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Method for producing high-purity ammonium metavanadate by deeply removing cobalt from vanadium raw material

An ammonium metavanadate and raw material technology is applied in the field of deep cobalt removal from vanadium raw materials to produce high-purity ammonium metavanadate, which can solve problems such as difficulty in removing cobalt, and achieve the effects of pure color, environmental friendliness and wide application range.

Pending Publication Date: 2022-04-12
大连融科储能集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The object of the present invention is to, aiming at the difficult problem of removing cobalt from traditional vanadium raw materials, propose a method for deep removal of cobalt from vanadium raw materials to produce high-purity ammonium metavanadate, which can carry out deep removal of cobalt from cobalt-containing vanadium raw materials, and prepare Obtain high-purity ammonium metavanadate product

Method used

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  • Method for producing high-purity ammonium metavanadate by deeply removing cobalt from vanadium raw material
  • Method for producing high-purity ammonium metavanadate by deeply removing cobalt from vanadium raw material
  • Method for producing high-purity ammonium metavanadate by deeply removing cobalt from vanadium raw material

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Embodiment 1

[0044] This embodiment discloses a method for deep removal of cobalt from vanadium raw materials to produce high-purity ammonium metavanadate, comprising the following steps:

[0045] Step 1. Take 50g of sodium hydroxide and add it to 500mL of water, then add 30g of aluminum sulfate, stir and heat up to 80°C, the pH of the solution is 13; add 1g of sodium sulfide;

[0046] Step 2. Add 100 g of cobalt-containing raw material ammonium metavanadate (purchased from South Africa, Co 0.05%, the specific content is shown in Table 1) to the solution, stir for 2 hours, pH=9.0, and filter to obtain the filtrate (first filtrate) and filter residue . The vanadium concentration in the filtrate is 130.26g / L, the cobalt concentration is 2.2mg / L, and the cobalt removal rate is 97%; the filter residue is used for the next cycle.

[0047] Step 3. Keep the temperature of the filtrate at 60°C, add water to dilute the filtrate to 800mL, add sulfuric acid to adjust the pH to 8.0, add 0.2g sodium s...

Embodiment 2

[0061] This embodiment discloses a method for deep cobalt removal to produce high-purity ammonium metavanadate, comprising the following steps:

[0062] Step 1. Take 50g of sodium hydroxide, 10g of sodium carbonate and add 700mL of water, then add 20g of aluminum chloride and 10g of sodium silicate, stir and heat up to 90°C, the pH of the solution is 14; add 1.4g of vanadium dioxide;

[0063] Step 2, add 115g of cobalt-containing raw material ammonium polyvanadate (purchased from South Africa, Co 0.1%, the specific content is shown in Table 5), stir for 3 hours, pH8.5, filter to obtain the filtrate (first filtrate) and filter residue. The vanadium concentration in the filtrate is 128.89g / L, the cobalt concentration is 4.5mg / L, and the cobalt removal rate is 98%; the filter residue is used for the next cycle;

[0064] Step 3. Keep the temperature of the filtrate at 50°C, add water to dilute the filtrate to 1.1L, add sulfuric acid to adjust the pH to 7.5, add 0.55g of ferrous am...

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Abstract

The invention provides a method for producing high-purity ammonium metavanadate by deeply removing cobalt from a vanadium raw material, which comprises the following steps: in an alkaline environment, firstly adding a precipitator, then adding a reducing agent, finally adding a metallurgical-grade cobalt-vanadium-containing raw material, adjusting alkalinity to fully dissolve vanadium and cobalt, adding the reducing agent under a high-temperature condition to reduce trivalent cobalt ions in the solution to divalent cobalt ions, thereby obtaining the high-purity ammonium metavanadate. Coprecipitation with a precipitant is carried out in the form of cobalt hydroxide, so that most cobalt can be removed; after solid-liquid separation, acid is added to adjust the solution to be alkalescent, a reducing agent and a precipitating agent are added for secondary cobalt removal, cooling and standing are carried out, supernatant obtained after standing is taken and added with EDTA-2Na for complexing divalent cobalt ions, a stable chelate is formed, cobalt is further deeply removed, ammonium salt is added to produce ammonium metavanadate (AMV), and the cobalt content in ammonium metavanadate does not exceed 2 ppm. According to the method, the cobalt can be deeply removed from the vanadium raw material containing cobalt, and the high-purity ammonium metavanadate product is prepared.

Description

technical field [0001] The invention relates to cobalt removal technology, which relates to a method for deep cobalt removal of vanadium raw materials to produce high-purity ammonium metavanadate. Background technique [0002] High-purity ammonium metavanadate refers to ammonium metavanadate with extremely low impurity content and high purity. It is a high-end product in the market and is mainly used in the production of catalysts and vanadium battery electrolytes. It has extremely high requirements for various impurity elements. [0003] Vanadium-containing iron ore is widely distributed in the world, such as Chengde and Panzhihua in China, South Africa, Russia, Australia and other countries have rich mineral deposits. The steel slag produced when vanadium-titanium magnetite is used for steelmaking is a common vanadium-containing raw material. It has high vanadium content and stable supply. It is a rare and stable vanadium raw material. The APV, AMV or flake vanadium raw m...

Claims

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Application Information

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IPC IPC(8): C01G31/00C22B7/00C22B34/22
CPCY02P10/20
Inventor 杨洪殷源王隆菲
Owner 大连融科储能集团股份有限公司
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