Method for treating fluosilicate waste residues

Abstract

The invention discloses a method for treating fluosilicate waste residues. The method comprises the following steps: determining the total content of fluosilicate in the waste residues, so as to determine the usage amount of sodium hydroxide required to react with fluosilicate; mixing the waste residues and water according to the mass ratio of (1:30) to (1:40), heating up, then, adding a sodium hydroxide solution, stirring and reacting; removing manganese ions and permanganate ions from the solution obtained through reaction in the step (2); carrying out first-time filtration on the solution obtained in the step (3) so as to obtain a first filtrate and filtrated residue; concentrating and crystallizing the first filtrate, and then, carrying out second-time filtration so as to obtain sodium fluoride solid and a second filtrate; concentrating and crystallizing the second filtrate, then, carrying out third-time filtration so as to obtain a crude product potassium fluoride solid and a third filtrate, and recrystallizing the crude product potassium fluoride solid, so as to obtain a product potassium fluoride and a fourth filtrate. The method disclosed by the invention is aimed at treating and utilizing the fluosilicate waste residues generated from potassium permanganate and sodium fluosilicate which serve as raw materials.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of industrial waste residues, in particular to a treatment method for fluorosilicate waste residues. Background technique [0002] Guangdong Hangxin Technology Co., Ltd. has independently developed a new technology for the production of sodium permanganate, which has obtained a national invention patent (patent number 201010231951.1). This technology uses potassium permanganate and sodium fluorosilicate as raw materials to prepare sodium permanganate products by a one-step chlorination-free method. Low content. Compared with other technologies for producing sodium permanganate, it is efficient, safe, environmentally friendly and has excellent product quality. Although the method of producing sodium permanganate with potassium permanganate and sodium fluorosilicate as raw materials has many advantages mentioned above, it also has some problems: a large amount of waste residue wi...

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Problems solved by technology

Although the method of producing sodium permanganate with potassium permanganate and sodium fluorosilicate as raw materials has many advantages mentioned above, it also has some problems: a large amount of waste residue will be generated in the production, and the enterprise currently transports the waste residue to the pile The slag yard is sealed up to meet the requirements of environmental protection

[0003] Because the waste residue is a new type of waste residue, no one has been involved in its treatment and comprehensive utilization through literature research. In the process of trying to treat the waste residue, it was found that manganese ions are difficult to remove and are easily mixed in potassium fluoride and sodium fluoride. In addition, the problem of premature precipitation of sodium fluoride is likely to occur after sodium hydroxide is added to the aqueous solution of waste residue, and at the same time, it is difficult for the fluorosilicate radical to react completely, or it is easy to react with excess sodium hydroxide to form silicate floc gel, which hinders the reaction Further proceeding or reducing the degree of reaction progress will also cause problems such as difficulty in precipitation separation, product agglomeration, and high impurity content in crystals.

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