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Method for manufacturing regenerative gypsum powder by waste gypsum models

A waste gypsum and gypsum powder technology, applied in the field of gypsum materials, can solve problems such as lack of investment, low operability, and large-scale production conditions, and achieve the effects of promoting technological progress, high operability, and reducing enterprise costs

Active Publication Date: 2010-09-29
HUIDA SANITARY WARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formula for neutralization treatment is: "put 100% of waste gypsum in water 2-5 times its weight, add concentrated sulfuric acid or concentrated hydrochloric acid or concentrated phosphoric acid 2.5%, bleaching powder 1.5%, stir and purify for 4 hours, and its activation treatment formula It is: put the neutralized raw material in the reaction tank, catalyze it with a vanadium mesh, add 1-2% concentrated phosphoric acid, and activate it for 6 hours at 30-80°C under a pressure of 0.1-0.2MP" and so on, as can be seen above The method has not been widely used because the process is too complicated, the operability is not high, and the practicability is not strong.
[0004] So far, there is no production method of recycled gypsum powder that is suitable for large-scale production and completely replaces plaster powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the collected waste gypsum model is checked and selected, and the waste model with a lot of alkali hair is removed; the waste gypsum model is crushed into fragments below 70mm, and the sieve is passed through a 2-mesh sieve, and the sieve is standby; the waste gypsum model fragments are placed in the Soak in 0.1% ethylenediaminetetraacetic acid disodium salt solution for 0.5 hours. During soaking, the ethylenediaminetetraacetic acid tetrasodium salt solution must fully immerse the waste gypsum model; put the soaked waste gypsum model fragments into autoclaved Autoclaved autoclave, pressure: 0.6Mpa, temperature: 160°C, time: 3 hours; take out the waste gypsum model fragments after autoclaving and put them in a drying box for drying. Drying time: 12 hours. Drying temperature: 100°C; cool and crush the dried waste gypsum model, pass through a 100-mesh sieve to form gypsum powder; age the above gypsum powder in a sealed state for 5 days, and then use it.

Embodiment 2

[0031]Embodiment 2: the collected waste gypsum model is checked and selected, and the waste model with a lot of alkali hairs is removed; the waste gypsum model is crushed into fragments below 70mm, passed through a 2-mesh sieve, and the sieve is for subsequent use; the waste gypsum model fragments are placed in the Soak in 0.5% ethylenediaminetetraacetic acid tetrasodium salt solution for 0.2 hours. During soaking, the ethylenediaminetetraacetic acid tetrasodium salt solution must fully immerse the waste gypsum model; put the soaked waste gypsum model fragments into autoclaved Autoclaved autoclave, pressure: 0.15Mpa, temperature: 110°C, time: 9 hours; take out the waste gypsum model fragments after autoclaving and put them in a drying box for drying. Drying time: 1 hour. Drying temperature: 180°C; cool and crush the dried waste gypsum model, and pass through a 100-mesh sieve to form gypsum powder; age the above gypsum powder in a sealed state for 7 days before it can be used. ...

Embodiment 3

[0032] Embodiment 3: check the collected waste gypsum model, remove the waste model with a lot of alkali hair; the waste gypsum model is crushed into fragments below 70mm, pass through a 2 mesh sieve, and the sieve is standby; the waste gypsum model fragments are placed in the Soak in 0.2% ethylenediaminetetraacetic acid disodium salt solution for 0.3 hours. During soaking, the ethylenediaminetetraacetic acid disodium salt solution must fully immerse the waste gypsum model; put the soaked waste gypsum model fragments into autoclaved Autoclaved autoclave, pressure: 0.4Mpa, temperature: 130°C, time: 5 hours; take out the waste gypsum model fragments after autoclaving and put them in a drying box for drying. Drying time: 8 hours. Drying temperature: 150°C; cool the dried waste gypsum model and crush it into pieces, and pass through a 100-mesh sieve to form gypsum powder; age the above gypsum powder in a sealed state for 6 days before it can be used.

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Abstract

The invention relates to a method for manufacturing regenerative gypsum powder by waste gypsum models, which belongs to the technical field of gypsum materials. The invention is used for solving the problem of regenerative utilization of the waste gypsum models, and is characterized in that the method is carried out according to the following steps: a. picking selection; b. crushing; c. soaking; d. steam pressing by a still kettle; e. baking; f. crushing and screening; and g. ageing. The invention has the main advantages that: 1. the method is simple, the operability is high, the invention is suitable for large production condition operation, does not need special equipment, and is easy to be popularized and applied; 2. the waste gypsum models treated according to the method of the invention can be in cyclic use for many times; 3. the performance of the regenerative gypsum powder produced by the method of the invention is similar to the performance of the new gypsum powder in use, and some indexes are superior to those of the new gypsum powder; and 4. the regenerative gypsum powder of the invention can be used for manufacturing large slip casting gypsum models without the addition of additives. The method of the invention has great positive effect in the aspects such as resource protection, pollution reduction, technical progress promotion, enterprise cost reduction and the like through the cyclic utilization.

Description

technical field [0001] The invention relates to a method for making gypsum powder, in particular to a method for making regenerated gypsum powder by using a waste gypsum model, and belongs to the technical field of gypsum materials. Background technique [0002] Ceramic products are important supplies in people's lives, but a lot of waste is generated in the process of producing ceramics. According to statistics, the waste plaster models used to make ceramic products in China are as high as several million tons every year. The amount of gypsum powder used to produce ceramic products has doubled in the past five years. At present, the utilization of waste gypsum models is mainly used by cement enterprises as part of the raw materials, but the amount of use is limited. [0003] Hemihydrate gypsum and dihydrate gypsum can be transformed into each other under certain conditions, so the reuse of waste gypsum models has long been a subject of exploration, and people in the indust...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/262
Inventor 王彦庆曹和平吴萍宋子春樊立永杨晖王春金侯建勇王海超李晶田磊
Owner HUIDA SANITARY WARE
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