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Method for making building gypsum powder by using dry-process rotary kiln cement plant to convert and absorb phosphogypsum

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

Active Publication Date: 2021-10-19
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 making building gypsum powder by using dry-process rotary kiln cement plant to convert and absorb phosphogypsum

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 method for making building gypsum powder from phosphogypsum by dry-process rotary kiln cement plant includes the following steps: drying and grinding block granular or loose phosphogypsum through a dry powder grinding system to make phosphogypsum dry powder, and then adding phosphorus The dry gypsum powder is transported into the dry powder warehouse, and the dry powder is transported into the dehydration system through the continuous metering system for discharge at the bottom of the warehouse to remove the crystal water in the gypsum to make dehydrated gypsum powder. The dehydrated gypsum powder is automatically discharged from the bottom slide pipe of the fifth-stage cyclone of the dehydration system The heat exchange conveyor cools down, and after cooling, it is sent to the aging warehouse for aging. The aged dehydrated gypsum powder is transported to the powder separator of the sorting and impurity removal system through the continuous metering system at the bottom of the warehouse, and the powder separator continuously separates The powder is the target product. The invention utilizes the production capacity transformation and transformation of the process equipment of the dry-process rotary kiln cement production line, and prepares building gypsum powder with phosphogypsum, which is environmentally friendly and energy-saving, has high production capacity, less investment and low 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 Patents(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