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A kind of multifunctional ceramsite with the ability to supply alkali and release calcium, preparation method and application thereof

A multifunctional technology for calcium release from alkali, applied in the field of multifunctional ceramsite and its preparation, can solve problems such as secondary pollution, and achieve the effects of high utilization rate, good effect and low price

Active Publication Date: 2017-07-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutralization precipitation method is one of the most common and simplest methods for treating wastewater containing phosphorus or copper ions. It adjusts the pH value of the wastewater to the range where the phosphate and copper ions have the minimum solubility by adding alkaline agents, so that It settles down, but the sludge produced by this method will cause secondary pollution problems

Method used

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  • A kind of multifunctional ceramsite with the ability to supply alkali and release calcium, preparation method and application thereof
  • A kind of multifunctional ceramsite with the ability to supply alkali and release calcium, preparation method and application thereof
  • A kind of multifunctional ceramsite with the ability to supply alkali and release calcium, preparation method and application thereof

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preparation example Construction

[0021] The preparation and application process of the present invention are further illustrated below in conjunction with examples.

[0022] The principle of the present invention is: (1) obtaining the porosity of ceramsite. Calcium carbonate in papermaking lime mud is decomposed by heat at around 800°C, as shown in formula (a), producing a large amount of CO 2 The gas escapes continuously, forming connected pores in the range of 5-15 μm inside the ceramsite, and the organic wood chips in the raw material are burned out during the calcination process to form large pores in the range of 100-200 μm in the ceramsite. The pore size in the ceramsite is Bimodal distribution. (2) Low-temperature calcination mechanism of ceramsite. The mixture of raw materials such as papermaking lime mud and fly ash belongs to CaO-Al 2 o 3 -SiO 2 system, after calcination at 950-1100°C, anorthite (CaAl 2 Si 2 o 8 ), calcium aluminate feldspar (Ca 2 Al 2 SiO 7 ), wollastonite (CaSiO 3 ) an...

Embodiment 1

[0034] Example 1: Combining figure 1 , the preparation and application of a kind of multifunctional ceramsite with the ability to release calcium for alkali in the present invention are as follows:

[0035] The ground raw materials are weighed and stirred according to the mass percentage of papermaking white mud: fly ash: wood chips: kaolin = 36:53:10:1, and the water-solid ratio is 0.1; put the evenly stirred mixture into a ball Granulate in a pan to make pellets with a particle size of 2-5 mm; place the pellets at room temperature for 24 hours for natural curing; put the pellets after natural curing in a preheating kiln for drying; dry the pellets after drying The balls are put into the roasting kiln for calcination. The calcination temperature is 1100°C. The heating rate is first raised from room temperature to 800°C at 10°C / min, and then continued to rise to 1100°C at 5°C / min after holding for 1 hour, and the heat preservation rate is 0.5°C. Cool in the furnace after 1 ho...

Embodiment 2

[0037] Example 2: Combining figure 1 , the preparation and application of a kind of multifunctional ceramsite with the ability to release calcium for alkali in the present invention are as follows:

[0038] The ground raw materials are weighed according to the mass percentage of papermaking white mud: fly ash: wood chips: kaolin = 42:44:7:7, and the water-solid ratio is 0.07; put the evenly stirred mixture into a ball Granulate in a pan to make pellets with a particle size of 2-5 mm; place the pellets at room temperature for 24 hours for natural curing; put the pellets after natural curing in a preheating kiln for drying; dry the pellets after drying The balls are put into the roasting kiln for calcination, the calcination temperature is 1050°C, the heating rate is first raised from room temperature to 800°C at 10°C / min, and then continued to rise to 1050°C at 5°C / min after holding for 1 hour. Cool in the furnace after 1 hour.

[0039] The bulk density of the ceramsite is 64...

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Abstract

The present invention discloses a multifunctional ceramsite with capabilities of supplying base and releasing calcium and a preparation method thereof. The ceramsite is prepared by the following steps: papermaking white mud, fly ash, sawdust, and kaolin are mixed at a mass percentage ratio of (36-55) : (24-53) : (1-10) : (1-20), water is added into the mixture at a water to solid ratio of 0.02-0.10, and the mixture is granulated to the desired particle size, and the particle is subjected to a nature conservation and drying, and finally is calcined to obtain the finished products. The method is readily available in raw materials, is simple in preparation process, is low in production cost, is high in yield, and effectively solves the papermaking white mud resource recycling problem. The prepared ceramsite has characteristics of supplying base, releasing calcium, and being porous, can sustainably and efficiently adsorb to remove phosphorus and copper, and is suitable to be used in the treatment systems of municipal sewage and industrial wastewater.

Description

technical field [0001] The invention relates to a multifunctional ceramsite which has the ability to supply alkali and release calcium and has a chemical adsorption effect on phosphate and copper ions in water bodies and a preparation method thereof, and belongs to the technical field of resource utilization of inorganic solid waste and water treatment of environmental engineering . Background technique [0002] During the causticization reaction in the alkali recovery process of paper mills, a large amount of by-products - papermaking lime mud will be produced. Its composition is calcium carbonate CaCO 3 Mainly, with a small amount of calcium hydroxide Ca(OH) 2 And undigested lime CaO, as well as trace amounts of potassium, sodium, silicon, iron, manganese and other mineral elements introduced due to different raw materials, have a high water content and a pH value of 9.7-13.5, so they are classified as toxic industrial waste. It is estimated that 1 ton of pulp can produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/08C04B18/26C04B14/10
CPCY02W30/91
Inventor 秦娟崔晓昱崔崇张士华孙巍巍
Owner NANJING UNIV OF SCI & TECH
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