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Technical method of directly separating vanadium and chromium from sodium modification vanadium extraction waste water

A technique for extracting vanadium by sodium and a process method, which is applied in the field of direct separation of vanadium and chromium, which can solve the problems of long vanadium and chromium separation process, large production safety hazards, and large amount of impurity remover, so as to achieve strong continuity and reduce processing costs , the effect of ensuring safety

Inactive Publication Date: 2018-04-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the separation of vanadium and chromium can be achieved, and chromium oxide and vanadium-containing solution can be obtained respectively; the disadvantage is that the separation process of vanadium and chromium is long, the amount of acid, alkali, oxidant, and impurity remover is large, the treatment cost is high, and the operation process is under high temperature conditions. , production safety hazards are relatively large

Method used

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  • Technical method of directly separating vanadium and chromium from sodium modification vanadium extraction waste water
  • Technical method of directly separating vanadium and chromium from sodium modification vanadium extraction waste water
  • Technical method of directly separating vanadium and chromium from sodium modification vanadium extraction waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Addition test of impurity remover

[0023] In the laboratory, the test to determine the amount of impurity remover added was carried out, and the same amount was added to the test to detect the effect of impurity removal; the experimental results are as follows:

[0024]

[0025] According to the test results, it is determined that the optimal amount of impurity remover added is 4ml / l.

Embodiment 2

[0027] Determination of pH value of vanadium silicon precipitation

[0028] In the laboratory, vanadium and silicon precipitation tests were carried out under different pH conditions. The test results are as follows:

[0029]

[0030] The test results show that the optimal pH of vanadium-silicon co-precipitation is 4.5-5.

Embodiment 3

[0032] Determination of pH Value of Chromium Hydroxide Precipitation

[0033] In the laboratory, precipitation tests were carried out under different pH conditions; the test results are as follows:

[0034]

[0035]

[0036] The test results show that the optimum pH for chromium hydroxide precipitation is 7.5-8.

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Abstract

The invention discloses a technical method, and especially discloses a technical method of directly separating vanadium and chromium from sodium modification vanadium extraction waste water, and belongs to the technical field of environment-friendly production process of metallurgy. The method is short in process route and low in processing cost, and has strong processing continuity. The method includes the steps of: flocculating and precipitating vanadium under acidic conditions, and reducing chromium (IV) into chromium (III), and precipitating the chromium under alkaline conditions to complete the direct separation of the vanadium and chromium from the sodium modification vanadium extraction waste water, wherein the processes of flocculating and precipitating vanadium and reducing and precipitating the chromium each includes steps of: allowing mixed solutions to stand, precipitating the solutions, and performing solid-liquid separation.

Description

technical field [0001] The invention relates to a process method, in particular to a process method for directly separating vanadium and chromium in sodium vanadium extraction wastewater, and belongs to the technical field of metallurgical environmental protection production process. Background technique [0002] At present, most domestic vanadium extraction manufacturers in China reduce and settle the vanadium and chromium in the waste water through GBS to obtain vanadium and chromium co-sedimentation, and then obtain vanadium (III) chromium (III) liquid by acid dissolution. According to (III) chromium (III) Reduction potential difference, vanadium (III) is oxidized to vanadium (V), chromium (III) is added with alkali to precipitate to prepare chromium hydroxide, chromium hydroxide is washed and calcined to prepare chromium oxide, and the chromium precipitation filtrate is used as vanadium-containing Raw materials are returned to the main process flow. The advantage of thi...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/001C02F1/5236C02F1/66C02F1/72C02F9/00C02F2001/007
Inventor 张景垒阳露波刘昌林
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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