Method for extracting vanadium by using vanadium slag mixed alkali roasting

A technology of mixing alkali and roasting, which is applied in the field of vanadium chemical industry and metallurgy. It can solve the problems of high roasting temperature, pollute the environment, reduce the roasting holding time, etc., and achieve the effects of reducing the degree of sintering, increasing the conversion rate, and increasing the rate of leaching

Inactive Publication Date: 2015-04-08
HEBEI IRON AND STEEL
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The recovery rate of vanadium in the sodium roasting process is low, the recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 85%; the roasting temperature is high (750-850 ° C), and multiple roasting is required , high energy consumption; in the roasting process will produce harmful HCl, Cl 2 and other corrosive gases, polluting the environment
[0003] Chinese patent CN101215005A proposes a method for roasting vanadium slag and sodium salt (sodium carbonate, sodium chloride) or potassium salt (potassium carbonate, potassium chloride). This patent is suitable for high-silicon and low-vanadium vanadium slag, and the roasting temperature is 700 ~820°C, multi-temperature stage roasting, by controlling the temperature system and salt ratio, it can prevent the furnace material from sintering, make the process go smoothly, and also reduce the roasting holding time, and the V in the tailings 2 o 5 The conten

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  • Method for extracting vanadium by using vanadium slag mixed alkali roasting

Examples

Experimental program
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Effect test

Example Embodiment

[0018] Example 1: figure 1 As shown, the process steps of this vanadium slag mixed alkali roasting method for extracting vanadium are as follows:

[0019] (1) Ingredients: 1kg vanadium slag and 50g Na 2 CO 3 , 50g of NaOH, stir and mix, the vanadium slag contains V 2 O 5 10wt%;

[0020] (2) Roasting: the mixture enters the rotary kiln and is heated to 800℃ to react for 2h, the O in the rotary kiln 2 The volume content is 11% to obtain roasted clinker;

[0021] (3) Leaching: leaching the roasted clinker obtained in step (2) in 80°C water, the pH of the leaching solution is 11; then filtering is performed to obtain vanadium extraction tailings and a vanadium-containing eluate.

[0022] After testing and calculation, the conversion rate of vanadium in this example is 98%.

Example Embodiment

[0023] Example 2: The process steps of the method for extracting vanadium by mixed alkali roasting of vanadium slag are as follows:

[0024] (1) Ingredients: 1kg vanadium slag and 20g Na 2 CO 3 , 180g of NaOH, stir and mix, the vanadium slag contains V 2 O 5 20wt%;

[0025] (2) Roasting: the mixture enters the rotary kiln and is heated to 600℃ to react for 3h, the O in the rotary kiln 2 The volume content is 5% to obtain roasted clinker;

[0026] (3) Leaching: the roasted clinker obtained in step (2) is leached in water at 90°C, and the pH of the leaching solution is 9; then, filtering is performed to obtain vanadium extraction tailings and vanadium-containing eluate.

[0027] After testing and calculation, the conversion rate of vanadium in this example is 99%.

Example Embodiment

[0028] Embodiment 3: The process steps of the method for extracting vanadium by mixed alkali roasting of vanadium slag are as follows:

[0029] (1) Ingredients: 1kg vanadium slag and 20g Na 2 CO 3 , 30g of NaOH, stir and mix well, the vanadium slag contains V 2 O 5 11wt%;

[0030] (2) Roasting: the mixture enters the rotary kiln and is heated to 750℃ to react for 4h, the O in the rotary kiln 2 The volume content is 15% to obtain roasted clinker;

[0031] (3) Leaching: The roasted clinker obtained in step (2) is leached in water at 60°C, and the pH of the leaching solution is 14; then, filtering is performed to obtain vanadium extraction tailings and a vanadium-containing eluate.

[0032] After testing and calculation, the conversion rate of vanadium in this example is 95%.

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Abstract

The invention discloses a method for extracting vanadium by using vanadium slag mixed alkali roasting. The method comprises the following process steps: (1) uniformly mixing vanadium slag, Na2CO3 and NaOH mixed alkali, performing oxidizing roasting in a calcining kiln, thereby obtaining the roasted clinker; (2) leaching the roasted clinker by using water, controlling the pH value of the leaching solution to be 9-14, performing solid-liquid separation, thereby obtaining the leaching slag and the vanadium liquid. According to the method for extracting vanadium by virtue of mixed alkali roasting and water leaching, due to the absence of addition of sodium chloride and sodium sulfate salts, toxic and harmful gases are not produced; the mixed alkali roasting is adopted, and the immersion ratio of vanadium is higher than 95 percent; and moreover, the mixed alkali roasting temperature is reduced by 50-150 DEG C compared with pure alkali roasting, a sintering phenomenon is avoided in the roasting process, the energy consumption increased by ball-milling and roasting of the clinker at the later stage is eliminated, and the method is a clean and high-efficiency vanadium extraction method.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, and in particular relates to a method for extracting vanadium by roasting vanadium slag mixed with alkali. Background technique [0002] Vanadium slag is a vanadium-enriched material produced by blowing vanadium-containing molten iron in the presence of oxygen-containing gas. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for vanadium extraction. Enterprises that use vanadium-titanium magnetite as raw materials to produce iron and vanadium products currently use the traditional vanadium slag sodium roasting process to extract vanadium from vanadium slag, such as my country's Panzhihua Iron and Steel Corporation, Chenggang Iron and Steel Co., Ltd. in South Africa, and New Zealand Iron and Steel Co., Ltd. Companies and so on are using the above process. The basic principle of sodium roasting process ...

Claims

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Application Information

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IPC IPC(8): C22B34/22
CPCY02P10/20
Inventor 李兰杰白瑞国陈东辉
Owner HEBEI IRON AND STEEL
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