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Purification ardealite cement retarder and preparation process and device thereof

A technology of cement retarder and phosphogypsum, which is applied in the field of phosphogypsum cement retarder, can solve the problems of incomplete treatment, small amount of phosphogypsum used, and cannot be completely replaced, so as to be beneficial to environmental protection and improve comprehensive utilization rate , the effect of saving resources and cost

Inactive Publication Date: 2016-02-10
SICHUAN SHIFANG XINGTIANFENG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that it still has the following defects: (1) The amount of phosphogypsum used in the formula is small, resulting in slow cement hydration, poor coagulation, and low early strength; (2) Rotary disc pelletizing machine is used The water in the ball is large (about 20% water), and the natural drying storage time is long
Due to the inhomogeneity of the modification process of the phosphogypsum cement retarder prepared by this method, the treatment of water-soluble phosphorus, fluorine, and organic matter is not thorough, so this kind of phosphogypsum cement retarder cannot completely replace natural gypsum as a retarder.

Method used

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  • Purification ardealite cement retarder and preparation process and device thereof
  • Purification ardealite cement retarder and preparation process and device thereof
  • Purification ardealite cement retarder and preparation process and device thereof

Examples

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Effect test

Embodiment 1

[0048] The present invention provides a cement retarder prepared by purifying phosphogypsum through multiple physical and chemical methods. The cement retarder is mainly made of phosphogypsum through ball milling, washing with a belt filter, dehydrating, re-slurrying, and one-time modification. It is made by centrifugal dehydration and secondary modification. The formula of cement retarder is as follows (by weight percentage):

[0049] 91~94% of phosphogypsum;

[0050] No. 1 modifier (calcium carbide slag or kiln dust) 4~6%;

[0051] The second modifier (silica active agent) is 2 to 3%.

[0052] And as figure 1 , 2 As shown, figure 1 To prepare the process of this kind of phosphogypsum cement retarder, figure 2 It is the device that realizes the process. Specifically, in this embodiment, the device for preparing a cement retarder includes a ball milling system, a filtering and washing system, a repulping primary modification system, a dehydration secondary modification system, an as...

Embodiment 2

[0086] Such as image 3 As shown, compared with Embodiment 1, this embodiment also includes a high-position slurry tank 11, the outlet of the slurry pump 10 is connected to the inlet of the high-position tank 32, the outlet of the high-position tank 32 flows into the belt filter 11, and the high-position tank 32 overflows The port is connected with the slurry tank 8. In this embodiment, the ground gypsum slurry enters the slurry tank 8, and is sent to the slurry high-position tank 11 by the slurry pump 10 to adjust the liquid-solid ratio (1.25-1.30:1), and then enters the belt filter 12 for liquid Solid washing separation. The rest of the undescribed parts are the same as in Embodiment 1.

[0087] After the slurry passes through the slurry high-position tank 11, it can be ensured that the slurry enters the belt filter 12 evenly and stably, which is beneficial to the uniform thickness of the filter cake produced by the belt filter 12 and stable washing effect.

Embodiment 3

[0089] Such as Figure 4 As shown, compared with Embodiment 1, this embodiment uses a centrifuge 34 instead of the filter press 33, the outlet of the thick slurry pump 32 is connected with the inlet of the centrifuge 34, the filter cake is white fertilizer, and the filtrate enters the mother liquor tank 36 through the pipeline. The rest of the undescribed parts are the same as in Embodiment 1.

[0090] The white fertilizer thick slurry is separated and filtered by the centrifuge 34. The advantage is that the filter cake has a lower moisture content than the filter cake obtained by the filter press 33, which is beneficial to the drying treatment of the white fertilizer in the later stage.

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Abstract

The invention discloses a purification ardealite cement retarder. The ardealite cement retarder is prepared from ardealite subjected to ball-milling pulping, washing and dewatering through a belt filter, repulping, primary modification, centrifugal dewatering and secondary modification. The ardealite cement retarder is prepared from, by weight, 91-94% of ardealite, 4-6% of acetylene sludge or kiln dust and 2-3% of siliceous activator. The purification ardealite cement retarder has the advantages of being high in ardealite purification degree, stable in product quality, free of fire coal drying, low in energy consumption and capable of completely replacing natural gypsum to be used for production of general purpose portland cement, thereby having good environmental protection and economic benefits.

Description

Technical field [0001] The invention relates to a phosphogypsum cement retarder, in particular to a purification type phosphogypsum cement retarder and its preparation process and device. Background technique [0002] Phosphogypsum is an industrial solid waste discharged during the production of wet-process phosphoric acid by a phosphorous chemical industry. The storage of phosphogypsum not only takes up a lot of land and funds, but also pollutes groundwater, surface water and the atmosphere. The use of industrial solid waste phosphogypsum to make cement retarders can increase the utilization rate of waste, reduce the impact of waste on the ecological environment, reduce the arable land occupied by waste stacking, save resources, and reduce production costs. It has been published in public publications. There are related reports. [0003] At present, there are several related technologies for making cement retarder from phosphogypsum: [0004] 1. Add quicklime to the phosphogypsum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B103/22
Inventor 张小东王大为张林
Owner SICHUAN SHIFANG XINGTIANFENG TECH CO LTD
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