Method for extracting beryllium from alexandrite-type beryllium concentrate with low enrichment ratio
A technology of chrysoberyl and beryllium concentrate, which is applied in the direction of improving process efficiency, can solve the problems of high impurity content and unfavorable beryllium recovery, and achieve the effects of high product quality, simple and feasible production operation, and low acidity
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[0017] Example 1
[0018] Raw material: golden emerald type beryllium concentrate, with a BeO content of 1.31% and a fluorine content of 5.46%,
[0019] (1) Pretreatment: Pretreat the beryllium concentrate with a 3mol / L hydrochloric acid solution with a liquid-to-solid ratio of 2:1. Pretreat the concentrate to wash away most of the impurities such as iron and magnesium carbonate. After lime neutralization, the solution recovers calcium chloride, magnesium hydroxide, etc., and the loss rate of beryllium is 2%;
[0020] (2) Acidification roasting: add concentrated sulfuric acid to the pretreatment material obtained in step (1) according to the acid-ore ratio of 1:0.8, acidify roasting for 0.5h at a temperature of 400℃, and roasting flue gas is HF and SiF 4 , H 2 O, solid particles, etc., flue gas undergoes dust collection and impurity removal treatment to recover hydrofluoric acid, etc., and the obtained roasting slag is ball milled to 100 mesh, and the roasting loss rate is 5%;
[0021...
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[0026] Example 2
[0027] Raw material: golden emerald type beryllium concentrate, BeO content is 1.53%, fluorine content is 6.13%,
[0028] (1) Pretreatment: Pretreat the beryllium concentrate with a 5mol / L hydrochloric acid solution with a liquid-to-solid ratio of 3:1. Pretreat the concentrate to wash away most of the impurities such as iron and magnesium carbonate. After lime neutralization, the solution recovers calcium chloride, magnesium hydroxide, etc., and the loss rate of beryllium is 2%;
[0029] (2) Acidification roasting: add concentrated sulfuric acid to the pretreatment material obtained in step (1) according to the acid-to-ore ratio of 1:1.2, and acidify roasting for 1.5h at a temperature of 500℃, and roasting flue gas is HF and SiF 4 , H 2 O, solid particles, etc., flue gas undergoes dust collection and impurity removal treatment to recover hydrofluoric acid, etc., and the obtained roasting slag is ball milled to 120 mesh, and the roasting loss rate is 5%;
[0030] (3)...
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