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Coarse and fine grading oxidizing roasting vanadium extraction system for stone coal vanadium ore and oxidizing roasting method

A technology of graded oxidation and oxidative roasting, which is applied in the field of vanadium extraction from stone coal vanadium ore. It can solve the problems of wide particle size range, large content of coarse and fine particles, etc., and achieve improved vanadium leaching rate, low energy consumption, and improved energy utilization rate. Effect

Pending Publication Date: 2022-03-04
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] Aiming at the problem that stone coal vanadium ore generally has a wide particle size range and large content of coarse and fine particles in the prior art, the purpose of the present invention is to provide a vanadium extraction system and oxidation roasting method for coarse and subdivision oxidation roasting of stone coal vanadium ore

Method used

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  • Coarse and fine grading oxidizing roasting vanadium extraction system for stone coal vanadium ore and oxidizing roasting method
  • Coarse and fine grading oxidizing roasting vanadium extraction system for stone coal vanadium ore and oxidizing roasting method
  • Coarse and fine grading oxidizing roasting vanadium extraction system for stone coal vanadium ore and oxidizing roasting method

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Experimental program
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Effect test

Embodiment 1

[0055] Coarsely graded oxidation roasting of a certain stone coal vanadium ore, where V 2 o 5 The content is 1.25%, the -0.038mm content is 61%, and the +0.1mm content is 23%.

[0056] (1), start the Roots blower 18, control the negative pressure of the blower to be -3.0kpa, provide the negative pressure inside the system to start the burner 20 to ignite the natural gas, so that the high-temperature flue gas enters the main furnace 7. Keep the temperature at the top of the main furnace 7 at about 720°C.

[0057] (2), 2.5m into the flow sealing valve 5 3 / h loose wind (air), 2.8m 3 / h fluidization wind (air); feed 5m into the coarse-grained roasting reactor 9 3 / h loose wind (air), 20m 3 / h fluidization wind (air); feed 4.4m into fine grain roasting reactor 13 3 / h loose wind (air), 19m 3 / h fluidization wind (16m 3 / h air, 3m 3 / h oxygen).

[0058] (3) Set the feeding of the weight loss scale 2 to 120kg / h, and carry out the sealing operation. When the output is stable...

Embodiment 2

[0065] Embodiment 2 method is the same as embodiment 1, and difference is:

[0066] (1), for a certain V 2 o 5 The stone coal vanadium ore with a content of 0.82% is roasted. The raw ore -0.038mm content is 79%, +0.1mm content is 19%.

[0067] (2), the feed rate is 35kg / h, the temperature of the coarse-grain roasting reactor 9 is 910°C, and the roasting time is 24h; the temperature of the fine-grain roasting reactor 13 is 900°C, and the roasting time is 22h.

[0068] (3) The amount of concentrated sulfuric acid used in the roasted sample is 12wt%, the liquid-solid ratio is 1.1:1, the amount of leaching aid (calcium fluoride) is 2.25%, the leaching temperature is 85°C, the leaching time is 8h, and the stirring speed is 680r / min, the leaching rate of vanadium reaches 85.92%, which is 29.58 percentage points higher than that of raw ore, and 7.28 percentage points higher than that of non-graded roasted materials.

Embodiment 3

[0070] Embodiment 3 method is the same as embodiment 1, and difference is:

[0071] (1), for a certain V 2 o 5 The stone coal vanadium ore with a content of 1.46% is roasted. Raw ore -0.038mm content is 65%, +0.1mm content is 29%.

[0072] (2), the feeding rate is 32kg / h, the temperature of the coarse-grain roasting reactor 9 is 950°C, and the roasting time is 30h; the temperature of the fine-grain roasting reactor 13 is 940°C, and the roasting time is 25h.

[0073] (3) The amount of concentrated sulfuric acid used in the roasted sample is 15wt%, the liquid-solid ratio is 1.25:1, the amount of leaching aid (calcium fluoride) is 3.5%, the leaching temperature is 90°C, the leaching time is 10h, and the stirring speed is 1000r / min, the leaching rate of vanadium reaches 80.62%, which is 29.71 percentage points higher than that of the original ore, and 10.03 percentage points higher than the original one-stage suspension roasting material leaching rate.

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Abstract

The invention provides a stone coal vanadium ore coarse and fine grading oxidizing roasting vanadium extraction system and an oxidizing roasting method. The system comprises a feeding system composed of a stock bin, a weightlessness scale and a spiral feeding pipe; the coarse grain material oxidizing roasting system consists of a first-stage cyclone separator, a flow sealing valve, a main furnace, a second-stage cyclone separator and a coarse grain roasting reactor; the fine particle material oxidizing roasting system consists of a three-stage cyclone separator and a fine particle roasting reactor; the negative pressure dust removal system consists of an exhaust heat exchanger, a bag-type dust remover, a Roots blower and a chimney; the heat recovery system consists of a heat exchanger, a first first-section cooler, a first second-section cooler, a second first-section cooler, a second second-section cooler and a heat exchange air inlet pipe; by arranging the coarse particle roasting reactor and the fine particle roasting reactor, operation parameters in the roasting process of the coarse particle stone coal and the fine particle stone coal can be independently controlled, then the leaching rate of vanadium in a roasted sample is increased, the heat utilization rate is greatly increased, and the energy consumption of the system is greatly reduced.

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 coarse and subdivided stone coal vanadium ore. Background technique [0002] The current techniques for extracting vanadium from stone coal mainly include sodium roasting-water leaching, calcification roasting-acid (alkali) leaching, composite additive roasting-leaching, additive-free oxidative roasting-acid (alkali) leaching and direct leaching, etc. As a fluidized roasting technology, suspension roasting has the advantages of sufficient gas-solid contact, high mass and heat transfer efficiency, low operating cost, energy saving and environmental protection. In particular, the NEUH series suspension roasting industrialization equipment and technology have made certain technological breakthroughs in the efficient utilization of refractory minerals such as refract...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B34/22
CPCC22B1/02C22B34/22Y02P10/20
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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