Method for preparing light calcium carbonate from carbide slag as raw material
A light calcium carbonate, carbide slag technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of high disposal cost, secondary pollution, pollution, etc. The method is simple and the effect of no secondary pollution
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Embodiment 1
[0032] Select new wet-process acetylene carbide slag from a salinization enterprise (moisture content 41.7%, peculiar smell, gray-black), commercially available canned liquid carbon dioxide, commercially available chlorine dioxide oxidant, and prepare light calcium carbonate according to the following steps:
[0033] (1) Suspension slurry preparation and detoxification and deodorization: break up calcium carbide slag, add water to make a suspension slurry with a water / solid ratio of 5:1, and continuously add chlorine dioxide oxidant until the odor is completely eliminated, effectively The amount of chlorine dioxide oxidizing agent is 0.009% of the calcium carbide slag quality; obtain non-toxic suspension slurry;
[0034] (2) Filtration and dissolution separation: at 20°C, the filtration and dissolution separation is carried out by means of a pump-type suction filtration device with a filter pore size of 61 μm in the swirling suspension in the stirring tank. In the case of conti...
Embodiment 2
[0041] Select the wet-process acetylene carbide slag yard slag (moisture content 31.4%, peculiar smell, off-white) of a salinization enterprise, carbon dioxide captured by a carbon washing tower of an enterprise, self-made potassium ferrate oxidant, and produce light carbonic acid according to the following steps calcium:
[0042] (1) Suspension slurry preparation and detoxification and deodorization: break up calcium carbide slag, add water to make a suspension slurry with a water / solid ratio of 9:1, and continuously add potassium ferrate dropwise while breaking up the suspension slurry Oxidant solution until the peculiar smell is completely eliminated, and the effective dosage of potassium ferrate oxidant is 0.008% of the quality of carbide slag; a non-toxic suspension slurry is obtained;
[0043] (2) Filtration separation: At 28°C, the filtration and dissolution separation is carried out by means of centrifugal filter disc separation with a filter pore size of 53 μm in the ...
Embodiment 3
[0050] Select a company's dry acetylene carbide slag yard slag (moisture content 5.1%, peculiar smell, off-white), carbon dioxide captured by a company's carbon washing tower, self-made sodium ferrate oxidant, and prepare light calcium carbonate according to the following steps:
[0051] (1) Suspension slurry preparation and detoxification and deodorization: Disperse calcium carbide slag at 28°C, add water to make a suspension slurry with a water / solid ratio of 10:1, and continuously add sodium ferrate oxidant solution until the odor The odor is completely eliminated, and the effective dosage of sodium ferrate oxidant is 0.009% of the quality of carbide slag; a non-toxic suspension slurry is obtained;
[0052] (2) Filtration separation: At 33°C, filtration separation is carried out by spraying water dissolution separation on a filter belt with a filter hole size of 58 μm. In the case of continuous spraying of dissolution water, the non-toxic suspension slurry is separated into ...
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