TWI687388B - Clean water sludge reproduction-based light-weight pellet material, preparation method and manufacturing system thereof - Google Patents

Abstract

The invention provides a clean water sludge reproduction-based light-weight pellet material, a preparation method and a manufacturing system thereof. The method for manufacturing a clean water sludge reproduction-based light-weight pellet material comprises conducting modification of a clean water sludge with an additive, adding water to be granulated into a green pellet ball in a half-dry state, and further fired through a thermal processing in a rotary kiln, thereby a light-weight pellet material being able to be used in the construction projects is formed.

Description

Water purification sludge reconstituted light weight material, its manufacturing method and its manufacturing system

The invention relates to a water-purified sludge reconstituted light-weight pellet, its production method and its manufacturing system, in particular to a raw slug made of water-purified sludge after being modified by additives and granulated with water into a semi-dry state Then, after heat treatment, it is fired in a rotary kiln to be used for light weight materials in construction projects.

Water purification sludge is the mud cake produced by the processes of concentration, sedimentation, drug coagulation and mechanical pressure filtration in the process of tap water purification. It belongs to the "general business waste" announced by the government. According to statistics from the Taiwan Water Supply Corporation and the Taipei Water Supply Division, the total annual output of domestic purified water sludge is approximately 160,000 metric tons, of which the Taiwan Water Supply Corporation is the largest, with an annual output of approximately 130,000-140,000 metric tons.

Since the water purification sludge belongs to the announced business waste, it cannot be discarded at will. Therefore, the disposal of water purification sludge in domestic water purification plants is mainly for the supplier to reuse, and a small part is buried for disposal. In the recycling method, it is mainly provided as cement raw materials, brick making and cultivation soil.

In recent years, due to the successive completion of major domestic construction projects, it is not easy to obtain natural resources such as clay and shale. As a result, industries such as cement and bricks and shrubs have shrunk, and the demand for clean sludge from laymen has been decreasing. On the other hand, the disposal cost of water purification sludge is relatively low in the past, and the related reuse or reduction technology has not been paid much attention by the industry. Therefore, how to effectively decontaminate water purification sludge and enhance its reuse value has become an urgent task.

The chemical composition requirements of raw materials suitable for making light-weight pellets can be divided into 3 points:

1. Main ingredients of pottery

The main components of pottery (glassy) are SiO ₂ , Al ₂ O ₃ and Fe2O ₃ , accounting for about 3/4 of the raw materials, which form a glassy melt at high temperature. When the content is too low, it affects the smoothness and strength of the pellet casing; when the content is too high, the melting point is high, the viscosity is large, and the expansibility is poor.

2. Flux oxide

There are mainly Na ₂ O, K ₂ O, CaO, MgO and FeO, etc. These substances can play the role of flux to reduce the temperature of the melt, they will also directly affect the softening temperature range and the roasting temperature range of the material, so that the pellets Expansion performance is reduced.

3. Gaseous substances

The gas-generating substance is an important substance that generates H ₂ O, O ₂ , CO ₂ , SO ₂ , CO, N ₂ and H ₂ and other gases through reductive decomposition and interaction at high temperature, which can make the light-weight material foam The power to expand to form internal pores is also a key factor in controlling the product characteristics (ie, particle density) of the lightweight pellets.

Basically, the chemical composition of the water purification sludge meets the two requirements of "main ingredients for pottery formation" and "flux oxide", and also falls on the three-phase diagram of the chemical composition of the suitable melt viscosity recommended by CM Riley. As shown in Figure 1, it has the potential to make lightweight pellets.

As for how to control the particle density of the light-weight pellets produced by water purification sludge, the additives in this patent are used as gas generating substances. This results in a particle density of 1.1 g/cm ³ to 1.6 g/cm ₃ for structural engineering; and a particle density of 0.6 g/cm ³ to 1.0 g/cm ³ for non-structural engineering. The types and temperatures of gases generated by other additives are shown in Table 1. The main components of the modification additives are selected from the group consisting of silicon carbide (SiC), sulfates (SO ₄ ^2- ) and alcohols (R-OH).

Table 1

In order to achieve the above object, the present invention provides a method for preparing water-purified sludge to regenerate light-weight pellets, which includes: a masterbatch mixture preparation step: putting dried water-purified sludge and additives into a mixing unit, and then Add water and mix to form a masterbatch mixture with a moisture content in the range of 15% to 35%; granulation step: put the masterbatch mixture into the granulation unit to make a raw material ball with a particle size distribution in the range of 5 to 20 mm And the firing step: the raw material ball is transported to the firing unit for low-temperature stage firing and high-temperature stage firing in order to obtain light-weight pellets.

According to an embodiment of the present invention, the weight ratio of the purified water sludge to the additive is in the range of 92 wt%: 8 wt% to 83 wt%: 17 wt%;

According to an embodiment of the present invention, the additive is at least one selected from silicon carbide (SiC), sulfates (SO ₄ ^2- ), alcohols (R-OH), and combinations thereof;

According to an embodiment of the present invention, the conditions of the low-temperature firing are: raising the temperature from the first temperature (T1) to the second temperature (T2) in a first predetermined time interval (t1), and the rotation speed is at 1 The range of ~6rpm; the conditions of the high-temperature firing are: the second predetermined time interval (t2), the temperature is raised from the third temperature (T3) to the fourth temperature (T4), and the rotation speed is between 1~4rpm range. In addition, according to an embodiment of the present invention, firing in the low temperature stage further includes holding at the second temperature (T2) for X minutes; and firing in the high temperature stage further includes maintaining at the fourth temperature (T4) for Y minute. Moreover, X, and Y are not particularly limited, and the two may be the same or different; for example, X, and Y may be in the range of 5 to 30, preferably 5 to 28 The better range is 5 to 25, and the best range is 5 to 22. Furthermore, t1, t2, T1, T2, T3, and T4 meet the following relationship: 10 min≦t1≦50 min, 15 min≦t2≦60 min, and 0.16≦t1/t2≦3.33; 40℃≦T1≦700℃, 40℃≦T2≦700℃, and T1≦T2; 600℃≦T3≦1250℃, 600℃≦T4≦1250℃, and T3≦T4.

According to an embodiment of the present invention, the first predetermined time interval (t1) and the second predetermined time interval (t2) may be the same or different, and are not particularly limited. For example, for example, the lower limit of t1 is preferably greater than or equal to 10 min, more preferably equal to or greater than 11 min, and the best is greater than or equal to 12 min; on the other hand, the lower limit of t2 is preferably greater than or equal to 15 min, more The best is 16 minutes or more, and the best is 17 minutes or more.

Secondly, according to an embodiment of the present invention, the upper limit of the first predetermined time interval (t1) is preferably 50 minutes or less, more preferably 49 minutes or less, and most preferably 48 minutes or less; on the other hand, The upper limit of the second predetermined time interval (t2) is preferably 60 minutes or less, more preferably 59 minutes or less, and most preferably 58 minutes or less.

Furthermore, according to an embodiment of the present invention, the first predetermined time interval (t1) and the second predetermined time interval (t2) are not particularly limited. For example, for example, the first predetermined time interval (t1) and the second predetermined time interval (t2) should preferably satisfy the relationship of 0.16≦t1/t2≦3.33, preferably 0.16≦t1/t2≦3.3 The relational expression is more preferably a relational expression satisfying 0.16≦t1/t2≦3.25, and the best is a relational expression satisfying 0.16≦t1/t2≦3.20.

According to an embodiment of the present invention, the first temperature (T1) and the second temperature (T2) in the low temperature stage are not particularly limited, and the two may be the same or different. For example, for example, the first temperature (T1) is preferably in the range of 40°C to 700°C, preferably in the range of 40°C to 690°C, more preferably in the range of 40°C to 680°C, and most The preferred range is 40°C to 670°C. On the other hand, the second temperature (T2) is preferably in the range of 40°C to 700°C, preferably in the range of 40°C to 690°C, more preferably in the range of 40°C to 680°C, most preferably It is in the range of 40°C to 670°C. In addition, the temperature difference between the first temperature (T1) and the second temperature (T2) is not particularly limited. For example, for example, the value of (T2-T1) may be above 50°C, preferably 100 ℃, the better is above 150 ℃, the best is above 200 ℃.

According to an embodiment of the present invention, the third temperature (T3) and the fourth temperature (T4) in the high temperature stage are not particularly limited, and the two may be the same or different. For example, for example, the third temperature (T3) is preferably in the range of 600°C to 1250°C, preferably in the range of 600°C to 1240°C, more preferably in the range of 600°C to 1230°C, most preferably The range is 600°C to 1220°C. On the other hand, the fourth temperature (T4) is preferably in the range of 600°C to 1250°C, preferably in the range of 600°C to 1240°C, more preferably in the range of 600°C to 1230°C, and most preferably In the range of 600 ℃ to 1220 ℃. In addition, the temperature difference between the third temperature (T3) and the fourth temperature (T4) is not particularly limited. For example, for example, the value of (T4-T3) may be above 50°C, preferably 100 ℃, the better is above 150 ℃, the best is above 200 ℃.

According to an embodiment of the present invention, the weight ratio of the purified water sludge to the additive is in the range of 92 wt%: 8 wt% to 83 wt%: 17 wt%. Moreover, the weight of the purified water sludge relative to the additive is preferably in the range of 92 wt%: 8 wt% to 84 wt%: 16 wt%; more preferably, it is in the range of 92 wt%: 8 wt% to 85 wt %: the range of 15 wt%; the best is in the range of 92 wt%: 8 wt%~86 wt%: 14 wt%.

According to an embodiment of the present invention, the particle density of the light weight pellet is in the range of 0.3 g/cm ³ to 1.8 g/cm ³ . For example, for example, the particle density of the light pellet is in the range of 1.1 g/cm ³ to 1.6 g/cm ³ , or the particle density of the light pellet is in the range of 0.6 g/cm ³ to 1.0 g/ The range of cm ³ .

According to an embodiment of the present invention, after the firing step, a cooling step is further included: the light-weight pellet obtained in the firing step is cooled and annealed.

The method for reclaiming light pellets from water purification sludge as described in any one of claims 1 to 3, wherein the water purification sludge and the additive are powders with a median diameter D ₅₀ ≦50 microns (μm) .

In addition, the present invention can also provide a system for manufacturing light weight sludge from purified water sludge, which at least includes: a grinding unit for grinding dry purified water sludge and/or additives into powder; mixing A unit for mixing the purified water sludge, the additive and water to form a masterbatch mixture; a granulation unit is provided at the downstream end of the mixing unit to receive the The masterbatch mixture is pelletized to form a raw meal ball; and a firing unit, which includes at least a double-cylinder rotary kiln and a monitoring device; wherein the double-cylinder rotary kiln is composed of a drying preheating kiln and a roasting kiln for insertion It is formed in series, and the drying preheating kiln and the roasting kiln are independently provided with a temperature adjusting mechanism and a rotating speed adjusting mechanism; the inlet of the drying preheating kiln is set at the downstream end of the granulation unit. To receive the raw pellets from the granulation unit and perform low-temperature firing; the roasting kiln receives the raw pellets from the drying and preheating kiln and perform high-temperature firing to obtain light pellets; the monitoring The device is electrically connected with the temperature adjustment mechanisms and the rotation speed adjustment mechanisms to detect and control the temperature and rotation speed in the drying preheating kiln and the roasting kiln.

According to an embodiment of the present invention, the manufacturing system of the purified sludge to regenerate the light weight material further includes a cooling unit disposed at the downstream end of the firing unit for cooling the light weight material.

The specific effects that can be achieved by the present invention include:

1. In the present invention, the purified water sludge is made into a light-weight material by using a rotary kiln process.

2. The present invention uses additives to control the product characteristics (ie, particle density) of light-weight pellets, so that it can be used in applications such as "structural engineering" and "non-structural engineering."

In the following, different specific embodiments are listed and described in detail for the implementation of the present invention, so as to make the spirit and content of the present invention more complete and easy to understand; however, those with ordinary knowledge in this skill should understand The present invention is of course not limited to these examples, and other identical or equal functions and sequence of steps can be used to achieve the invention.

In this document, the meanings of the scientific and technical words used herein are the same as those understood and used by those with ordinary knowledge in the technical field to which the present invention belongs. In addition, without conflicting with the context, the singular noun used in this specification covers the plural form of the noun; and the plural noun used also covers the singular form of the noun.

In this article, the values and parameters used to define the scope of the present invention inevitably contain the standard deviation due to individual test methods, so most of them are expressed by approximate numerical values, but in specific embodiments Relevant values presented as accurately as possible. In this article, "about" generally depends on the consideration of those with ordinary knowledge in the technical field to which the present invention belongs, and generally means that the actual value falls within the acceptable standard error of the average value, for example, the actual value is Within ±10%, ±5%, ±1%, or ±0.5% of a specific value or range.

In the embodiment of the present invention, water purification sludge and additives are used as the raw materials of the light weight pellets; the water purification sludge can be the sludge produced after the tap water purification treatment, and the additive has gas generation The main effect of the substance is selected from the combination of silicon carbide (SiC), sulfates (SO ₄ ^2- ) and alcohols (R-OH). The sulfates can be any of magnesium sulfate, sodium sulfate, potassium sulfate, calcium sulfate, and barium sulfate; the alcohols are methanol, ethanol, isopropanol, n-butanol, amyl alcohol, ethylene glycol, and propylene Any of the triols.

Next, please refer to Figure 2, the preferred implementation of the present invention includes the following steps:

Masterbatch mixture preparation step S1: Put the dried purified water sludge and additives into the mixing unit, and then add water to mix to form a masterbatch mixture with a moisture content ranging from 15% to 35%.

Granulation step S2: The master batch mixture is put into a granulation unit to make a raw material ball with a particle size distribution in the range of 5-20 mm.

Firing step S3: The raw material ball is transported to the firing unit for low-temperature stage firing and high-temperature stage firing in order to obtain light-weight pellets.

According to another embodiment of the present invention, before the masterbatch mixture preparation step S1, it may further include a raw material pretreatment step P1: drying the purified water sludge and additives separately to a constant weight, preferably Yes, the purified water sludge and additives are transported to the dryer through the scraper, and the temperature of the dryer is between 95~105℃. Then, the dried water purification sludge and additives are crushed into blocks; preferably, they are crushed into blocks by using a jaw crusher; the crushed water purification sludge and additives are finely ground into powder, They are separately stored in the silos to which they belong; preferably, they are finely ground into a powder with a median particle diameter D ₅₀ ≦50 microns (μm) using a ball mill.

Through the above raw material pretreatment step P1 of the homogenization treatment such as drying, crushing and grinding, the raw material is made into a homogeneous powder, which can be uniformly mixed in the subsequent master batch mixture preparation step S1 to ensure It can produce light-weight pellets with stable quality and excellent performance;

In the preparation step S1 of the master batch mixture, the purified water sludge and additives after grinding are measured at an appropriate ratio, and then water is added to form a mixture with a moisture content of 15% to 25%.

The masterbatch mixture can be formulated with 2 groups of formulas. The first group is for structural engineering. The chemical composition of the purified water sludge falls within the CMRiley three-phase diagram, and the additive accounts for 3% of the dry weight of the mixture. 8%. This results in a light weight pellet with a particle density of 1.1 g/cm ³ to 1.6 g/cm ³ for "structural engineering".

The second group is that the chemical content of the purified water sludge falls within the CMRiley three-phase diagram, and the additives account for 9%-17% of the dry weight of the mixture. This results in a light weight pellet with a particle density of 0.6 g/cm ³ to 1.0 g/cm ³ for "non-structural engineering".

The procedure of mixing ingredients can be measured according to the above formula, using an electronic scale attached to the conveyor belt to measure the ingredients, and then add water through a two-axis mixer to mix until homogeneous, to be granulated.

Next, in this granulation step S2, the masterbatch mixture is made into a continuous gradation of 5-20 mm spherical raw material balls; preferably, the mixed material after the completion of mixing is transported by a conveyor belt Until the disc granulator is used for granulation, the granulation method adopts the wet balling method to avoid dust flying, and implements environmentally friendly clean production.

The masterbatch mixture transports the raw meal balls to a rotary kiln to burn into light pellets. The highest furnace temperature used for firing is between 1,100 and 1,200°C, and the firing curve is set according to the preset firing curve. The exhaust gas of the kiln must be collected by air pollution control equipment to be treated with dust, so that it meets the national air pollution control standards. The recovered dust obtained by dust collection can also be reused in the production of light weight materials.

Furthermore, the raw material ball is sequentially fired at a low temperature stage and fired at a high temperature stage in a firing unit; the conditions for the firing at a low temperature stage are: in a first predetermined time interval (t1), the temperature is The first temperature (T1) is increased to the second temperature (T2), and the rotation speed is in the range of 1 to 6 rpm; the firing conditions at this high temperature stage are: the temperature is changed from the third temperature to the second predetermined time interval (t2) (T3) The temperature is increased to the fourth temperature (T4), and the rotation speed is in the range of 1 to 4 rpm; and t1, t2, T1, T2, T3, and T4 comply with the following relationship: 10 min≦t1≦50 min, 15 min≦t2≦60 min, and 0.16≦t1/t2≦3.33; 40℃≦T1≦700℃, 40℃≦T2≦700℃, and T1≦T2; 600℃≦T3≦1250℃, 600℃≦T4≦1250℃, and T3≦T4.

In addition, in another embodiment of the present invention, after the firing step S3, a cooling step S4 is further included: the fired light pellets are cooled and annealed; preferably, the light pellets are Use a chiller to cool and anneal according to the pre-set cold curve; in addition, after the cooling step S5, it may further include a screening and grading step S6: the light-weight pellets obtained by cooling, according to their unit weight and particle size, etc. For classification and storage, the light-weight materials must also meet the National Standards of the Republic of China (CNS) specified by the country before they leave the factory, and then become finished products that can be sold out of the factory.

Corresponding to the manufacturing method of the water purification sludge reconstituted light weight material of the present invention, the present invention provides a manufacturing system of water purified sludge reconstituted light weight material, which includes a drying unit 1, a grinding unit 2, and a mixing unit 3. Granulation unit 4 and firing unit 5.

The drying unit 1 is used to dry the purified water sludge and additives to a constant weight, and the drying temperature may be between 95~105°C.

The grinding unit 2 receives the dried water purification sludge and grinds the water purification sludge. The grinding unit 2 includes a crushing unit 21 and a grinding unit 22. The crushing unit 21 is used to separate the dried water purification sludge and The additives are crushed into blocks separately. In this embodiment, the crushing unit 21 may be a jaw crusher, and the grinding unit 22 is used to finely grind the crushed purified water sludge and additives into powders and store them in their respective In this embodiment, the grinding unit 22 may be a ball mill, which finely grinds the crushed fly ash mixture into a powder with a median diameter D ₅₀ ≦50 microns (μm).

The mixing unit 3 is used to mix the purified water sludge and additives to form a masterbatch mixture, measure and pulverize the purified water sludge and additives according to an appropriate ratio, and then add water to mix to form a moisture content of 15% ~25% of the mixture.

As mentioned above, the mixture can have 2 groups of formula design. The first group is for structural engineering. The chemical composition of the purified water sludge falls within the CMRiley three-phase diagram, and the additive accounts for the dry weight percentage of the mixture. 3%-8%. This results in a light weight pellet with a particle density of 1.1 g/cm ³ to 1.6 g/cm ³ for "structural engineering".

The second group is that the chemical content of the purified water sludge falls within the CMRiley three-phase diagram, and the additives account for 9%-17% of the dry weight of the mixture. This results in a light weight pellet with a particle density of 0.6 g/cm ³ to 1.0 g/cm ³ for "non-structural engineering".

The granulation unit 4 is provided at the downstream end of the mixing unit 3 to receive the masterbatch mixture from the mixing unit 3 and granulate to form raw pellets. The granulation unit 4 includes a granulator, and the granulator receives the masterbatch The mixture is formed into granules with a particle size of 5-20 mm by wet balling.

The firing unit 5 includes at least a double-barrel rotary kiln 51 and a monitoring device 52; wherein the double-barrel rotary kiln 51 is formed by a drying preheating kiln 511 and a roasting kiln 512 connected in series, and drying and preheating The kiln 511 and the roasting kiln 512 are independently provided with a temperature adjustment mechanism and a rotation speed adjustment mechanism. The feed inlet of the drying and preheating kiln 511 is provided at the downstream end of the granulation unit 4 to receive the raw material balls from the granulation unit 4 and perform the first-stage firing. The roasting kiln 512 receives the raw material pellets from the drying and preheating kiln 511 and performs the second stage firing at a temperature range of 1100-1200°C, thereby obtaining light pellets. The monitoring device 52 is electrically connected to the temperature adjustment mechanism and the rotation speed adjustment mechanism to detect and control the temperature and rotation speed in the drying preheating kiln 511 and the roasting kiln 512.

The double-cylinder rotary kiln 51 may be further provided with an angle adjustment mechanism, which is electrically connected to the monitoring device to adjust the inclination angle of the double-cylinder rotary kiln.

In addition, the drying and preheating kiln 511 and the roasting kiln 512 can be respectively provided with gas regulating mechanisms, which are electrically connected to the monitoring device 52 to detect and adjust the gas in the drying and preheating kiln 511 and the roasting kiln 512 Composition ratio.

In addition, the double-tube rotary kiln 51 of the present invention further includes a temperature sensor and an angle sensor. The temperature sensor senses the temperature of the drying preheating kiln 511 and the roasting kiln 512 and transmits it to the monitoring device 52. , The angle sensor detects the rotation angle of the drying preheating kiln 511 and the roasting kiln 512 and transmits it to the monitoring device 52. The monitoring device 52 controls the heater of the double-tube rotary kiln 51 according to the set temperature curve and the detected temperature The heating temperature of the monitoring device 52 further includes a control panel. The control panel is provided with a plurality of control buttons and numerical input buttons to set the temperature curve and the predetermined rotation angle. The control panel is also provided with a display device for displaying The temperature and angle of the drying preheating kiln 511 and the roasting kiln 512. In addition, the monitoring device 52 further includes a wireless transceiver unit, which can be connected to a remote controller or a portable device via a wireless network, and an operation interface can be installed on the remote controller or the portable device, and the user can remotely Use a remote control or a portable device to send control signals to the monitoring device 52, and monitor the status of the double-tube rotary kiln 51.

The light-weight pellets after firing are transported to the cooling unit 6, the cooling unit 6 is provided at the downstream end of the firing unit 5 for cooling the light-weight pellets, and the light-weight pellets after firing are cooled and annealed; preferably What's more, the light weight pellets are cooled and annealed according to the pre-set chill curve using a cooler.

The cooled light-weight pellets are transported to a screening unit 7 and sorted and stored according to their unit weight and particle size.

In addition, the manufacturing system of high-performance sludge recycled light pellets further includes a system information control center 8, which is connected to the mixing unit 1, filter press unit 2, drying unit 3, granulation unit 4, burning Manufacturing unit 5, cooling unit 6 and screening unit 7, and the system information control center 8 is connected to a cloud database 9 via a network, mixing unit 1, filter unit 2, drying unit 3, granulation unit 4, The manufacturing parameters of the firing unit 5, the cooling unit 6, and the screening unit 7 can be sent to the system information control center 8, and the system information control center 8 can be sent to the control signal to the mixing unit 1, filter press unit 2, drying unit 3 , Granulation unit 4, firing unit 5, cooling unit 6 and screening unit 7, cloud database 9 can analyze the data of each unit and provide the best control mode of the system information control center 8.

Next, the following describes the method for preparing light pellets by using purified water sludge of the present invention with specific examples, and analyzes the properties such as water absorption rate, particle density, and strength. "Example 1-2"

In Examples 1 and 2, water purification sludge, silicon carbide, sulfates, and alcohols were dried, crushed, and pulverized in the ratios shown in Table 2 below, and then added with fresh water and mixed to obtain the mother Material mixture, the water content in the masterbatch mixture is between 15% and 25%.

The master batch mixture is transported to a disc granulator by a conveyor belt for granulation, and a continuous gradation of 5-15 mm lumpy raw material balls is made.

Then, the raw material pellets were put into a double-tube rotary kiln at a temperature, temperature rise time, and rotation speed as shown in Table 2 to perform low-temperature stage firing and high-temperature stage firing in order to obtain light pellets M1 and M2.

After cooling and annealing the light-weight pellets M1 and M2, product physical properties were analyzed, and the obtained results are recorded in Table 2.

Table 2

It can be seen from the results in Table 2 that the bulk weights of the light weight pellets S1 and S2 prepared in Example 1 and Example 2 of the present invention are 550-800 kg/m ³ and 300-400 kg/m ^{3 respectively} , and the particle density 1.1~1.6g/cm ³ and 0.6~1.0g/cm ³ respectively, the water absorption rate is 10~15% and 12~18% respectively, the cylinder pressure strength is 5~8 Mpa and <3 Mpa, It is suitable as a material for construction projects or horticultural plants.

In summary, the preferred embodiment of the present invention can effectively reuse the light-weight pellets. However, the above implementation description, drawings and tables show that it is one of the preferred embodiments of the present invention, which does not limit the present invention in this way, so that it is similar to and similar to the structure, device, and characteristics of the present invention. All of them should be within the scope of the invention and the scope of patent application.

P1, S1~S5: Step 1: Drying unit 2: Grinding unit 3: mixing unit 4: Granulation unit 5: firing unit 6: Cooling unit 7: Screening unit 8: System Information Control Center 9: Cloud database 21: Crushing unit 22: Grinding unit 51: Double barrel rotary kiln 52: Monitoring device 511: Drying preheating kiln 512: Roasting kiln

Figure 1 is a three-phase diagram showing the suitable melt viscosity of C. M. Riley. FIG. 2 is a flow chart showing a preferred embodiment of a method for manufacturing light weight pellets from purified water sludge of the present invention. FIG. 3 is a system block diagram showing an embodiment of a system for manufacturing light weight sludge from water purification sludge of the present invention.

P1, S1~S5: Step

Claims (10)

A method for preparing light pellets from purified water sludge, which includes: Masterbatch mixture preparation step: Put dried purified water sludge and additives into a mixing unit, and then add water to mix to form a moisture content of 15%~ Masterbatch mixture in the range of 35%; granulation step: putting the masterbatch mixture into the granulation unit to make a raw material ball with a particle size distribution in the range of 5-20 mm; and firing step: mixing the raw material The balls are transported to the firing unit for low-temperature stage firing and high-temperature stage firing in order to obtain light pellets; wherein the weight ratio of the purified water sludge to the additive is 92 wt%: 8 wt% ~83 wt%: 17 wt%; the additive is at least one selected from silicon carbide (SiC), sulfates (SO ₄ ^2- ), alcohols (R-OH), and combinations thereof; the The conditions for firing in the low temperature stage are: raising the temperature from the first temperature (T1) to the second temperature (T2) in the first predetermined time interval (t1), and the rotation speed is in the range of 1 to 6 rpm; The conditions for the control are: raising the temperature from the third temperature (T3) to the fourth temperature (T4) in the second predetermined time interval (t2), and the rotation speed is in the range of 1 to 4 rpm; and t1, t2, T1 T2, T3, and T4 respectively meet the following relationship: 10 min≦t1≦50 min, 15 min≦t2≦60 min, and 0.16≦t1/t2≦3.33; 40℃≦T1≦700℃, 40℃≦T2≦700 ℃, and T1≦T2; 600℃≦T3≦1250℃, 600℃≦T4≦1250℃, and T3≦T4. As described in claim 1, the method for producing light weight pellets from purified water sludge, wherein the content of the additive is less than 20wt%. The method for producing light-weight pellets from purified water sludge as described in claim 1, wherein the particle density of the light-weight pellets is in the range of 0.3 g/cm ³ to 1.8 g/cm ³ . The method for producing light pellets from purified water sludge as described in any one of claims 1 to 3, wherein after the firing step, a cooling step is further included: the light pellets obtained in the firing step It is cooled and annealed. The method for producing light-weight pellets of purified water sludge as described in any one of claims 1 to 3, wherein the purified water sludge and the additive are powders with a median diameter D ₅₀ ≦50 microns (μm) body. A system for manufacturing light pellets from water purification sludge, which at least includes: Grinding unit for grinding dry water purification sludge and/or additives into powder; The mixing unit is used to mix the purified water sludge, the additive and water to form a masterbatch mixture; A granulation unit, which is provided at the downstream end of the mixing unit, for receiving the masterbatch mixture from the mixing unit and granulating to form a green pellet; and The firing unit, which contains at least a double-tube rotary kiln and a monitoring device; The double-cylinder rotary kiln is composed of a drying preheating kiln and a roasting kiln connected in series, and the drying preheating kiln and the roasting kiln are independently provided with a temperature adjusting mechanism and a rotating speed adjusting mechanism; The feed inlet of the intervention heat kiln is provided at the downstream end of the granulation unit to receive the raw material balls from the granulation unit and perform low-temperature firing; the roasting kiln receives the raw material from the drying preheat kiln Raw material pellets are fired at high temperature to obtain light pellets; The monitoring device is electrically connected to the temperature adjustment mechanisms and the rotation speed adjustment mechanisms to detect and control the temperature and rotation speed in the drying preheating kiln and the roasting kiln. As described in claim 6, the system for producing light weight sludge from purified water sludge, wherein the double-cylinder rotary kiln is further provided with an angle adjustment mechanism, the angle adjustment mechanism is electrically connected to the monitoring device to adjust the double The inclination angle of the drum rotary kiln, and the drying preheating kiln and the roasting kiln are respectively provided with gas regulating mechanisms. The gas regulating mechanisms are electrically connected to the monitoring device to detect and adjust the drying preheating The gas composition ratio of the kiln and the roasting kiln. The manufacturing system for reclaiming light weight sludge from purified water sludge as described in claim 6 further includes a cooling unit provided at the downstream end of the firing unit for cooling the light weight pellet. A water-repellent sludge reconstituted light pellet material, characterized in that the water-purified sludge reconstituted light pellet material utilizes the production method according to any one of claims 1 to 5, or utilizes any one of claims 6 to 8 manufacturing system according to the prepared, purification sludge and the pellet reconstituted light intensity based cylinder pressure less than or equal 3Mpa, or particle density in the range of 0.3 ~ 1.8g / cm ³ of. As claimed in claim 9, the water purification sludge is used to prepare light pellets, wherein the water purification sludge is used to prepare light pellets, which is suitable for horticultural planting.

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