Stone coal vanadium ore oxidation grain breaking roasting comprehensive utilization method

A technology of stone coal vanadium and crystal breaking, applied in the direction of silicon oxide, silicon dioxide, process efficiency improvement, etc., can solve the problems of low heat utilization rate, low processing capacity, high cost, etc., and achieve low operating cost and large processing capacity , energy consumption and low cost effect

Active Publication Date: 2020-09-29
NORTHEASTERN UNIV
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AI Technical Summary

Problems solved by technology

It is proposed to firstly mix and grind vanadium-containing stone coal raw ore with roasting additives, then heat it at 700-900°C for 1-1.5 hours to obtain calcined sand, and finally extract vanadium by leaching with dilute sulfuric acid, and use the leached slag as cement admixture. The method realizes the comprehensive utilization of stone coal vanadium, but its roasting preparation needs to add roasting additives, the cost is high, the pollution is large, and the traditional roasting process has problems such as low processing capacity and low heat utilization rate; in addition, decarburization and vanadium oxidation are carried out simultaneously. carry out, leading to the interaction of decarburization reaction and oxidation reaction

Method used

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  • Stone coal vanadium ore oxidation grain breaking roasting comprehensive utilization method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The process is like figure 1 Shown

[0052] Crush the stone coal vanadium ore to a particle size of ≤15mm, and then grind the ore to a particle size of ≤1mm, and the part with a particle size of 0.074mm accounts for 62% of the total mass to obtain fine ore; the stone coal vanadium ore contains SiO by mass percentage 2 58.77%, Al 2 O 3 7.2%, V 2 O 5 1.05%, TFe 2~3%, CaO 3.22%, MgO 1.22%, Na 2 O 1.11%, C 12.5%;

[0053] The powder ore is continuously conveyed to the suspension decarburization roaster through the screw feeder; the bottom of the suspension decarburization furnace is equipped with a first burner and a gas inlet, the top is equipped with a feed inlet, and the upper part is equipped with a discharge outlet and the first cyclone The separator is connected; the gas is fed into the first burner, and oxygen and air are fed into the gas inlet of the suspension decarburization furnace, and the flue gas generated by the combustion of the first burner enters the suspensi...

Embodiment 2

[0062] The method is the same as in Example 1, the difference is:

[0063] (1) The part with a diameter of 0.074mm in the fine ore accounts for 65% of the total mass; the stone coal vanadium ore contains SiO according to the mass percentage 2 60.2%, Al 2 O 3 7.4%, V 2 O 5 1.1%, TFe 2.55%, CaO 2.78%, MgO 1.43%, Na 2 O 1.25%, C11.56%;

[0064] (2) The decarburization reaction temperature is 800℃; the residence time of the fine ore in the suspension decarburization roaster is 40min; the volume flow ratio of oxygen and air is 1:2;

[0065] (3) Crystal breaking oxidation reaction temperature is 850℃; the residence time of the decarburized material in the suspension crystal breaking roaster is 90 minutes; the volume flow ratio of oxygen and air is 1:5;

[0066] (4) The oxide material is discharged when the temperature is reduced to 180℃, and the air temperature after heat exchange is 650℃;

[0067] (5) Mix the cooled oxide material with a sulfuric acid solution with a mass concentration of ...

Embodiment 3

[0072] The method is the same as in Example 1, the difference is:

[0073] (1) The part with a particle size of 0.074mm in the fine ore accounts for 68% of the total mass; the stone coal vanadium ore contains SiO by mass percentage 2 61.43%, Al 2 O 3 7.96%, V 2 O 5 0.74%, TFe 2.97%, CaO 3.38%, MgO 1.28%, Na 2 O0.95%, C10.36%;

[0074] (2) The decarburization reaction temperature is 850℃; the residence time of the fine ore in the suspension decarburization roaster is 30min; the volumetric flow ratio of oxygen and air is 1:3;

[0075] (3) Crystal breaking oxidation reaction temperature is 900℃; the residence time of the decarburized material in the suspension crystal breaking roaster is 60min; the volume flow ratio of oxygen and air is 1:8;

[0076] (4) The oxide material is discharged when the temperature is lowered to 200℃, and the air temperature after heat exchange is 700℃;

[0077] (5) The mass concentration of the sulfuric acid solution is 85%; the mass of the sulfuric acid soluti...

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Abstract

The invention discloses a stone coal vanadium ore oxidation grain breaking roasting comprehensive utilization method. The method is carried out according to the following steps (1) a stone coal vanadium ore is crushed and ground to obtain powder ore; (2) the power is delivered to a suspended decarburization roasting furnace for decarburization reaction; (3) a decarburized material is subjected tocyclone separation and then enters a suspended grain breaking roasting furnace to be subjected to a grain breaking oxidation reaction; (4) an oxidized material is discharged after cyclone separation;(5) cooling is conducted to 150-200 DEG C is conducted, acid mixing curing leaching, or directly leaching is conducted; (6) a leached material is filtered to obtain a V2O5 leaching solution; (7) filter residue is mixed with a sodium hydroxide solution for secondary leaching, and filtering is conducted to obtain a secondary filtrate; (8) hydrochloric acid is added into the secondary filtrate to generate white precipitate, and filtering is conducted to obtain third filter residue, and drying is conducted to obtain white carbon black. According to the method, sodium salt adding is not required byroasting, the problems of incomplete vanadium oxidation, low equipment processing amount, high operation cost and the like in a traditional process are solved, the process flow is simple, equipment and system operation are stable, and energy consumption and cost for unit processing amount are low.

Description

Technical field [0001] The invention belongs to the technical field of mineral processing, and particularly relates to a method for comprehensive utilization of stone coal vanadium ore by oxidation, crystal breaking and roasting. Background technique [0002] Vanadium is a rare non-ferrous metal with a high melting point. As an alloy additive, it can effectively improve the strength and toughness of the alloy. It is widely used in steel production, aerospace, medical and health, electronics, military and other fields; 35% of vanadium consumption and national defense The military industry is closely related and its strategic position is irreplaceable. The mineral resources for extracting vanadium mainly include vanadium-titanium magnetite and stone coal. The existing technology of extracting vanadium from stone coal has complicated process flow, serious environmental pollution and high operating cost. The large amount of waste residue after vanadium extraction is mostly used to bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B1/10C22B3/08C01B33/12
CPCC01B33/12C01P2006/80C22B1/10C22B3/08C22B34/22Y02P10/20
Inventor 李艳军韩跃新谢瑞琦高鹏袁帅孙永升
Owner NORTHEASTERN UNIV
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