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Method for preparing gypsum building block with titanium gypsum

A technology of gypsum block and titanium gypsum, applied in the field of building materials, can solve the problems of stacking and pollution of titanium gypsum

Inactive Publication Date: 2010-12-22
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new way of utilizing titanium gypsum to solve the problem of stacking and pollution of titanium gypsum; at the same time, it provides a method for preparing building gypsum blocks, which can effectively utilize waste residues produced in chemical production, and is energy-saving and environmentally friendly

Method used

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  • Method for preparing gypsum building block with titanium gypsum
  • Method for preparing gypsum building block with titanium gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The titanium gypsum is crushed to a particle size of 80 μm or less, and then dried at 180°C to obtain hemihydrate gypsum. By weight percentage, 30% titanium gypsum powder (dehydrated hemihydrate gypsum), 30% semi-dry desulfurization Ash, 35% lightweight aggregate, 2% gypsum activator, 2% retarder, and 1% water reducer are mixed evenly, wherein the gypsum activator is green vanadium, the retarder is citric acid, and the water reducer It is melamine, and the lightweight aggregate is water-quenched blast furnace slag; add 37% water by weight to the mixed material, mix and stir evenly, pour it into the mold, and vibrate to shape; after 2 hours of natural curing, the slurry hardens, remove the mold and dry it Then get the gypsum block. The gypsum block was tested, and the flexural strength of the gypsum block was 2.9MPa, the compressive strength was 8.5MPa, and the bulk density was 1.1g / cm 3 , The softening coefficient is 0.65, and all the above indicators have reached the ...

Embodiment 2

[0027] Titanium gypsum is crushed to a particle size below 80 μm, and then dried at 200° C. to obtain hemihydrate gypsum. By weight percentage, 60% titanium gypsum powder (dehydrated hemihydrate gypsum), 25% lightweight aggregate, 3% gypsum activator, 1% retarder, 1% water reducer and 10% paper fiber are mixed evenly, wherein the gypsum activator is sodium sulfate, the retarder is citric acid, and the water reducer is melamine formaldehyde Resin, lightweight aggregate is light ceramsite; add 38% water by weight to the mixed material, mix and stir evenly, pour into the mold, and vibrate to shape; after 2 hours of natural curing, the slurry hardens, remove the mold and dry Then get the gypsum block. The gypsum block was tested, and the flexural strength of the gypsum block was 2.5MPa, the compressive strength was 6.8MPa, and the bulk density was 0.95g / cm 3 , The softening coefficient is 0.57, and all the above indicators have reached the national building materials industry sta...

Embodiment 3

[0029] The titanium gypsum is crushed to a particle size of 80 μm or less, and then dried at 200°C to obtain hemihydrate gypsum. By weight percentage, 60% titanium gypsum powder (dehydrated hemihydrate gypsum), 15% semi-dry desulfurization Ash, 15% lightweight aggregate, 3% gypsum activator, 1% retarder, 1% water reducer and 5% paper fiber are mixed evenly, wherein the gypsum activator is green vanadium, and the retarder is Citric acid, water reducing agent is melamine, light aggregate is floating beads; add water with a weight percentage of 39% to the mixed material, mix and stir evenly, pour it into the mold, and vibrate to form; after 2 hours of natural, the slurry hardens, disassemble After the mold is dried, a gypsum block is obtained. The gypsum block was tested, and the flexural strength of the gypsum block was 5.0MPa, the compressive strength was 1.8MPa, and the bulk density was 0.85g / cm 3 , The softening coefficient is 0.45, and all the above indicators have reached ...

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Abstract

The invention discloses a method for preparing a gypsum building block with titanium gypsum. The method comprises the following steps: crushing titanium gypsum to fine powder of which grain size is less than 80mu m, dewatering and drying at 180-220 DEG C; mixing the dried titanium gypsum powder, semidry FGD residues, light-weight aggregate, paper fibre, gypsum booster, retarder and water reducing agent evenly according to a certain ratio, then adding water to stir evenly; pouring the evenly mixed slurry in a standard mould, performing vibro-moulding; and performing natural curing for 2 hours, demoulding, and airing to obtain the gypsum building block. The gypsum building block prepared by the method of the invention is characterized by small volume, low density, high strength and softening coefficient and the like; and the physical performance of the prepared gypsum building block completely meets the national building material industry standard JC / T698-1998. The method for preparing the gypsum building block with titanium gypsum provided by the invention provides a new application way of titanium gypsum and solves the stacking problem of titanium gypsum and the environmental pollution problem.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing gypsum blocks from titanium gypsum. Background technique [0002] Titanium gypsum is a waste residue with dihydrate gypsum as the main component produced when lime (or carbide slag) is added to neutralize a large amount of acidic wastewater when sulfuric acid is used to produce titanium dioxide. For every ton of titanium dioxide produced, 100 to 200 tons of acidic wastewater with a concentration of 10% is produced. About 160,000 to 240,000 tons of titanium gypsum is produced in the country every year. At present, only a small amount is used as a cement coagulant, and the rest is piled up in slag yards, occupying a lot of land and causing pollution to the environment. [0003] Due to the many impurities and low grade of titanium gypsum, the research on it at home and abroad is still in the exploratory stage. The Chinese patent with publication number CN10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/52B28B1/14B28B1/08
CPCC04B28/14Y02W30/91C04B14/02C04B18/06C04B18/241C04B20/0076C04B40/0028C04B2103/10C04B2103/20C04B2103/302
Inventor 郝建璋黎建明张金阳洪俊辉
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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