Process for preparing thermal insulation rock wool by using household garbage incineration fly ash as raw material

Abstract

The embodiment of the invention discloses a process for preparing thermal insulation rock wool by using household garbage incineration fly ash as a raw material. The process comprises the following steps: washing, dehydrating and drying the household garbage incineration fly ash to obtain dechlorinated fly ash; feeding the dechlorinated fly ash, basalt, slag, dolomite and coke into an oxygen-enriched side blowing furnace for melting to obtain molten slurry; the molten slurry is prepared into rock wool fibers through a centrifugal machine, a binding agent is doped, then compression molding is conducted, and the heat preservation rock wool is prepared. According to the method, potential risks in the hazardous waste disposal industry are eliminated from the source, the problem of environmental pollution is avoided, meanwhile, the heat preservation rock wool product with the performance meeting the GB11835-2016 requirement is prepared, effective utilization of resources is achieved, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The embodiment of the present invention relates to the technical field of waste treatment and recycling, and specifically to a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw material. Background Art

[0002] With the development of economy and the improvement of people's living standards, the per capita garbage output of urban residents has increased year by year. The traditional landfill method not only occupies land resources but also causes serious pollution to the surrounding environment. In order to achieve the goal of reducing, harmless and resourceful garbage and promote sustainable urban development, my country has vigorously promoted the construction of municipal solid waste incineration power generation projects. At the end of 2016, there were 97 municipal solid waste incineration plants in operation in China, with a daily disposal capacity of more than 45,000 tons. But with it comes a large amount of municipal solid waste incineration fly ash (referred to as fly ash) produced after flue gas purification. Fly ash is the bottom ash collected by the flue gas purification system of the municipal solid waste incineration plant and settled at the bottom of the flue and chimney. Fly ash contains strong carcinogenic organic pollutants such as dioxins and heavy metals such as Cr, Cd, and Hg, and is a hazardous waste.

[0003] At present, the main method of fly ash disposal is landfill after solidification and stabilization, but landfill cannot completely solve the pollution problem of fly ash, and the capacity of large and medium-sized urban landfills and hazardous waste landfills across the country is approaching saturation. On the one hand, harmful substances have not been effectively removed, and on the other hand, landfill disposal occupies a large amount of land resources. Therefore, the landfill disposal method does not conform to the environmental concept of sustainable development. The implementation of the new standard of the "Hazardous Waste Landfill Pollution Control Standard" has tightened the requirements for water-soluble salts, heavy metal leaching and other indicators, limiting the entry of fly ash into flexible landfills, increasing the cost and difficulty of fly ash chelation, and rigid landfills will withdraw from the waste incineration fly ash landfill market in the face of disposal prices and the trend of zero landfill. Fly ash resource technology has become a necessary condition under the current policy background.

[0004] The resource disposal of fly ash is an important part of the source reduction in the process of accelerating the promotion of "zero waste cities". Rock wool is a new type of building material that can be used in fire prevention, sound insulation, heat insulation and other scenarios. Fly ash cotton making is an important measure to practice green development and promote the construction of "zero waste cities". Summary of the invention

[0005] To this end, an embodiment of the present invention provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw material.

[0006] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0007] According to a first aspect of an embodiment of the present invention, the present invention provides a process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material, the process comprising the following steps:

[0008] (1) The fly ash from the incineration of domestic waste is washed, dehydrated and dried to obtain dechlorinated fly ash;

[0009] (2) feeding dechlorinated fly ash, basalt, slag, dolomite and coke into an oxygen-enriched side-blown furnace for melting to obtain molten slurry;

[0010] (3) The slurry is centrifuged to form rock wool fibers, a binder is added, and then pressed to obtain the thermal insulation rock wool.

[0011] In some preferred embodiments, in step (1), the domestic waste incineration fly ash is subjected to three-stage water washing at a liquid-to-solid ratio of 5-10:1.

[0012] In some preferred embodiments, in step (2), by weight, the dechlorinated fly ash is 250-350 parts, the basalt is 230-330 parts, the slag is 130-230 parts, the dolomite is 80-120 parts, and the coke is 100-180 parts.

[0013] In some preferred embodiments, by weight, the dechlorinated fly ash is 300 parts, the basalt is 280 parts, the slag is 180 parts, the dolomite is 100 parts, and the coke is 140 parts.

[0014] In some preferred embodiments, in step (2), the melting temperature is 1400-1500°C.

[0015] In some preferred embodiments, in step (3), the amount of binder used is 120-130 kg for every 1000 kg of thermal insulation rock wool produced, wherein the binder is a mixture of phenolic resin glue with a solid content of 42% and water in a weight ratio of 1:3.

[0016] In some preferred embodiments, in step (3), the pressing and molding conditions are as follows: the maximum weight of the thermal insulation rock wool per cubic meter is pressed to 200 kg, and the thermal insulation rock wool is dried and molded at a temperature of 250-300°C.

[0017] According to a second aspect of an embodiment of the present invention, the present invention provides a thermal insulation rock wool, which is made by the process as described in any one of the above items.

[0018] The embodiments of the present invention have the following advantages:

[0019] The present invention uses water washing to fully dechlorinate fly ash from the incineration of domestic waste. The solution of the fly ash washing is evaporated and crystallized, and the obtained salt can be used in printing and dyeing factories or as a ground snow-melting agent in northern winter. The water recovered by the steam through condensation technology can be used again for washing the fly ash, thereby realizing the recycling of water. While increasing economic income, it can also maximize the utilization of water resources and achieve the purpose of saving water resources.

[0020] The invention scientifically mixes dechlorinated fly ash with basalt, slag, dolomite and coke, sends the mixture into an oxygen-enriched side-blown furnace for slurry, forms filamentous rock wool fibers through a centrifuge, and then forms and processes the fibers to prepare thermal insulation rock wool products whose performance meets the requirements of GB11835-2016.

[0021] The present invention eliminates potential risks in the hazardous waste disposal industry from the source, avoids the occurrence of environmental pollution problems, and simultaneously prepares thermal insulation rock wool products with performance meeting the requirements of GB11835-2016, thereby achieving effective utilization of resources and having significant economic benefits. DETAILED DESCRIPTION

[0022] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the following content:

[0024] Basalt: Density is 2.7-2.9 tons / m3, composition includes: silicon dioxide 44-49%, aluminum oxide 12-15%, calcium oxide 7-12%, magnesium oxide 6-12%, particle diameter 80-150mm, can be purchased directly from the market.

[0025] Slag: density is 2-3 tons / m3, composition includes: silicon dioxide 33-40%, aluminum oxide 6.5-8.5%, calcium oxide 739-43%, magnesium oxide 7.5-9.5%, particle diameter 80-120mm, can be purchased directly from the market.

[0026] Dolomite: Density is 2.8-2.9 tons / m3, composition includes: silicon dioxide 1-2%, aluminum oxide 2-4%, calcium oxide 25-28%, magnesium oxide 15-20%, particle diameter 80-150mm, can be purchased directly from the market.

[0027] Coke: density is 0.9-1 ton / m3, composition includes: fixed carbon greater than 85%, sulfur less than 0.7%, ash less than 13%, calorific value greater than 6800 kcal / kg, moisture less than 2.5%, particle diameter between 80-150mm, can be purchased directly from the market.

[0028] Phenolic resin glue: solid content is greater than 42%, and can be purchased directly from the market.

[0029] Example 1

[0030] This embodiment provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw materials, comprising the following steps:

[0031] (1) The fly ash from the incineration of domestic waste is washed with water in three stages at a liquid-to-solid ratio of 5:1, and then dehydrated and dried to obtain dechlorinated fly ash;

[0032] (2) 300 parts by weight of dechlorinated fly ash, 280 parts by weight of basalt, 180 parts by weight of slag, 100 parts by weight of dolomite and 140 parts by weight of coke are fed into an oxygen-enriched side-blown furnace and melted at a temperature of 1400° C. to obtain slurry;

[0033] (3) The molten slurry is centrifuged to form rock wool fibers, and 120 kg of mixed glue (phenolic resin glue with a solid content of 42% and water mixed in a weight ratio of 1:3) is sprayed into each 1000 kg of thermal insulation rock wool produced, and then pressed and molded at 300° C. to obtain thermal insulation rock wool.

[0034] Example 2

[0035] This embodiment provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw materials, comprising the following steps:

[0036] (1) The fly ash from the incineration of domestic waste is washed with water in three stages at a liquid-to-solid ratio of 6:1, and then dehydrated and dried to obtain dechlorinated fly ash;

[0037] (2) 260 parts by weight of dechlorinated fly ash, 290 parts by weight of basalt, 180 parts by weight of slag, 110 parts by weight of dolomite and 120 parts by weight of coke are introduced into an oxygen-enriched side-blown furnace and melted at a temperature of 1450° C. to obtain slurry;

[0038] (3) The molten slurry is centrifuged to form rock wool fibers, and 122 kg of mixed glue (phenolic resin glue with a solid content of 42% and water mixed in a weight ratio of 1:3) is sprayed into each 1000 kg of thermal insulation rock wool produced, and then pressed and molded at 250° C. to obtain thermal insulation rock wool.

[0039] Example 3

[0040] This embodiment provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw materials, comprising the following steps:

[0041] (1) The fly ash from the incineration of domestic waste is washed with water in three stages at a liquid-to-solid ratio of 7:1, and then dehydrated and dried to obtain dechlorinated fly ash;

[0042] (2) 320 parts by weight of dechlorinated fly ash, 240 parts by weight of basalt, 200 parts by weight of slag, 80 parts by weight of dolomite and 160 parts by weight of coke are fed into an oxygen-enriched side-blown furnace and melted at a temperature of 1500° C. to obtain slurry;

[0043] (3) The slurry is centrifuged to form rock wool fibers, and 120 kg of mixed glue (phenolic resin glue with a solid content of 42% and water mixed in a weight ratio of 1:3) is sprayed into each 1000 kg of thermal insulation rock wool produced, and then pressed and molded at 280° C. to obtain thermal insulation rock wool.

[0044] Example 4

[0045] This embodiment provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw materials, comprising the following steps:

[0046] (1) The fly ash from the incineration of domestic waste is washed with water in three stages at a liquid-to-solid ratio of 8:1, and then dehydrated and dried to obtain dechlorinated fly ash;

[0047] (2) 280 parts by weight of dechlorinated fly ash, 320 parts by weight of basalt, 150 parts by weight of slag, 120 parts by weight of dolomite and 150 parts by weight of coke are introduced into an oxygen-enriched side-blown furnace and melted at a temperature of 1400° C. to obtain slurry;

[0048] (3) The slurry is centrifuged to form rock wool fibers, and 125 kg of mixed glue (phenolic resin glue with a solid content of 42% and water mixed in a weight ratio of 1:3) is sprayed into each 1000 kg of thermal insulation rock wool produced, and then pressed and molded at 280° C. to obtain thermal insulation rock wool.

[0049] Example 5

[0050] This embodiment provides a process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw materials, comprising the following steps:

[0051] (1) The fly ash from the incineration of domestic waste is washed with water in three stages at a liquid-to-solid ratio of 10:1, and then dehydrated and dried to obtain dechlorinated fly ash;

[0052] (2) 300 parts by weight of dechlorinated fly ash, 260 parts by weight of basalt, 230 parts by weight of slag, 100 parts by weight of dolomite and 180 parts by weight of coke are fed into an oxygen-enriched side-blown furnace and melted at a temperature of 1450° C. to obtain slurry;

[0053] (3) The molten slurry is centrifuged to form rock wool fibers, and 120 kg of mixed glue (phenolic resin glue with a solid content of 42% and water mixed in a weight ratio of 1:3) is sprayed into each 1000 kg of thermal insulation rock wool produced, and then pressed and molded at 300° C. to obtain thermal insulation rock wool.

[0054] Test Example 1

[0055] The fly ash from the incineration of domestic waste is washed with water at three stages, and the salt chlorides enter the liquid phase for full dechlorination. Through dehydration and drying, dechlorinated fly ash containing a large amount of calcium, silicon and aluminum mineral components is obtained.

[0056] The dechlorinated fly ash obtained in step (1) of Examples 1-5 was tested and the results are shown in Table 1 below.

[0057] Table 1

[0058]

[0059] Table 2

[0060]

[0061]

[0062] The results show that the dioxin concentration in the dechlorinated fly ash obtained in the embodiment of the present invention is less than 30 ng-TEQ / kg, the total copper is less than 0.4 mg / l, the total zinc is less than 1.5 mg / l, the total manganese is less than 1.2 mg / l, the total selenium is less than 0.05 mg / l, and the soluble chlorine does not exceed 0.8%, meeting the environmental protection standard requirements (Table 2).

[0063] Test Example 2

[0064] The thermal insulation rock wool obtained in Examples 1-5 was tested for performance, and the results are shown in Table 3 below.

[0065] Table 3

[0066]

[0067] Table 4

[0068]

[0069] The results show that the performance of the thermal insulation rock wool product provided by the embodiment of the present invention meets the requirements of GB11835-2016 (Table 4).

[0070] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A process for preparing thermal insulation rock wool using fly ash from the incineration of domestic waste as raw material, characterized in that: The process comprises the following steps: (1) The fly ash from the incineration of domestic waste is washed, dehydrated and dried to obtain dechlorinated fly ash; (2) feeding dechlorinated fly ash, basalt, slag, dolomite and coke into an oxygen-enriched side-blown furnace for melting to obtain slurry; (3) The slurry is centrifuged to form rock wool fibers, a binder is added, and then pressed to obtain the thermal insulation rock wool.

2. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 1, characterized in that: In step (1), the domestic waste incineration fly ash is subjected to three-stage water washing at a liquid-to-solid ratio of 5-10:

1.

3. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 1, characterized in that: In step (2), by weight, the dechlorinated fly ash is 250-350 parts, the basalt is 230-330 parts, the slag is 130-230 parts, the dolomite is 80-120 parts, and the coke is 100-180 parts.

4. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 3, characterized in that: In terms of weight, the dechlorinated fly ash is 300 parts, the basalt is 280 parts, the slag is 180 parts, the dolomite is 100 parts, and the coke is 140 parts.

5. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 1, characterized in that: In step (2), the melting temperature is 1400-1500°C.

6. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 1, characterized in that: In step (3), for every 1000kg of thermal insulation rock wool produced, the amount of binder used is 120-130kg, wherein the binder is a mixture of phenolic resin glue with a solid content of 42% and water in a weight ratio of 1:

3.

7. The process for preparing thermal insulation rock wool using fly ash from incineration of domestic waste as raw material according to claim 1, characterized in that: In step (3), the pressing and molding conditions are as follows: the maximum weight of thermal insulation rock wool per cubic meter is pressed to 200 kg, and then dried and molded at a temperature of 250-300°C.

8. A thermal insulation rock wool, characterized in that: The method is prepared by the process described in any one of claims 1 to 7.

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