Recovery method of valuable metal in vanadium chromium slag

A technology of valuable metals and recovery methods, applied in the field of metallurgy, can solve problems such as the inability to achieve economical and efficient separation and extraction of vanadium and chromium, and chromium pollution, and achieve the effects of fast reaction rate, low operating temperature, and low energy consumption

Inactive Publication Date: 2019-06-11
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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Problems solved by technology

Many scholars have conducted various studies on the comprehensive utilization of vanadium extraction tailings, mainly focusing on extracting residual vanadium, iron, titanium, and gallium from vanadium extraction tailings, preparing vanadium-titanium black porcelain building materials, far-infrared coatings, and converter manufacturing. slag agent, etc., but the problem of chromium pollution has not been solved
However, at the present stage, neither in the roasting and leaching process of vanadium-chromium slag nor in the vanadium-chromium leaching solution, it is impossible to realize the separation and extraction of vanadium-chromium in vanadium-chromium slag economically and efficiently, not to mention the titanium resources in tailings

Method used

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  • Recovery method of valuable metal in vanadium chromium slag
  • Recovery method of valuable metal in vanadium chromium slag

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Embodiment

[0030] Example: see figure 1 A method for recovering valuable metals in vanadium-chromium slag, comprising the following steps:

[0031] Using vanadium chromium slag as raw material, the process method of the invention is used to recover valuable metals. The percentages of valuable elements in the vanadium-chromium slag raw materials are as follows: V 7.57%, Cr 4.04%, Fe 28.0%, Ti 8.76%, Si 5.97%, Mn4.26%, Ca 2.14%, Mg 1.62%, Al 1.69%.

[0032] S1: Mix the fine powder of vanadium with 10% NH in the fluidized bed 3 , 90%N 2 The mixed gas reacts for 4 hours, and the operating temperature is 1200°C. Specifically, 900°C, 950°C, 1300°C or 1400°C can be selected, and the primary material of vanadium chromium nitride slag is obtained by cooling. The slag contains 75% V, 68% Cr, 90% of Ti is nitrided and 99% of Fe is reduced to metallic iron and iron nitride.

[0033] S2: The above-mentioned vanadium chromium nitride slag primary material is fully ball milled in a ball mill, and ...

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Abstract

The invention relates to a recovery method of valuable metal in vanadium chromium slag. According to the method, vanadium chromium slag fine powder and mixed gas mainly dominated by NH3+N2 are subjected to reduction and nitridation to obtain a vanadium chromium nitride slag primary material; then metal iron is removed through ball milling magnetic separation, so that non-magnetic nitridation slagis obtained; then the non-magnetic nitridation slag and chlorine react in a fluidized bed at a low temperature, thus TiN, VN, V2O3 and the like and chlorine react to generate chloride, and chromium chloride is left in the chlorination tailings to obtain chromium-contained chlorination tailings; then after high-boiling-point and low-boiling-point impurities in the chloride are removed, separation is carried out so that pure VOC13 and TiC14 products are obtained; and finally, the chromium-contained chlorination tailings are subjected to the working procedures of leaching out, neutralizing chromium depositing, calcining and the like, so that a Cr2O3 product is obtained. The method achieves comprehensive recovery and utilization of valuable metal iron, chromium, vanadium and titanium in the vanadium chromium slag, and has the characteristics of being high in comprehensive recovery rate, clean and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering valuable metals in vanadium-chromium slag. Background technique [0002] Chromium, vanadium, and titanium are all valuable accompanying elements in high-chromium vanadium-titanium magnetite, and vanadium-titanium magnetite is composed of ilmenite and titanomagnetite. Vanadium and chromium mainly occur in titanomagnetite. Because vanadium and chromium are similar in nature, vanadium and chromium are simultaneously oxidized into vanadium slag while blowing vanadium-containing molten iron, and chromium-containing vanadium slag is obtained. [0003] Because the economic value of vanadium is higher than that of chromium, most of the production processes of vanadium chemical products at home and abroad are aimed at the extraction of vanadium from slag, mainly including sodium roasting vanadium extraction process and calcification roasting vanadiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/00C22B34/32C22B34/22C22B34/12C21B13/00C01G31/02C01G37/033
CPCY02P10/20
Inventor 黄青云向俊一吕学伟裴贵尚王鑫吕炜张宇游志雄
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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