Technology for preparing sodium fluorosilicate through fluoride-containing wastewater

Abstract

The invention discloses a technology for preparing sodium fluorosilicate through fluoride-containing wastewater. The technology comprises the following steps that 1, silicon slag is added in the fluoride-containing wastewater at 10 DEG C-35 DEG C, the stirring speed is set at 350-450 r / min, the reaction time is set at 15-35 min, and then filtering is performed to obtain a fluosilicic acid solution; 2, a sodium chloride solution is added in the fluosilicic acid solution, the reaction temperature is controlled at 10 DEG C-35 DEG C, the reaction time is controlled to be 20 min 40 min, filtering is performed, and the sodium fluorosilicate product is obtained when a filter cake is dried. According to the technology for preparing the sodium fluorosilicate through the fluoride-containing wastewater, after the industrial fluoride-containing wastewater is treated, the fluorine content in the wastewater is reduced to 0.1 g / L-0.5 g / L, the content of aluminum and boron is not basically changed, the treated wastewater can be recycled through deep fluoride removal, therefore, recycling of fluorine and silicon resources can be achieved, the production cost is lowered, and the better economic benefit and environmental protection benefit are achieved.

Description

technical field [0001] The invention relates to the technical field of photoelectric glass deep processing, in particular to a process for preparing sodium fluorosilicate by utilizing fluorine-containing waste water. Background technique [0002] With the development of my country's economy and the rise of the construction climax, the glass industry has developed rapidly. With the expansion of original film enterprises and the rapid growth of people's market demand for functional glass, the glass deep processing industry has also developed rapidly. In these glass deep-processing enterprises, a large amount of industrial fluorine-containing wastewater will be produced. Enterprises are facing severe environmental protection pressure. How to deal with industrial fluorine-containing wastewater and realize the comprehensive utilization of resources is an urgent problem to be solved. [0003] At present, the main treatment method for the fluorine-containing wastewater in the glass...

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Problems solved by technology

The production of sodium fluorosilicate, in which the source of fluorosilicate mainly comes from fluorite and phosphate rock, with the proven fluorite resources and the continuous consumption of phosphate rock in phosphate and compound fertilizer enterprises, resources are limited, and fluorine resources belong to High-energy-consuming chemical products have high production costs, are expensive, and are not conducive to environmental protection. Therefore, more and more attention has been paid to rational and effective use of fluorine resources in wastewater

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