Method for producing boehmite by using washing liquor
A technique of pseudo-boehmite and washing liquid, which is applied in the field of producing pseudo-boehmite by using washing liquid, can solve the problems such as affecting the balance of alumina production liquid, large restriction of alumina production, affecting the output of finished alumina, etc. , to achieve the effect of low production raw material cost, abundant raw material quantity, and production raw material cost reduction effect.
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Embodiment 1
[0024] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:
[0025] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 35g / L, Na 2 O concentration (weight) is 30g / L) into the desiliconization tank, add 5g of red mud and 5g of lime per liter of washing liquid, stir evenly, heat up to 75°C with steam, and keep it warm for 1 hour for desilication;
[0026] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 35g / L) and filter cake, and filter cake returns alumina production and carries out batching;
[0027] The third step: transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 30°C, and then use alumina to produce CO 2 After the exha...
Embodiment 2
[0032] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:
[0033] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 50g / L, Na 2 O concentration (weight) is 35g / L) into the desiliconization tank, add 25g red mud and 25g lime for each liter of washing liquid, stir evenly, heat up to 85°C with steam, and keep warm for 3 hours for desilication;
[0034] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 50g / L) and filter cake, and filter cake returns alumina production and carries out batching;
[0035] Step 3: Transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 45°C, and then use alumina to produce CO 2 After the exhaust gas i...
Embodiment 3
[0040] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:
[0041] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 65g / L, Na 2 O concentration (weight) is 55g / L) into the desiliconization tank, add 35g red mud and 35g lime per liter of washing liquid, stir evenly, heat up to 95°C with steam, and keep warm for 1 hour for desiliconization;
[0042] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 65g / L) and filter cake, and filter cake returns alumina production and carries out batching;
[0043] The third step: transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 55°C, and then use alumina to produce CO2 After the exhaust g...
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