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Method for preparing alpha high-strength gypsum through atmospheric pressure salt solution method by using chlor-alkali by-product salt gypsum and chemical waste salt

A high-strength gypsum and by-product salt technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve the problems of no research and attempts, achieve good crystallinity, smooth surface, and reduce risks Effect

Inactive Publication Date: 2019-12-20
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is still in the stage of experimental research, and many problems about this method have not been resolved. The news of formal industrial production of α-high-strength gypsum using this method has not yet appeared. Therefore, it is possible to prepare α-high-strength gypsum by combining by-product salt gypsum and chemical waste salt. Turning waste into treasure is very creative, but there is no relevant research and attempt in the prior art

Method used

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  • Method for preparing alpha high-strength gypsum through atmospheric pressure salt solution method by using chlor-alkali by-product salt gypsum and chemical waste salt
  • Method for preparing alpha high-strength gypsum through atmospheric pressure salt solution method by using chlor-alkali by-product salt gypsum and chemical waste salt
  • Method for preparing alpha high-strength gypsum through atmospheric pressure salt solution method by using chlor-alkali by-product salt gypsum and chemical waste salt

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preparation example Construction

[0033] The invention provides a method for preparing α high-strength gypsum by using chlor-alkali by-product salt gypsum and chemical waste salt in the normal-pressure salt solution method (see flow chart figure 1 ), including the following steps: dry chemical waste salt at 80°C for 2h to remove free water and part of crystal water, then send it to a muffle furnace for high temperature cracking at 600°C for 3h, weigh 30g of waste salt and 70g of distilled water in a cone Mix the saline solution in a flask. Add 20 g of by-product salt gypsum and 0.06 g of anhydrous citric acid to the obtained salt solution and stir with a magnetic stirrer for 1 h (stirring speed is 500 r / min), then seal the mouth of the Erlenmeyer flask and put it in a 90°C constant temperature water bath React in a water bath for 3 hours (stirring while reacting, the stirring rate is 300r / min). After the water bath reaction is completed, the obtained suspension is centrifuged at a speed of 3000r / min to separa...

Embodiment 1

[0039] (1) Dry chemical waste salt at 70°C for 3 hours to remove free water and part of crystal water, then send it to a muffle furnace for high temperature cracking at 600°C for 5 hours, and use it as an atmospheric pressure salt solution method after passing the test of organic harmful substances (completely harmless) Prepare the salt solution raw materials of α high-strength gypsum for standby;

[0040] (2), weigh 30g chemical industry waste salt after the organic harmful substance detection is qualified, mix and prepare 30% saline solution with 70g distilled water in conical flask;

[0041](3), add 20g chlor-alkali by-product salt gypsum powder and 0.06g anhydrous citric acid in 30% saline solution, stir with magnetic stirrer, stirring speed is 500r / min, and stirring time is 3h;

[0042] (4), after the stirring is completed, seal the mouth of the Erlenmeyer flask and put it into a 95°C constant temperature water bath for 5 hours of water bath reaction, stirring while react...

Embodiment 2

[0045] (1) Dry chemical waste salt at 90°C for 1 hour to remove free water and part of crystallization water, then send it to a muffle furnace for 650°C high-temperature cracking for 3 hours, and use it as an atmospheric pressure salt solution method after passing the test of organic harmful substances (completely harmless) Prepare the salt solution raw materials of α high-strength gypsum for standby;

[0046] (2), weigh 35g chemical industry waste salt after the organic harmful substance detection is qualified, mix and prepare 35% saline solution with 65g distilled water in conical flask;

[0047] (3), add 25g chlor-alkali by-product salt gypsum powder and 0.03g anhydrous citric acid, 0.03g aluminum potassium sulfate in 35% saline solution, stir with magnetic stirrer, stirring speed is 400r / min, and stirring time is 4h;

[0048] (4), after the stirring is completed, seal the mouth of the Erlenmeyer flask and then put it into a 98°C constant temperature water bath for 3 hours ...

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Abstract

The invention discloses a method for preparing alpha high-strength gypsum through an atmospheric pressure salt solution method by using a chlor-alkali by-product salt gypsum and a chemical waste salt.First, the chemical waste salt is dried to remove free water and part of crystallization water, and then sent to a high-temperature incineration apparatus for incineration or high-temperature cracking to remove organic harmful substances, and then the incinerated or high-temperature cracked chemical waste salt is mixed with distilled water in a conical flask to prepare a salt solution; then the chlor-alkali by-product salt gypsum powder and a crystal conversion agent is added into the salt solution, and a water bath reaction is carried out after stirring; and after the water bath reaction iscompleted, solid-liquid separation is performed quickly by a centrifuge and washing is performed with boiling water for several times, then absolute ethanol is added for washing to stop the reaction,then drying is performed in an oven at 60-100 DEG C for 1-5 h, and a final powder, namely the alpha high-strength gypsum powder, is obtained. The product preparation process is simple in operation, low in cost, and suitable for industrial mass production, and has obvious economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of solid waste recovery and utilization, and relates to a method for producing gypsum from waste, in particular to a method for preparing α-high-strength gypsum by using chlor-alkali by-product salt gypsum and chemical waste salt in normal-pressure salt solution. Background technique [0002] A chlor-alkali company in Lianyungang City uses the nitrate-rich brine produced by the membrane denitrification system and the re-solation waste liquid produced by the ammonia-soda soda ash as raw materials to produce by-product salt gypsum (mainly calcium sulfate dihydrate) products (difficult to use, It is also a kind of industrial solid waste), its whiteness and purity can reach the grade of super-grade gypsum in natural gypsum, and it can be used as a high-quality raw material for the production of α-type high-strength gypsum. [0003] The chemical and pharmaceutical industries are industries with complex and large ...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/466C01F11/468C01P2002/72C01P2004/03C01P2004/10C01P2006/82
Inventor 常鹰谌援魏志顺段虹旭
Owner HUBEI UNIV OF TECH
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