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Technique for reclaiming vanadium and iron from high-vanadium high-iron steel slag

A new technology, steel slag technology, applied in the metallurgical field of vanadium extraction, can solve the problems of not being able to process in large quantities, limited thinking, difficult to control the production process, etc., to achieve comprehensive recycling and utilization is of great significance, realize comprehensive utilization, and reduce difficulty Effect

Inactive Publication Date: 2008-02-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most notable feature of trivalent Fe in aqueous solution is its strong hydrolysis tendency and the ability to form complexes. Therefore, the loss of vanadium is relatively large when the iron is hydrolyzed.
It can be seen that the conventional method uses sodium carbonate or sodium hydroxide to adjust the pH value of the solution to make Fe 2+ , Fe 3+ The idea of ​​impurity removal and purification by waiting for cations to generate hydroxide precipitation is too limited, and when the solution is adjusted to neutral or alkaline, a large amount of alkaline substances need to be consumed, and the solution must be concentrated after impurity removal, so its production cost is high. The production process is difficult to control
[0007] Although there are many existing techniques for extracting vanadium from solid waste, they generally have the disadvantages of high cost, heavy pollution, low recovery rate and incapable of large-scale treatment. The popularization and application are limited, and the applicability to high-calcium and high-iron steel slag is relatively small.

Method used

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  • Technique for reclaiming vanadium and iron from high-vanadium high-iron steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The object is massive steel slag from Sichuan Chuanwei Group. The steel slag is produced within a relatively short converter steelmaking time range. It is characterized by insufficient oxidation and relatively high vanadium content, which is obviously conducive to improving the economic benefits of vanadium extraction. Firstly, the steel slag raw material is crushed, and the dry ball mill equipment is used for grinding, and the fineness of the crushed product is 65% to -200 mesh;

[0026] Grinding products are subjected to dry weak magnetic separation, the magnetic field strength is 1800Oe, most of the vanadium enters the weak magnetic separation tailings, and the recovery rate reaches over 95%. At the same time, iron is enriched in the weak magnetic separation concentrate, and its yield is About 9%, the concentrate iron grade reaches 95%, which not only realizes the comprehensive recovery of iron, but also reduces the amount and concentration of iron in the acid leachin...

Embodiment 2

[0034] The target steel slag is produced within a relatively short converter steelmaking time range, and is characterized by insufficient oxidation and relatively high vanadium content. First, the steel slag raw material is crushed, and the dry ball mill equipment is used for grinding, and the fineness of the crushed product is 75% to -140 mesh.

[0035] Grinding products are subjected to low-temperature blank roasting, the roasting time is about 1.5h, and the temperature is 900°C.

[0036] The roasted clinker is subjected to dry weak magnetic separation, the magnetic field strength is 3900Oe, most of the vanadium enters the tailings of weak magnetic separation, and its recovery rate reaches 95%. At the same time, iron is enriched in the weak magnetic separation concentrate, and its yield is 8.6 %, the concentrate iron grade is about 94.3%, which not only realizes the comprehensive recovery of iron, but also reduces the amount and concentration of iron in the acid leaching sol...

Embodiment 3

[0043] First of all, crush a block of steel slag raw material in Sichuan, and use dry ball mill equipment for grinding, and the fineness of the crushed product is 80% to -140 mesh;

[0044] After grinding, the product is subjected to dry weak magnetic separation, the magnetic field strength is 2000Oe, most of the vanadium enters the tailings of weak magnetic separation, and the recovery rate reaches more than 95%. At the same time, iron is enriched in the weak magnetic separation concentrate, and its yield It is about 9%, and the iron grade of the concentrate reaches 95%, which not only realizes the comprehensive recovery of iron, but also reduces the amount and concentration of iron in the acid leaching solution.

[0045] Weak magnetic separation tailings are subjected to low-temperature blank roasting, the roasting time is about 2 hours, and the temperature is 800°C.

[0046] The clinker was roasted and then subjected to dry weak magnetic separation. It was found that the yi...

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Abstract

A novel technology is used for recycling iron and vanadium from calcium-rich or iron-rich steel slag. The invention relates to a metallurgical method of extracting vanadium, in particular to a method that extracts vanadium or iron from abandoned steel slag with multidisciplinary technologies. The technology has the following procedures: (1) The calcium-rich or iron-rich steel slag is crushed, the iron contained in the steel slag is recycled by magnetic separation, and the material that will correspondingly change low-valent vanadium is roasted into high-valent vanadium contained in the material, or the material is first roasted and then magnetic separated; (2) the material is soaked with 95-98 percentage concentrated sulfuric acid, and then solid-liquid separation is conducted; (3) the acidity of lixivium is adjusted, to make sure the pH of the lixivium is in 1.0 to 2.3, and the oxidation-reduction potential is -1000 to 200mv; (4) Extraction above grade two is adopted, the extraction phase ratio O / A is 1 / 6 to 1 / 1, and then the aqueous phase unloaded; (5) the organic washing is applied in the load to remove iron, and the washing agent used is sulphate; (6) 0.25M to 1.5M alkaline solution is adopted as a stripping agent for back-extraction, with a phase ratio of O / A 1 / 1 to 6 / 1, so as to deposit vanadium contained in solution. The invention is characterized by simple technology, low cost, small environmental pollution and high recovery ratio in the process of extracting vanadium and iron from calcium-rich or iron-rich steel slag.

Description

technical field [0001] The invention relates to a metallurgical method for extracting vanadium, in particular to a method for extracting vanadium from waste steel slag by a combination process of separation and metallurgy. Background technique [0002] Vanadium-containing steel slag is produced in the steelmaking process of vanadium-containing molten iron, which is characterized by high calcium oxide and iron content and low vanadium content. In addition, vanadium-containing steel slag has a complex form of vanadium, and all vanadium is dispersed in a variety of mineral phases, making it difficult to directly select, smelt and separate, so it is extremely difficult to extract vanadium from high-calcium and high-iron vanadium-containing steel slag. [0003] The total annual discharge of steel slag in my country reaches several million tons. Due to the wide source and large amount of vanadium-containing steel slag, if the vanadium-containing steel slag is economically and rati...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/14C22B1/02B03B1/02C22B3/08C22B3/26
CPCY02P10/20
Inventor 童雄叶国华
Owner KUNMING UNIV OF SCI & TECH
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