High-efficient separation and extraction process of silicon and vanadium in stone coal

An extraction process, stone coal technology, applied in the improvement of process efficiency, silicate, alkali metal silicate and other directions, can solve the problems of difficulty in realizing the co-benefits of silicon and vanadium, lack of economical and effective beneficiation methods for vanadium, etc. The effect of reducing tailing discharge, efficient leaching and improving economic benefits

Inactive Publication Date: 2013-04-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above processes are all one-step leaching, only leaching vanadium or leaching a small part of silicon and vanadium together, it is difficult to achieve the common benefits of silicon and vanadium
[0004] The content of vanadium pentoxide in stone coal is generally 0.13% to 1.2%. It is a low-grade vanadium-bearing ore. At present, there is no economical and effective mineral processing method to realize the enrichment of vanadium.

Method used

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  • High-efficient separation and extraction process of silicon and vanadium in stone coal

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Combine 352.4g of stone coal slag crushed below 2mm with 147.6g of Na 2 CO 3 After mixing, 500g of the material was melted at 1400°C for 2 hours, and quickly poured into water to obtain a water-quenched slag. Weigh 200g water-quenched slag and 34.9g NaOH and add it into 332ml water, leaching at 100°C for 4h, then liquid-solid separation, wash the filter cake with 100ml boiling 2% NaOH solution during liquid-solid separation, and then rinse the filter cake with water, the obtained filtrate and The washing solution is water glass, and the filter cake is impregnated with silicon slag for vanadium immersion in the next step. Weigh 100g of silicon leaching slag and add 1g of Ca(ClO) when soaking vanadium 2 , add 300ml concentration and be in the sulfuric acid (volume fraction) of 10%, reflux at 90 ℃ and stir and leach for 2.5h, then liquid-solid separation, the filtrate is the vanadium-containing filtrate, and the filter cake is tailings, discarded. The leaching rate of v...

Embodiment 2

[0024] Mix 400g of raw stone coal ore crushed to below 2mm with 150g of Na 2 CO 3 After mixing, 550g of the material was melted at 1400°C for 2 hours, and quickly poured into water to obtain a water-quenched slag. Weigh 200g water-quenched slag and 34.9g NaOH and add it to 332ml water, leaching at 100°C for 4h, then liquid-solid separation, wash the filter cake with 100ml boiling 2% NaOH solution during liquid-solid separation, and then wash the filter cake with water, the obtained filtrate is It is water glass, and the filter cake is impregnated with silicon slag for the next step of impregnating vanadium. When immersing vanadium, weigh 100g of silicon leaching slag and add 0.2g of KClO 4 , add 300ml concentration and be in the sulfuric acid (volume fraction) of 10%, reflux at 60 ℃ and stir leaching for 3h, then liquid-solid separation, filtrate is vanadium-containing filtrate, filter cake is tailings, discards. The leaching rate of vanadium was 91.8%, and the total recove...

Embodiment 3

[0026] Mix 400g of stone coal slag crushed to below 2mm with 100g of NaHCO 3 After mixing, 500g of the material was melted at 1400°C for 1 hour, and quickly poured into water to obtain a water-quenched slag. Weigh 200g water-quenched slag and 34.9g NaOH and add it to 332ml water, leaching at 100°C for 4h, then liquid-solid separation, wash the filter cake with 100ml boiling 1% NaOH solution during liquid-solid separation, and then rinse the filter cake with water, the obtained filtrate is It is water glass, and the filter cake is impregnated with silicon slag for the next step of impregnating vanadium. Weigh 100g of silicon leaching slag and add 0.2g of KMnO when impregnating vanadium 4 , add 300ml concentration and be in the hydrochloric acid (volume fraction) of 10%, at 50 ℃ of reflux stirring leaching 3h, then liquid-solid separation, filtrate is exactly vanadium-containing filtrate, and filter cake is tailings, discards. The leaching rate of vanadium was 91.1%, and the t...

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Abstract

The invention provides a high-efficient separation and extraction process of silicon and vanadium in stone coal. In the invention, sodium carbonate (or sodium bicarbonate, sodium hydroxide and the like) is taken as a roasting additive and mixed with stone coal cinders or the stone coal, then melting and water-quenching are performed so as to obtain water-quenched slag, silicon is firstly leached in a sodium hydroxide solution, and vanadium leaching is further performed on the filter slag after completing the leaching of the silicon through a sulfuric acid solution, thereby realizing the high-efficient step-by-step extraction of the silicon and the vanadium. By adopting the process provided by the invention, the step-by-step extraction of the silicon and the vanadium and the high-efficientleaching of the vanadium and the silicon can be realized, the leaching rate of the vanadium is above 90%, the recovery rate of the vanadium is above 80%, and the leaching rate and the recovery rate of the silicon are above 80% respectively. Simultaneously, through the invention, the economic benefits are improved, and the emission of tailings is reduced by above 60%.

Description

technical field [0001] The invention relates to a method for efficiently extracting silicon and vanadium resources from stone coal. Background technique [0002] The vanadium-containing minerals that can be mined and utilized in my country are mainly vanadium-titanium magnetite and stone coal. It is estimated that the vanadium content in stone coal in my country is 7 times that in vanadium-titanium magnetite, accounting for 87% of my country's vanadium reserves. %, but the main source of vanadium in my country is still vanadium-titanium magnetite. Stone coal contains a huge amount of vanadium ore resources, and the development of the vanadium resources contained in it is of great significance. With the rapid development of the national economy, the amount of vanadium is also increasing year by year, which makes my country accelerate the development and utilization of stone coal. The main component of stone coal is quartz, but the current technology only extracts vanadium fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B1/00C22B34/22C01B33/32
CPCY02P10/20
Inventor 张国范冯其明刘琨闫继武欧乐明卢毅屏
Owner CENT SOUTH UNIV
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