Method for preparing calcium sulfate whiskers

A technology for calcium sulfate whiskers and whiskers, which is applied in the field of preparation of calcium sulfate whiskers, can solve the problems of not being suitable for industrialized production, low output, and high energy efficiency, and achieve the effects of reducing calcination procedures, simple mining, and reducing emissions

Inactive Publication Date: 2015-09-30
张灵芝
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Benefits of technology

By utilizing this method for producing highly pure or white hydrocystine-based particles called talc powder that are suitable for various applications such as paper making (calcium hydroxypropyltrimethylammonium bromidimole), coating compositions containing these particles, rubbers made from them, polymers like polyurethanes, ceramics, paints, adhesives, lubricants, waxes, solvents, waterproof agents, fibers, fabrics, and other products. These methods help save valuable landfill space while improving environmental quality through efficient usage of mineral sources.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the properties of calcilite powder used in applications like building reinforcement composites. Current processes involve creation of these finely dispersible particles from naturally occurring calcite through wetting techniques involving solvent evaporation or precipitation reactions. These conventional methods result in poor yield and impurity content issues.

Method used

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  • Method for preparing calcium sulfate whiskers
  • Method for preparing calcium sulfate whiskers

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Embodiment Construction

[0034] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0035] (1) Raw material: use limestone containing 90% to 98% calcium carbonate as raw material, grind the limestone into 46-100 mesh powder, send it to the leaching workshop for leaching, and leaching in the next process.

[0036] (2) Leaching: mix ground limestone with hydrochloric acid (concentration 15% to 30%) and recycled dilute hydrochloric acid to obtain a calcium chloride solution.

[0037](3) Slurry adjustment: adjust the calcium chloride solution to 1.5-3mol / L, use magnesium chloride as the transcrystal enzyme, and the content of magnesium chloride is 0.1-0.5mol / L.

[0038] (4) Crystallization at room temperature: add dilute sulfuric acid to the adjusted calcium chloride solution at room temperature, and crystallize under constant stirring. Filter and wash after whisker growth is complete. After filtering, return the acid-containing sol...

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Abstract

The invention discloses a method for preparing calcium sulfate whiskers. The method comprises the following procedures: with limestone as the raw material, grinding, leaching, size mixing, heating, crystallizing, nature determining by the hydrothermal method, steam-pressing, drying and the like. The produced calcium sulfate whiskers have the whitenness, the purity and the content of larger than or equal to 98% and the length-diameter ratio of 50-200. 200-350 kg of anhydrous calcium sulfate whiskers can be produced by each cubic meter of a dihydrate gypsum suspension. The produced whiskers are silky luster and can be used in the aspects of papermaking, coatings, rubber, plastics and the like. As limestone is adopted as the raw material to produce the anhydrous calcium sulfate whiskers, not only is the problem of natural gypsum exhaustion solved, but also optimal resource utilization is realized.

Description

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Claims

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Application Information

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Owner 张灵芝
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