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Process method for producing building gypsum powder by utilizing citric acid gypsum

A technology of citric acid gypsum and building gypsum powder, which is applied in the comprehensive treatment and reuse of solid waste, and the field of producing building gypsum by using citric acid gypsum, which can solve the problems of short residence time, reduce moisture, and uneven heating of materials, so as to reduce the failure rate and maintenance costs, reduce production and operation costs, and strive for compact process layout

Active Publication Date: 2013-05-08
RIZHAO JINHE BOYUAN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat conduction oil is used as the heating medium, and part of the dry material is returned to reduce the moisture content of the material. The material is heated unevenly, and the water vapor is large, which is not easy to discharge in time, which affects the calcination and dust removal system; 5. Drum dryer
This type of dryer is relatively bulky, suitable for drying materials with high-temperature flue gas as the medium, and the materials are polluted
[0006] There are two main methods of calcination, namely fast calcination and slow calcination. The representative of fast calcination is Sider calciner. The material stays in it for a short time, the calcination effect is not good, there is more over-burning, and the semi-water content is low. Unstable performance

Method used

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  • Process method for producing building gypsum powder by utilizing citric acid gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Transport the citric acid gypsum that has been stacked and homogenized for one month to the feed hopper, and send it to the airflow dryer through the feeder;

[0036] 2. The cold air enters the dryer from the bottom of the dryer after heat exchange by the high-temperature exhaust gas of the power plant into high-temperature hot air, and the drying temperature is 400°C;

[0037] 3. Citric acid gypsum performs mass transfer and heat exchange with hot air in the dryer. At the same time, the dispersing device at the bottom of the dryer continuously disperses the material to enhance the heat transfer effect. After drying, the attached water content of the material is 2.46%. ;

[0038] 4. The dried material is separated from the material by the secondary cyclone dedusting, and the separated material enters the fluidized calciner;

[0039] 5. The material enters the calcination furnace through the hoist for continuous calcination, the calcination temperature is 180°C, and ...

Embodiment 2

[0045] 1. Transport the citrate gypsum that has been stacked and homogenized for 2 months to the feed hopper, and send it to the airflow dryer through the feeder;

[0046] 2. The cold air enters the dryer from the bottom of the dryer after heat exchange by the high-temperature exhaust gas of the power plant into high-temperature hot air, and the drying temperature is 420°C;

[0047] 3. Citric acid gypsum performs mass transfer and heat exchange with hot air in the dryer. At the same time, the dispersing device at the bottom of the dryer continuously disperses the material to enhance the heat transfer effect. After drying, the attached water content of the material is 2.12%. ;

[0048] 4. The dried material is separated from the material by the secondary cyclone dedusting, and the separated material enters the fluidized calciner;

[0049] 5. The material enters the calcination furnace through the hoist for continuous calcination, the calcination temperature is 220°C, and the c...

Embodiment 3

[0055] 1. Transport the citric acid gypsum that has been stacked and homogenized for 3 months to the feed hopper, and send it to the airflow dryer through the feeder;

[0056] 2. The cold air enters the dryer from the bottom of the dryer after heat exchange by the high-temperature exhaust gas of the power plant into high-temperature hot air, and the drying temperature is 450°C;

[0057] 3. The citric acid gypsum performs mass transfer and heat exchange with the hot air in the dryer. At the same time, the dispersing device at the bottom of the dryer continuously disperses the material to enhance the heat transfer effect. After drying, the attached water content of the material is 1.64%. ;

[0058] 4. The dried material is separated from the material by the secondary cyclone dedusting, and the separated material enters the fluidized calciner;

[0059] 5. The material enters the calcination furnace through the hoist for continuous calcination, the calcination temperature is 200°...

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Abstract

The invention relates to a process method for producing building gypsum powder by utilizing citric acid gypsum. The process method comprises the following steps of: preparing raw materials, drying and scattering, dedusting, calcining, grinding and the like, wherein the raw materials are the citric acid gypsum which is stacked and homogenized naturally. In the process method, solid wastes in citric acid industry, namely the citric acid gypsum is recycled comprehensively to fulfill the aim of changing waste materials into valuables. Simultaneously, waste heat in generating workshops, namely superheated steam is used as a heat source to dry the citric acid gypsum, so the production cost is reduced, and the cleaning level of enterprises is improved.

Description

technical field [0001] The invention belongs to the comprehensive treatment and reuse of solid waste in the field of environmental protection, and in particular relates to a process for producing building gypsum by using citric acid gypsum. Background technique [0002] Citrate gypsum is a kind of industrial waste generated during acid hydrolysis with sulfuric acid during the production of citric acid. Its main component is calcium sulfate dihydrate, with a content of more than 95%. In addition, there are impurities such as silicon dioxide, aluminum oxide, and magnesium oxide, and about 40% of free water is attached. Citric acid gypsum contains a certain amount of residual acid and organic matter (mycelium), so that the strength of the produced hemihydrate gypsum is low, the setting time is longer, and it is difficult to use. It has not been effectively used for a long time and accumulated in large quantities, causing pollution to the environment. . At present, the common ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/02
Inventor 寇光智李昌涛于海彬周昊陈瑶
Owner RIZHAO JINHE BOYUAN BIOCHEM
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