Method for preparing light porous low-toxicity chemical sludge-based filler
A chemical sludge and lightweight technology, which is applied in the production of clay products, ceramic products, ceramic materials, etc., can solve the problems of underdeveloped pores, difficult to effectively stabilize, and high preparation costs, and achieve well-developed pores, low heavy metal leaching rate, and accumulation The effect of low density
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Embodiment 1
[0017] The formula of this embodiment is: 30 parts of chemical sludge incineration ash, 6 parts of sawdust, 6 parts of calcium carbonate, 2 parts of zeolite, and 56 parts of clay. The heavy metal leaching concentrations of the chemical sludge incineration ash used in this example are shown in Table 1.
[0018] Table 1 Chemical sludge incineration ash leaching test results
[0019]
[0020] Before batching, chemical sludge incineration ash, zeolite and clay are ground and passed through a 100-mesh sieve; wood chips are crushed and passed through a 40-mesh sieve. After the dry ingredients are mixed, add water and stir thoroughly, and after stirring evenly, granulate to make raw meal balls. The raw meal balls are first dried in an oven at 95°C for 70 minutes; then moved into a muffle furnace, the temperature is raised to 300°C, the heating rate is 15°C / min, the holding time is 40min, and then at a heating rate of 18°C / min, Gradually raise the temperature to the roasting temp...
Embodiment 2
[0028] The formula of this embodiment is: 40 parts of chemical sludge incineration ash, 4 parts of straw, 4 parts of potassium carbonate, 4 parts of bentonite, and 48 parts of shale. The heavy metal leaching concentrations of the chemical sludge incineration ash used in this example are shown in Table 4.
[0029] Table 4 Chemical sludge incineration ash leaching test results
[0030]
[0031] Before batching, chemical sludge incineration ash, bentonite and shale are ground and passed through a 100-mesh sieve; straw is crushed and passed through a 40-mesh sieve. After the dry ingredients are mixed, add water and stir thoroughly, and after stirring evenly, granulate to make raw meal balls. The raw meal balls are first dried in an oven at 105°C for 60 minutes; then moved into a muffle furnace, heated to 350°C, the heating rate is 18°C / min, the holding time is 30min, and then at a heating rate of 20°C / min, Gradually raise the temperature to the roasting temperature of 1100°C ...
Embodiment 3
[0039] The formula of this embodiment is: 50 parts of chemical sludge incineration ash, 2 parts of rice husk, 2 parts of sodium carbonate, 6 parts of titanium gypsum, and 40 parts of clay. The heavy metal leaching concentration of the chemical sludge incineration ash used in this example is shown in Table 7.
[0040] Table 7 Chemical sludge incineration ash leaching test results
[0041]
[0042] Before batching, chemical sludge incineration ash, titanium gypsum and clay are ground and passed through a 100-mesh sieve; rice husks are crushed and passed through a 40-mesh sieve. After the dry ingredients are mixed, add water and stir thoroughly, and after stirring evenly, granulate to make raw meal balls. The raw meal balls were first dried in an oven at 115°C for 50 minutes; then moved into a muffle furnace, the temperature was raised to 400°C, the heating rate was 20°C / min, the holding time was 20min, and then at a heating rate of 22°C / min, Gradually raise the temperature ...
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