Method for producing barium carbonate with barium hydroxide production wastewater

Abstract

The invention relates to the field of industrial wastewater recycling, in particular to a method for producing barium carbonate with barium hydroxide production wastewater. The method comprises the following steps of: pumping the wastewater generated during barium hydroxide production into a stirring kettle, adding 98% sodium bicarbonate during stirring, after wastewater clarification, stopping stirring, settling for 30min, injecting into a press filter for press filtration at the pressure of 8-10 atmospheres, after the press filtration, cleaning dregs of the press filter, and obtaining barium carbonate. The method has the benefits that: according to the method, an appropriate amount of sodium bicarbonate is added, and the adding velocity and settling time are controlled, so that the final purity of barium carbonate in a technology can reach above 90%, and the recovery rate of barium ions in the wastewater reaches above 95%.

Description

technical field [0001] The invention relates to the field of recovery and reuse of industrial waste water, in particular to a method for producing barium carbonate from barium hydroxide production waste water. Background technique [0002] Barium hydroxide is an important species in barium salt products. It is used as a catalyst for the synthesis of phenolic resin. The polycondensation reaction is easy to control. The obtained resin has low viscosity, fast curing speed and easy removal of the catalyst. It is also used as a catalyst for water-soluble urea-modified phenol-formaldehyde adhesives. The cured product is light yellow, and the divalent barium salt remaining in the resin does not affect the dielectric and chemical stability. [0003] It is used as an analytical reagent, and is also used for the separation of precipitated sulfate and the manufacture of barium salts, and the determination of carbon dioxide in the air. Quantification of chlorophyll, refining of sugar a...

AI Technical Summary

Problems solved by technology

[0006] The temperature required for this reaction is relatively high, but the process is short, and there are only two reactions. The accompanying defects are: high production cost, low raw material utilization rate, only about 70%, low resource utilization rate, crystallization Contains barium chloride, barium hydroxide, sodium hydroxide and other components, it is difficult to recycle, and direct waste will pollute water resources

[0008] The above-mentioned process has a high demand for ore and relies too much on ore resources. The original source is insufficient, and the utilization rate of raw materials is only about 50%, which means that the resource utilization rate is low. Similarly, the temperature required for this process is very high. At the same time, the waste water contains a large amount of barium ions that cannot be recovered, which wastes resources and pollutes water resources at the same time

[0009] The inability to effectively recycle and reuse the barium ions in the barium hydroxide production wastewater is a deficiency in the prior art