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Method for preparing calcium sulfate whiskers with oyster shells

A calcium sulfate whisker and oyster shell technology, applied in the field of calcium sulfate whisker preparation, can solve the problems of undesired crystal form, general product quality, high energy consumption and high cost, and achieve large aspect ratio and control effect Excellent, the effect of improving production capacity

Active Publication Date: 2015-11-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is the high-value utilization of calcium in oyster shells. For example, there are reports in the literature on the preparation of calcium citrate, calcium gluconate or calcium carbonate from oyster shells and scallop shells. Generally, it does not have the desired crystal form and can only be used in basic industrial applications. There is no report on the preparation of calcium sulfate whiskers from oyster shells.
However, due to the limitation of slurry concentration, the current hydrothermal method for preparing calcium sulfate whiskers has relatively low production efficiency and small production capacity, resulting in high energy consumption and cost.

Method used

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  • Method for preparing calcium sulfate whiskers with oyster shells
  • Method for preparing calcium sulfate whiskers with oyster shells
  • Method for preparing calcium sulfate whiskers with oyster shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The oyster shells are soaked in dilute hydrochloric acid, washed and dried, and the dried oyster shells are crushed into powder by a high-speed universal grinder for later use. The prepared oyster shell powder was reacted with industrial waste hydrochloric acid to prepare a calcium chloride solution with a concentration of 2.2 mol / L. At a temperature of 60°C, add a sodium sulfate solution with a concentration of 0.1 to 3.0 mol / L into the prepared calcium chloride solution while stirring, and continue to react for 60 minutes after the addition is complete to obtain a calcium sulfate material with a concentration of 20%. pulp. Put the slurry into a hydrothermal reaction kettle, and conduct hydrothermal treatment at a temperature of 150° C. for 5 hours. Filter the suspension after the hydrothermal reaction, and dry the obtained product at 100°C for 8 hours to obtain calcium sulfate hemihydrate whiskers with an average length of 120 μm and an average diameter of 0.5 μm. Th...

Embodiment 2

[0038] The oyster shells are soaked in dilute hydrochloric acid, washed and dried, and the dried oyster shells are crushed into powder by a high-speed universal grinder for later use. The prepared oyster shell powder was reacted with industrial waste hydrochloric acid to prepare a calcium chloride solution with a concentration of 2.4mol / L. At a temperature of 55°C, add a sodium sulfate solution with a concentration of 0.1 to 3.0 mol / L into the prepared calcium chloride solution while stirring, and continue the reaction for 55 minutes after the addition is complete to obtain a calcium sulfate material with a concentration of 22%. pulp. The slurry was put into a hydrothermal reactor, and hydrothermally treated at a temperature of 185° C. for 6 hours. Filter the suspension after the hydrothermal reaction, and dry the obtained product at 100°C for 7 hours to obtain calcium sulfate hemihydrate whiskers with an average length of 150 μm and an average diameter of 0.7 μm. The product...

Embodiment 3

[0040]The oyster shells are soaked in dilute hydrochloric acid, washed and dried, and the dried oyster shells are crushed into powder by a high-speed universal grinder for later use. The prepared oyster shell powder was reacted with industrial waste hydrochloric acid to prepare a calcium chloride solution with a concentration of 2.9 mol / L. At a temperature of 75°C, add a sodium sulfate solution with a concentration of 0.1 to 3.0 mol / L into the prepared calcium chloride solution while stirring, and continue the reaction for 80 minutes after the addition is complete to obtain a calcium sulfate material with a concentration of 26%. pulp. The slurry was put into a hydrothermal reaction kettle, and hydrothermally treated at a temperature of 145° C. for 4 hours. Filter the suspension after the hydrothermal reaction, and dry the obtained product at 100°C for 5 hours to obtain calcium sulfate hemihydrate whiskers with an average length of 180 μm and an average diameter of 1.6 μm. The...

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Abstract

The invention relates to a preparation method of calcium sulfate whiskers. The method is characterized by using oyster shells, industrial waste hydrochloric acid and sodium sulfate as raw materials, firstly grinding the oyster shells and then reacting the ground oyster shells with the industrial waste hydrochloric acid to prepare a calcium chloride solution, then adding sodium sulfate to obtain calcium sulfate slurry, and preparing the calcium sulfate whiskers after hydrothermal reaction. The method can achieve the effects of preparing the calcium sulfate whiskers with high added values and high yields, expanding the application range of the oyster shells and also improving the production capacity of the calcium sulfate whiskers.

Description

【Technical field】 [0001] The invention relates to a method for preparing calcium sulfate whiskers, in particular to a method for preparing calcium sulfate whiskers from oyster shells, and belongs to the field of preparing calcium sulfate whiskers. 【Background technique】 [0002] my country has a long coastline, and oysters and other shellfish resources are extremely rich, but the current development of oysters and other shellfish resources is mainly to process their edible parts, and a large number of seafood shells are discarded as garbage. During the long-term stacking of organic matter, the corruption and odor will cause serious pollution to the environment. How to make full and high-value utilization of oyster resources is not only a great opportunity for the oyster industry, but also a severe challenge for the oyster industry. [0003] Oyster shell is composed of cuticle, prismatic layer and nacre, the main part is prismatic layer, which has a large number of micropores...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B7/10
Inventor 高传慧郭方荣武玉民王传兴刘月涛许军
Owner QINGDAO UNIV OF SCI & TECH
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