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Method for leaching vanadium, titanium and chromium from vanadium, titanium and chromium raw materials by hydrothermal organic acid

A technology of organic acid and hydrothermal method, which is applied in the field of metallurgy, can solve the problems of no co-extraction and difficult production of titanium dioxide, and achieve the effects of high-efficiency co-extraction, universal raw material applicability, and low energy consumption

Active Publication Date: 2020-04-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has certain limitations: (1) the raw material processed by this method is a mineral containing vanadium-iron spinel; (2) this method is only aimed at the extraction of vanadium element, and does not realize the synergistic extraction of other important elements, such as: titanium, chromium
High-grade titanium concentrate can be used to prepare titanium dioxide and high-grade titanium slag by sulfuric acid method, but it is difficult to directly produce titanium dioxide or high-grade titanium slag from low-grade titanium concentrate by sulfuric acid method

Method used

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  • Method for leaching vanadium, titanium and chromium from vanadium, titanium and chromium raw materials by hydrothermal organic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 1.25g of vanadium slag, the concentration is 30% oxalic acid solution, the liquid-solid ratio is 20:1, mix it into a slurry, and add it into the reaction kettle. Reaction conditions: the reaction temperature is 125°C, the reaction time is 3h, the reaction pressure is 0.3-0.9MPa, and the stirring speed is 500r / min. After the reaction is finished, the reactant is cooled to room temperature, filtered and washed to obtain a leaching solution containing vanadium, titanium and chromium, ferrous oxalate and leaching residue. Through centrifugal separation, the ferrous oxalate and the leaching residue are fully separated.

[0039] After ICP-AES detection, in the obtained leaching solution, the V leaching rate was 98.3%, the Ti leaching rate was 98%, and the Cr leaching rate was 96.5%. The separation rate of ferrous oxalate and leaching residue is 95%.

Embodiment 2

[0041] (1) Weigh 1.25g of vanadium slag, the concentration is 15% oxalic acid and 10% formic acid solution, the liquid-solid ratio is 15:1, mix it into a slurry, and add it into the reaction kettle. Reaction conditions: the reaction temperature is 130°C, the reaction time is 2.5h, the reaction pressure is 0.3-0.7MPa, and the stirring speed is 500r / min. After the reaction is finished, the reactant is cooled to room temperature, filtered and washed to obtain a leaching solution containing vanadium, titanium and chromium, ferrous oxalate and leaching residue. Through centrifugal separation, the ferrous oxalate and the leaching residue are fully separated.

[0042] After ICP-AES detection, in the obtained leaching solution, the V leaching rate was 97.5%, the Ti leaching rate was 97%, and the Cr leaching rate was 95.8%. The separation rate of ferrous oxalate and leaching residue is 96%.

Embodiment 3

[0044] (1) Weigh 1.25g of vanadium slag, the concentration is 10% oxalic acid, 5% formic acid and 10% citric acid solution, the liquid-solid ratio is 20:1, mix it into a slurry, and add it into the reaction kettle. Reaction conditions: the reaction temperature is 135°C, the reaction time is 4h, the reaction pressure is 1-2.0MPa, and the stirring speed is 500r / min. After the reaction is finished, the reactant is cooled to room temperature, filtered and washed to obtain a leaching solution containing vanadium, titanium and chromium, ferrous oxalate and leaching residue. Through centrifugal separation, the ferrous oxalate and the leaching residue are fully separated.

[0045] After ICP-AES detection, in the obtained leaching solution, the V leaching rate was 98.2%, the Ti leaching rate was 97.5%, and the Cr leaching rate was 96.3%. The separation rate of ferrous oxalate and leaching residue is 96%.

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Abstract

The invention provides a method for leaching vanadium, titanium and chromium from vanadium, titanium and chromium raw materials by hydrothermal organic acid, and belongs to the technical field of metallurgy. The method comprises the steps that vanadium slag, extracted vanadium tailings, vanadium slag-extracted vanadium tailing mixed slag and titanium concentrate are used as raw materials, and organic acid is used as a leaching agent for hydrothermal reaction in a reactor. The vanadium slag, the extracted vanadium tailings and the vanadium slag-extracted vanadium tailing mixed slag are correspondingly leached by the organic acid to obtain an element solution containing vanadium, titanium and chromium and ferrous oxalate; and the titanium concentrate is leached by the organic acid to obtaina solution contacting titanium and ferrous oxalate. According to the method, the acidity and the high complexing ability of the organic acid are utilized to destroy a phase containing vanadium, titanium and chromium, the complex reaction is generated to form a complex ion solution of [V(C2O4)3]3-, [Ti(C2O4)3]3- and [Cr(C2O4)3]3-, and the efficient leaching of vanadium, titanium and chromium elements is achieved; in addition, the method is simple in process and environment-friendly; the added value of the ferrous oxalate is high; and used equipment is common, the energy consumption is low, anda good application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for leaching vanadium, titanium and chromium in raw materials of vanadium, titanium and chromium by a hydrothermal method with an organic acid. Background technique [0002] Vanadium slag is a by-product in the smelting process of vanadium-titanium magnetite, and it is one of the main raw materials for the production of vanadium products. According to the difference of vanadium content in vanadium slag, it can be divided into high-grade vanadium slag and low-grade vanadium slag. According to the difference of chromium grade in vanadium slag, it can be divided into high chromium vanadium slag and low chromium vanadium slag. According to the difference of calcium grade in vanadium slag, it can be divided into high calcium vanadium slag and low calcium vanadium slag. At present, vanadium slag vanadium extraction process mainly includes sodium roasting-water leaching va...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B34/12C22B34/22C22B34/32
CPCC22B3/165C22B34/124C22B34/22C22B34/32Y02P10/20
Inventor 闫柏军董自慧陈学鑫
Owner UNIV OF SCI & TECH BEIJING
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