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Method for preparing calcium sulfate whiskers from bone gelatin wastewater

A technology of calcium sulfate whisker and bone gelatin is applied in the field of three-waste treatment of bone gelatin production workshop, which can solve the problems of products staying in the experimental verification stage, unable to realize industrial production, polluting the surrounding environment, etc., and achieves simple and controllable growth process conditions, The effect of improving the treatment level and reducing the discharge of three wastes

Active Publication Date: 2020-05-08
ZHEJIANG HUANYAO ENVIRONMENTAL CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials for the preparation of gypsum whiskers are becoming more and more abundant, but most of the prepared products only stay in the stage of experimental verification and cannot realize industrial production
[0005] At present, the application of bone gelatin has been widely used in photography, medicine, food, pesticides, cosmetics, polymer materials and other fields. The wastewater containing high calcium and organic matter discharged from the workshop has seriously polluted the surrounding environment, especially causing great trouble to wastewater treatment
This is due to the large amount of Ca contained in the discharged wastewater 2+ , can easily cause sludge calcification and pipeline blockage, which will have a great impact on the biochemical treatment of wastewater from gelatin factories

Method used

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  • Method for preparing calcium sulfate whiskers from bone gelatin wastewater
  • Method for preparing calcium sulfate whiskers from bone gelatin wastewater
  • Method for preparing calcium sulfate whiskers from bone gelatin wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of method utilizing bone gelatin waste water to prepare calcium sulfate whisker, comprises the following steps:

[0041] 1) Take the wastewater from the bone gelatin pickling workshop, filter it with a 200-mesh PE filter cloth, and dilute the filtrate with water until the molar concentration of calcium ions is 0.25mol / L;

[0042] 2) Place the diluted filtrate on a magnetic heating furnace and heat it to 40° C. and keep it warm, and add ammonium chloride to the above filtrate while stirring until the concentration of ammonium chloride is 13%;

[0043] 3) Slowly add 40wt% sulfuric acid so that the molar ratio of calcium ions to sulfate ions is 1:2, heat to 95°C and keep warm for 18min;

[0044] 4) After cooling down to 80°C, heat-preserve and age for 2.5 hours, pour off the supernatant, separate out the solid matter, wash the solid matter with tap water for 2-3 times, and collect the washing liquid;

[0045] 5) The solid matter was centrifuged in a bag type centri...

Embodiment 2

[0049] A kind of method utilizing bone gelatin waste water to prepare calcium sulfate whisker, comprises the following steps:

[0050] 1) Take the wastewater from the bone gelatin pickling workshop, filter it with a 200-mesh PPS filter cloth, and dilute the filtrate with water until the molar concentration of calcium ions is 0.2mol / L;

[0051] 2) Place the diluted filtrate on a magnetic heating furnace and heat it to 35° C. and keep it warm, and add ammonium chloride to the above filtrate while stirring until the concentration of ammonium chloride is 10%;

[0052] 3) Slowly add 40wt% sulfuric acid so that the molar ratio of calcium ions to sulfate ions is 2:5, heat to 90°C and keep warm for 15min;

[0053] 4) After cooling down to 75°C, heat preservation and aging for 2 hours, pour off the supernatant, separate the solid matter, wash the solid matter with tap water 2-3 times, and collect the washing liquid;

[0054] 5) The solid matter was centrifuged in a bag type centrifuge...

Embodiment 3

[0058] A kind of method utilizing bone gelatin waste water to prepare calcium sulfate whisker, comprises the following steps:

[0059] 1) Take the wastewater from the bone gelatin pickling workshop, filter it with a 200-mesh PPS filter cloth, and dilute the filtrate with water until the molar concentration of calcium ions is 0.3mol / L;

[0060] 2) Place the diluted filtrate on a magnetic heating furnace and heat it to 55°C and keep it warm, and add ammonium chloride to the above filtrate while stirring until the concentration of ammonium chloride is 15%;

[0061] 3) Slowly add 40wt% sulfuric acid so that the molar ratio of calcium ions to sulfate ions is 3:5, heat to 90°C and keep warm for 20min;

[0062] 4) After cooling down to 75°C, heat preservation and aging for 2 hours, pour off the supernatant, separate the solid matter, wash the solid matter with tap water 2-3 times, and collect the washing liquid;

[0063] 5) The solid matter is centrifuged in a bag type centrifuge, a...

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Abstract

The invention discloses a method for preparing calcium sulfate whiskers from bone gelatin wastewater. According to the method, waste water of a bone gelatin production line, namely waste water of a pickling workshop, is utilized as a raw material, wherein the calcium sulfate dihydrate whiskers grow in the aging process through the means of dilution, ammonium chloride addition for dissolution promotion, excessive sulfuric acid addition for acidification and the like, the recovery rate of calcium in the waste water of the pickling workshop can reach 80% or above, and the obtained whiskers are high in purity and whiteness and uniform in form. The method can effectively treat the problem of overhigh calcium content in the wastewater of the bone gelatin pickling workshop, reduce the discharge amount of three wastes and improve the output value of a bone gelatin production line.

Description

technical field [0001] The invention relates to the technical field of three-waste treatment in a bone gelatin production workshop, in particular to a method for preparing calcium sulfate whiskers by using bone gelatin wastewater. Background technique [0002] Gypsum whisker is an inorganic single crystal material with calcium sulfate (containing 0-2 crystal water) as the main component, with a diameter of micronano scale and a long diameter of tens to hundreds. It has good mechanical properties and organic compatibility, and is cheap and non-toxic. It has a wide range of uses in the fields of composite materials, environmental materials, papermaking, catalysis, and biodegradable materials. It is extremely small and is a fibrous material with great application value. [0003] Gypsum whisker fibers are widely used in various fields. In the construction industry, it is used as an insulating and flame-retardant material to replace toxic asbestos to prepare building materials;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/14
CPCC30B29/46C30B29/62C30B7/14
Inventor 王杰吴斌沈滨宋旭刘泽川朱锦涛余保财
Owner ZHEJIANG HUANYAO ENVIRONMENTAL CONSTR
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