Low-cost method for cleanly extracting vanadium from vanadium slag
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A low-cost, vanadium slag technology, applied in the field of vanadium slag cleaning and vanadium extraction at low cost, can solve the problems of wastewater and solid waste, achieve the effects of small washing water, lower production costs, and easy washing
Inactive Publication Date: 2020-02-07
SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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[0003] In view of this, for the deficiencies in the prior art, the object of the present invention is to provide a method for cleanly extracting vanadium from low-cost vanadium slag, to solve the problem of solid waste and waste water produced by the current vanadium slag extraction process proposed in the above-mentioned background technology. question
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Embodiment 1
[0028] The composition of the following vanadium slag is (%):
[0029] TV TFe CaO TiO 2
SiO 2
P MgO MnO Al 2 O 3
9.55 29.3 2.48 13.3 14.65 0.052 2.4 8.6 2.55
[0030] Mix the vanadium slag and calcium oxide with different ratios and then roast to obtain roasted clinker. The roasting temperature is 850°C and the roasting time is 90min. and vanadium-containing leaching solution to detect the vanadium content (TV) in the residue and the vanadium transfer rate. For the specific results, see figure 2 shown.
[0031] from figure 2 It can be seen that the method of the present invention adopts alkali leaching, and the allowable range of calcium oxide ratio fluctuation is large. When the amount of calcium oxide added is 0-8%, the content of vanadium in the residue is about 1%, and the conversion rate of vanadium basically reaches 1%. 90%.
[0032] Add 5% calcium oxide to the vanadium slag and mix it for 90min to obtain calci...
Embodiment 2
[0036] A method for cleaning vanadium extraction from low-cost vanadium slag, comprising the following steps:
[0037] (1) vanadium slag roasting: 10g vanadium slag and 0.4g calcium oxide are mixed, then gained mixed material is roasted to obtain roasting clinker;
[0038] It was calcined in a muffle furnace at 800 °C for 90 min.
[0039] The composition of vanadium slag used in this example is the same as in Example 1.
[0040] (2) Alkaline leaching: the roasted clinker obtained in step (1) is put into a sodium carbonate solution for alkali leaching, and after solid-liquid separation, residue and vanadium-containing leaching solution are obtained. The leaching time is 0.5h, and the ratio of leaching liquid to solid is 4:1. After testing, the leaching rate of vanadium is 94.2%.
[0041] (3) purification: the residue is washed with clear water, the washing solution is concentrated and mixed with the vanadium-containing leachate to obtain a vanadium-containing mixed solution, ...
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Abstract
The invention discloses a low-cost method for cleanly extracting vanadium from vanadium slag. The method comprises four steps of roasting the vanadium slag, carrying out alkaline leaching, purifying and precipitating the vanadium, wherein the vanadium slag and calcium oxide are mixed and then roasted to obtain roasted clinker; the roasted clinker is subjected to alkaline leaching to obtain residues and vanadium-containing leaching liquid; after the residues are cleaned, washing liquid is concentrated and is mixed with the vanadium-containing leaching liquid to obtain vanadium-containing mixedliquid; the vanadium-containing mixed liquid and calcium chloride are mixed to obtain a sodium vanadate solution; the sodium vanadate solution is added into an ammonium chloride solution and is subjected to solid-liquid separation to obtain ammonium metavanadate sediment and vanadium precipitation wastewater; the vanadium precipitation wastewater returns to the alkaline leaching step and is used for carrying out alkaline leaching on the roasted clinker. According to the low-cost method for cleanly extracting the vanadium from the vanadium slag, provided by the invention, the allowable CaO ratio and the roasting temperature fluctuation range are large and the solid ratio of the leaching liquid is small; industrialization is facilitated; the leached residues are easy to wash and the washingwater amount is small; the vanadium precipitation wastewater is directly and circularly leached out calcified clinker, so that the wastewater treatment amount can be greatly reduced; the Si concentration of the leaching liquid leached by alkaline liquid is low and the quantity of impurity-removed residues obtained in an impurity removing process is small.
Description
technical field [0001] The invention relates to the technical field of vanadium extraction chemical industry, in particular to a method for clean vanadium extraction from low-cost vanadium slag. Background technique [0002] Vanadium slag refers to a kind of slag rich in vanadium oxides and iron oxides by oxidation of vanadium-containing molten iron through converter blowing and other methods. The main chemical components of vanadium slag are FeO, V 2 O 5 , SiO 2 , MgO, MnO, which are the main raw materials for vanadium extraction, there are many methods for vanadium extraction from vanadium slag at present, and the methods commonly used in the industry are sodium roasting and calcification roasting. Sodium roasting is a mixed roasting of sodium salt and vanadium slag to convert low-valent vanadium into soluble sodium vanadium salt and then leaching. However, during sodium roasting, due to NaCl, Na 2 SO 4 The decomposition of sodium salts will produce Cl 2 , SO 2 At ...
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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02C22B34/22
CPCC22B1/02C22B7/008C22B7/04C22B34/22Y02P10/20
Inventor 张仲曦尹文游思林徐瑜尹丽胡晋杰
Owner SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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