Phosphogypsum sintered brick and production process thereof

A technology of sintered bricks and phosphogypsum, applied in the field of sintered bricks, can solve problems such as environmental pollution, sulfur dioxide pollutants, and inability to achieve industrialization, and achieve the effects of saving land resources, protecting cultivated land, and widening sources

Active Publication Date: 2012-06-20
上海鑫晶山建材开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the composition and performance of phosphogypsum itself, it is difficult to sinter when making sintered bricks, and sulfur dioxide pollutants are easily produced during the sintering process, causing certain pollution to the environment and failing to meet the requirements of industrialization

Method used

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  • Phosphogypsum sintered brick and production process thereof
  • Phosphogypsum sintered brick and production process thereof
  • Phosphogypsum sintered brick and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Phosphogypsum sintered bricks, the sintered raw materials, by dry weight, include the following components by weight:

[0039] Phosphogypsum 25.5 parts by weight;

[0040] Coal gangue 32.2 parts by weight;

[0041] 26.5 parts by weight of river silt;

[0042] Dry powder additive 8 parts by weight.

[0043] The particle diameter of the coal gangue is 0.1-0.3mm, and the particle diameter of the dry powder additive is 0.1-0.3mm.

[0044] The preparation method of phosphogypsum fired brick (such as figure 1 Shown process flow diagram, wherein the machine adopted is conventional equipment in the prior art) is:

[0045] Add water to phosphogypsum with a water content of 5% to a water content of 13-18%; grind coal gangue and finished fired bricks to a particle size of 0.1-0.3mm; grind river silt with a water content of 20-40% to Aging, dehydration and drying to a moisture content of 13-18%; adding coal gangue, river silt and dry powder additives into phosphogypsum accordi...

Embodiment 2

[0050] Phosphogypsum sintered bricks, the sintered raw materials, by absolute dry weight, include the following components by weight:

[0051] Phosphogypsum 25.5 parts by weight;

[0052] 32.2 parts by weight of cinder;

[0053] 30 parts by weight of river silt;

[0054] Dry powder additive 8 parts by weight.

[0055] The particle diameter of the coal gangue is 0.1-0.3mm, and the particle diameter of the dry powder additive is 0.1-0.3mm.

[0056] The preparation method of phosphogypsum fired brick is as follows:

[0057] Add water to phosphogypsum with a water content of 5% until the water content is 13-18%; grind the cinder and finished fired bricks to a particle size of 0.1-3mm; age and dehydrate the river sludge with a water content of 40% drying until the moisture content is 13-18%; adding cinders, river silt and dry powder additives into the phosphogypsum according to the proportion and mixing, adding water to adjust the moisture content of the mixture to 13-18%, and ag...

Embodiment 3

[0061] Phosphogypsum sintered bricks, the sintered raw materials, by dry weight, include the following components by weight:

[0062] Phosphogypsum 20 parts by weight;

[0063] 27.6 parts by weight of coal gangue;

[0064] 22.5 parts by weight of river silt;

[0065] Dry powder additive 5 parts by weight.

[0066] The particle diameter of the coal gangue is 0.1-0.3mm, and the particle diameter of the dry powder additive is 0.1-0.3mm.

[0067] The preparation method of phosphogypsum fired brick is as follows:

[0068] Add water to phosphogypsum with a water content of 5% to a water content of 13-18%; grind coal gangue and finished fired bricks to a particle size of 0.1-0.3mm; age the river sludge with a water content of 25% , dehydration and drying to a moisture content of 13-18%; adding coal gangue, river silt and dry powder additives into phosphogypsum according to the proportion, mixing, adding water to adjust the moisture content of the mixture to 13-18%, and aging for ...

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Abstract

The invention relates to a sintered brick, and concretely relates to a sintered brick prepared by using phosphogypsum and a preparation process thereof. The phosphogypsum sintered brick comprises the following sintering raw materials, by oven dry weight, 17-29.75 parts of phosphogypsum, 27.6-41.4 parts of coal gangue or 25.5-38.25 parts of coal slag, 22.5-30 parts of river silt, and 5-15 parts ofa dry powder additive. The phosphogypsum sintered brick of the invention has the advantages of wide raw material source, realization of the resource recovery of the waste phosphogypsum, land resourcesaving, cultivated land protection, full utilization of the phosphogypsum waste which is extensive and easily generates pollution, and environment purification through changing wastes into valuables The obtained phosphogypsum sintered brick which has the advantages of thermal insulation, earthquake resistance and stress resistance, no peeling or distortion, non-frangibility, non-explosion, and high yield of above 99%, is suitable for the industrial production.

Description

technical field [0001] The invention relates to a sintered brick, in particular to a sintered brick made of phosphogypsum and a preparation process thereof. Background technique [0002] The phosphate fertilizer industry produces 1 ton of phosphoric acid (100% P 2 o 5 ) will produce 5-6 tons of phosphogypsum. A medium-sized phosphate compound fertilizer production enterprise discharges about 1 million tons of phosphogypsum a year. The annual output of phosphogypsum in my country is 20 million tons. Phosphogypsum refers to the solid waste produced when sulfuric acid is used to treat phosphate rock during the production of phosphoric acid. Its main component is calcium sulfate (commonly known as dihydrate gypsum), and it also contains a variety of other impurities, which are acidic powders. Due to the fluoride, free phosphoric acid, P contained in phosphogypsum 2 o 5 Impurities such as phosphogypsum and phosphate are the main factors that cause environmental pollution duri...

Claims

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Application Information

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IPC IPC(8): C04B38/00B09B3/00
Inventor 陈文光
Owner 上海鑫晶山建材开发有限公司
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