Composite additive used for roasting vanadium extracting and use method of additive

Abstract

The invention relates to the technical field of metallurgy, and provides a composite additive used for roasting vanadium extracting. The additive is formed through the step that four materials including, by mass part, 35 parts to 55 parts of sodium materials, 15 parts to 25 parts of calcium materials, 0.5 part to 1 part of vanadium materials and 1 part to 5 parts of titanium materials are mixed and ground to 80 meshes to 100 meshes; the invention further provides a use method of the composite additive used for roasting vanadium extracting. The use method comprises following steps: A, mixing, wherein screened vanadium containing raw materials are selected, and a mixed material with the evenly-mixed composite additive is added; B, roasting, wherein the mixed material is subject to two-time roasting. According to the composite additive and the use method of the additive, the vanadium-contained ore is not likely to generate a liquid phase in the roasting process, the phenomenon of equipment bonding is avoided, toxic and harmful substances are not likely to be generated, the conversion rate and the purity of vanadium can be effectively improved, the roasting time is shortened, the roasting process is simplified, production cost is reduced, and process efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a composite additive for roasting and extracting vanadium and an application method thereof. Background technique [0002] Vanadium is a widely distributed trace element on the earth, its content accounts for about 0.02% of the earth's crust, and it is relatively easy to obtain. Due to its many excellent physical and chemical properties, vanadium has a wide range of uses. It is known as the metal "vitamin" and is an indispensable and important material for the development of modern industry, modern national defense and modern science and technology. Vanadium mainly exists in ores in a stable low-valence state (trivalent) in nature. Vanadium in this valence state is not easily soluble in acid-base solutions. To effectively dissolve vanadium from ores, it is necessary to dissolve the ores The vanadium in the vanadium changes from a low-valence state to a high-valence state (qua...

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Problems solved by technology

A single calcium salt additive does not generate Cl during roasting 2 Or polluting gases such as HCl, but this additive has great selectivity to vanadium-containing ores, and the conversion rate of vanadium is low, so it is not suitable for industrial applications

CN101215648A discloses a roasting method using a calcium salt composite roasting additive, but this method is suitable for roasting up to 7 hours at 870°C-980°C, the roasting time is long, and the roasting temperature is too high

[0012] CN102296192A discloses a mixture of sodium fluoroaluminate (mass fraction 35%-45%), calcium fluoride (mass fraction 40%-50%) and alkali metal peroxide (mass fraction 15%-25%) However, the cost of alkali metal peroxide in this composite additive is high and it is easy to decompose, which is prone to safety hazards during the decomposition process. At the same time, the fluorine content in the additive is too high, which will easily lead to relatively high fluorine content in the mine. More impurities are leached out, greatly reducing the purity of subsequent vanadium products

CN101613797A also discloses a kind of NaCl, CaF 2 and CaCO 3 Composed of composite additives, the additive needs to add 5% to 40% of water in the process of use. The addition of water needs to be equipped with a drying device before roasting. The process is relatively complicated, which increases the production cycle and cost.

[0016] CN101693947A discloses a composite additive composed of nitrate and aluminum hydroxide, but nitrate is easy to decompose at high temperature to produce nitrogen oxides, which pollutes the environment more. At the same time, the roasting process of the additive is relatively complicated and the production efficiency is low

CN101693946A discloses a composite additive made of tungsten oxide and titanium oxide, but the composite additive needs to be pre-mixed into a slurry, and can be roasted after drying. The drying process takes a long time, about 4h to 14h, and the roasting The final ore needs to be leached at a temperature of about 50°C to 100°C, and the efficiency of the entire extraction process is low

[0017] It can be seen from the above analysis that the process of adding composite additives is the first choice in the process of roasting vanadium extraction, and the composite additives also play a pivotal role in the process of roasting vanadium extraction. There are problems such as easy generation of liquid phase, bonding equipment, long roasting time, complicated process, high cost, low production efficiency, low conversion rate and purity of vanadium, and easy production of harmful and toxic substances. It is the current vanadium extraction technology. Difficulties in

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