condition that a preset pressure is kept. With the adoption of the filtering method of sodium bichromate carbonizing liquid provided by the invention, the sodium bichromate carbonizing liquid which is subjected to qualified carbonizing does not generate reverse reaction due to the reduction of the pressure.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for filtering sodium red alum carbonized liquid. Background technique [0002] Sodium red alum (sodium dichromate) is an important basic chemical raw material, mainly used in the production of chemical products such as chromic anhydride, chrome yellow, chromium oxide green and potassium dichromate. It is widely used as auxiliary agent in printing and dyeing industry, electroplating industry and leather industry, and as oxidant in many chemical industries. [0003] The Chinese invention patent CN101693556A titled "A Preparation Method of Sodium Red Alum" discloses in detail the method of producing sodium red alum by acidification with carbon dioxide instead of sulfuric acid. The entirety of this patent is incorporated herein by reference. However, in the method of this patent, common filtration means is used to filter the sodium rufium carbonization solution, which may c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/00C01G37/14
Inventor 李先荣陈宁张建军张天波
Owner SICHUAN YINHE CHEM
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