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Method for removing phosphorus from chromium oxide

A technology of chromium oxide and slurrying, which is applied in the direction of chromium oxide/hydrate, etc., can solve the problems of complex solution system and phosphorus removal method that cannot be directly applied to chromium oxide phosphorus removal process, and achieve no wastewater discharge, high efficiency, and The effect of high phosphorus efficiency

Inactive Publication Date: 2018-04-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the above method is that the phosphorus removal process will often introduce new impurities, which will complicate the solution system
[0004] Commonly used phosphorus removal methods cannot be directly applied to the chromium oxide phosphorus removal process

Method used

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  • Method for removing phosphorus from chromium oxide

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Effect test

Embodiment 1

[0028] This embodiment provides a method for removing phosphorus by chromium oxide, said method comprising the following steps:

[0029] (1) chromium oxide and the solution after adsorption of step (3) are mixed and slurried, and hydrochloric acid is slowly added to adjust the pH to 1, and the leaching of phosphorus in chromium oxide is realized at 20° C., and filtered after leaching to obtain phosphorus leachate and Chromium oxide filter cake for phosphorus removal;

[0030] (2) drying the phosphorus-removing chromium oxide filter cake obtained in step (1) to obtain the phosphorus-removing chromium oxide product;

[0031] (3) Using cerium hydroxide to adsorb phosphorus in the leaching solution at 40° C., and returning the solution to step (1) after adsorption.

[0032] After the above steps, the phosphorus content in the chromium oxide is reduced to below 0.003%.

Embodiment 2

[0034] This embodiment provides a method for removing phosphorus by chromium oxide, said method comprising the following steps:

[0035] (1) chromium oxide and the solution after adsorption of step (3) are mixed and slurried, and hydrochloric acid is slowly added to adjust the pH to 1.5, and the leaching of phosphorus in chromium oxide is realized at 40 ° C. After leaching, filter to obtain phosphorus leachate and Chromium oxide filter cake for phosphorus removal;

[0036] (2) drying the phosphorus-removing chromium oxide filter cake obtained in step (1) to obtain the phosphorus-removing chromium oxide product;

[0037] (3) Using antimony trichloride to adsorb phosphorus in the leachate at 70° C., and return the solution to step (1) after adsorption.

[0038] After the above steps, the phosphorus content in the chromium oxide is reduced to below 0.003%.

Embodiment 3

[0040] This embodiment provides a method for removing phosphorus by chromium oxide, said method comprising the following steps:

[0041] (1) chromium oxide and the solution after adsorption of step (3) are mixed and slurried, and hydrochloric acid is slowly added to adjust the pH to 2.5, and the leaching of phosphorus in chromium oxide is realized at 60° C., and filtered after leaching to obtain phosphorus leachate and Chromium oxide filter cake for phosphorus removal;

[0042] (2) drying the phosphorus-removing chromium oxide filter cake obtained in step (1) to obtain the phosphorus-removing chromium oxide product;

[0043] (3) Using antimony trichloride to adsorb phosphorus in the leachate at 90° C., and return the solution to step (1) after adsorption.

[0044] After the above steps, the phosphorus content in the chromium oxide is reduced to below 0.003%.

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Abstract

The invention provides a method for removing phosphorus from chromium oxide. The method comprises the following steps: (1) mixing and slurrying the chromium oxide and a returned adsorbed solution, slowly adding a strong acid to adjust the pH value of the obtained solution to be less than 7, and leaching the phosphorus from the chromium oxide at an appropriate temperature to respectively obtain a phosphorus leachate and a phosphorus-removed chromium oxide filter cake; (2) drying the phosphorus-removed chromium oxide filter cake to obtain a phosphorus-removed chromium oxide product; and (3) adsorbing phosphorus in the phosphorus leachate at a certain temperature by adopting an adsorbent, and returning the adsorbed solution to the chromium oxide leaching phosphorus removal process. The methodhas the advantages of simple flow, mild conditions, high phosphorus removal efficiency, and realization of the phosphorus content in the phosphorus-removed chromium oxide product to be less than 0.003%.

Description

technical field [0001] The invention belongs to a hydrometallurgical process and relates to a method for removing phosphorus by chromium oxide. Background technique [0002] Chromium oxide is an important chromium product widely used in metallurgy, chemical industry and other fields, among which smelting metal chromium is the main application of chromium oxide. The quality of metal chromium products has strict requirements on phosphorus. The national standard for metal chromium (GB / T3211-2008) clearly requires that the phosphorus in metal chromium should be less than 0.01%. This requires strict control of phosphorus content in chromium oxide as an upstream raw material. Raw materials for preparing chromium oxide, such as chromite, chromium-containing waste residue, etc. (electroplating sludge and by-product vanadium-chromium slag in the vanadium chemical industry, etc.), often contain a small amount of phosphorus; This leads to the accumulation of phosphorus in the system ...

Claims

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Application Information

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IPC IPC(8): C01G37/02
CPCC01G37/02C01P2006/80
Inventor 张洋郑诗礼陈晓芳乔珊王晓健范兵强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI