Method for preparing low-silicon and low-phosphorous vanadium liquid

Abstract

The invention provides a method for preparing low-silicon and low-phosphorous vanadium liquid, which can be used for removing silicon and phosphorous by adding purifying agent into a vanadium liquid system in the process of leaching the vanadium liquid from vanadium-containing clinker or dissolving crude vanadium product. The method comprises the steps of: a. setting the leaching temperature of the vanadium-containing clinker or the dissolving temperature of the crude vanadium product to be any in the range between 60 DEG C to boiling temperature; b. using acid or alkali to adjust the corresponding vanadium liquid system obtaining in the step a to be alkaline, adding the purifying agent to remove silicon and phosphorous, and selecting at least one from aluminum salt, ferric salt and magnesium salt as the purifying agent; and c. after the step b, cooling, filtering and obtaining the low-silicon and low-phosphorous vanadium liquid. Compared with the existing vanadium extraction technique, the method has the advantages of being simple and easy use in technique, loose in content requirement of the vanadium liquid, low in equipment requirement, convenient for operation, low in cost and high in grade, synchronously removing silicon and phosphorous, etc.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction by wet method, and more specifically, relates to a method for preparing low-silicon and low-phosphorus vanadium liquid. Background technique [0002] The existing technology uses vanadium slag as raw material to produce V 2 o 5 Generally speaking, there are mainly five processes of raw material pretreatment (including vanadium slag crushing, crushing, batching, mixing), oxidation roasting, clinker leaching, vanadium precipitation and melting, among which the clinker leaching There are usually two types of processes: continuous and batch, which are used to leach vanadium from the vanadium-containing clinker obtained by oxidation roasting to obtain vanadium liquid, while impurity elements enter the residue. [0003] The increase in the content of impurity elements such as phosphorus and silicon is very unfavorable to the vanadium precipitation process and the quality of vanadium produc...

AI Technical Summary

Problems solved by technology

Mainly reflected in the following aspects: 1. Phosphorus and silicon will seriously affect the precipitation rate in the vanadium precipitation process, thereby reducing the recovery rate of vanadium element

The book "Vanadium and Titanium Materials" published by Metallurgical Industry Press in 2007 mentioned that for the ammonium salt vanadium precipitation process mainly used in industrial production, when the pH value of the vanadium precipitation is controlled at about 2.5, [V 2 o 5 ] / [P] When the molar ratio is less than 178, the precipitation rate of the ammonium salt vanadium precipitation process will drop sharply, when [V 2 o 5 ] / [Si] When the molar ratio is less than 2.56, the precipitation rate of the ammonium salt vanadium precipitation process will decrease, and the time required for precipitation will start to prolong, making filtration difficult

2. The impurities of phosphorus and silicon will affect the quality of vanadium products, and will affect the quality of products such as high-vanadium iron obtained in subsequent production

The technical solution of this invention is only limited to the purification of vanadium liquid after roasting, ion exchange and desorption of vanadium ore, and does not involve the dissolution of vanadium liquid leached from vanadium slag clinker, vanadium liquid obtained by direct leaching of vanadium ore and crude vanadium products Purification of vanadium liquid with complex components such as the obtained vanadium liquid; and the adjustment of pH value is limited to hydrochloric acid, the purification pH value is limited to 8-9, and the purifying agent is only aluminum sulfate; and the technical solution of the invention does not produce low-silicon, low- Phosphorous vanadium solution

[0006] In summary, it can be seen that the vanadium liquid purification method of the prior art has certain limitations for simultaneously removing silicon and phosphorus to produce low-silicon and low-phosphorus vanadium liquid, and does not involve directly leaching vanadium liquid and crude vanadium from vanadium ore. Purification of vanadium liquid with complex components such as vanadium liquid obtained from product dissolution, and the purification effect is not ideal

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