How to use sludge incineration ash? As a "derivative" of sewage treatment, sludge production continues to increase as the amount of sewage treatment increases. At present, the sludge incineration treatment process can achieve harmlessness, reduction, energy recovery, etc. to the greatest extent, and has become one of the mainstream technologies for sludge treatment and disposal. Incineration ash is both polluting and has certain resource characteristics. As a solid waste vertical grinding mill manufacturer, today Guilin Hongcheng will introduce to you the comprehensive utilization of sludge incineration ash.
Depending on the incineration temperature, the bottom ash discharged from the incinerator can be divided into two types: one is the residue discharged from the incinerator below 1000°C, which is called ordinary incineration residue. Generally, iron, glass and other substances can be recycled and used as building materials; The other is the molten residue discharged from the high-temperature incinerator at 1500°C. It is in the form of lumps and is called sintering residue. Due to vitrification, it has the characteristics of high density, high strength, and low heavy metal leaching, and can be used in construction materials, concrete aggregates, road base materials, etc.
(1) Use incineration ash to make lightweight aggregates
The Franklin Institute pilot plant in the United States uses incinerator residue as aggregate for Portland cement concrete and asphalt concrete. The production cost is 4 to 5 US dollars per ton. It is used to lay asphalt pavement on test roads with good results. It is also feasible to use incineration ash to produce concrete blocks. The United States and Canada use waste glass as aggregate when paving asphalt mixed pavements. This composite, often called glass felt, has shown good performance in a large number of test tracks paved in the United States and Canada. For the production of lightweight aggregates, technical feasibility studies must first be conducted to determine the best solution for production. Research included ground incinerators, aggregate formulation studies (i.e. selected amounts of clay added), sintering tests and concrete tests. The addition of clay not only facilitates processing into balls, but also increases the strength of fired ceramics. The Tokyo Industrial Laboratory in Japan has successfully conducted research on using incineration residue as lightweight aggregate, and the product has shown good performance. Research results show that incineration residue can be used as the main raw material for lightweight aggregate in building concrete.
(2) Use incineration ash to make wall tiles and floor tiles
The Tokyo Industrial Laboratory in Japan has conducted extensive research on the use of incineration residues to make wall tiles and floor tiles. The results show that the performance of the fired wall tiles and floor tiles fully meets the requirements of the Japanese national standard JIS A 5209. Floor tiles and exterior wall tiles are generally made of silica, feldspar, waxstone, porcelain stone and clay. Replacing some of these raw materials with waste incineration residues can greatly reduce costs despite a decrease in quality. Tests have shown that bricks can be made from a 1:1 ratio of incineration residue and silica clay. The firing method is: put the proportioning materials into a porcelain ball mold, and all the wet powder passes through a 200-mesh mesh sieve. After one dehydration and drying, add 8% to 10% water, squeeze it into shape with a hydraulic press, and bake it in an electric furnace for 24 hours after drying. Keep warm for 2 hours. The firing temperature is 1000°C, and the product obtained after firing is brown. Guiyang, Xi'an and other places in my country use 80% to 85% of garbage ash, combined with other raw materials, to produce silicic acid steam-cured garbage bricks that meet national standards. Its process only requires one more garbage screening process than ordinary steam-cured bricks, and the price is slightly higher than ordinary steam-cured bricks. However, the demand for building bricks in these areas is greater than the supply, so even if the price of silicic acid steam-cured garbage bricks is slightly higher, they can still be sold.
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How to use sludge incineration ash? High-quality cementitious materials can be obtained from sludge incineration fly ash through chemical methods, which can replace Portland cement, but the cost is high, not only consumes a large amount of water resources, but also easily causes water pollution. Therefore, some researchers have proposed a grinding system and method to improve the activity index of sludge and ash. Through the mechanical activation mechanism, the obtained sludge and ash powder has higher activity and can be used as a high-value gelling material for sewage treatment. Technical support is provided for the resource utilization of marl slag in cement, and the production process is both efficient and energy-saving.
How to use sludge incineration ash? This requires the help of a vertical mill. The process flow is: the sludge and ash raw materials are transported to the vertical mill through the feeding device; the sludge and ash move to the grinding track under the centrifugal force of the vertical mill to form a stable material layer, and are mechanically activated Under the action, the sludge ash powder is obtained; the sludge ash powder that meets the particle size requirements is collected by the air box pulse dust collector and transported to the finished product warehouse.
The production principle of this process is that the sludge and ash raw materials are measured by a sealed weighing scale and then transported to the vertical mill through a screw feeder and a bucket elevator. They move to the grinding track under the centrifugal force generated by the rotating grinding disc. A stable material layer is formed under the action of the distribution device. It is deeply ground and physically activated by the extrusion, shearing and friction multi-dimensional force field of the grinding roller and grinding disc, reducing the average particle size of sludge and slag particles while increasing the The uniformity coefficient of the particles, through the mechanism of mechanical activation, produces higher activated sludge ash powder, which can effectively replace Portland cement.
During the grinding process, the centrifugal fan pneumatically lifts the ground micropowder to the powder selection device for control and processing. Micropowder with a particle size of ≤150 μm is collected by the air box pulse dust collector and transported to the finished product warehouse through a pneumatic conveyor. Particles >150μm are returned to the grinding disc through the coarse powder return hopper to continue grinding. Since the grinding roller and the grinding disc of the vertical mill are not in direct contact during operation, it has a long service life, less wear and no metal impact sound of the ball mill, small vibration, low noise, and low energy consumption. The system adopts a fully sealed design and operates in a negative pressure environment, with no dust and a clean environment. Through the above process, in the process of comprehensive utilization of sludge incineration ash, water consumption and carbon emissions are effectively reduced, which has significant social and economic benefits.
How to use sludge incineration ash? If you have sludge incineration ash utilization and processing needs, want to know about the calcined sludge incineration ash vertical grinding mill, or need to purchase a sludge incineration ash vertical grinding mill, please leave us a message for details.
