Method for preparing organic acid and calcium sulfate whisker from organic acid calcium salt by hydrochloric acid method

Abstract

The invention relates to the technical fields of organic acid separation and whisker synthesis, in particular to a method for preparing an organic acid and a calcium sulfate whisker from organic acidcalcium salt by a hydrochloric acid method. The method is characterized by comprising the following steps: (1) taking organic acid calcium salt and hydrochloric acid as raw materials, mixing the organic acid calcium salt with hydrochloric acid to undergo a metathesis reaction to obtain a mixed solution which mainly contains the organic acid, the organic acid calcium salt, calcium chloride and hydrochloric acid; (2) performing solvent extraction on the obtained mixed solution by utilizing an organic solvent to obtain a raffinate and a supported organic phase (I), washing the supported organic phase (I) to obtain a supported organic phase (II), performing RP-extraction on the organic phase (II) to obtain an organic acid washing solution and a blank organic phase; and (3) concentrating or crystallizing the organic acid washing solution obtained in the step (2) to obtain an organic acid product, and reacting the raffinate obtained in the step (2) with sulfuric acid or sulfate to prepare the calcium sulfate whisker. The method has the advantages of zero waste, low cost, high length-diameter ratio of the prepared calcium sulfate whisker and the like.

Description

Technical field [0001] The invention relates to the technical field of organic acid separation and whisker synthesis, in particular to a simple method, no pollution, no waste, low cost, and a calcium sulfate organic acid calcium salt with a high aspect ratio of calcium sulfate whiskers prepared by a hydrochloric acid method Method for preparing organic acid and calcium sulfate whiskers. Background technique [0002] As we all know, calcium sulfate whiskers are a new type of needle-shaped, uniform cross-section, complete shape, and complete internal structure of fiber sub-nano materials grown in the form of single crystals. Its morphology is caused by the difference in the growth rate of the crystal in the axial direction and the side surface. The whiskers mainly grow along the axial direction of the spiral dislocation. The side surface is a low-energy surface, which grows very slowly, and diffuses through the surface to the tip or base surface of the whisker. The upper outcroppi...

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Problems solved by technology

[0003] At present, calcium sulfate calcium whiskers are prepared from calcium sulfate fibrous single crystals synthesized from raw gypsum through a specific process and formula, or prepared in other forms. However, the calcium sulfate formed by the existing preparation methods is not a whisker. Waste slag has low utilization value, and a large amount of waste is generated during the preparation process, which pollutes the environment and increases production costs

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