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Gypsum based gel material prepared from undisturbed industry by-product gypsum and preparation thereof

A technology of industrial by-product gypsum and cementitious materials, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc. It can solve the problems of less product varieties, poor water resistance, and strength decline, and achieve simplified production processes , reduce production costs, and simplify the production process

Inactive Publication Date: 2011-02-16
镇江沃地新材料投资有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To build a workshop with an annual output of only 100,000 tons of semi-water building gypsum powder, the investment in the construction of equipment and workshops alone needs to be more than 15 million yuan. If the investment in building a workshop for the production of gypsum building materials is also considered, the investment will be very large. In addition, because the sales price of existing gypsum building material products is higher than that of other building material products of the same type, there are few types of products and poor water resistance. The sales performance in the building material market is not very good, and the investment is large and risky. Unfavorable for investors to make investment decisions
[0008] 2. Increased production costs
Using such high-cost semi-hydrated building gypsum powder to prepare gypsum cementitious materials to produce gypsum building material products will inevitably greatly increase the production cost of gypsum building material products, which is not conducive to the survival and development of gypsum building material products enterprises.
[0009] 3. The water resistance of the gypsum building material products produced by this method is extremely poor, which restricts the application and promotion of gypsum building material products
Since the solubility of dihydrate gypsum in water is up to 2.05g / L, the main component of the gypsum building material products prepared by this traditional method is dihydrate gypsum, so it is not resistant to water, and its strength will drop significantly when it encounters water erosion, making the existing The application and promotion of gypsum building material products have been greatly restricted
[0010] 4. It will cause pollution to the surrounding environment
It will put the manufacturer in a dilemma

Method used

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  • Gypsum based gel material prepared from undisturbed industry by-product gypsum and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A gypsum-based cementitious material prepared from undisturbed industrial by-product gypsum, which is composed of the following mass percentages: titanium gypsum: 65wt%, siliceous slag: 10wt%, blast furnace slag: 23wt%, and calcium carbide slag: 2wt%.

[0038] The method for preparing the gypsum-based cementitious material, the preparation steps are: measuring the attached water content of the original industrial by-product gypsum, calculating the weight of the attached water per kilogram of the original industrial gypsum and the weight of the original industrial gypsum on a dry basis; 65wt% of the titanium gypsum; 10wt% siliceous slag, 23wt% blast furnace slag (a mixture of siliceous slag and blast furnace slag, ground to a specific surface area ≥ 350M 2 / Kg, its activity index 7 days ≥ 75%, 28 days ≥ 95%, fluidity ratio ≥ 90%); calcium carbide slag 2wt% (content of active CaO ≥ 70wt%, undigested residue ≤ 10wt%, 0.08mm square hole The fineness of the sieve is less tha...

Embodiment 2

[0041] A gypsum-based cementitious material prepared from undisturbed industrial by-product gypsum, which is composed of the following mass percentages: desulfurized gypsum 50wt%; blast furnace slag 30wt%; fly ash 15wt%; lime slag 5wt%.

[0042] The method for preparing the gypsum-based cementitious material, the preparation steps are: measure the attached moisture of the original industrial by-product gypsum, calculate the weight of the attached water per kilogram of the original industrial gypsum and the weight of the original industrial gypsum on a dry basis; desulfurized gypsum: 50wt% ; Blast furnace slag 30wt%, fly ash 15wt% (the ratio mixture of blast furnace slag and fly ash, through grinding to specific surface area ≥ 350M 2 / Kg, its activity index 7 days ≥ 75%, 28 days ≥ 95%, fluidity ratio ≥ 90%); lime residue 5wt% (content of active CaO ≥ 70wt%, undigested residue ≤ 10wt%, 0.08mm square hole The fineness of the sieve is less than or equal to 10wt%), and the ingredie...

Embodiment 3

[0045] A gypsum-based cementitious material prepared from undisturbed industrial by-product gypsum, which is composed of the following mass percentages: phosphogypsum: 35wt%, siliceous slag 10wt%, blast furnace slag 15wt%, steel slag 5wt%, furnace bottom slag 25wt%, Calcium carbide slag 3wt%, quicklime 4wt%, lime slag 3wt%.

[0046] The method for preparing the gypsum-based cementitious material, the preparation steps are: measure the attached moisture of the original industrial by-product gypsum, calculate the weight of the attached water per kilogram of the original industrial gypsum and the weight of the original industrial gypsum on a dry basis; according to phosphogypsum: 35wt% 10wt% of siliceous slag, 15wt% of blast furnace slag, 5wt% of steel slag, 25wt% of furnace bottom slag (a proportion mixture of siliceous slag, blast furnace slag, steel slag and furnace bottom slag, ground to specific surface area ≥ 350M 2 / Kg, its activity index ≥ 75% in 7 days, ≥ 95% in 28 days,...

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Abstract

The invention provides a gypsum based gelled material prepared from original state industrial by-product gypsum. The gelled material comprises the following components in mass percentage: 36 to 65 percent of original state dihydrate gypsum phase industrial by-product gypsum, 30 to 60 percent of silicon-aluminum active mineral material and 2 to 10 percent of alkali-activated material; the originalstate dihydrate gypsum phase industrial by-product gypsum which does not need to have impurities and adsorption water removed and be finely ground is directly mixed with the alkali-activated materialand the active mineral material according a ratio, and the gypsum based gelled material with high strength, good water resistance and perfect comprehensive performance can be prepared by the extremely simple mixing-stirring step, and by taking the gypsum based gelled material as the base material, various gypsum building material products with high strength, water resistance and perfect comprehensive performance can be produced; therefore, the conventional mode of producing the gypsum building material product that the semi-hydrated building gypsum powder must be firstly prepared by calciningand dewatering, and the semi-hydrated building gypsum powder is used as the base material to produce the gypsum building material product is changed.

Description

1. Technical field [0001] The invention belongs to the technical field of gypsum-based cementitious materials, in particular to a gypsum-based cementitious material prepared from undisturbed industrial by-product gypsum and a preparation method thereof. 2. Background technology [0002] Industrial by-product gypsum, also known as chemical gypsum, is a by-product mainly composed of calcium sulfate produced in the industrial production process. Its chemical composition and physical properties are similar to natural gypsum, but because it contains certain impurities, the attached water Large, the appearance is a powder with a certain amount of water, which brings certain difficulties to its comprehensive utilization. [0003] There are many types of industrial by-product gypsum, such as phosphogypsum produced by phosphate fertilizer production enterprises to produce phosphate fertilizer, desulfurized gypsum produced by desulfurization and purification of flue gas in coal-fired ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
CPCC04B28/14C04B2111/27Y02W30/91C04B14/047C04B18/067C04B18/08C04B18/141C04B18/142C04B18/146C04B22/064
Inventor 法林辛邹永平诸文镇
Owner 镇江沃地新材料投资有限公司
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