Method for preparing nano strontium carbonate

Abstract

The invention discloses a method for preparing nano strontium carbonate and belongs to the technical field of strontium carbonate preparation. Celestite serves as the raw material and is smashed and then dissolved with an excessive amount of diluted sulphuric acid to move calcium carbonate therein, then strontium sulfate in the celestite is dissolved with diluted hydrochloric acid, filtering is conducted to remove insoluble substances like barium sulfate, then the obtained strontium chloride solution is mixed with automatically cultured microorganism colonies on the surface of the celestite, and organic matter, with negative charges, on the surface of microorganism cell surfaces is chelated with strontium ions in the solution; urea serves as the carbon source of microorganisms, the urea is continuously decomposed so that the concentration of carbanions in the solution around the microorganisms can be increased continuously, accordingly the concentration of part of carbanions and strontium ions in the solution is increased, the carbanions and the strontium ions are combined into strontium carbonate crystal precipitate, and then the precipitate is filtered and dried to obtain the nano strontium carbonate. The method has the advantages that preparation steps are simple, the impurity content of the obtained product is reduced by 70-80%, and activity is improved by 25-30%.

Description

technical field [0001] The invention relates to a preparation method of nano strontium carbonate, which belongs to the technical field of strontium carbonate preparation. Background technique [0002] Strontium carbonate, white powder or granules, odorless and tasteless. Mainly used in glass shell glass, magnetic materials, metal smelting, strontium salt preparation, electronic components, fireworks. It is used in the manufacture of color TV cathode ray tubes, electromagnets, strontium ferrite, pyrotechnics, fluorescent glass, signal flares, etc. It is also a raw material for the production of other strontium salts, and is used as a special PTC thermistor element (switch start, degaussing, current limiting protection, The basic powder produced by constant temperature heating, etc.) is the basic raw material for the production of strontium salt. As a carrier of palladium, it can be used for hydrogenation. In addition, it is also used in the production of pyrotechnics, fluo...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: aiming at the disadvantages of high impurity content, poor activity, large particle size and high production cost of strontium carbonate obtained by the current method, a kind of celestite is provided as raw material, after pulverization, with excessive Dissolve dilute sulfuric acid to remove the calcium carbonate component, then dissolve strontium sulfate with dilute hydrochloric acid, filter to remove insoluble matter such as barium sulfate, and then mix the obtained strontium chloride solution with self-cultivated celestite surface microbial colonies Mixing, using negatively charged organic substances on the surface of microbial cells and Sr in solution 2+ At the same time, microorganisms use urea as a carbon source to continuously decompose urea, so that the concentration of carbonate ions in the solution around the microorganisms continues to increase, resulting in local carbonate ions and Sr in the solution 2+ When the concentration increases, the two combine to form strontium carbonate crystals and precipitate out, and then filter and dry to obtain nanometer strontium carbonate