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Roasting technique for extracting vanadium from stone coal vanadium ore

A stone coal vanadium and roasting technology, which is applied in the field of roasting technology, can solve the problems of low leaching rate and achieve the effects of increasing leaching rate, obvious fixation, and convenient and energy-saving leaching process

Inactive Publication Date: 2010-06-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the leaching rate of salt-free roasting method is generally low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Stone-coal mixed ore samples (I) from three mines in a certain place in Hunan Province were analyzed for rock ore identification, and two light slices and two thin slices were ground for each sample. The results of rock and mineral identification analysis show that the properties of the three ore samples are similar. The main minerals of the ore are: clay minerals mainly kaolinite and illite, organic carbonaceous, quartz (clastic quartz, chemical sedimentary quartz, hydrothermal Quartz); secondary minerals include pyrite and barite; trace minerals include manganese ore, copper blue, blue chalcocite, chalcopyrite, sphalerite, detrital muscovite, sericite, chlorite, Anhydrite, rutile, white titanium stone, zircon, etc. No definite vanadium minerals were found.

[0030] Sampling 20kg, the theoretical content of vanadium pentoxide is 1.2%, all crushed to 2-3mm, mixed with calcium salt and then ball-milled to 100 mesh) = 80%. Part of the obtained mineral powder is made int...

Embodiment 2

[0033] Get the above-mentioned mixed ore sample (I), directly roast with powdery feed after primary crushing and calcium salt ball milling, the roasting system is the same as Example 1, the powdery calcined sand is directly leached with concentration of 4% dilute acid, The ratio of leaching liquid to solid is 2:1, stirring and leaching at room temperature for 3 hours, and after solid-liquid separation, the leaching rate of vanadium pentoxide in the leaching liquid is detected to be 82.77%.

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Abstract

A roasting process extracts vanadium from bone coal vanadium ore. The invention comprises primarily bruising bone coal raw materials, mixing ore material with calcium salt, balling after mixing calcium salt with 5-15% ore, disintegrating mixed ore powder to 100 meshes which are larger or equal to 80%, then making into pellets whose diameter is 10mm as roasting raw materials or directly using ore powder which is obtained through balling as roasting raw materials, conducting two stage roasting by adopting a digital control muffle furnace, wherein one stage roasting temperature is 700-800 DEG C,heat preservation time is 1-2h, and the oxygen is full in the furnace, the second stage roasting temperature is kept between 850 DEG C and 950 DEG C, heat preservation time is 2-5h, and the atmospherefurnace is lack of oxygen. The roasting is atmospherically leached under diluted acid, and the leaching rate of vanadic anhydride in the invention can reach over 82%.

Description

technical field [0001] The invention relates to a roasting process for extracting vanadium pentoxide from stone coal mines. Background technique [0002] Stone coal mines are widely distributed in southern my country, and stone coal reserves are 6181.8 billion tons, which is V in my country's vanadium-titanium magnetite 2 o 5 217 times the reserves. Therefore, extracting vanadium from stone coal has become an important development direction for my country to utilize vanadium resources. The discovery of stone coal mines has prompted the continuous improvement of the vanadium extraction process from stone coal. The traditional sodium salt roasting method has a high conversion rate, but the chlorine and hydrogen chloride produced seriously pollute the environment. Considering the additives, the current roasting process can be divided into: (1) calcium salt additives; (2) salt and calcium salt binary additives; (3) chlorine-free multi-component additives; (4) salt-free roasti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B7/00C01G31/02
CPCY02P10/20
Inventor 黄可龙刘素琴仲晓玲莫红兵李朝建王海华吴雪文
Owner CENT SOUTH UNIV