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Method for synchronously recovering vanadium and chromium from vanadium-chromium slag by acid process

A vanadium-chromium slag acid method and a vanadium-chromium slag technology are applied in the direction of improving process efficiency, etc., which can solve the problems of low vanadium-chromium separation efficiency, affecting industrialized production, and high production cost, and achieve clean and efficient utilization, production cost reduction, and high production cost. The effect of simplifying the production process

Active Publication Date: 2015-07-29
孟立新
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The method of above-mentioned prior art all adopts the method for extracting vanadium-chromium step by step, but its common defect is that the separation efficiency of vanadium-chromium is low, the flow process is too long, and the production cost is higher, thereby affecting its industrialized production

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  • Method for synchronously recovering vanadium and chromium from vanadium-chromium slag by acid process

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Embodiment 2

[0031] (1) Water washing and desalting: wash the water-soluble salt in 1kg vanadium-chromium slag with 2kg water slurry, the slurry washing temperature is 60 ℃, obtain filter cake 880g and washing liquid respectively after filtering, the washing liquid salt concentration (in Na 2 SO 4 Total) is 25g / L, is used for next time water washing desalting step;

[0032] (2) Oxidation and acid dissolution: the filter cake obtained in step (1) is acid-dissolved in 2.64 kg of 80% sulfuric acid solution. During the acid-dissolution process, sodium chlorate with a slag content of 20% is added for oxygen-enriched acid dissolution. The reaction temperature is 80°C , the reaction process liquid-solid ratio is 3:1, obtains vanadium-chromium solution and tailings;

[0033] (3) Purification and impurity removal: add CaCl to the vanadium-chromium solution obtained in step (2) 2 Impurity removal-desulfurization, the addition amount is Si, P, SO in the solution 4 2- 3 times the total molar weigh...

Embodiment 3

[0037] Example 3: figure 1 Shown, the method processing step of this vanadium chromium slag acid method synchronously reclaiming vanadium chromium is as follows:

[0038] (1) Water washing and desalting: wash the water-soluble salt in 1kg vanadium-chromium slag with 7kg water slurry, the washing temperature is 80 ℃, obtain filter cake 870g and washing liquid respectively after filtering, the washing liquid salt concentration (in Na 2 SO 4 Calculated) is 15g / L, is used for next water washing desalting step;

[0039] (2) Oxidative acid dissolution: the filter cake obtained in step (1) is acid-dissolved in 4.35kg of 50% sulfuric acid solution, and the acid-dissolution process adds potassium permanganate with 10% slag amount to carry out oxygen-enriched acid dissolution, and the reaction temperature is 120 ℃, the liquid-solid ratio in the reaction process is 5:1, and vanadium-chromium solution and tailings are obtained;

[0040] (3) purification and impurity removal: the vanadium...

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Abstract

The invention relates to a method for synchronously recovering vanadium and chromium from vanadium-chromium slag by an acid process. The method comprises the steps: (1) carrying out water-washing desalting: washing water-soluble salts in the vanadium-chromium slag with water, filtrating so as to obtain a filter cake and a washing solution, cyclically washing the washing solution with water, and finally precipitating salts through cooling crystallization; (2) carrying out oxidizing acid-dissolving: adding the filter cake obtained in the step (1) into a sulfuric acid solution for acid dissolving, and adding an oxygen enrichment agent for closed oxygen-enriched leaching during acid dissolving, so as to obtain a vanadium-chromium solution and tailings; (3) carrying out purifying impurity removal: adding a calcium containing compound into the vanadium-chromium solution obtained in the step (2) for impurity removal-desulfurization, so as to obtain a purified vanadium-chromium solution; (4) carrying out calcification vanadium precipitating: adding a calcification agent into the vanadium-chromium solution obtained in the step (3) for calcification vanadium precipitating, so as to obtain calcium vanadate and a vanadium precipitated solution; (5) carrying out hydrolyzing chromium precipitating: reducing the vanadium precipitated solution obtained in the step (4) through a reducing agent, adding alkali to adjust the pH value of the solution to 7-9, precipitating to obtain chromic hydroxide, and calcining to obtain a chrome green product. According to the method provided by the invention, the consumption of additives is reduced, the production process is simplified, the production cost is reduced, and the clean and efficient utilization of the vanadium-chromium slag is realized.

Description

technical field [0001] The invention relates to a method for treating solid waste in the vanadium chemical industry, in particular to a method for synchronously separating and recovering vanadium and chromium from vanadium-chromium reduction waste residue. Background technique [0002] In the existing process of sodium roasting and water leaching vanadium extraction using vanadium slag as raw material, chromium enters the acidic ammonium salt vanadium precipitation process together with vanadium, and together with polyvanadate ions that have not been completely precipitated in the form of dichromic acid Entering the vanadium-precipitating supernatant, the vanadium-precipitating wastewater is formed. At present, the commonly used method for treating vanadium precipitation wastewater is the "reduction-neutralization-concentration or freeze crystallization" method. The high-valence vanadium and chromium in the vanadium precipitation wastewater are reduced, then neutralized by ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 孟立新
Owner 孟立新
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