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A stone coal and extraction technology, applied in the field of metallurgy and chemical industry, can solve the problems of complex process, large consumption of reagents, high cost, etc., and achieve the effect of simple process, easy operation and reduced production cost
Active Publication Date: 2013-12-11
CENT SOUTH UNIV
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However, the current methods for removing silicon in alkaline solutions are generally cumbersome, and will take away part of the vanadium while removing silicon, which will have an adverse effect on the subsequent solvent extraction. Therefore, the process is complicated, the consumption of reagents is large, and the cost higher
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Embodiment 1
[0036] according to figure 1 The process flow is operated.
[0037] The content of vanadium pentoxide in stone coal roasting material is 1.2806%;
[0038] The leaching agent is anhydrous sodium carbonate, which is prepared into a 3% solution;
[0039] Conditions: liquid-solid ratio 1 / 1, time 2h, normal pressure, the amount of sodium carbonate added is 3% of the mass of stone coal roasting material (100 grams of calcined sand is added with 3 grams of sodium carbonate);
[0040] First, add anhydrous sodium carbonate to pure water at room temperature, stir to dissolve, heat to different temperatures in a water bath, and then add stone coal roasting material to it for leaching. The results are shown in Table 1.
[0041] The experimental results of leaching under different temperature conditions in table 1
[0042] temperature / ℃
[0043] The results showed that more than 50% of vanadium was leached at 10-90°C.
Embodiment 2
[0045] Raw material is with embodiment 1.
[0046] The leaching agent is anhydrous sodium carbonate (analytical pure);
[0047] Conditions: liquid-solid ratio 1 / 1, time 1h, normal pressure, temperature 80°C;
[0048] First, add anhydrous sodium carbonate to pure water at room temperature to make different concentrations (the first line of Table 2), stir to dissolve, heat in a water bath at 80°C, and then add stone coal roasting material to it for leaching. The results are shown in the table 2.
[0049] Table 2 Leaching test results under different leaching agents
[0050] Leaching agent / %
Embodiment 3
[0052] Raw material is with embodiment 1. The leaching agent is sodium carbonate solution;
[0053] Conditions: liquid-solid ratio 1 / 1, time 1h, normal pressure, temperature 80°C;
[0054] First, add anhydrous sodium carbonate to pure water at room temperature, stir and dissolve into a 10% aqueous solution, heat it in a water bath at 80°C, and then add stone coal roasting material to it for leaching. The vanadium leaching rate is 60.2%.
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Abstract
The invention discloses a method of extracting vanadium from stone coal. The method comprises the following steps: 1) using sodium carbonate and sodium hydroxide mixed solution to soak stone coal calcined material to obtain lixivium; 2) adding hydrogen peroxide; 3) using organic composition 40-60% A + 10-30% B + 20-40% C to extract the lixivium with hydrogen peroxide; 4) using sodium carbonate or odium carbonate and sodium hydroxide mixed solution to reextract out organic phase. Due to usage of direct extraction, the raffinate containing sodium carbonate and sodium hydroxide can be recycled for soaking; and the raffinate is used for preparing vanadium pentoxide. Compared with the existing alkaline leaching-ion exchange technology, a lixivium neutralizing procedure, a reextraction purifying procedure and a procedure of processing and discharging the raffinate are reduced, thus the production cost of vanadium pentoxide is greatly reduced, and the wastewater discharge is reduced. The extraction agent is better in selectivity, so that during the extraction process, vanadium is separated from impurities, and the reextraction liquid can be processed with vanadium precipitation-calcining to obtain the vanadium pentoxide product.
Description
technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for extracting vanadium from stone coal mines. Background technique [0002] Stone coal is a unique vanadium resource in my country with extremely rich reserves, and it is also an important resource for vanadium extraction in my country. [0003] There are many techniques for extracting vanadium from stone coal, mainly including i. sodium roasting-water leaching process, ii. stone coal mine blank roasting-acid leaching-ion exchange (P204 extraction or N235 extraction) process, iii. stone coal mine acid leaching -P204 extraction process, iv. stone coal mine blank roasting-alkali leaching-ion exchange process, etc. Since the sodium roasting-water leaching process has been banned in most parts of the country due to environmental protection issues, it is being phased out gradually; the stone coal mine acid leaching-P204 extraction process and the ...
Claims
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