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 ...