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Method for reclaiming valuable element through gradient chlorination of vanadium slag

A technology of valuable elements and vanadium slag, which is applied in the chemical industry, can solve the problems of waste of resources, unused extraction of vanadium slag, complex purification process, etc., and achieve the effects of saving production costs, non-polluting benefits, and saving water resources

Active Publication Date: 2010-09-29
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can effectively extract the titanium element in the slag, and some other valuable elements in the slag are also chlorinated and removed in the form of impurities, which not only complicates the subsequent purification process but also causes a waste of resources
At present, there is no method for comprehensively extracting valuable elements in vanadium slag by chlorination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] will contain V 2 o 5 10% vanadium slag powder, graphite powder, and potassium chloride are mixed evenly in a mass ratio of 1:0.125:0.02 and then added to the carbonaceous rotary kiln. 3 The amount of / t vanadium slag is fed with nitrogen, and the temperature of the high-temperature section in the furnace reaches 400°C by means of external heating, and then the temperature is kept at 1500m 3 The amount of / t of vanadium slag is to pass chlorine gas into the kiln, and the charge stays at 400°C for 60 minutes. During this process, the vanadium in the vanadium slag is generated in the form of chloride, vaporized and separated from the original slag. The main fraction is vanadium tetrachloride and vanadium oxytrichloride. Stop feeding chlorine gas, continue to raise the temperature inside the kiln to 750°C by means of external heating, and keep it warm, according to 1500m 3 The amount of / t of vanadium slag is to pass chlorine gas into the kiln, and the charge stays at 75...

Embodiment 2

[0036] will contain V 2 o 5 12.85% vanadium slag powder, charcoal powder, and sodium chloride are mixed evenly in a mass ratio of 1:0.15:0.025 and then added to the shaft furnace. 3The amount of / t vanadium slag is fed into argon, and the temperature of the high temperature section in the furnace reaches 350°C by means of external heating, and then it is kept warm, according to 2000m 3 The amount of / t vanadium slag puts chlorine gas into the furnace, and the charge stays at 350°C for 70 minutes. During this process, the vanadium in the vanadium slag is generated in the form of chloride, vaporized and separated from the original slag. The main fraction is vanadium tetrachloride and vanadium oxytrichloride. Stop feeding chlorine gas, continue to heat the furnace to 700°C by means of external heating, and then keep it warm, according to 2000m 3 The amount of / t vanadium slag is passed into the furnace with chlorine gas, and the charge is kept at 700°C for 70 minutes. The iron...

Embodiment 3

[0038] will contain V 2 o 5 15.38% vanadium slag powder, coke powder, sodium chloride and potassium chloride are mixed evenly in a mass ratio of 1: 0.175: 0.03: 0.03 and then continuously added to the fluidized furnace from the upper part of the fluidized furnace tube to 1000m 3 The amount of / t vanadium slag is passed into the furnace with nitrogen gas, and the temperature of the high temperature section in the furnace reaches 300°C by means of external heating, and then the temperature is kept at 1800m 3 The amount of / t vanadium slag is passed into the furnace with chlorine gas, and the charge is kept at 300°C for 80 minutes. During this process, the vanadium in the vanadium slag is generated in the form of chloride, vaporized and separated from the original slag. The main fraction of chlorination in this section is vanadium tetrachloride and vanadium oxytrichloride. Stop feeding chlorine gas, continue to heat the furnace to 450°C and then keep it warm, according to 1800...

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Abstract

The invention relates to a method for reclaiming valuable elements through gradient chlorination of vanadium slag, which belongs to the technical field of chemical industry and is used for solving the problem of efficiently reclaiming multiple metal elements in the vanadium slag. The method is characterized by comprising the steps of proportioning raw materials, fractionating vanadium tetrachloride and vanadium oxytrichloride, fractionating ferric trichloride, fractionating titanium tetrachloride, chromium trichloride and silicon tetrachloride, collecting fractionation products, processing chlorination tailings and the like. By directly adopting the vanadium slag as the raw material in the method of the invention, the highly efficient and comprehensive utilization of vanadium-titanium magnetite resources is realized in one process; the valuable elements such as iron, vanadium, chromium, silicon, titanium and the like are enriched through gradient chlorination and selective separation, and the purifying process is relatively simple; closed circulation can be realized by using chlorine in the process and has no environmental pollution; and the whole flow is disengaged from an aqueous system, thereby water resources are saved, and meanwhile, the pollution of the traditional flow to the environment is avoided. The method of the invention has the advantages of short flow, high element yield, no pollution, high benefit and the like.

Description

technical field [0001] The invention relates to a method for recovering vanadium slag, in particular to a method for recovering valuable elements in metallurgical vanadium slag by gradient chlorination, and belongs to the technical field of chemical industry. Background technique [0002] Vanadium-titanium magnetite is a compound paragenetic ore, and its mineral composition is much more complex than that of ordinary iron ore. In addition to iron, the ore also contains a large amount of valuable elements such as vanadium, titanium, and chromium. These elements are enriched into the slag along with the smelting of vanadium-titanium magnetite. The smelting process of vanadium-titanium magnetite includes blast furnace ironmaking, converter vanadium extraction steelmaking, converter steelmaking, refining and other steps. The vanadium slag produced in the smelting process is a multi-element enriched material rich in iron, vanadium, titanium, chromium and silicon, which is blown ...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 刘晓华陈东辉
Owner HEBEI IRON AND STEEL
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