Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker

A technology of calcium sulfate whiskers and mixed additives, which is applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of unrealized water circulation, cumbersome process, increased cost, etc., and achieve energy saving, The process is simple and the effect of reducing environmental pressure

Active Publication Date: 2015-09-23
四川康升晶须科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are also obvious: the process is cumbersome and water circulation is not realized, and the use of inorganic solvents during high-temperature calcination not only easily agglomerates the whiskers but also increases the cost

Method used

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  • Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker
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  • Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Calcium sulfate dihydrate (content 97wt%) was ground through an 80-mesh sieve, and 96 kilograms of calcium sulfate dihydrate were weighed and mixed in 480 kilograms of water, and mixed additives (shape control agent: dodecylbenzenesulfonate) were added while stirring at normal temperature. Sodium acid sodium 50g; Auxiliary control agent: magnesium sulfate 500g; Reaction system pH regulating agent: 1.2 liters of 98% industrial grade sulfuric acid), after continuing to stir for 10 minutes, the slurry injection volume is in the hydrothermal reactor of 680L, at 115 ℃ , hydrothermal reaction at a stirring speed of 50 rpm for 30 minutes. After the reaction stopped, the material was unloaded and centrifuged. The sample was dried under the action of hot air at 150°C. Finally, the sample was calcined at 650°C for 1 hour to obtain an average length of 300 μm and an average diameter of Anhydrous dead-burned calcium sulfate whiskers with an aspect ratio of about 1 μm, an aspect rati...

Embodiment 2

[0058] Calcium sulfate dihydrate (content 97wt%) was ground through an 80-mesh sieve, and 48 kilograms of calcium sulfate dihydrate were weighed and mixed in 480 kilograms of water, and mixed additives were added while stirring at normal temperature (morphological control agent: 35 g of polyvinylpyrrolidone; auxiliary Controlling agent: magnesium chloride 650g; Reaction system pH regulating agent: 98% technical grade sulfuric acid 1.2 liters), after continuing to stir for 10 minutes, the slurry injection volume is in the hydrothermal reactor of 680L, and at 125 ℃, stirring speed is 50 rpm Under the condition of 10 minutes, the hydrothermal reaction was carried out for 40 minutes. After the reaction stopped, the material was unloaded and centrifuged, and the sample was dried under the action of hot air at 150°C. Finally, the sample was calcined at 700°C for 1 hour to obtain an average length of 400 μm, an average diameter of about 2 μm, and an aspect ratio of 200, anhydrous dead...

Embodiment 3

[0062] Calcium sulfate dihydrate (content 97wt%) was ground through a 120 mesh sieve, 48 kg of calcium sulfate dihydrate was weighed and mixed in 480 kg of water, and mixed additives were added while stirring at normal temperature (morphology control agent: 45g, Tween and poly Vinylpyrrolidone mass ratio 1:1; auxiliary control agent: 640g, magnesium chloride and sodium chloride mass ratio 20:1; reaction system pH regulator: 2000g, citric acid and formic acid mass ratio 1:1), after continuing to stir for 10 minutes, Pour the slurry into a hydrothermal reaction kettle with a volume of 680L, and conduct a hydrothermal reaction at 130°C with a stirring speed of 100 rpm for 40 minutes. After the reaction stops, unload and centrifuge, and dry the sample under the action of hot air at 150°C , the final sample was calcined at 700°C for 1 hour to obtain anhydrous dead-burned calcium sulfate whiskers with an average length of 200 μm, an average diameter of about 1.5 μm, an aspect ratio o...

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Abstract

The invention relates to a mixed additive for producing an anhydrous dead-burned type of calcium sulfate whisker, and belongs to the technical field of inorganic chemical materials production. The mixed additive of the invention comprises a morphology controlling agent, an auxiliary controlling agent and a reaction system pH controlling agent. The mass ratio of the morphology controlling agent, the auxiliary controlling agent and the reaction system pH modulator is 1:0-20:30-70. The mixed additive can speed up growth of crystals, shorten reaction time, and at the same time can implement control of whisker morphology to acquire high aspect ratio hemihydrate calcium sulfate whisker. The invention further relates to a method for producing an anhydrous dead-burned type of calcium sulfate whisker. The method comprises: using calcium sulfate dihydrate, water and the mixed additive as raw materials, performing a hydrothermal reaction to acquire hemihydrate calcium sulfate whisker; after filtration, drying,calcination and cooling, acquiring the anhydrous dead-burned type of calcium sulfate whisker with calcium sulfate content being more than 98wt%. The invention is simple in process, zero in pollution, low in production cost, high in operability, good in product quality and good in stability.

Description

technical field [0001] The invention belongs to the technical field of production of inorganic chemical materials, and relates to a production method of calcium sulfate whiskers, in particular to a mixed additive and a method for producing anhydrous dead-burned calcium sulfate whiskers. Background technique [0002] There are many raw materials that can be used as raw materials for the production of calcium sulfate whiskers in my country. In addition to high-purity limestone and natural gypsum, a large number of secondary calcium sources such as: industrial by-products calcium chloride, desulfurized gypsum, decolorized phosphogypsum, etc. need to be effectively utilized. Effective utilization of these secondary calcium sources can reduce the pressure of environmental pollution and resource depletion. [0003] Calcium sulfate whiskers refer to calcium sulfate single crystal fibers with fixed cross-sectional shape, complete shape, perfect internal structure, and aspect ratio gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/10
Inventor 桂明生王鹏飞
Owner 四川康升晶须科技有限公司
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