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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  • 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

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

Example Embodiment

[0059] Example 1:

[0060] Suspend the vanadium mine of a stone coal, where V 2 O 5 The content was 1.30%, containing 4.8% carbon content, - 0.1 mm content of 90%.

[0061] (1), start the Roots fan 16, the control fan negative pressure is -2.0kPa, providing a negative pressure starting burner 11 to ignit the natural gas to the main furnace 6 for the system. Keep the top temperature of the main stove is about 710 ° C.

[0062] (2) 3M to the flow sealing valve 5 3 / H loose wind (air), 10m 3 / h fluidized wind (air); 6M to the decarburized roasting reactor 8 3 / H loose wind (air), 19M 3 / h fluidized wind (16M 3 / H air, 3M 3 / H oxygen; access 8M to the broken calcination reactor 9 3 / h loose wind (air), 20m 3 / H fluid (air).

[0063] (3), set the weight loss called 2 feedstock is 100kg / h, and the sealing operation is carried out. When the amount is stable in 100 kg / h, the seal is completed, reduced to the mine to 40 kg / h, and officially started the roast operation.

[0064]...

Example Embodiment

[0069] Example 2:

[0070] Example 2 The method is in Example 1, and the difference is:

[0071] (1), for a V 2 O 5 The content of 0.95% is 0.95%, and the amount of high carbon yan coal vanadium containing 12.6% is carried out. The original ore -0.045 mm content accounts for 85%.

[0072] (2), the weight is called 2 feed content of 20 kg / h, and the temperature of a decarburized roasting reactor 8 is 630 ° C, the time is 1.5 h, and the temperature of the two-stage broken calcination reactor 9 is 940 ° C, and the time is 12 h. .

[0073] (3), the calcination sample is 15% by weight of concentrated sulfuric acid, the liquid solid ratio is 1: 1, the cumper (calcium fluoride) is 2.5%, the leaching temperature is 75 ° C, the leaching time is 8 h, the stirring rotation speed is 600R Under the conditions of / min, the vanadium leaching rate of 82.32%, which increased by 30.55 percentage points compared to the original mine, which increased by 14.25 percentage points compared to the orig...

Example Embodiment

[0074] Example 3:

[0075] Example 3 The method is in Example 1, and the difference is:

[0076] (1), for a V 2 O 5 The content of 1.50%, carbon containing is 8.5%, is suspended. The original ore -0.045mm content accounts for 90%.

[0077] (2), the weight is called 2 feed content of 35 kg / h, and the temperature of a decarburized roasting reactor 8 is 600 ° C, the time is 1.2 h, and the temperature of the two-section broken calcination reactor 9 is 950 ° C, and the time is 10 h. .

[0078] (3), the calcination sample is from 10% by weight, the liquid solid ratio is 1.25: 1, and the cumulant (calcium fluoride) is 0.5%, the leaching temperature is 85 ° C, the leaching time is 6 h, and the stirring rotation speed is 1000R. Under the conditions of / min, the vanadium leaching rate of 89.62%, compared to the original mine increased by 28.54 percentage points, compared to the original suspension firing leaching rate by 18.15 percentage points.

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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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