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Method and system for treating vanadium slag

A technology for vanadium slag and vanadium precipitation, applied to the system implementing the method, in the field of vanadium slag treatment, can solve problems such as iron recovery and waste of resources, and is suitable for continuous large-scale production, recovery rate improvement, and realization of easy effect

Inactive Publication Date: 2016-11-02
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, although the prior art adopts many methods for the treatment of vanadium slag, such as sodium oxide roasting, calcification roasting, wet direct treatment, chlorination roasting, molten state direct treatment, etc., the recovery of iron is not considered. cause waste of resources

Method used

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  • Method and system for treating vanadium slag

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Effect test

Embodiment 1

[0041] Embodiment 1 handles the method for vanadium slag

[0042] The vanadium slag (containing 35% of total iron and 16% of vanadium pentoxide) of a vanadium extraction and steelmaking plant in China was subjected to oxidation and magnetization roasting treatment in a rotary kiln at a temperature of 300°C, an oxygen concentration of 0.5%, and a roasting time of 5 minutes to obtain magnetic roasting Sand, wherein the iron in the ferroferric oxide accounts for 92% of the total iron; in the magnetic separation device (magnetic separator), the magnetic calcine is magnetically separated to obtain magnetic ferroferric oxide and vanadium-rich slag, and the iron is recovered Rate 90%. Vanadium-rich slag and calcium carbonate (analytical purity, content 99.5%) are mixed according to the weight ratio of vanadium-rich slag: calcium carbonate = 100:30, and the mixture is added to the tunnel kiln for calcification roasting and smelting. The smelting temperature is 800 ° C. The calcinatio...

Embodiment 2

[0043] Embodiment 2 handles the method for vanadium slag

[0044] The vanadium slag (containing 42% of total iron and 20% of vanadium pentoxide) of a vanadium extraction steelmaking plant in China was subjected to oxidation and magnetization roasting treatment in a rotary hearth furnace at a temperature of 400°C, an oxygen concentration of 1%, and a roasting time of 10 minutes to obtain magnetic Calcined sand, wherein the iron in ferroferric oxide accounts for 90% of the total iron; magnetically separates the magnetic calcined sand in a magnetic separation device (magnetic separator) to obtain magnetic ferroferric oxide and vanadium-rich slag, iron The recovery rate was 92%. Vanadium-rich slag and calcium oxide (analytically pure, content 99.5%) are mixed according to the weight ratio of vanadium-rich slag: calcium oxide = 100:5, and the mixture is added to the rotary kiln for calcification roasting and smelting. The smelting temperature is 1000 ° C. The calcination time is 2...

Embodiment 3

[0045] Embodiment 3 handles the method for vanadium slag

[0046] The vanadium slag (containing 25% of total iron and 14% of vanadium pentoxide) from a vanadium extraction and steelmaking plant in China was oxidized and magnetized roasted in a rotary hearth furnace at a temperature of 500°C, an oxygen concentration of 1.5%, and a roasting time of 15 minutes to obtain a magnetic Calcined sand, wherein the iron in ferroferric oxide accounts for 94% of the total iron; the magnetic calcined sand is magnetically separated in a magnetic separation device (magnetic separation tube) to obtain magnetic ferroferric oxide and vanadium-rich slag, iron The recovery rate is 95%. Vanadium-rich slag and calcium hydroxide (analytically pure, content 99.5%) are mixed according to the weight ratio of vanadium-rich slag: calcium hydroxide = 100:15, and the mixture is added to the rotary kiln for calcification roasting and smelting. The smelting temperature is 1100 ℃, roasting time 1h, to obtain ...

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Abstract

The invention discloses a method and system for treating vanadium slag and belongs to the field of extracting of valuable metal in the vanadium slag. The invention firstly discloses the method for treating the vanadium slag. The method includes the steps that the vanadium slag is subjected to oxidization magnetizing roasting firstly so that iron in the vanadium slag can be converted into magnetic ferroferric oxide to be subjected to magnetic separation recycling, vanadium can be enriched through the vanadium slag obtained after iron recycling, and non-magnetic vanadium-enriched slag is obtained; and calcium salt is mixed into the vanadium-enriched slag, then vanadium in the vanadium-enriched slag is recycled through an oxidization roasting-acid leaching vanadium extracting method, and therefore the iron and the vanadium in the vanadium slag can be extracted step by step. The invention further discloses the system for implementing the method for treating the vanadium slag. The system comprises an oxidization magnetizing roasting device, a magnetic separation device, an oxidization calcification roasting device, an acid leaching vanadium extracting device and a vanadium precipitation-roasting device. By means of the method and system for treating the vanadium slag, the recovery rate of the iron and the vanadium in the vanadium slag is high, the vanadium slag can be comprehensively utilized, and operation is simple.

Description

technical field [0001] The present invention relates to a method for treating vanadium slag, in particular to a method for extracting valuable elements iron and vanadium from vanadium slag, and also relates to a system for implementing the method, which belongs to the valuable metal Extract fields. Background technique [0002] Vanadium has good plasticity and can be rolled into sheets, foils and drawn wires at room temperature, and has elasticity and ductility at a certain temperature; a small amount of intergranular impurities, especially elements such as C, O, N and H, will make it Hardness and brittleness increase, but their ductility decreases. Vanadium has high impact value, good weldability and heat transfer, and has good corrosion resistance to seawater, alkaline solution, organic acid and inorganic acid. It can be used as structural material and chemical container of ship, seamless thin film Materials for wall pipes, etc. [0003] About 60% of the vanadium in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02C22B34/22
CPCC22B1/02C22B7/007C22B7/04C22B34/22Y02P10/20
Inventor 宋文臣王静静李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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