Recycling method for anode carbon deposits and aluminum electrolyte
A technology of aluminum electrolyte and anode carbon, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, calcium/strontium/barium halide, calcium/strontium/barium fluoride, etc., which can solve pollution and hazardous waste. environment and other problems, to achieve the effect of simple process and low cost
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Embodiment 1
[0043] Take 50kg of anode carbon slag and 25kg of aluminum electrolyte, mix them evenly with 25kg of lime and 20kg of sodium carbonate, crush and grind them until they pass through a 100-mesh sieve, add water and a small amount of binder to make pellets with a diameter of 5-8mm. The pellets were put into a high-temperature furnace and heated at 1000°C for 1 hour, and the carbonaceous components were completely burned. The pellets after the reaction were completed were taken out, crushed and ground after cooling to room temperature. Put the finely ground sample into a beaker, add 5% mass fraction of sodium hydroxide solution, the liquid-solid ratio is 5:1, and carry out stirring and leaching for 1 hour. The leaching solution is filtered, and the obtained filter residue is newly generated calcium fluoride, the recovery rate of fluorine in the aluminum electrolyte reaches more than 98%, and the purity of the calcium fluoride is higher than 97%. The remaining filtrate is a mixed ...
Embodiment 2
[0045] Take 1000g of anode carbon slag, mix it evenly with 300g of lime and 200g of sodium hydroxide, crush and grind it to obtain -100 mesh gray black powder, add water and a small amount of binder to make pellets with a diameter of 5-10mm. Put the pellets into a high-temperature furnace and heat them at 950°C for 1 hour, and the carbonaceous components in them will burn completely; take out the pellets after heating, crush and grind them after cooling to room temperature, and mix the grinded samples with 5% The mass fraction of sodium hydroxide solution was mixed, the liquid-solid ratio was 8:1, and stirred and leached for 1h. Filter the leaching solution, the obtained filter residue is newly formed calcium fluoride, the recovery rate of fluorine in the electrolyte is over 98%, and the purity of calcium fluoride is higher than 95%; the remaining filtrate is a mixed solution of caustic alkali and sodium aluminate, and the aluminum in the electrolyte The recovery rate of sodiu...
Embodiment 3
[0047] Take 500g of high-lithium-aluminum electrolyte, mix it with 535g of limestone and 250g of sodium carbonate, and grind it to -100 mesh after crushing. Add water and a small amount of binder to make pellets with a diameter of 4 to 6 mm, and put the pellets into a muffle furnace to heat at 1050°C for 80 minutes. The pellet after the reaction was completed was taken out, crushed and ground after cooling to room temperature, mixed with 5% sodium hydroxide solution with a liquid-solid ratio of 4:1, and stirred and leached for 1.5 h. The leaching solution is filtered, and the obtained filter residue is newly generated calcium fluoride, the purity of the calcium fluoride is higher than 98%, and the recovery rate of fluorine in the electrolyte reaches more than 97%. Lithium fluoride is converted into lithium hydroxide and enters the alkaline solution, which can be further processed for recovery, and the recovery rate of lithium in the aluminum electrolyte reaches more than 75%. ...
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