Method for extracting vanadium and chromium from converter vanadium chromium slag

A vanadium-chromium slag and converter technology, which is applied in the field of extraction and recovery of vanadium and chromium resources, can solve the problems of molten salt recycling that needs further research and increased difficulty, and achieves low equipment requirements, convenient separation and extraction, The effect of high transfer rate

Active Publication Date: 2014-03-05
CHONGQING UNIV
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  • Summary
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Problems solved by technology

Although the Institute of Process Engineering of the Chinese Academy of Sciences proposed a method using NaOH-NaNO 3 Treating vanadium-chromium slag with molten salt can realize simultaneous transformation of vanadium and chromium, but this p...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this example, the vanadium-chromium slag obtained by smelting Hongge ore in an industrial experiment is treated by the step-by-step roasting-leaching method, and the content and effect of the present invention are further verified. Include the following process steps during implementation:

[0036] 1) Grind the vanadium-chromium slag with the composition shown in Table 1, take 50g of the under-sieve through a 200-mesh sieve and 10.16g of analytically pure Na 2 CO 3 Mix evenly, put it in a chemical porcelain evaporating dish, put it in a muffle furnace at 800°C, and bake at a constant temperature for 2 hours. During this period, keep the muffle furnace door not completely closed to ensure the oxidizing atmosphere in the furnace, and lightly stir the material every about 15 minutes to reduce agglomeration. After the roasting, take out the roasted clinker and cool it to room temperature in air, grind and sieve to ensure that more than 60% of the clinker has a particle...

Embodiment 2

[0050] In this embodiment, the method of simulation experiment is adopted to further verify the content and effect of the present invention. Include the following process steps during implementation:

[0051] 1) Prepare simulated vanadium-chromium slag. The analytically pure reagent FeC 2 o 4 2H 2 O (decomposition can generate FeO), V 2 o 3 、Cr 2 o 3 , CaO, SiO 2 、TiO 2 , MnCO 3 (Decomposition can generate MnO), MgO is weighed according to a certain proportion, put into a corundum crucible, put it into a 10kW resistance furnace, raise the temperature to 1500°C and keep it for half an hour, so that the slag is fully melted and uniform, and Ar gas is introduced during the heating and holding process to Anti-oxidation. Then cool down to 1200°C with the furnace at a cooling rate of 10~20°C / min, and take it out for air cooling. The condensed vanadium-chromium slag is crushed and ground to less than 200 meshes, and is ready for use. The chemical composition of the simul...

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PUM

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Abstract

The invention discloses a method for extracting vanadium and chromium from converter vanadium chromium slag. The method comprises the following steps: 1) adding Na2CO3 into the vanadium chromium slag, mixing uniformly and carrying out oxidizing roast on the mixture, wherein the addition of Na2CO3 is controlled according to a molar ratio of V2O3/Na2CO3 in the vanadium chromium slag being 0.1-0.4; grinding the roasted clinker, and leaching with water to obtain a primary roasted leaching solution and residue; 2) drying and grinding the residue to serve as a raw material from which vanadium and chromium can be extracted in the second step, adding Na2CO3 in the residue, mixing uniformly and carrying out oxidizing roast on the mixture, wherein the addition of Na2CO3 is controlled according to a molar ratio of (V2O3+Cr2O3)/Na2CO3 in the residue being 0.1-0.4; grinding the roasted clinker, and leaching with water to obtain a secondary roasted leaching solution; and 3) separately separating and extracting the vanadium and chromium from the primary roasted leaching solution and the secondary roasted leaching solution. The method disclosed by the invention is simple in process and high in vanadium and chromium immersion ratio and brings convenience for separating vanadium from chromium subsequently.

Description

technical field [0001] The invention relates to a method for resource utilization of metallurgical slag, in particular to a method for effectively extracting and separating vanadium and chromium from converter vanadium-chromium slag, and belongs to the field of extraction and recovery of vanadium and chromium resources. [0002] Background technique [0003] The Panxi region of China is rich in vanadium-titanium magnetite, which is an important resource of vanadium, titanium and iron. The typical smelting process of vanadium-titanium magnetite is to reduce it in blast furnace, smelting reduction furnace or rotary hearth furnace in advance to obtain vanadium-containing molten iron. Then pour it into a special vanadium extraction converter and blow in oxygen to make most of Si, Ti, Mn, most of V, Cr and part of C in vanadium-chromium iron water undergo oxidation reaction, and enter into the slag phase (oxidation of C The product enters the furnace gas), forming vanadium-cont...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 李鸿乂方海星张涛李翠王宁刁江谢兵
Owner CHONGQING UNIV
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