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Method for resource utilization of chromium-containing sodium hydrogen sulfate

A technology of sodium bisulfate and resource utilization, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal sulfite/sulfate purification, etc., can solve the problem of high roasting temperature, limited product purity, The problems such as the complex composition of chromium-containing sodium bisulfate can achieve the effects of simple process, low cost, good economic benefits and application prospects

Pending Publication Date: 2020-12-29
HUBEI ZHENHUA CHEMICAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method has a high roasting temperature, relatively high energy consumption, and complex components of chromium-containing sodium bisulfate, resulting in limited product purity.
[0005] CN 104445284A discloses a method for separating and recovering anhydrous sodium sulfate, concentrated sulfuric acid and chromium from chromium-containing sodium hydrogensulfate. In the method, the chromium-containing sodium hydrogensulfate is subjected to heat preservation treatment, then placed in alcohol for countercurrent extraction and filtered to form The mixed solution of alcohol, sulfuric acid and solid chromium-containing sodium sulfate, the mixed solution of alcohol and sulfuric acid is evaporated, the sulfuric acid and alcohol are separated, and the solid chromium-containing sodium sulfate is leached and filtered to obtain sodium sulfate solution and chromium-containing filter cake. Separation of components in chromium sodium bisulfate without harmless treatment, the added value of the product is limited

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  • Method for resource utilization of chromium-containing sodium hydrogen sulfate

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Embodiment 1

[0073] This embodiment provides a method for resource utilization of chromium-containing sodium bisulfate, the process flow diagram of the method is as follows figure 1 shown, including the following steps:

[0074] (1) Dissolve 1000g of chromium-containing sodium bisulfate with 4L of water for 4h at 30°C. The chromium-containing sodium bisulfate is a by-product of the production of chromic anhydride by melt crystallization, and the hexavalent chromium is represented by Na 2 Cr 2 o 7 2H 2 O content is 3wt%, soluble trivalent chromium is Cr 2 o 3 The calculated content is 0.5wt%. Filter to obtain hexavalent chromium-containing filtrate and chromium-containing filter cake, add 32g of sodium bisulfite to the hexavalent chromium-containing filtrate, and react at 40°C for 2h to obtain trivalent chromium-containing sulfuric acid sodium hydrogen solution;

[0075] (2) Add 540 g of chromium ion-imprinted polymer to the solution obtained in step (1), adsorb for 1 hour at 40° C., ...

Embodiment 2

[0080] This embodiment provides a method for resource utilization of chromium-containing sodium bisulfate, said method comprising the following steps:

[0081] (1) Dissolve 1000g of chromium-containing sodium bisulfate with 5L of water for 3h at 50°C. The chromium-containing sodium bisulfate is a by-product of chromic anhydride produced by the solution crystallization method, wherein the hexavalent chromium is represented by Na 2 Cr 2 o 7 2H 2 O content is 2.5wt%, filter to obtain hexavalent chromium-containing filtrate and chromium-containing filter cake, add sodium sulfite 35g to the hexavalent chromium-containing filtrate, and react at 60°C for 1.2h to obtain trivalent chromium-containing hydrogen sulfate sodium solution;

[0082] (2) Add 460 g of chromium ion non-imprinting polymer to the solution obtained in step (1), adsorb at 60° C. for 0.8 h, and filter to obtain chromium-containing adsorbent and chromium-free sodium bisulfate solution;

[0083] (3) the chromium-co...

Embodiment 3

[0087] This embodiment provides a method for resource utilization of chromium-containing sodium bisulfate, said method comprising the following steps:

[0088] (1) Dissolve 1000g of chromium-containing sodium bisulfate with 3L of water for 2.5h at 60°C. The chromium-containing sodium bisulfate is a by-product of chromic anhydride produced by melting crystallization, and the hexavalent chromium is represented by Na 2 Cr 2 o 7 2H 2 O content is 2wt%, soluble trivalent chromium is Cr 2 o 3 The calculated content is 1wt%, and the hexavalent chromium-containing filtrate and chromium-containing filter cake are obtained by filtration, and a total of 25 g of sodium sulfite and sodium bisulfite are added to the hexavalent chromium-containing filtrate, and reacted at 80 ° C for 1 hour to obtain trivalent chromium-containing Sodium bisulfate solution;

[0089] (2) Add 100g of ion exchange resin to the solution obtained in step (1), adsorb for 0.5h at 80°C, filter to obtain chromium-...

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Abstract

The invention provides a method for resource utilization of chromium-containing sodium hydrogen sulfate, which comprises the following steps: dissolving chromium-containing sodium hydrogen sulfate, carrying out solid-liquid separation, and adding a reducing agent into the obtained liquid phase for reaction; and mixing the reacted solution with an adsorbent for adsorbing, carrying out solid-liquidseparation, and and evaporating, cooling and crystallizing the obtained liquid phase to obtain anhydrous sodium hydrogen sulfate. According to the method, chromium in the chromium-containing sodium hydrogen sulfate is reduced and selectively adsorbed, so that components in the chromium-containing sodium hydrogen sulfate are separated, chromium is subjected to harmless treatment, sodium hydrogen sulfate salt is purified, and the purity of the anhydrous sodium hydrogen sulfate product can reach 98% or above, the purity of the further prepared sodium pyrosulfate reaches 95% or above, and the added value of the products is high; and the method is simple in process, the adsorbent can be regenerated and recycled, the operation and raw material cost is low, and good economic benefits and application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and relates to a method for resource utilization of chromium-containing sodium bisulfate. Background technique [0002] Chromium-containing sodium bisulfate is one of the solid wastes produced by the traditional chromium salt industry. About 1.3 tons of chromium-containing sodium bisulfate can be produced for every ton of chromic anhydride produced. The chromium mainly exists in the form of hexavalent chromium, which is highly toxic. , and the acid value is high, strong corrosion; sodium bisulfate can be used as dyeing aids, cleaning agents, preservatives and acidifiers, etc. waste. Based on the above-mentioned characteristics of chromium-containing sodium bisulfate, it is necessary to carry out its harmless treatment and resource utilization. [0003] At present, the most common utilization method of chromium-containing sodium bisulfate is the comprehensive recycling method, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C01D5/00
CPCC01D5/16C01D5/00C01P2006/80
Inventor 裴丽丽程西川庆朋辉段静张红玲石大学徐红彬候礼强张懿陈劲松商琴廖荣
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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