A kind of mica type stone coal extraction v <base:sub> 2</base:sub> o <base:sub> 5</base:sub> and kal(so <base:sub> 4</base:sub> ) <base:sub> 2</base:sub> 12h <base:sub> 2</base:sub> o's method

Abstract

The invention particularly relates to a method for extracting V2O5 and KAl(SO4)2.12H2O from mica-type stone coal. The technical scheme is as follows: the method comprises the following steps: crushing mica-type stone coal raw ore, grinding, and carrying out sulfating roasting to obtain a roasted product; carrying out primary leaching and primary solid-liquid separation on the roasted product to obtain a primary leach solution and a primary leach residue; carrying out secondary leaching on the primary leach residue, carrying out secondary solid-liquid separation to obtain a secondary leach solution and a secondary leach residue, returning the secondary leach solution as a primary leaching agent, and using the secondary leach residue as end tailings; cooling the primary leach solution to crystallize to obtain a crude product and a mother solution, and recrystallizing the crude product to obtain the KAl(SO4)2.12H2O; and extracting the mother solution to obtain an extraction raffinate and a vanadium-rich solution, returning the extraction raffinate as a secondary leaching agent, and precipitating vanadium from the vanadium-rich solution to obtain the product V2O5. The method has the characteristics of high V and K leaching rates, high yield, high production continuity and environment friendliness, and is simple to operate.

Description

technical field [0001] The invention belongs to the technical field of mica type stone coal. Especially relate to a kind of mica type stone coal extraction V 2 o 5 and KAl(SO 4 ) 2 12H 2 O's method. Background technique [0002] Potassium resource reserves in my country are small, unevenly distributed and low self-sufficiency rate. At present, the potassium minerals that have been developed and utilized are mainly brine potassium ore, which cannot meet the needs of our country. Insoluble potassium-containing minerals (mica, potassium feldspar, alunite, etc.) have not been fully utilized due to their low grade and high economic cost of independent development. [0003] Stone coal is a unique vanadium-containing resource in my country. Most vanadium in stone coal exists in mica-like aluminosilicate minerals. When V is extracted from stone coal, the structure of silicate minerals is destroyed, and the valuable element K With V into the leachate and be enriched. Product ...

AI Technical Summary

Problems solved by technology

In this process, the concentration of potassium in the pickling solution is relatively low, adding potassium-rich materials can promote the crystallization of potassium aluminum sulfate, and potassium aluminum sulfate is transformed to obtain potassium-rich materials, and the potassium-rich materials can be added to the pickling solution to crystallize potassium aluminum sulfate. In the process of crystallization of aluminum potassium sulfate to prepare potassium-rich materials, it is necessary to continuously add chemicals to adjust the acidity, the process is complicated, and the recovery effect of the valuable element potassium is not significant