Sludge curing material for comprehensively utilizing phosphorous gypsum

A technology for solidifying materials and phosphogypsum, applied in the field of silt solidifying materials, can solve problems such as less than 10% effective utilization rate, and achieve the effects of reducing the difficulty of engineering construction, avoiding adverse effects and reducing construction costs

Inactive Publication Date: 2014-01-29
JIANGSU NATURE WAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effective utilization rate of phosphogypsum in China is less than 10%, and there is still a big gap from the national "Eleventh Five-Year" plan for the comprehensive utilization rate of industrial solid waste to reach 60%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition of each component in this embodiment is, by weight percentage, 20% of phosphogypsum; 24% of fly ash; 29% of mineral powder; 24% of lime; and 3% of activator. Wherein the activator is sulfate, after fully mixing the above proportioned sludge solidification material, 80 kg of solidification material is mixed into each cubic meter of sludge and stirred evenly. The sludge involved in this embodiment is common dredging sludge, and the water content is controlled below 80%. After the sludge is solidified, the unconfined compressive strength reaches 0.219MPa at 7d, 0.447MPa at 14d, and 0.538MPa at 28d. At the same time, the mechanical properties of the sludge solidified products tend to be stable. , at the same time, the permeability coefficient of the sludge after solidification is less than 10 -7 cm / s.

Embodiment 2

[0022] The difference between this example and Example 1 is that the activator is lignosulfonate. After fully mixing the above proportioned sludge solidification material, 80 kg of solidification material is mixed into each cubic meter of sludge and stirred evenly. The sludge involved in this embodiment is common dredging sludge, and the water content is controlled below 80%. After the sludge is solidified, the unconfined compressive strength reaches 0.178MPa at 7d, 0.417MPa at 14d, and 0.629MPa at 28d. At the same time, the mechanical properties of the sludge solidified products basically tend to be stable. , at the same time, the permeability coefficient of the sludge after solidification is less than 10 -7 cm / s.

Embodiment 3

[0024] The difference between the present embodiment and embodiment one is only that the exciter is a silicate. After the above proportioned sludge solidified material is fully mixed, 80 kilograms of solidified material is blended in every cubic meter of sludge and stirred uniformly. The sludge involved in this embodiment is common dredging sludge, and the water content is controlled below 80%. After the sludge is solidified, the unconfined compressive strength reaches 0.173MPa at 7d, 0.234MPa at 14d, and 0.547MPa at 28d. At the same time, the mechanical properties of the sludge solidified products basically tend to be stable. , at the same time, the permeability coefficient of the sludge after solidification is less than 10 -7 cm / s.

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Abstract

The invention discloses a sludge curing material for comprehensively utilizing phosphorous gypsum. The sludge curing material consists of the following materials in percentage by weight: 20%-60% of phosphorous gypsum, 5%-25% of coal ashes, 10%-30% of mineral powder, 8%-25% of limestone and 0.2%-3% of an activator. According to the sludge curing material, the waste phosphorous gypsum is used as the main material and supplemented with industrial waste such as the mineral powder, the coal ashes as well as limestone or cheap materials, thereby realizing recycling the industrial waste, and lowering environmental pollution; meanwhile, sludge curing production cost is lowered, quality of a sludge curing product is improved, engineering construction application such as road foundation and foundation filler is realized, needs of aggregate for building are lowered, and therefore, construction material cost and transportation cost are lowered.

Description

technical field [0001] The invention relates to a sludge solidification material, in particular to a sludge solidification material which comprehensively utilizes phosphogypsum. Background technique [0002] Phosphogypsum is a solid waste discharged during the production of phosphate fertilizer and phosphoric acid. About 4.5-5t of phosphogypsum is produced for every 1t of phosphoric acid produced. Phosphogypsum is divided into dihydrate gypsum (CaSO4 2H2O) and hemihydrate gypsum (CaSO4 1 / 2H2O), with dihydrate gypsum in the majority. In addition to the main component of calcium sulfate, phosphogypsum also contains a small amount of phosphoric acid, silicon, magnesium, iron, aluminum, and organic impurities. The total annual output of wet-process phosphoric acid in the world is about 260 million tons (calculated as P205), and the by-product phosphogypsum is about 150 million tons, and the utilization rate is only 4.3%-4.6%. It is estimated that China's demand for phosphate f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
Inventor 钟天雪汪潇倪志才
Owner JIANGSU NATURE WAY TECH
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