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Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge

A gypsum-based, drying agent technology, applied in dewatering/drying/concentrating sludge treatment, cement production, etc., can solve the problems of inconvenient on-site treatment of lake bottom sludge, poor water resistance of sludge, large input equipment, etc. Small, short time, the effect of improving the utilization rate

Active Publication Date: 2014-09-17
武汉湖振煜环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are three main methods of sludge drying technology: thermal drying, biological drying and inorganic material drying. Among them, biological drying is rarely used, and thermal drying technology is the most commonly used, but it consumes a lot of energy and investment. The equipment is large, and it is inconvenient to treat the lake bottom sludge on site. Lime and cement are mostly used for drying inorganic materials, but the drying time is long, and the water resistance of the dried sludge is poor. In addition, the production of lime and cement requires calcination. and limited resources

Method used

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  • Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge
  • Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge
  • Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge

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Embodiment 1

[0029] After phosphogypsum, slag, steel slag and clinker were mixed by mass percentage 40:33:15:12, stirred for 30min to obtain a cementitious material, and added sodium lignosulfonate (C 20 H 24 Na 2 O 10 S 2 ), to obtain phosphogypsum-based sludge drying agent, wherein sodium lignosulfonate (C 20 H 24 Na 2 O 10 S 2 ) accounts for 0.75% of the total mass of the cementitious material. The measured specific surface area of ​​the phosphogypsum is 765.2m 2 / kg.

[0030] This experiment is a sludge drying experiment. The original moisture content of the dewatered sludge is 81.4%, and the cementitious material is prepared according to the above ratio. The cementitious material is weighed according to 15% of the total mass of the dewatered sludge, poured into a mortar mixer and mixed evenly for 3 minutes, and then the dried sludge is taken out. Put it in a sealed container, and maintain it under the standard curing conditions of temperature 20℃±1℃, humidity ≥95%, and take...

Embodiment 2

[0033] After the phosphogypsum, slag, steel slag and clinker were mixed according to the mass percentage of 60:20:5:15, they were stirred for 30 minutes to obtain a cementitious material, and calcium oxalate (Ca) was added to the cementitious material. 2 C 2 O 4 ), to obtain phosphogypsum-based sludge drying agent, wherein calcium oxalate (Ca 2 C 2 O 4 ) accounts for 1.0% of the total mass of the cementitious material. The measured specific surface area of ​​the phosphogypsum is 800.5m 2 / kg.

[0034] This experiment is a sludge drying experiment. The average moisture content of the dewatered sludge in its original state is 77.2%, and the gelling material is prepared according to the above ratio. The gelling material is weighed according to 15% of the total mass of the dewatered sludge, poured into a mortar mixer, mixed evenly and stirred for 3 minutes, and then taken out and dried. The sludge is placed in a sealed container and maintained under the standard curing cond...

Embodiment 3

[0037] After phosphogypsum, slag, steel slag and clinker were mixed by mass percentage 50:30:10:10, stirred for 30min to obtain a cementitious material, to which alumite (KAl(SO) was added to the cementitious material. 4 ) 2 .12H 2 O), obtained phosphogypsum-based sludge drying agent, wherein alunite (KAl (SO 4 ) 2 .12H 2 O) accounts for 0.5% of the total mass of the cementitious material. The measured specific surface area of ​​the phosphogypsum is 777.3m 2 / kg.

[0038] This experiment is a sludge drying experiment. The average moisture content of the dehydrated sludge in its original state is 76.0%, and the cementitious material is prepared according to the above ratio. The cementitious material is weighed according to 15% of the total mass of the dewatered sludge, poured into a mortar mixer, mixed evenly and stirred for 3 minutes, and then taken out and dried. The sludge is placed in a sealed container and maintained under the standard curing conditions of temperatu...

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Abstract

The invention relates to a preparation method of a phosphogypsum-based sludge drying agent, comprising the following steps: using phosphogypsum as a basic raw material, adding blast furnace slag, steel slag and a clinker, stirring for 30-45 min to uniformly mix the above materials, and adding a chemical exciting agent to prepare a cementing material which is the phosphogypsum-based sludge drying agent. The phosphogypsum-based sludge drying agent is poured into dewatered sludge, and stirring is carried out for 3-10 min to prepare a mixture. the mixture is placed in a sealed container and is maintained at the temperature of 20 DEG C+ / -1 DEG C and at humidity of being greater than or equal to 95% for 3-14 days, and moisture in the sludge is removed so as to further dry the sludge. The phosphogypsum-based sludge drying agent has advantages of large reduction extent of water content, short drying time and obvious drying effect; raw materials are mainly wastes; cost is low; energy consumption is low; there is no secondary pollution to the environment; and problems such as high water content of municipal sludge, high drying cost and the like can be solved.

Description

technical field [0001] The patent of the present invention relates to a preparation method of a phosphogypsum-based sludge drying agent. The main raw material is phosphogypsum, mixed with slag and clinker, and then an activator is added to obtain a rapid drying dewatered sludge, which can improve the pollution of the sludge. A normal temperature desiccant with the strength of the solidified mud body, and the desiccant is used to remove the moisture in the municipal sewage sludge. Background technique [0002] Phosphogypsum is an industrial by-product of the wet production of phosphoric acid from phosphate rock raw materials. One ton of phosphoric acid produces 5-6t (dry basis) of phosphogypsum, and the physical amount is about 7t. The annual production in the country is about 50 million tons. 200 million tons, all of which are disposed of in the form of slag yard storage, and the land used for various slag yards reaches more than 18,000 mu. Impurities such as acid and fluor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B7/21C02F11/14
CPCY02P40/10
Inventor 黄绪泉
Owner 武汉湖振煜环境科技有限公司
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