CN105036709A - Preparation method for firing light tourmaline ceramsite through sewage sludge and pulverized fuel ash - Google Patents

Abstract

A preparation method for burning light tourmaline ceramsite by using sewage sludge and fly ash, 1, drying tourmaline, sewage sludge and fly ash; 2, drying the dried tourmaline, sewage sludge and Fly ash is crushed separately; 3. Mix crushed tourmaline particles, sewage sludge particles and fly ash particles to obtain dry mixture; 4. Mix additives, water and dry mixture and extrude to obtain ceramsite embryo body ; 5. Put the ceramsite embryo body into the muffle furnace for sintering to complete. The present invention uses sewage sludge and fly ash as raw materials, not only realizes the resource utilization of sludge and fly ash, overcomes the disadvantage of high cost of preparing ceramsite, but also effectively prevents secondary pollution; the addition of tourmaline The bio-compatibility of ceramsite is improved, and the sewage treatment efficiency of ceramsite is also improved.

Description

A preparation method for burning light tourmaline ceramsite by using sewage sludge and fly ash

technical field

The invention discloses a preparation method for burning light tourmaline ceramsite by utilizing sewage sludge and fly ash.

Background technique

Nowadays, due to the increase of urban population and the development of industry, the amount of urban sewage treatment is also increasing rapidly. At the same time, the amount of sludge generated in the process of sewage treatment is also increasing rapidly, which also increases the cost of sludge treatment, while sewage The sludge treatment technology is not yet mature, and many enterprises adopt the method of landfill accumulation, which has brought secondary pollution to the environment. Therefore, the treatment of sewage sludge is still one of the environmental problems to be solved. At present, the scale of thermal power plants is gradually increasing with the increase of people's demand for electricity. Fly ash, as a production waste, contains a large amount of sulfide, which causes great harm to the environment. Therefore, how to dispose of these sewage sludge and fly ash, which are likely to cause environmental pollution, and their resource utilization are currently a hot spot. In recent years, tourmaline, as a new type of environmentally friendly material, has gradually entered the field of sewage treatment. It has the characteristics of permanent spontaneous polarization, emitting far infrared and releasing negative ions, so it can achieve a good water purification effect, so it is used in water treatment. The research of tourmaline materials in the field is very important.

At present, the use of sewage sludge or fly ash for materialization, such as making concrete fillers, making bricks, and making ceramsite, has achieved some research results at home and abroad, but there are shortcomings, that is, almost all the sludge used to make ceramsite Basically, sludge or fly ash is used as one of the raw material additives, and their usage rate is not very high; and even if there is sintered ceramsite, there are problems such as high density and water absorption. The research on the materialization of tourmaline has achieved some results at home and abroad, but the preparation process of tourmaline ceramsite has not been perfected, and the fired ceramsite has a high density, and the specific surface area and pore volume are small, which seriously affects the quality of ceramsite. This not only restricts the application of ceramsite products, but also seriously limits the development of ceramsite production enterprises.

Contents of the invention

The purpose of the present invention is to prepare a cheap and high-efficiency biological ceramsite filter material. In this process, the purification ability of tourmaline is used to solve the problem of sludge treatment and the resource utilization of fly ash; A preparation method for burning light tourmaline ceramsite from sewage sludge and fly ash.

The present invention is achieved like this: prepare according to the following steps,

1. Dry tourmaline, sewage sludge and fly ash in a drying oven at 105°C for 20 minutes to make the moisture content 30% to 40%;

2. Separately crush and sieve the dried tourmaline, sewage sludge and fly ash to make the broken particles ≤ 100 μm, and then store the tourmaline particles, sewage sludge particles and fly ash particles respectively;

3. Perform X-ray fluorescence analysis (XRF) on the treated tourmaline particles, sewage sludge particles and fly ash particles to obtain their respective component ratios;

Four, determine that tourmaline particle, sewage sludge particle and fly ash particle mix by mass percent 30%:40%:30% according to the composition ratio that last step obtains, obtain dry mixed material; Wherein SiO _2Content is 35.38% , the Al ₂ O ₃ content is 22.33%, the Fe ₂ O ₃ content is 8.96%, the CaO content is 2.67%, and the MgO content is 0.14%;

5. Add additives, flux and water to the dry mixed material. The additive used above is water glass, and the flux is sodium hydroxide. The addition of water glass and sodium hydroxide is 8% of the total mass of the dry blend. and 25%, add 6-8mL of water per 10g of dry mixture; after stirring, extrude on a granulator to obtain a ceramsite embryo body with a particle size of 6-10mm, and dry it naturally;

6. Put the naturally dried ceramsite body into the muffle furnace, gradually heat up at a rate of 6-15°C/min, heat up to 200°C for 20 minutes, cool to room temperature; then heat up to 400°C for 20 minutes, Cool to room temperature; then raise the temperature to 600°C for 20 minutes, cool to room temperature; finally raise the temperature to 800°C, keep hold for 30 minutes, and naturally cool to room temperature to obtain light ceramsite, which is to complete the burning of light tourmaline with sewage sludge and fly ash Preparation of ceramsite.

The advantage of the present invention is that, using tourmaline, urban sewage sludge, and fly ash from power plants as raw materials, a new idea is proposed for resource utilization of sewage sludge and fly ash; in addition, both are waste, It greatly reduces the cost of producing ceramsite, and at the same time reduces the pollution caused by solid waste such as sewage sludge and river sediment to the surrounding environment, realizes the reuse of resources, and complies with the national advocacy of building a two-oriented society. Environmental benefits, social benefits and economic benefits. The addition of tourmaline raw materials can improve the efficiency of ceramsite sewage treatment, so as to obtain efficient and cheap products.

The main components of the inorganic components in the sewage sludge of the present invention are SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , etc., and the sewage sludge also contains a large amount of organic components, and the organic matter can generate small molecular gases during the high-temperature preparation process Substances such as O ₂ , CO ₂ , CO, etc., are conducive to the formation of porous lightweight ceramsite. Fly ash and tourmaline are rich in inorganic components such as SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , CaO and MgO, which are the main components of ceramsite, which is conducive to the formation of ceramsite with low water absorption.

The light tourmaline ceramsite prepared by using sewage sludge and fly ash fired by the present invention can be used in water treatment engineering; And degree and low specific surface area.

The light tourmaline ceramsite prepared by the present invention is fired with sewage sludge and fly ash. The water absorption rate of the light tourmaline ceramsite is 6.1%, and the particle apparent density is 1753kg/m ³ . Low, moderate particle apparent density, in line with the use of water treatment ceramsite filter material standards.

The tourmaline light ceramsite prepared by using sewage sludge and fly ash fired in the present invention, the measured specific surface area and pore volume data of light tourmaline ceramsite are shown in Table 1, and the average value of the specific surface area is 2.5750×10 ⁴ cm ² /g, the average pore volume is 9.8000×10 ^-3 cm ³ /g, the specific surface area of the clay filter is 2.1415×10 ⁴ cm ² /g, and the pore volume is 8.3429×10 ^-3 cm ³ /g, fully reaching the The use standard of water treatment ceramsite filter material (the specific surface area of water treatment filter material is greater than 0.5×10 ⁴ cm ² /g). The specific surface area and pore volume of lightweight ceramsite are moderate, which is conducive to the attachment of microorganisms as a filter material for sewage treatment, thereby improving the sewage treatment efficiency of the reaction system.

Table 1 Analysis results of tourmaline ceramsite specific surface area and pore volume

sample 1 2 3 4 5 average value Specific surface (10 ⁴ cm ² /g) 2.5799 2.9502 2.0656 2.8980 2.3815 2.5750 Pore volume (10 ^-3 cm ³ /g) 9.2130 9.0480 10.0670 8.8960 8.7840 9.8000

The present invention prepares the tourmaline light ceramsite that utilizes sewage sludge and fly ash to burn, analyzes its effect on the treatment of high ammonia nitrogen sewage, and artificially simulates the denitrification efficiency of high ammonia nitrogen sewage operation SBBR, as shown in Figure 1, analysis It is concluded that when the system operation is stable, the ammonia nitrogen removal rate is 85.35%, and the ammonia nitrogen removal efficiency of general shale ceramsite is stable at 82%, so the tourmaline ceramsite of the present invention has obvious advantages.

In the present invention, the dried tourmaline, sewage sludge and fly ash are respectively crushed and broken, and the particle size d≤100 μm; , The particle size is different and layered to ensure the molding quality of ceramsite products.

The additive used in the present invention is water glass, which is high-concentration industrial use of water glass. The purpose of adding water glass is to increase the viscosity when raw materials are mixed, which is beneficial to the molding of ceramsite embryos; at the same time, it can increase the internal expansion of ceramsite The generation of gas is beneficial to the formation of the porous structure of ceramsite; it can also react with CO ₂ in the air to form Na ₂ CO ₃ and SiO ₂ through chemical action to harden ceramsite, thereby increasing the strength of lightweight ceramsite.

Description of drawings

Figure 1 shows the change of NH ₄ ⁺ -H concentration and removal rate in the influent and effluent water in the SBBR system.

Detailed ways

The present embodiment utilizes sewage sludge, fly ash to burn the preparation method of lightweight tourmaline ceramsite according to the following steps:

1. Dry tourmaline, sewage sludge and fly ash in a drying oven at 105°C for 20 minutes to make the moisture content 30% to 40%;

2. Separately crush the dried tourmaline, sewage sludge and fly ash to make the broken particles ≤ 100 μm, and then store the tourmaline particles, sewage sludge particles and fly ash particles respectively;

3. X-ray fluorescence analysis (XRF) was performed on the treated tourmaline particles, sewage sludge particles and fly ash particles to obtain their respective component ratios; as shown in Table 2.

Table 2XRF Determination of Chemical Composition of Sewage Sludge, Fly Ash and Tourmaline

Four, determine tourmaline granule, sewage sludge granule and fly ash granule mix by mass percentage 30%:40%:30% according to its composition ratio, get dry mix;

5. Add additives and water to the dry mix. The additives used are water glass and sodium hydroxide. The additions of water glass and sodium hydroxide are 8% and 25% of the total mass of the dry mix respectively. Add 6-8mL of water to the mixture. After stirring, it is extruded on a granulator to obtain a ceramsite embryo body with a particle size of 6-10 mm, which is dried naturally;

6. Put the naturally dried ceramsite body into the muffle furnace, gradually heat up at a rate of 6-15°C/min, heat up to 200°C for 20 minutes, cool to room temperature; then heat up to 400°C for 20 minutes, Cool to room temperature; then raise the temperature to 600°C for 20 minutes, cool to room temperature; finally raise the temperature to 800°C, keep hold for 30 minutes, and cool down to room temperature naturally to complete the preparation of light tourmaline ceramsite burnt from sewage sludge and fly ash.

Claims (1)

1. utilize sewage sludge, flyash to burn a preparation method for lightweight tourmalinite haydite, it is characterized in that,

Prepare according to the following steps,

One, by tourmalinite, sewage sludge and flyash dry 20min in 105 DEG C of loft drier, its water ratio 30% ~ 40% is made;

Two, dried tourmalinite, sewage sludge and flyash are carried out respectively fragmentation and sieve making crushed particles≤100 μm, then preserve tourmaline particle, sewage sludge particle and fly ash grain respectively;

Three, tourmaline particle, sewage sludge particle and the fly ash grain after process is carried out x-ray fluorescence analysis (XRF) to measure and obtain their respective component proportionss;

Four, the component proportions determination tourmaline particle obtained according to step 3, sewage sludge particle and fly ash grain by mass percentage 30%:40%:30% mix, and obtain the mixing material done; Wherein SiO ₂content is 35.38%, Al ₂o ₃content is 22.33%, Fe ₂o ₃content is 8.96%, CaO content is 2.67%, and content of MgO is 0.14%;

Five, additive, fusing assistant and water are added in dry mixed material, above-mentioned additive used is water glass, fusing assistant is sodium hydroxide, and the add-on of water glass and sodium hydroxide is respectively 8% and 25% of dry blend total mass, and every 10g dry blend adds the water of 6 ~ 8mL; After stirring, extrusion molding on granulator, obtains the haydite idiosome that particle diameter is 6 ~ 10mm, naturally dries;

Six, the haydite idiosome naturally dried is put into retort furnace, heat up gradually with the heat-up rate of 6 ~ 15 DEG C/min, be warming up to 200 DEG C of insulation 20min, be cooled to room temperature; Then be warming up to 400 DEG C of insulation 20min, be cooled to room temperature; Be warming up to 600 DEG C of insulation 20min again, be cooled to room temperature; Finally be warming up to temperature 800 DEG C, insulation 30min, naturally cools to room temperature and obtains light ceramic, namely completes the preparation that sewage sludge and flyash burn lightweight tourmalinite haydite.