Process for preparing fast-soluble boron by using boric acid mother liquor

Abstract

The invention relates to a process for preparing fast-soluble boron by using boric acid mother liquor. The process is characterized in that the boric acid mother liquor contains 40-45 g / t of boric acid and 280-300 g / t of magnesium sulfate; after the boric acid mother liquor is evaporated and concentrated through a multi-effect evaporator, the boric acid reaches 140 g / t, the magnesium sulfate reaches 380-400 g / t, and the boric acid mother liquor is pumped into a crystallizer and water-cooled to 20-22 DEG C; the boric acid mother liquor is placed in a flotation machine, the boric acid and the magnesium sulfate are separated, then boric acid foam is heated to 90 DEG C and pumped into a boric acid crystallizer, centrifugal separation is conducted after cooling, the boric acid is sent to a drying machine to be dried, and a finished product is obtained. The process is characterized by comprising the following steps that borax is prepared from the boric acid mother liquor, wherein the borax mother liquor contains 90-110 g / t of borax; the boric acid mother liquor is pumped into the multi-effect evaporator and then pumped into the crystallizer when the borax content in the mother liquor reaches 180-200 g / t, water cooling is conducted until the temperature is 22-25 DEG C, the boric acid mother liquor is placed in the flotation machine for separating borax crystals to obtain borax decahydrate crystals, and the borax decahydrate crystals are sent to the drying machine for drying to obtain borax pentahydrate.

Description

technical field [0001] The invention relates to a process for preparing instant boron by using boric acid mother liquor. Background technique [0002] Boric acid is an important inorganic chemical basic raw material, which occupies an important position in the development of national economy and industrial and agricultural production. The processing of boron ore resources adopts different processing methods according to the different raw materials. At present, boron-magnesium ore is widely mined and utilized in our country. The processing method of boron magnesium ore mainly adopts the sulfuric acid method, and the yield of this method is only 70%~72%. For every t of boric acid produced, 4~6t of mother liquor is discharged. The concentration of boric acid in the mother liquor is about 3%, and the concentration of magnesium sulfate is about 20%. A large amount of discharged mother liquor not only wastes resources, but also pollutes the environment. For decades, increasing ...

AI Technical Summary

Problems solved by technology

There are following problems in this technique: 1, concentrate and adopt solar energy to directly evaporate, and production efficiency is low, is not suitable for large-scale production;

(3) Basic magnesium carbonate is prepared by ammonium bicarbonate circulation method, and further calcined to produce high-purity magnesium oxide. This method has high purity but high cost

(5) High-purity micro-powder magnesium oxide is produced by reacting high-purity metal magnesium with oxygen. This method requires high equipment, high cost, and is not suitable for industrial mass production

[0005] In the process of salt lake development, the main focus is on the utilization of a single potassium chloride resource. The concentrated discharge of magnesium-containing old brine during the development process has caused the local enrichment of magnesium chloride, which has become a "stop" in the process of development and utilization of salt lake resources to a certain extent. Magnesium damage” hinders the further development and utilization of salt lake resources

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