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A method for producing building gypsum powder in one step by using industrial waste gypsum

A technology for building gypsum powder and industrial waste gypsum, applied in the field of building gypsum powder manufacturing, can solve the problems of large influence on hydration performance and strength, unsatisfactory separation and impurity removal effect, etc., and achieves reliable equipment quality, small investment and adaptability. strong effect

Active Publication Date: 2022-04-08
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

[0005] For the fine-sized impurity particles in phosphogypsum that affect the hydration performance and strength of phosphogypsum construction gypsum powder, the existing separation method is to remove some of the fine-sized impurities by pulping, washing and centrifugal separation before drying and dehydration For granular materials, the effect of separation and removal of impurities is objectively unsatisfactory
For building gypsum powder, a reasonable particle size range is conducive to improving strength, but too many ultrafine particles have a greater impact on hydration performance and strength, and the separation of ultrafine particles that affect strength in building gypsum powder has not yet been achieved. See any research and practice reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The phosphogypsum bulk material that has been exposed to rain many times in an open-air storage yard of an enterprise is selected. It is off-white. Sweep ball mill grinding system one-step method of building gypsum powder:

[0031] The temperature of the hot air entering the ball mill is adjusted to 200±20°C, and the water-containing phosphogypsum is continuously fed into the ball mill from the feed port of the feed end of the ball mill, and the temperature of the discharge port of the ball mill is controlled at 105°C±10°C, and the temperature of the dust collector is at 105°C ±10°C. The powder separator continuously separates the construction gypsum powder material, and the bag filter continuously collects the ultrafine powder material.

[0032] Sampling shall be tested according to GB / T9776-2008 (Building Gypsum) standard.

[0033] Take 12 building gypsum powder samples separated by the powder sorting machine and mix them evenly before testing: the whiteness is 47 d...

Embodiment 2

[0036] The phosphogypsum that has been washed in the storage yard of a phosphogypsum washing production line is selected. It is off-white. The detected moisture content fluctuates from 21.7 to 24.6%, and the (dry basis) dihydrate gypsum content fluctuates from 89.1 to 96.2%. One-step construction gypsum powder with ball mill grinding system:

[0037] The temperature of the hot air entering the ball mill is adjusted to 225°C±25°C, and the phosphogypsum containing water is continuously fed into the ball mill from the feed port of the feed end of the ball mill, and the temperature of the discharge port of the ball mill is controlled at 117°C±10°C, and the temperature of the dust collector at 111 ℃±10℃. The powder separator continuously separates the construction gypsum powder material, and the bag filter continuously collects the ultrafine powder material.

[0038] Sampling shall be tested according to GB / T9776-2008 (Building Gypsum) standard.

[0039] Take 16 construction gyps...

Embodiment 3

[0042] Fresh phosphogypsum bulk material from a chemical company is selected, gray-white, and the detected moisture content fluctuates between 22.1-24.3%, and the (dry basis) dihydrate gypsum content fluctuates between 87.6-94.1%. Based on this, the phosphogypsum is crushed in one step by using the air-swept ball mill grinding system. Legal construction gypsum powder:

[0043] The temperature of the hot air entering the ball mill is adjusted to 250 °C ± 20 °C, and the phosphogypsum containing water is continuously fed into the ball mill from the feed port of the feed end of the ball mill, and at the same time, the mass ratio of phosphogypsum containing water is 1.5% by continuous spraying from the feed port of the ball mill For milk of lime, the temperature at the outlet of the ball mill is controlled at 120°C ± 10°C, and the temperature of the dust collector is at 113°C ± 10°C. The powder separator continuously separates the construction gypsum powder material, and the bag fi...

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Abstract

A method for producing construction gypsum powder in one step by using industrial waste gypsum. The hot air is continuously fed into the ball mill, and the phosphogypsum is continuously fed into the ball mill from the feed port of the feed end of the ball mill. Under the repeated impact and grinding of balls or / and forging, the phosphogypsum material that tumbles with balls or / and forging and flows with hot air is simultaneously dried, dehydrated and ground to convert phosphogypsum into semi-hydrated Gypsum and anhydrous soluble gypsum are the main mineral components of construction gypsum powder mixture; construction gypsum powder mixture is discharged from the discharge port of the ball mill discharge end with the hot and humid air flow, and directly enters the powder classifier through the connecting pipe, and the powder classifier is sorted The construction gypsum powder with a predetermined particle size distribution range is the target product; the rest of the ultra-fine particle size powder and light impurities are discharged from the exhaust gas outlet of the powder classifier with the hot and humid airflow, and directly enter the dust collector through the connecting pipe, and are collected by the dust collector. The wet exhaust gas after dust purification by the filter is emptied. The invention 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 making building gypsum powder in one step by using industrial waste gypsum. Background technique [0002] Industrial waste gypsum, such as phosphogypsum, desulfurization gypsum, lemon gypsum, borogypsum, titanium gypsum, etc., mostly contain some impurities harmful to gypsum materials, especially phosphogypsum, which has a large amount of current accumulation and new increase as bulk industrial waste residue, its gypsum grade , impurity composition and content, crystal form, particle size distribution, acidic pH value, moisture content, etc., vary with mine quality, fineness, process equipment and process control parameters, and its color is also from off-white to off-white, or yellow The difference from white to yellow makes the development and utilization of phosphogypsum to replace natural gypsum unsatisfactory. With the existing techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C04B11/036
CPCC04B11/26C04B11/262C04B11/264C04B11/036
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司