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Stone coal vanadium ore cascade oxidizing roasting vanadium extraction system and oxidizing roasting method

A technology of oxidative roasting and stone coal vanadium, which is applied in the field of vanadium extraction from stone coal vanadium ore, can solve problems such as ore discharge, high exhaust temperature, waste heat not being effectively recovered, and heat utilization rate to be improved, so as to prevent sintering and improve Energy utilization rate, effect of reducing natural gas and electric energy consumption

Pending Publication Date: 2022-03-01
上海逢石科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The ore discharge and exhaust temperature of the current suspension roasting equipment is relatively high, the waste heat has not been effectively recovered, and the heat utilization rate needs to be improved

Method used

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  • Stone coal vanadium ore cascade oxidizing roasting vanadium extraction system and oxidizing roasting method
  • Stone coal vanadium ore cascade oxidizing roasting vanadium extraction system and oxidizing roasting method
  • Stone coal vanadium ore cascade oxidizing roasting vanadium extraction system and oxidizing roasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Suspension roasting of a stone coal vanadium ore, where V 2 o 5 The content is 1.30%, the carbon content is 4.8%, and the -0.1mm content is 90%.

[0061] (1), start the Roots blower 16, control the negative pressure of the blower to be -2.0kpa, provide negative pressure for the inside of the system and start the burner 11 to ignite the natural gas, so that the high-temperature flue gas enters the main furnace 6. Keep the temperature at the top of the main furnace at about 710°C.

[0062] (2), pass into 3m to flow sealing valve 5 3 / h loose wind (air), 10m 3 / h fluidization wind (air); feed 6m to the decarburization roasting reactor 8 3 / h loose wind (air), 19m 3 / h fluidization wind (16m 3 / h air, 3m 3 / h oxygen); Pass into 8m to breaking crystal roasting reactor 9 3 / h loose wind (air), 20m 3 / h Fluidizing wind (air).

[0063] (3) Set the feeding of the weight loss scale 2 to 100kg / h, and carry out the sealing operation. When the output is stable at 100kg / h,...

Embodiment 2

[0070] Embodiment 2 method is the same as embodiment 1, and difference is:

[0071] (1), for a certain V 2 o 5 The high-carbon stone coal vanadium ore with a content of 0.95% and a carbon content of 12.6% is subjected to suspension roasting. Raw ore -0.045mm content accounts for 85%.

[0072] (2), the feed rate of weight loss scale 2 is 20kg / h, the temperature of the first-stage decarburization roasting reactor 8 is 630°C, and the time is 1.5h, and the temperature of the second-stage crystal-breaking roasting reactor 9 is 940°C, and the time is 12h .

[0073] (3) The amount of concentrated sulfuric acid used in roasting samples is 15wt%, the liquid-solid ratio is 1:1, the amount of leaching aid (calcium fluoride) is 2.5%, the leaching temperature is 75°C, the leaching time is 8h, and the stirring speed is 600r / min, the leaching rate of vanadium reaches 82.32%, which is 30.55 percentage points higher than that of the original ore, and 14.25 percentage points higher than th...

Embodiment 3

[0075] Embodiment 3 method is the same as embodiment 1, and difference is:

[0076] (1), for a certain V 2 o 5 The stone coal vanadium ore with a carbon content of 1.50% and a carbon content of 8.5% is subjected to suspension roasting. Raw ore -0.045mm content accounts for 90%.

[0077] (2), the feed rate of weight loss scale 2 is 35kg / h, the temperature of the first-stage decarburization roasting reactor 8 is 600°C, and the time is 1.2h, and the temperature of the second-stage crystal-breaking roasting reactor 9 is 950°C, and the time is 10h .

[0078] (3) The amount of concentrated sulfuric acid used in the roasted sample is 10wt%, the liquid-solid ratio is 1.25:1, the amount of leaching aid (calcium fluoride) is 0.5%, the leaching temperature is 85°C, the leaching time is 6h, and the stirring speed is 1000r / min, the leaching rate of vanadium reaches 89.62%, which is 28.54 percentage points higher than that of the original ore, and 18.15 percentage points higher than th...

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Abstract

The invention provides a stone coal vanadium ore cascade oxidizing roasting vanadium extraction system and an oxidizing roasting method. The system comprises a feeding system, a discharging system and a vanadium extraction system, wherein the feeding system is composed of a stock bin, a weightlessness scale and a spiral feeding pipe; the material circulating heat storage system consists of a primary cyclone separator, a flow sealing valve, a main furnace and a secondary cyclone separator; the stepped oxidizing roasting system consists of a decarburization roasting reactor, a crystal breaking roasting reactor and an ore discharge heat exchange pipe; the negative pressure dust removal system consists of a three-stage cyclone separator, a dust hopper, a bag-type dust remover, a Roots blower and a chimney; the decarburization roasting reactor and the crystal breaking roasting reactor are connected in series, so that the purpose of segmented suspension roasting of materials can be achieved; in addition, the system comprises a four-stage heat exchange process and a first-stage self-heating utilization process, and the overall energy utilization rate is extremely high, so that the stepped oxidation roasting system has the advantages of independent and controllable two-stage roasting, full gas-solid contact, high energy utilization rate, high mass and heat transfer efficiency, low operation cost, high efficiency, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal vanadium ore, and in particular relates to a vanadium extraction system and an oxidation roasting method for stone coal vanadium ore by cascade oxidation roasting. Background technique [0002] At present, there are many kinds of vanadium extraction processes from stone coal, mainly including sodium roasting-water leaching, calcification roasting-acid (alkali) leaching, compound additive roasting-leaching, additive-free oxidative roasting-acid (alkali) leaching and direct leaching. For carbon-bearing stone coal vanadium ore, the roasting process is a crucial part to improve the leaching rate. The current roasting equipment is mainly flat kiln and vertical kiln. [0003] As a fluidized roasting technology, suspension roasting has the advantages of sufficient gas-solid contact, high mass and heat transfer efficiency, low operating cost and environmental protection. In pa...

Claims

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Application Information

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IPC IPC(8): F27D17/00F27D19/00C22B1/10C22B34/22
CPCF27D17/004F27D17/008F27D19/00C22B1/10C22B34/22
Inventor 高占奎韩跃新李艳军
Owner 上海逢石科技有限公司
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