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Method for preparing basic chromium sulfate from menadione production raffinate

A technology of menadione and chromium sulfate, applied in the field of waste liquid treatment, can solve problems such as poor product quality, achieve the effects of bright and bright colors, solving pollution and darkening, and improving the utilization rate of raw materials

Active Publication Date: 2021-08-10
HUBEI ZHENHUA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the above-mentioned technical problems, the present invention provides a method for preparing basic chromium sulfate from the raffinate of menadione production, the method adds aging and solid-liquid separation steps before reduction, and selects fine filtration mode after reduction , can completely recover chromium in the k3 raffinate, and is easy to operate, solves the problem of poor product quality in the production of basic chromium sulfate from the raffinate of menadione, and the obtained basic chromium sulfate product can be widely used in Leather tanning, mordant dyeing, dyes, ceramic glaze, trivalent chromium plating or preparation of chromium salt products, etc.

Method used

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  • Method for preparing basic chromium sulfate from menadione production raffinate
  • Method for preparing basic chromium sulfate from menadione production raffinate

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Embodiment 1

[0065] The present embodiment provides a method for preparing basic chromium sulfate from the raffinate of menadione production, the method comprising the steps of:

[0066] (1) The raffinate of menadione production (the concentration of hexavalent chromium is 64g / L, and hexavalent chromium exists in the form of sodium alum, the concentration of sulfuric acid is 120g / L, menadione 0.00028g / L,) is often warmed successively for 25 ℃ aging for 72h and plate and frame filtration to obtain the treated liquid;

[0067] (2) Mixing step (1) The treated liquid and the 60-degree red vanadium sodium mother liquor, the obtained mixed material is filtered through a plate and frame, and then subjected to glucose for the first reduction at 101 ° C. After mixing, the material turns from yellow to yellow When it is dark green, use the indicator to test. If the indicator is red, continue to add the reducing agent. When the indicator turns dark purple, you can stop adding the reducing agent for t...

Embodiment 2

[0071] The present embodiment provides a method for preparing basic chromium sulfate from the raffinate of menadione production, the method comprising the steps of:

[0072] (1) The raffinate of menadione production (the concentration of hexavalent chromium is 66g / L, and hexavalent chromium exists in the form of sodium alum, the concentration of sulfuric acid is 135g / L, and menadione is 0.0003g / L,) is often heated successively for 25 ℃ aging for 48h and plate and frame filtration to obtain the treated liquid;

[0073] (2) Mixing step (1) The treated liquid and the 60-degree red vanadium sodium mother liquor, the obtained mixed material is filtered through a plate and frame, and then subjected to glucose for the first reduction at 105 ° C. After mixing, the material turns from yellow to yellow When it is dark green, use the indicator to test. If the indicator is red, continue to add the reducing agent. When the indicator turns dark purple, you can stop adding the reducing agent...

Embodiment 3

[0077] The present embodiment provides a method for preparing basic chromium sulfate from the raffinate of menadione production, the method comprising the steps of:

[0078] (1) The raffinate of menadione production (the concentration of hexavalent chromium is 62g / L, and hexavalent chromium exists in the form of sodium alum, the concentration of sulfuric acid is 100g / L, and menadione 0.00025g / L,) is often warmed at 25.5 ℃ aging for 120h and plate and frame filtration to obtain the treated liquid;

[0079] (2) Mixing step (1) The treated liquid and 60-degree red vanadium sodium mother liquor, the obtained mixed material is filtered through a plate and frame, and then subjected to glucose for the first reduction of 100 ° C micro-boiling, when the mixed material changes from yellow When it is dark green, use the indicator to test. If the indicator is red, continue to add the reducing agent. When the indicator turns dark purple, you can stop adding the reducing agent for the first...

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Abstract

The invention provides a method for preparing basic chromium sulfate from menadione production raffinate. The method comprises the following steps: (1) sequentially carrying out aging and solid-liquid separation on the menadione production raffinate to obtain treated liquid; (2) mixing the treated liquid obtained in the step (1) with a hexavalent chromium source, sequentially carrying out first reduction and second reduction on the obtained mixed material, and concentrating to obtain reduced feed liquid; and (3) sequentially curing, finely filtering and spray-drying the reduced feed liquid to obtain basic chromium sulfate. According to the method disclosed by the invention, the steps of aging and solid-liquid separation are added before reduction, and a refined filtration mode is selected for reduction, so that the product quality of the basic chromium sulfate is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, in particular to a method for preparing basic chromium sulfate from the raffinate of menadione production. Background technique [0002] The production of traditional basic chromium sulfate is to dissolve sodium red alum in water and add a certain amount of sulfuric acid to mix, then reduce it with glucose to obtain a solution, and then spray the solution to obtain basic chromium sulfate. Because chromium resources are very precious, making full use of precious chromium resources and reducing and eliminating the pollution of chromium to the environment are the roads for the development of chromium salt enterprises. [0003] 2-methyl-1,4-naphthoquinone is an intermediate for the production of feed additive vitamin K3. It is oxidized by the raw material 2-methylnaphthalene and a strong acidic solution of sodium red alum as an oxidant, and 2-methyl-1,4-naphthalene is separated by filt...

Claims

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Application Information

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IPC IPC(8): C01G37/08
CPCC01G37/08C01P2006/80
Inventor 费锦华蔡再华柯愈胜石大学叶文进黄国强马丹胡进杰
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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