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Circulating graded leaching method of stone coal acid-leaching vanadium extraction sulfuric acid

A stone coal acid and leaching technology, which is applied in the direction of improving process efficiency, can solve problems such as increasing costs, and achieve the effect of reducing the amount of sulfuric acid and reducing the concentration of residual acid

Inactive Publication Date: 2011-11-23
BAOJING TIANRUI VANADIUM
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Problems solved by technology

However, the use of catalysts and leaching aids not only increases the cost, but also brings new environmental problems

Method used

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  • Circulating graded leaching method of stone coal acid-leaching vanadium extraction sulfuric acid
  • Circulating graded leaching method of stone coal acid-leaching vanadium extraction sulfuric acid

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Embodiment Construction

[0007] Minerals are heated to 90-120°C with a vanadium-containing sulfuric acid solution of 1.3-1.5 molar concentration at a liquid-solid ratio of 0.35:0.65 in A leaching stirring tank, and soaked for 8-12 hours. The occurrence of sulfuric acid and minerals is shallow , Higher valence vanadium oxide reacts to generate tetravalent vanadium oxide, sulfate and water, tetravalent vanadium dissolves into the acid solution, at the same time, the hydrogen ion in the solution is greatly reduced, and the acidity of the solution is reduced to 0.2 moles. When the pH value is 2.5, the solid-liquid separation is carried out by a vacuum belt filter, and the liquid phase (also known as A leachate) is directly sent to the subsequent process for reduction and extraction; the solid phase enters the B leaching stirring tank, and the liquid-solid ratio is 0.35:0.65. The concentrated sulfuric acid solution with 3 molar concentration is heated to 90-120°C and soaked for 24-44 hours. More than 90% of...

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Abstract

The invention relates to a circulating graded leaching method of stone coal acid-leaching vanadium extraction sulfuric acid, which comprises steps as follows: two leaching agitator tanks A and B are adopted, and a liquid phase which is separated after minerals are subjected to acid leaching treatment by the leaching agitator tank A is directly used for reduction and extraction treatment; the separated solid phase enters the leaching agitator tank B, and is subjected to further acid leaching treatment; and the separated leaching solution B returns to the leaching agitator tank A so as to soak the newly added minerals. Compared with the existing acid-leaching vanadium extraction method, the invention reduces the consumption of sulfuric acid in the stone coal leaching process, lowers the concentration of spent acid in the leaching solution A, does not need to add alkali for neutralization in the post processing, and can not cause new environmental protection problem; and the leaching rate is higher than 90%.

Description

technical field [0001] The invention relates to a sulfuric acid cyclic and fractional leaching method for acid leaching vanadium from stone coal. Background technique [0002] Vanadium is an important industrial raw material and has the reputation of "modern industrial monosodium glutamate". The traditional roasting process has low utilization rate of resources and serious environmental pollution, so it has been gradually eliminated. Vanadium extraction by sulfuric acid leaching is the development direction of vanadium extraction from stone coal. The occurrence state of vanadium in stone coal is complicated, and vanadium exists as oxides in various valence states. When extracting vanadium by acid leaching, 20%-30% concentrated sulfuric acid must be added to convert and leaching the vanadium oxide wrapped in the deep part of the ore grains. However, the accompanying problem is that the residual acid in the leaching solution is too high, and a large amount of alkali needs to...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B34/22
CPCY02P10/20
Inventor 胡嘉陈博
Owner BAOJING TIANRUI VANADIUM
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