Method for controlling leaching of silicon impurity during vanadium extraction smelting of vanadium ore

A vanadium ore and leaching technology, applied in the field of metallurgy, can solve the problems of increasing the extraction process links, chemical raw materials and operating costs, etc., and achieve the effects of reducing the leaching amount, smooth and reliable process flow, and simplifying the purification process.

Active Publication Date: 2008-04-09
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above examples of vanadium smelting background technologies all adopt purification processes, such as ion exchange, solvent extraction, chemical precipitation and other process treatment methods to purify impurities such as silicon, which increases the extraction process links and chemical raw materials and operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A siliceous vanadium ore (stone coal mine, crushed to -80 mesh, containing 17.0% C, containing SiO 2 60.0%, including V 2 o 5 0.8%), add 14% of the weight of vanadium ore lime (CaO content 70.0%) and mix evenly, after roasting at 1000°C for 2 hours, add 15.0% of the weight of the roasted ore to wet the ore, and then add 24.0% of the weight of the roasted ore. (H 2 SO 4 Content 98%, 18mol / L), mixed evenly with roasted ore at room temperature (25°C), placed at room temperature (25°C) for 55 minutes to mature, then added acid water with a pH of 2.0, stirred and leached for 2 hours, filtered to obtain SiO 2 , V 2 o 5 See Table 1 for the content.

[0026] From the results of the examples in Table 1 and the results of the acid leaching process without aging under the same conditions and adding the same amount of acid, it can be seen that: under the same amount of acid, the stone coal mine is matured with concentrated acid before leaching Compared with non-slaking, th...

Embodiment 2

[0031] Crushing a coal gangue vanadium ore to -60 mesh (containing C13.0%, containing SiO 2 70.0%, including V 2 o 5 0.9%), add 18.0% lime (containing calcium oxide 70.0%), and mix with 5.0% water evenly, after roasting at 950°C for 2 hours, add 10.0% water and mix evenly, then add % concentrated sulfuric acid (H 2 SO 4 Content 98% (W), 18mol / L) mixed with roasted ore at room temperature (30°C), after standing at room temperature (30°C) for 50 minutes, stirring and leaching at room temperature for 2 hours with pH 2.0 acid water, filtered to obtain See Table 2 for the leaching solution, and compare it with the direct pickling solution with the same amount of acid without aging under the same conditions.

[0032] Table 2 Example 2 mature leachate and non-ripened acid leach result comparison table

[0033] SiO 2 content

[0034] It can be seen from Table 2 that in this example, under other identical conditions, there is no significant difference in the leachi...

Embodiment 3

[0036] A vanadium ore (containing vanadium clay ore) (containing 0.34% of C, containing SiO 2 86.0%, including V 2 o 5 0.8%, containing Al 2 o 3 2.8%) after crushing to -60 mesh. Add lime (containing 70.0% calcium oxide) and mix well, roast at 800°C for 12 hours, then add water accounting for 20.0% of the weight of the burnt ore and mix evenly, add concentrated sulfuric acid (H 2 SO 4 Content 95.0% (W), 17mol / L) after mixing and aging (placed at room temperature at 20°C) for 40 minutes, stirring and leaching with water, liquid-solid ratio 2:1, leaching time 1h, leaching temperature at room temperature (20°C), filtered The leachate obtained is shown in Table 3. And compared with the pickling solution of non-ripening direct pickling under the same conditions.

[0037] It can be seen from Table 3 that in Example 3, under other identical process conditions, the leaching rate of vanadium in mature leaching is not lower than that in non-aging leaching, and the content of s...

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PUM

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Abstract

The invention of controlling a lixiviation of silicon impurity during the process of extracting vanadium from navajoite belonging to the technical field of metallurgy, relates to an extraction method of vanadium from navajoite. The method is to add concentrated acid (vitriol, etc.), concentration of which is greater than 5 mol / L, before the lixiviation of siliceous vanadium; then lixiviates are carried out after an aging in normal temperature. When in the process of the lixiviation of the concentrated acid after the aging, the silicon contained the vanadium forms a solid of undissolving SiO2, which retains within the slag instead of dissolved in the lixiviation solution lixiviating with vanadium. The invention is characterized in that the invention effectively controls the lixiviation of the silicon impurity without affecting the lixiviation rate of vanadium or increasing the consumption of chemical raw material, simplifies the subsequent purification process of the silicon during the extraction and smelting of navajoite, lowers production cost, leads the process of extraction and smelting process to be fluent and reliable. The invention reduces the lixiviation of silicon by no less than 95%, which is suitable for the vanadium extraction and a smelting process for the siliceous navajoite such as a stone coal mine, a coal gangue, the navajoite (including vanadium clay mine), a vanadium titanium magnetite, the SiO2 content of which is greater than 2%, or the baked ore and suitable for the extraction and smelting process for the siliceous navajoite the SiO2 content of which is greater than or equal to 2% during the smelting process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a smelting method for extracting vanadium from vanadium ore, in particular to a method for controlling the leaching of silicon during the smelting process of vanadium ore extracting vanadium. Background technique [0002] In the vanadium extraction and smelting of vanadium ore, it is necessary to use leaching method to extract vanadium from vanadium ore (stone coal mine, vanadium slag, etc.), and then remove impurities, purify and concentrate the leaching solution, and finally precipitate and calcinate it. into industrial vanadium products. During the leaching process of siliceous vanadium ore, part of silicon will be leached together with vanadium. Especially in acid leaching solution and alkali leaching solution, silicon is the main impurity, and the amount of leaching is very large, which seriously affects the subsequent process operation and product quality. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B34/22
CPCY02P10/20
Inventor 刑学永李斯加宁顺明刘建中黄臻高佘宗华蒙在吉李肇佳
Owner CHANGSHA RES INST OF MINING & METALLURGY
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