Method for extracting beryllium oxide from low-grade beryllium ore

Abstract

The invention discloses a method for extracting beryllium oxide from low-grade beryllium ore. The method is characterized by comprising the following steps of: grinding the low-grade beryllium ore, pelletizing, drying, roasting, and crushing to obtain a roasted material; adding concentrated sulfuric acid, stirring, leaching, and separating to obtain acidified liquid and acidified slag; adding the acidified liquid into the other roasted material, and stirring and leaching to obtain primary steep and primary leaching residue; adding concentrated sulfuric acid into the primary leaching residue, adding water, and stirring and leaching to obtain secondary steep and secondary leaching residue, wherein the acidified liquid is replaced by the secondary steep for recycling; extracting the primary steep by adopting an extracting agent in a volume ratio of phosphors extracting agents: alkanol: kerosene of (25-45):(5-1):(50-70) to obtain a beryllium-loaded organic phase and raffinate; washing the beryllium-loaded organic phase by adopting solution of oxalic acid, and performing back extraction by using solution of NaOH to obtain a blank organic phase and stripping solution; and regulating the concentration of hydroxyl ions in the stripping solution to ensure that beryllium is hydrolyzed and precipitated, and calcining a precipitate to obtain the beryllium oxide. The method is easy to operate, the cost is low, the beryllium oxide with the content of over 97 percent is obtained, and the recovery rate of the beryllium is about 80 percent. The method is suitable for extracting the beryllium oxide from low-grade beryllium ore with low BeO content and high CaF2 content.

Description

technical field [0001] The invention relates to a method for extracting beryllium oxide from low-grade beryllium ore, in particular to a low BeO content, CaF 2 A method for extracting beryllium oxide from low beryllium and high fluorine beryllium ore. Background technique [0002] Beryllium oxide (BeO) is used as a raw material for the production of beryllium metal, beryllium copper alloy and beryllium oxide ceramics. Due to a series of excellent properties, beryllium oxide ceramics have been continuously developed in the nuclear reactor, aerospace and electronic power sectors, and have become a very important material, and have opened up new uses in the civil industry. [0003] There are about 30 kinds of beryllium-containing ores, and the beryllium-containing minerals with economic value are mainly beryl, silicon beryllite, hydroxysilicate and chrysoberyl. At present, the industrial production of beryllium oxide generally uses beryl ore as raw material, and the main meth...

AI Technical Summary

Problems solved by technology

There are great difficulties in connecting the industrial beryllium oxide with the current production process in the production of non-beryl beryllium ore. There are two main problems to be solved: one is the problem of ore decomposition. In order to convert beryllium into beryllium oxide, which is easily soluble in acid, only a few beryllium ores (such as silicon beryllium yttrium ore) can be directly decomposed by sulfuric acid

The second is the problem of impurity separation. The impurities in beryllium ore can be divided into three categories: the first category is a large amount of conventional impurities, such as aluminum, calcium, iron, silicon, etc.; the second category is difficult to separate impurities, such as phosphorus, which must be Separation by a special process method; the third category is impurities that cause other impurities to be difficult to separate, such as fluorine, which is the most harmful impurity in the production of beryllium oxide by the sulfate method. It mainly causes aluminum to be difficult to separate and affects the hydrolysis of beryllium, resulting in oxidation Poor quality and low recovery of beryllium