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Method for transforming dry-method rotary kiln cement plant and consuming ardealite to make building gypsum powder

A construction gypsum powder and cement plant technology, applied in the field of construction gypsum powder manufacturing, can solve the problems of large negative impact on hydration performance and strength, and achieve the effects of high degree of automation, high production capacity of process equipment, and low investment

Active Publication Date: 2019-08-23
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For building gypsum powder, although a reasonable particle size range is conducive to improving strength, too many ultrafine particles have a greater negative impact on hydration performance and strength, and for building gypsum powder. Separation has not seen any research and practice reports so far

Method used

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  • Method for transforming dry-method rotary kiln cement plant and consuming ardealite to make building gypsum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, phosphogypsum that has been completely solidified and agglomerated in the open-air storage yard of a phosphorus chemical company is selected, and it is pre-broken to a granular material with a particle size of 40mm or less. The content of gypsum fluctuates between 83.7% and 92.5%. Using this phosphogypsum to make building gypsum powder includes the following steps:

[0033] (1) Continuously feed the water-containing block granular phosphogypsum into the vertical mill of the phosphogypsum dry powder system, the temperature of the hot air entering the mill is 170°C±10°C, and the feeding amount of phosphogypsum is adjusted at 140-180t / h to make the <1.5% dry powder;

[0034] (2) Convey the dry powder into the dry powder storage, and the dry powder in the dry powder storage is continuously metered and transported into the dehydration system through the bottom discharge of the storage. Etching or coking away organic impurities to make dehydrated gypsum powd...

Embodiment 2

[0040] In this example, fresh phosphogypsum bulk material from a chemical company is selected, which is gray in color. The detected moisture content fluctuates from 22.1 to 26.8%, and the (dry basis) dihydrate gypsum content fluctuates from 86.8 to 94.5%. Using this phosphogypsum to make building gypsum powder, including The following steps:

[0041] (1) The water-containing bulk phosphogypsum is continuously fed into the vertical mill of the phosphogypsum dry powder production system, the temperature of the hot air entering the mill is adjusted at 270°C±10°C, the feeding amount of phosphogypsum is adjusted at 130-170t / h, and the lime milk The added amount accounts for 1.8% of the mass ratio of water-containing phosphogypsum, and it is made into a dry powder with a moisture content of <2%;

[0042] (2) Convey the dry powder into the dry powder storage. The dry powder in the dry powder storage is continuously metered and transported to the dehydration system through the dischar...

Embodiment 3

[0048] In this example, the washed phosphogypsum bulk material from a storage yard of a phosphogypsum washing factory is selected. Construction gypsum powder, comprising the following steps:

[0049] (1) The water-containing bulk phosphogypsum is continuously fed into the vertical mill of the phosphogypsum dry powder production system, the temperature of the hot air entering the mill is 250°C±10°C, the feeding amount of phosphogypsum is adjusted at 115-130t / h, and the water content is 1.0% dry powder;

[0050] (2) The dry powder is transported into the dry powder warehouse. The dry powder in the dry powder warehouse is continuously metered and transported into the dehydration system through the bottom discharge of the warehouse. The dry powder feed rate is adjusted at 110-130t / h, and the temperature range is controlled at 380°C±10°C for rapid dehydration, and ablation or coking of organic impurities. Make dehydrated gypsum powder whose crystal water content fluctuates betwee...

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Abstract

The invention discloses a method for transforming a dry-method rotary kiln cement plant and consuming ardealite to make building gypsum powder. The method comprises the following steps: drying blockyor loosened ardealite by using a dry powder milling system, carrying out powder milling so as to obtain ardealite dry powder, further conveying the ardealite dry powder into a dry powder cabin, conveying the dry powder into a dehydration system from a continuous cabin bottom unloading metering system, removing crystallization water in the ardealite so as to obtain dehydrated ardealite powder, automatically discharging the dehydrated ardealite powder into a heat exchange type conveyer from a fifth cyclone bottom sliding tube of the dehydration system, cooling, aging in an aging cabin, conveyingthe aged dehydrated ardealite powder into a powder sorting machine of a sorting and decontamination system from the continuous cabin bottom unloading metering system, and continuously sorting a powder material by using the powder sorting machine, thereby obtaining a target product. Technological equipment of a dry-method rotary kiln cement production line is subjected to capacity transformation,the ardealite is adopted to make the building gypsum powder, and the method is environmental-friendly and energy-saving, high in capacity, low in investment and low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of building gypsum powder manufacturing, in particular to a method for producing building gypsum powder by transforming and absorbing phosphogypsum in a dry-process rotary kiln cement plant. Background technique [0002] Existing methods and equipment for producing building gypsum powder from various types of phosphogypsum, whether it is the traditional or innovative frying pan process, or the high-capacity fluidized furnace process or rotary drum roasting dehydration process or drying, crushing and dehydration using a dryer crusher technology, its equipment investment is relatively large and its production capacity is low. The limitations of existing technologies make its production scale mostly in the range of 100,000 t / a to 30 t / a. The consumption and processing capacity of 100,000 t / a to 30 t / a is obviously insufficient for the scale of phosphogypsum with a stockpile of more than hundreds of millions of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/036
CPCC04B11/036C04B11/26
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司
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