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Cleaning process for producing sodium vanadate and sodium chromate alkali solution by high chromium vanadium slag

A process method, the technology of alkaline solution, which can be applied to the improvement of process efficiency, chemical instruments and methods, chromate/dichromate, etc., can solve the problems of high energy consumption for evaporation, reduction of overall production capacity, and high reaction temperature, Achieve high resource utilization, shorten follow-up processes, and save energy

Active Publication Date: 2014-04-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

But this method also has the following disadvantages: (1) The reaction temperature is relatively high: when sodium hydroxide molten salt is used as the reaction medium, the reaction temperature is 500-600°C, and the reaction temperature can be reduced to 330-480°C after adding sodium nitrate
(2) The separation of vanadium and chromium is not complete, and there is a problem of mutual entrainment of vanadium and chromium products: due to the separation of sodium vanadate and sodium chromate by the fractional crystallization method, during the crystallization of sodium vanadate, although sodium chromate can be controlled not to precipitate , but the sodium chromate entrained in the sodium vanadate crystal is still relatively high. In order to reduce the entrained amount, washing with saturated sodium vanadate solution is bound to reduce the overall production capacity. At the same time, the sodium chromate in the saturated sodium vanadate solution after washing the crystal Difficult to remove; Similarly, when sodium chromate crystallizes, there are still problems similar to the above
(3) The energy consumption of the process is high: the mother liquor after crystallization needs to be completely dehydrated before it can be recycled, and the evaporation energy consumption of the process is high
Since the process route in the subsequent separation of vanadium and chromium and the preparation of sodium vanadate and sodium chromate has adopted the same method as CN102127656A, the method still has the defects of incomplete separation of vanadium and chromium and high process energy consumption

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  • Cleaning process for producing sodium vanadate and sodium chromate alkali solution by high chromium vanadium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Oxygen was introduced into the high-temperature high-chromium vanadium slag separated from molten iron, oxidized at 600° C. for 180 minutes, and then crushed, and the high-chromium vanadium slag particles were ground down to below 74 microns. The 10% sodium hydroxide solution is mixed with the ground high chromium vanadium slag and the theoretical amount of alumina to carry out the vanadium leaching reaction, wherein the volume mass ratio (L / kg) of the sodium hydroxide solution to the high chromium vanadium slag is: 10:1, the leaching temperature is 170°C, and the leaching time is 10h. After the leaching is completed, the slurry is filtered, and the slag is washed with two-stage countercurrent. The liquid-solid volume-to-mass ratio in the washing process is 8:1. The recovery rate is 98%, and the chromium is not leached. This process obtains vanadium extraction tailings and vanadium-containing alkaline solution respectively. The vanadium-containing alkaline solution is e...

Embodiment 2

[0059] Oxygen was introduced into the high-temperature high-chromium vanadium slag separated from molten iron, oxidized at 600° C. for 120 minutes, and then crushed, and the high-chromium vanadium slag particles were ground down to less than 74 microns. Mix 20% sodium hydroxide solution with ground high chromium vanadium slag and aluminum hydroxide with twice the theoretical amount to carry out vanadium leaching reaction, wherein the volume mass ratio of sodium hydroxide solution to high chromium vanadium slag (L / kg) was 8:1, the leaching temperature was 150 °C, and the leaching time was 8h. After the leaching was completed, the slurry was filtered, and the slag was washed with 3-stage countercurrent. The liquid-solid volume-to-mass ratio in the washing process was 6:1. The recovery rate of vanadium was calculated to be 98.5%, and the chromium was not leached. The vanadium extraction tailings and the vanadium-containing alkaline solution were obtained in this process. The van...

Embodiment 3

[0061] Air is introduced into the high-temperature high-chromium vanadium slag separated from the molten iron, oxidized at 890°C for 60 minutes, and then crushed, and the high-chromium vanadium slag particles are ground to below 74 microns. The leaching reaction of vanadium is carried out by mixing 40% sodium hydroxide solution with ground high chromium vanadium slag and 1.5 times the theoretical amount of sodium aluminate, wherein the volume mass ratio of sodium hydroxide solution to high chromium vanadium slag (L / kg) was 3:1, the leaching temperature was 100 °C, and the leaching time was 2h. After the leaching was completed, the slurry was filtered, and the filter cake was washed with 6-stage countercurrent. And the recovery rate of vanadium is calculated to be 98%, and the chromium is not leached. This process obtains vanadium extraction tailings and vanadium-containing alkaline solution respectively. The vanadium-containing alkaline solution is evaporated and concentrated...

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Abstract

The invention relates to a cleaning process for producing sodium vanadate and sodium chromate alkali solution by high chromium vanadium slag. The method provided by the invention comprises the main steps of: introducing oxidizing gas into the high-temperature high chromium vanadium slag separated from molten iron to oxidize vanadium into pentavalent vanadium; leaching vanadium out of the high chromium vanadium slag with an alkali solution, adding a silicon fixing agent for synchronized fixing of silicon, evaporating and concentrating the alkali leaching solution, cooling and crystallizing to prepare sodium vanadate, and reusing the cooling crystallization mother liquor; and conducting immersion cleaning and mixing on the vanadium-extracted tailings subjected to multistage countercurrent washing with alkali solution with a certain concentration, carrying out a roasting reaction in roasting equipment, and immersing reaction clinker with water and filtering to obtain an alkali solution of sodium chromate and the final slag. The method has the advantages of simple process, strong operability, recovery rate of vanadium greater than 98%, recovery rate of chromium more than 95% and separation rate of vanadium and chromium greater than 99%, thereby achieving efficient extraction and separation of vanadium and chromium.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a cleaning process for producing sodium vanadate and sodium chromate alkaline solution from high-chromium vanadium slag. Background technique [0002] High chromium vanadium slag is the vanadium and chromium-containing molten iron obtained after smelting high-chromium vanadium-titanium magnetite (such as the vanadium-titanium magnetite in the Hongge area of ​​Panzhihua) after blowing in the presence of oxidizing gas. Slag phase. The chromium content in the high-chromium vanadium slag is higher than that in the vanadium slag generally used in the vanadium metallurgy industry, and the chromium content in the slag is often greater than the vanadium content. At the same time, compared with ordinary vanadium slag, the separation of vanadium and chromium and the utilization of chromium must be considered in the process of extracting and utilizing vanadium from high-chromium ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22C22B34/32C01G37/14C01G31/00
CPCY02P10/20
Inventor 张洋徐红彬田颖张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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