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Composite additive used for extracting vanadium from vanadium stone coal ore and using method thereof

A composite additive and coal mine technology, which is applied in the field of vanadium extraction from vanadium stone coal mines, can solve the problems of low vanadium recovery rate, achieve high product cost, improve conversion rate, and reduce environmental pollution

Active Publication Date: 2011-12-28
贵州义信矿业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The technical problem to be solved by the present invention is to solve the defects that the existing calcification and roasting vanadium extraction process has strict requirements on the raw materials of vanadium stone coal mines and the low recovery rate of vanadium, and provides a composite additive for extracting vanadium from vanadium stone coal mines and its use. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: the grade of vanadium stone coal mine is to contain V 2 o 5 0.62%, take 63kg of stone coal, decarburize at about 600°C, mix with 31.2kg of undecarbonized vanadium stone coal, add 5kg of lime and 0.8kg of fluorite, and grind it into -80 mesh 80%, 100 mesh 30% mineral powder, mixed evenly, shaped, oxidized and roasted at about 920°C for 5 hours, the content of free oxygen in the roasting flue gas is 5%, after cooling down, grind to 90% of -60 mesh, 35% of 80 mesh, and stir Use 1% sulfuric acid solution in the tank for leaching at room temperature for 25 minutes, the pH of the resulting leachate is 1.5, the L:S ratio of the leach slurry is 2.5:1, filter to obtain a vanadium-containing solution, send it to the ion exchange process, and wash the slag three times on the filter belt , the slag contains about 10% of the attached liquid, and the V in the attached liquid 2 o 5 The content is about 40mg / L, and the filtration performance of slag is good. The filt...

Embodiment 2

[0055] Embodiment 2: the grade of vanadium stone coal mine is to contain V 2 o 5 1%, take 55kg of stone coal, decarburize at about 550°C, mix with 28kg of non-decarbonized vanadium stone coal, add 12kg of limestone and 5kg of fluorite, and grind it into -80 mesh 60%, 100 mesh 40% The ore powder is mixed evenly, shaped, and oxidized and roasted at 870°C to 890°C for 7 hours. The free oxygen content in the roasting flue gas is 6%. After cooling down, it is ground to 90% of -60 mesh and 35% of 80 mesh. Use 1% sulfuric acid solution in the stirring tank for leaching at room temperature for 25 minutes, the pH of the obtained leachate is controlled at 1.5, the L:S ratio of the leach slurry is 2.4:1, filter to obtain a solution containing vanadium, and send it to the ion exchange process. The slag is washed three times, and the slag Containing about 10% of the attached liquid, V in the attached liquid 2 o 5 The content is about 40mg / L, and the filtration performance of slag is go...

Embodiment 3

[0056] Example 3: Take 60.2kg of stone coal ore, decarburize at about 650°C, and mix with 31.3kg of vanadium stone coal ore without decarburization to ensure that the calorific value of vanadium stone coal ore is not greater than 1260kJ / kg. Add 4kg of lime, 4kg of limestone and 0.5kg of fluorite, grind it into -80 mesh 70%, 100 mesh 30% ore powder, mix evenly, shape, oxidize and roast at about 900°C for 6 hours, the free oxygen in the roasting flue gas The content is 4%, and after cooling down, it is ground to 90% of -60 mesh and 35% of 80 mesh, and is leached with 1% sulfuric acid solution at room temperature for 25 minutes in a stirring tank. The pH of the obtained leachate is controlled at 2.9, and the L:S ratio of the leach slurry 2.1:1, filter to obtain vanadium-containing solution, send it to the ion exchange process, the slag is washed three times, and the filtered and washed slag is sent to the slag dump, the filtrate is ion exchanged and desorbed, and the desorbed solu...

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Abstract

The invention provides a compound addition agent using for extracting vanadium from vanadium ore and the usage method. The compound addition agent is prepared by mixing 1-8 parts of lime and 0.1-6 parts of fluorite, wherein calcium oxide equivalent limestone or the mixture of lime and limestone can be used as lime, compound addition agent is taken according to proportion when dispensed, vanadium ore is added to 100 parts and is conducted oxidizing roasting for 1.5-7 hours with 870 DEG C to 980 DEG C, and the content of free oxygen in roasting smoke is 2-8%. Compared with the prior art, the compound addition agent of the invention increases conversion rate of ore over 20%, enlarges the application range of low grade vanadium ore, reduces the grade of vanadium to 0.5% from 0.7%, which also is suitable to the roasting vanadium extraction of all vanadium coal ore. And the fluorite and lime are easy to be obtained and are cheap, which largely reduces production cost, and the technology of the invention has small pollution to environment.

Description

technical field [0001] The invention relates to the field of vanadium extraction from vanadium stone coal mines, in particular to a composite additive for extracting vanadium from vanadium stone coal mines and a use method thereof. Background technique [0002] Most of the vanadium in the vanadium stone coal mine exists in a trivalent state that cannot be dissolved in a stable acid-base solution, so it is difficult to extract vanadium from the vanadium stone coal mine. Currently, there are three commonly used techniques for extracting vanadium, each with its own advantages. Advantages and disadvantages: [0003] 1. Additive-free vanadium extraction process: [0004] The biggest advantage of this process is additive-free oxidative roasting, simple process and little environmental pollution, but it has a fatal disadvantage, that is, the recovery rate of vanadium is low, the best is only about 40%, which is a serious waste of resources, and it is only suitable for Very few va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B9/10
Inventor 程立吴涛
Owner 贵州义信矿业有限公司
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