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Combined vanadium leaching method for stone coal

A technology of stone coal and stone coal mines, applied in the direction of improving process efficiency, etc., can solve the problems of acid and alkali waste, high content of waste acid, etc., achieve high-efficiency leaching, increase oxidation conversion rate and leaching rate, and increase leaching speed and leaching rate Effect

Inactive Publication Date: 2008-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this technology has a high content of waste acid in the leaching solution, which usually needs to be neutralized with a large amount of alkali, which causes a waste of acid and alkali.

Method used

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  • Combined vanadium leaching method for stone coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: Stone coal contains 0.51% vanadium.

[0013] ① Mix the stone coal ore and the leaching solution according to the liquid-solid ratio of 1.2:1, then put them into the pre-neutralization tank for neutralization reaction, control the temperature in the tank to 85°C, and neutralize for 120 minutes. After the pre-neutralization, the liquid-solid separation is carried out to obtain the pre-neutralization slag and the pre-neutralization liquid with qualified acidity for the next step of vanadium extraction. ②Mix the pre-neutralized slag and the sulfuric acid solution with an acidity of 300g / L according to the liquid-solid ratio of 1.2:1, and then pump it continuously into the atmospheric pressure pre-soaking tank, control the temperature in the tank to 85°C, and pre-soak for 240 minutes. ③After normal pressure prepreg, use a metering pump to directly pump the slurry into the autoclave lined with ceramic tiles, use steam or tap water to control the temperature in t...

Embodiment 2

[0015] Embodiment 2: Stone coal contains 1.84% vanadium.

[0016] ① Mix the stone coal ore and the leaching solution according to the liquid-solid ratio of 1.5:1, then put them into the pre-neutralization tank for neutralization reaction, control the temperature in the tank to 90°C, and neutralize for 210 minutes. After the pre-neutralization, the liquid-solid separation is carried out to obtain the pre-neutralization slag and the pre-neutralization liquid with qualified acidity for the next step of vanadium extraction. ②Mix the pre-neutralization slag and the sulfuric acid solution with an acidity of 350g / L according to the liquid-solid ratio of 1.5:1, and then pump it into the atmospheric pressure pre-soaking tank continuously, control the temperature in the tank to 90°C, and pre-soak for 360 minutes. ③After normal pressure prepreg, use a metering pump to directly pump the slurry into the autoclave lined with ceramic tiles, use steam or tap water to control the temperature i...

Embodiment 3

[0018] Embodiment 3: Stone coal contains 0.21% vanadium.

[0019] ① Mix the stone coal ore and the leaching solution according to the liquid-solid ratio of 1.2:1, then put them into the pre-neutralization tank for neutralization reaction, control the temperature in the tank to 90°C, and neutralize for 60 minutes. After the pre-neutralization, the liquid-solid separation is carried out to obtain the pre-neutralization slag and the pre-neutralization liquid with qualified acidity for the next step of vanadium extraction. ②Mix the pre-neutralization slag and the sulfuric acid solution with an acidity of 30g / L according to the liquid-solid ratio of 1.2:1, and then pump it into the normal-pressure pre-soaking tank continuously. Control the temperature in the tank to 90°C and pre-soak for 60 minutes. ③After normal pressure prepreg, use a metering pump to directly pump the slurry into the autoclave lined with titanium material, use steam or tap water to control the temperature in the...

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Abstract

The invention relates to a new method for jointly leaching vanadium, which adopts the processes of stone coal pre-neutralization, atmospheric pressure pre-impregnation and oxygen leaching. The method comprises following steps: pre-neutralizing acid-consuming impurities in stone coal ore using residual acid in pressure leaching liquor; directly pumping pre-neutralization dreg into a pressure reactor for oxygen pressure intensified leaching after the atmospheric leaching. The new method for jointly leaching vanadium has the advantages of greatly improving the oxidation and transformation rate of the vanadium, high leaching rate of vanadium in stone coal up to 82%, comprehensively utilizing the residual acid in the leaching liquor, high utilization ratio of the residual acid up to 85%, greatly reducing sulfate consumption in vanadium extraction process, and saving production cost.

Description

technical field [0001] The invention belongs to the field of vanadium hydrometallurgy, and more specifically relates to a method for leaching vanadium from vanadium-containing stone coal. Background technique [0002] Stone coal belongs to carbonaceous shale, which is characterized by low calorific value, high ash content, and containing various metal elements. It is a unique vanadium resource in my country. The total reserves of vanadium in coal are 7 times of the total reserves of vanadium in my country's vanadium-titanium magnetite, exceeding the sum of the reserves of vanadium pentoxide in other countries in the world. [0003] At present, the level of vanadium extraction from stone coal in China is extremely disproportionate to the rich reserves of stone coal resources. Enterprises that extract vanadium from stone coal mostly use sodium chemical (calcium method) roasting-acid leaching, oxidation roasting-acid leaching, blank roasting-acid leaching, etc. The trivalent va...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B3/04C22B3/22
CPCY02P10/20
Inventor 魏昶李存兄樊刚邓志敢
Owner KUNMING UNIV OF SCI & TECH
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