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Recovery method of vanadium-containing neutralizing slag

A recovery method and calcium-enriched technology, applied in the field of waste treatment, can solve problems such as vanadium pollution, and achieve the effects of enhancing the leaching rate, simplifying the preparation process, and saving fresh water resources.

Active Publication Date: 2019-04-23
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a recovery method for vanadium-containing neutralization slag, which solves the problem that vanadium-containing neutralization slag is harmful to the environment due to the fact that the discharge of vanadium-containing neutralization slag is increasing year by year but cannot be used reasonably and effectively. At the same time, the high value-added resource utilization of calcium-rich slag and vanadium in vanadium-containing neutralization slag is realized

Method used

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  • Recovery method of vanadium-containing neutralizing slag
  • Recovery method of vanadium-containing neutralizing slag
  • Recovery method of vanadium-containing neutralizing slag

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Embodiment 1～4

[0041] Crushing, grinding and drying vanadium-containing neutralized slag and calcium-rich slag, the particle size is below 37 μm;

[0042] The main chemical composition of vanadium-containing neutralization slag is shown in Table 1.

[0043] Table 1

[0044]

Embodiment 1

[0046] This embodiment discloses a method for recovering vanadium-containing neutralized slag, comprising the following steps:

[0047] Step (1) Weigh 1000g of vanadium-containing neutralization slag, 60g of 94%wt concentrated sulfuric acid and 800g of water, and mix them uniformly to obtain a suspension;

[0048] Step (2) Place the suspension in an Erlenmeyer flask, heat and stir, and add 15 g of anhydrous sodium sulfite to the reaction vessel, and perform reduction leaching for 120 min at a reduction leaching temperature of 80° C. and a stirring speed of 200 r / min;

[0049] Step (3) After the slurry after reduction leaching is separated from solid and liquid, wash the filter residue with 1000 g of sodium sulfate solution with a concentration of 5% wt to obtain vanadium-containing leaching solution and calcium-rich slag. After testing, the concentration of vanadium in the vanadium-containing leaching solution is 6.08 g / L, the leaching rate of vanadium is as high as 99.5%, and...

Embodiment 2

[0056] This embodiment discloses a method for recovering vanadium-containing neutralized slag, the steps (1)-(5) of which are the same as in Example 1, and also include the following steps:

[0057] Step (6) Weigh 50g of calcium-rich slag obtained in step (3), 500g of seawater, 8g of anhydrous sodium carbonate, 8g of anhydrous magnesium carbonate and 40g of industrial hydrochloric acid, and mix them uniformly to obtain a suspension. Stir for 120min;

[0058] Step (7) solid-liquid separation can obtain 520ml mother liquor, add 2.5g sodium dodecyl sulfonate in mother liquor, 5g concentration is the concentrated sulfuric acid of 92%, 0.4g calcium sulfate dihydrate crystal, at temperature is 101 ℃, stirs Respond for 2 hours at a speed of 100r / min;

[0059] Step (8) Filter the obtained slurry while it is hot, rinse the filter cake with clean water, and dry the filter cake in a constant temperature drying oven at 180°C for 4 hours to obtain anhydrous calcium sulfate whiskers, which...

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Abstract

The invention provides a recovery method of vanadium-containing neutralizing slag. The recovery method comprises the following steps of mixing the vanadium-containing neutralizing slag, concentrated sulfuric acid and water to obtain slurry; adding a reducing agent in the slurry, and performing reduction leaching; performing solid-liquid separation on the slurry obtained after reduction leaching, and cleaning filter residue with a sodium sulfate solution to obtain a vanadium-containing leaching solution and calcium-rich slag; adding ammonium sulfate in the vanadium-containing leaching solution,regulating the pH value of the leaching solution with ammonia water, performing cooling crystallization, and performing solid-liquid separation to obtain an ammonium alum crystal and a neutralizationsolution; and performing counter-current extraction, counter-current back extraction, upflow regeneration and counter-current washing on the neutralization solution, thereby obtaining a high-purity vanadyl sulfate solution. According to the recovery method, when the pollution of a vanadium element in the vanadium-containing neutralizing slag to environment is solved, the high value-added resourceutilization of the calcium-rich slag and the vanadium element in the vanadium-containing neutralizing slag is realized.

Description

technical field [0001] The invention relates to waste treatment technology, in particular to a method for recovering vanadium-containing neutralized slag. Background technique [0002] Vanadium is an important strategic resource for national defense, and it can be called "the vitamin of industry". It is widely used in the fields of steel, alloy, chemical industry, medicine, atomic energy and vanadium battery. There are more than 70 kinds of vanadium minerals in nature, which are mainly symbiotic with other metal ores. So far, no independent vanadium minerals have been found. 88% of the annual output of vanadium comes from vanadium-titanium magnetite ore. my country's vanadium-titanium magnetite and vanadium-containing stone coal resources are relatively rich, and vanadium-containing stone coal mines are another major vanadium ore resource in my country, containing V 2 o 5 Accounting for 87% of my country's total reserves, it is V in my country's vanadium-titanium magnetite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B26/20C30B29/46C30B7/14C01F7/76
CPCC01F7/762C22B7/007C22B26/20C22B34/22C30B7/14C30B29/46Y02P10/20
Inventor 孟昭扬曾繁武杨洪
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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