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

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

Example Embodiment

[0037] Example 1

[0038] Phosphogypsum sintered brick, its sintering raw materials, based on absolute dry weight, include the following components by weight:

[0039] 25.5 parts by weight of phosphogypsum;

[0040] 32.2 parts by weight of coal gangue;

[0041] 26.5 parts by weight of river silt;

[0042] Dry powder additives 8 parts by weight.

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

[0044] Preparation method of phosphogypsum fired brick (such as figure 1 The process flow chart shown in which the machine used is conventional equipment in the prior art) is:

[0045] Add phosphogypsum with a water content of 5% to a water content of 13-18%; grind coal gangue and finished sintered bricks to a particle size of 0.1-0.3mm; pass a river sludge with a water content of 20-40% Aging, dehydration and drying to a moisture content of 13-18%; according to the proportion of coal gangue, river sludge and dry powder add...

Example Embodiment

[0049] Example 2

[0050] Phosphogypsum sintered brick, its sintering raw materials, based on absolute dry weight, include the following components by weight:

[0051] 25.5 parts by weight of phosphogypsum;

[0052] 32.2 parts by weight of cinder;

[0053] 30 parts by weight of river silt;

[0054] Dry powder additives 8 parts by weight.

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

[0056] The preparation method of phosphogypsum sintered brick is:

[0057] Add phosphogypsum with 5% water content to 13-18% water content; pulverize coal slag and finished sintered bricks to a particle size of 0.1-3mm; age and dehydrate river sludge with 40% water content Drying to a moisture content of 13-18%; adding coal slag, river sludge and dry powder additives to the phosphogypsum according to the ratio, and adding water to adjust the moisture content of the mixture to 13-18%, and aging for 5-7 days. After aging, fully agi...

Example Embodiment

[0060] Example 3

[0061] Phosphogypsum sintered brick, its sintering raw materials, based on absolute dry weight, include the following components by weight:

[0062] 20 parts by weight of phosphogypsum;

[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 size of the coal gangue is 0.1-0.3 mm, and the particle size of the dry powder additive is 0.1-0.3 mm.

[0067] The preparation method of phosphogypsum sintered brick is:

[0068] Add phosphogypsum with a water content of 5% to a water content of 13-18%; grind coal gangue and finished sintered bricks to a particle size of 0.1-0.3mm; age river sludge with a water content of 25% , Dehydrate and dry to a moisture content of 13-18%; add coal gangue, river sludge and dry powder additives to the phosphogypsum according to the ratio, mix and add water to adjust the moisture content of the mixture to 13-18%, and age for 7 days. After ag...

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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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