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Method for source modification treatment of fluoro-gypsum

A fluorogypsum and recycling technology, applied in the field of solid waste recycling, can solve the problems of long treatment and maintenance time, slow speed of dihydrate gypsum, restricting the utilization of fluorogypsum, etc., so as to overcome uneven quality and shorten hardening time. , the effect of shortening the maintenance time

Inactive Publication Date: 2005-01-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current comprehensive treatment, fluorine gypsum is mainly added to lime or limestone for neutralization reaction, so that the pH value is adjusted to neutral or alkaline, and then used as a cement retarder. The treated fluorine gypsum phase is still anhydrous gypsum. Mainly, although this treatment can solve the acid pollution of fluorine gypsum, it has a certain impact on the performance of cement, especially the cement produced with anhydrous fluorine gypsum as a set regulator has a negative impact on various concrete admixtures, such as causing Cement rapid setting, strength decline, etc., thus greatly restricting the utilization of fluorine gypsum
And the speed that anhydrous fluorine gypsum is converted into dihydrate gypsum is quite slow, adopts accelerators such as sodium sulfate, potassium sulfate, aluminum sulfate, potassium nitrate to add in the patent application number 92108727. Quicklime neutralization treatment, the treatment time is 24 hours, and the crystal water can only reach 11%-13% after one month of water curing, and the process is complex, the treatment and maintenance time is long, it takes a lot of space, and the technology is difficult to be widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: get 94% of fluorine gypsum, 2.0% of composite active activator (sodium silicate+calcium awn+potassium awn, sodium silicate 1.2%, calcium awn 0.6%, potassium awn 0.2%,), unslaked lime 1%, carbide slag 3%. Add the fluorine gypsum to the basic material and the composite active activator according to the metering ratio, pre-mix in the forced mixer for 1-2 minutes, add water and stir for 3-5 minutes, the water consumption accounts for the mixed dry material (fluorine gypsum, alkaline material and Composite active activator) 25%, after the stirring is completed, it can be sent to the rainproof storage yard to stand still, and after 4 hours, it will be excavated into small pieces and piled up on the maintenance site, and it will be watered twice a day for maintenance. Standard, 10 days can leave the factory, get modified fluorine gypsum products. The modified fluorine gypsum has a crystal water content of 12.0wt%, SO 3 The content is 45.2%, and the pH value is ...

Embodiment 2

[0015] Embodiment 2: 93% of fluorogypsum, 2% of composite active stimulator (industrial alum+sodium sulfate+sodium fluorosilicate, industrial alum 1.0%, sodium sulfate 0.8%, sodium fluorosilicate 0.2%.), calcium hydroxide 2 %, 1% cement, 2% alkali slag, add fluorine gypsum to the basic material according to the metering ratio, pre-mix in the forced mixer for 1-2 minutes, add the aqueous solution containing the activator and stir for 3-5 minutes [the water consumption accounts for the mixing Dry materials (fluorogypsum, alkaline materials and composite active activators) 20%, and first dissolve the composite active activators into water], after the stirring is completed, it can be sent to the rainproof yard for standing, and after standing for 4 hours, excavate Pile it up in small pieces to the maintenance site, water twice a day for maintenance (the amount of water is based on the fact that all materials are wet), and leave the factory in 10 days to obtain modified fluorogypsum...

Embodiment 3

[0016] Embodiment 3: 97% of fluorine gypsum, 1% of composite activity stimulating agent (industrial alum+sodium bisulfate+sodium sulfate, industrial alum 0.4%, sodium bisulfate 0.2%, sodium sulfate 0.4%.), alkaline material 2% ( Soda slag + lime, 1.0% alkali slag, 1.0% lime.), add fluorine gypsum to the basic material according to the metering ratio, pre-mix in the forced mixer for 1-2 minutes, add the aqueous solution containing the activator and stir for 3-5 minutes [Water consumption accounts for 15% of the mixed dry material (fluorogypsum, alkaline material and composite active activator), and the composite active activator is first dissolved in water], after the stirring is completed, it can be sent to the rainproof storage yard and left to stand After 6 hours, it is excavated into small pieces and piled up in the maintenance site, watered twice a day for maintenance (the amount of water sprayed is based on the fact that all materials are wet), and it can be shipped in 10 ...

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PUM

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Abstract

The invention discloses a method for source modification treatment of fluoro-gypsum which comprises the steps of, (1) raw material selection, charging composite active triggering agent and alkaline material into the fluoro-gypsum, wherein the mass fraction of each components are, fluoro-gypsum 93-97, composite active triggering agent 1-2, alkaline material 2-5, (2) agitating and mixing, transferring to rainproof yard, stewing, (3) stacking, trickling and maintaining. The modified fluoro-gypsum is applied to cement production.

Description

technical field [0001] The invention belongs to the field of resourceful treatment of solid waste, and in particular relates to a method for resourceful modification of fluorogypsum, a chemical industry by-product. The modified fluorogypsum is used in cement production. Background technique [0002] Fluorogypsum is a waste residue mainly containing calcium sulfate produced by the reaction of sulfuric acid and fluorite during the production of hydrofluoric acid. It is mainly produced in inorganic fluoride and organic fluoride production plants and other hydrofluoric acid production plants. 1 ton of hydrofluoric acid can produce 4 to 5 tons of fluorogypsum, and the output is quite considerable. At present, the annual domestic output reaches more than 1 million tons. Fluorogypsum contains residual fluorite and sulfuric acid when it comes out of the kiln, and the fluorine and sulfuric acid content in the leachate is relatively high, both of which exceed the limit specified in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C04B11/00C04B22/14
Inventor 杨新亚王锦华
Owner WUHAN UNIV OF TECH
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