Method for preparing hydrogen fluoride by recovering fluorite with rare earth

Abstract

The invention relates to a method for preparing hydrogen fluoride by recovering fluorite with rare earth, which relates to the technical field of hydrogen fluoride production; the raw materials for mixed reaction subsequently enter a rotary reaction furnace to ensure that the raw materials are fully reacted at the optimal reaction temperature, separated impurities enter a slag cooling cylinder, and the rest part enters a washing tower; wherein the washing tower comprises a washing acid circulating tank and a washing acid cooler; then the washing acid with necessary content and proportion is provided, wherein the raw materials enter a first coarse distillation tower and a second coarse distillation tower simultaneously after making full contact with the washing acid in the washing tower, and the raw materials passing through the first coarse distillation tower are discharged to a first-stage condenser and discharged to a second-stage condenser. According to the method, raw materials in a first-stage condenser can be circularly discharged into a second coarse distillation tower, and then raw material powder sequentially passes through a second-stage condenser and a third-stage condenser and is finally subjected to a final impurity precipitation reaction in a fine distillation tower. Crude acid containing most heavy components in primary cooling is returned to the washing tower, while a small amount of other heavy components enter a second condenser and a third condenser along with the reaction gas to be condensed, so that the quality of the crude acid is greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen fluoride production, in particular to a method for preparing hydrogen fluoride by recovering fluorite from rare earths. Background technique [0002] Fluorite, also known as fluorite, is mainly composed of calcium fluoride (CaF2). Fluorite is the only mineral that can extract a large amount of fluorine. The fluorine in fluorite ore is difficult to extract directly, so it is mined from the mine. Fluorite ore needs to be processed into powder and refined into high-purity acid-grade fluorite powder, and then react with industrial sulfuric acid to produce anhydrous hydrogen fluoride (AHF) with high chemical activity, which is then supplied to the downstream fluorine chemical industry. Fluorite It is the main source of fluorine element in modern fluorine chemical industry, and it is an important mineral raw material for modern industry, and it is quite irreplaceable. [0003] Comprehensive experiment...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing hydrogen fluoride by recovering fluorite from rare earths, which can effectively solve the problems of poor quality of crude acid produced by traditional equipment in the background technology and poor precipitation purity due to lack of cyclic reaction steps.

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