Method for producing aerated building block with phosphogypsum as main raw material

A technology of aerated blocks and phosphogypsum, applied in the field of comprehensive utilization of resources and new building materials, to achieve the effect of solving environmental pollution problems, saving natural resources, reducing secondary pollution and high cost problems

CN102515681AInactive Publication Date: 2012-06-27KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-06-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for producing an aerated building block with phosphogypsum as a main raw material. The method comprises the steps of: adding phosphogypsum, industrial waste residues, mineral activator main components and aluminum powder or aluminum paste to a stirrer with adjust rotation speed, adding water, stirring, slowly stirring for 3min, then rapidly stirring for 2min, then adding mineral activator auxiliary components and auxiliary agents, rapidly stirring for 3min, pouring the obtained slurry to a mold, foaming for 30-40min, then standing and maintaining at 50-55 DEG C for 4h, demolding, cutting, and carrying out normal-pressure steam maintaining for 16-24h to obtain the aerated block. Compared with the prior art, the method has the advantages that the obtained aerated building block has stable physical performance and good heat insulation property, the utilization rate of phosphogypsum is high, the process is simple, the cost is low, natural resources are saved, and the like. The obtained product can be widely applied to non-bearing partitions of urban high-rising buildings, low-temperature heat insulation of industrial equipment and the heat-insulation block of refrigeration warehouses.
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Description

technical field

[0001] The invention relates to a method for producing an aerated block using phosphogypsum as a main raw material, and belongs to the technical field of comprehensive utilization of resources and new building materials. Background technique

[0002] Phosphogypsum is a solid waste produced during the production of high-concentration phosphate fertilizers. According to incomplete statistics, the domestic stockpile of phosphogypsum slag has reached more than 100 million tons, and 30 million tons of phosphogypsum slag will be newly produced every year. About 10%, the rest is still mainly treated by stacking. With the increase in the production of high-concentration phosphorus compound fertilizers and the decrease in the grade of raw material phosphate rock, the production of phosphogypsum slag will increase. It is estimated that by 2012, the national production of phosphogypsum slag will reach 55 million tons. The resulting environmental pollution and land ...

Examples

Embodiment 1

[0036] Embodiment 1: This is the method for producing aerated block with phosphogypsum as the main raw material, the specific content is as follows:

[0037] 1, the raw material composition is as follows in this method:

[0038] (1) Main materials: phosphogypsum 21kg, blast furnace slag 7.5kg, hydrated lime 1.5kg;

[0039] (2) Process water is alkali-containing wastewater from paper mills, and the mass ratio of water to main materials is 1:0.85;

[0040] (3) Mineral stimulant additional components: sodium sulfate and sodium chloride are 1.2% of the mass of slaked lime, and the mass ratio of sodium sulfate to sodium oxide is 1:1;

[0041] (4) Auxiliary raw materials: 0.05% of aluminum powder as the main material; 0.5% of additives as the main material, including 70 parts of water glass, 25 parts of sodium hydroxide, and 5 parts of sodium lignosulfonate.

[0042] 2, the concrete operation of the present invention is as follows:

[0043] Mix and age 7.5kg of blast furnace slag...

Embodiment 2

[0045] Embodiment 2: This is the method for producing aerated block with phosphogypsum as the main raw material, the specific content is as follows:

[0046] 1, the raw material composition is as follows in this method:

[0047] (1) Main materials: phosphogypsum 18kg, yellow phosphorus slag 6kg, activated iron tailings 2.4kg, carbide slag (dry basis) 3.6kg;

[0048] (2) The process water is recycled reclaimed water, and the mass ratio of water to main material is 1:0.95(m / m);

[0049] (3) Additional components of mineral activator: sodium sulfate and sodium oxide are 0.5% of the mass of carbide slag, and the mass ratio of sodium sulfate and sodium oxide is 1:0.5;

[0050] (4) Auxiliary raw materials: 0.04% of aluminum powder as the main raw material; 0.3% of additives as the main raw material, including 70 parts of water glass, 25 parts of sodium hydroxide, and 5 parts of calcium lignosulfonate.

[0051] 2, the concrete operation of the present invention is as follows:

[0...

Embodiment 3

[0054] Embodiment 3: this is the method for producing aerated block with phosphogypsum as the main raw material, the specific content is as follows:

[0055] 1, the raw material composition is as follows in this method:

[0056] (1) Main materials: phosphogypsum 19.5kg, yellow phosphorus slag 4.5kg, fly ash 4.0kg, slaked lime 2.0kg;

[0057] (2) The process water is condensed water, and the mass ratio of water to main material is 1:0.9;

[0058] (3) Mineral activator additional components: sodium sulfate and sodium oxide are 0.4% of slaked lime, and the ratio of sodium sulfate to sodium oxide is 1:0.8;

[0059] (4) Auxiliary raw materials: aluminum powder is 0.05% of the main raw material; additives are 0.4% of the main raw material, including 60 parts of water glass, 25 parts of sodium hydroxide, 10 parts of calcium lignosulfonate, lignosulfonic acid Sodium 5 parts.

[0060] 2, the concrete operation of the present invention is as follows:

[0061] Mix and age 4.5kg of ye...