Production method for calcium metaborate by utilizing boron sludge waste liquid

The invention provides a production method for calcium metaborate by utilizing boron sludge waste liquid, and relates to the technical field of treatment and comprehensive utilization of three wastes in inorganic chemical industry. The method comprises the following steps: subjecting clarified boron sludge washing liquid and calcium hydroxide to a reaction in a corrosion-resistant reactor, wherein the mass ratio of boric acid in the boron sludge washing liquid to calcium hydroxide is 1: (0.97-1.41) in terms of pure substances, and carrying out a chemical reaction under slow stirring so as to generate a calcium metaborate precipitate; and carrying out filtering so as to obtain a calcium metaborate filter cake, carrying out washing with cold water, and carrying out spin-drying, drying and crushing, and weighting and packaging so as to obtain a calcium metaborate product. The invention has the following beneficial effects: the method effectively utilizes calcium hydroxide to separate boric acid from boron sludge