Method for preparing manganese carbonate, ammonium sulfate and potassium sulfate compound fertilizer by using Mn-containing residue in electrolytic MnO2 and electrolytic Mn production

Abstract

The invention discloses a method for preparing a manganese carbonate, ammonium sulfate and potassium sulfate compound fertilizer by using a Mn-containing residue in electrolytic MnO2 and electrolytic Mn production. The method comprises the steps of firstly weighing the Mn-containing residue, adding clear water and H2SO4 and carrying out temperature-programming reaction; and sectionally adding limestone, Ca(OH)2, NH4HCO3, (NH4)2CO3, K2CO3, KOH and H2SO4, controlling decomposition, transformation and synthesis reaction conditions, filtering, separating, purifying, evaporating, concentrating, crystallizing and drying a product to obtain MnCO3, CaSO4, (NH4)2SO4.H2SO4 and Si-Al gangue residues. According to the method, the Mn-containing residue for producing electrolytic MnO2 and electrolytic Mn can be completely recycled, three industrial waste emissions are avoided and resource utilization of the maximum extent is achieved.

Description

technical field

[0001] The invention relates to the field of chemical technology, in particular to the treatment of electrolytic MnO 2 Manganese pollution of Mn-containing waste slag from electrolysis of Mn, environmental protection, recycling of manganese regeneration resources, preparation of manganese carbonate (MnCO 3 ) Ammonium sulfate potassium sulfate compound fertilizer ((NH 4 ) 2 SO 4 ·K 2 SO 4 ) of a method. Background technique

[0002] Electrolytic MnO 2 It is mainly used in the production of dry batteries, and is used as the positive electrode material of alkaline manganese type, mercury-free alkaline manganese type, and lithium manganese type dry batteries. The production and export volume of dry batteries in my country rank first in the world. At present, my country's electrolytic MnO 2 The annual output is 260,000 tons. Due to the development of modern industry, especially the development of electronic industry, the electrolysis of MnO 2 The demand is...

Examples

Embodiment

[0029] Measure H 2 Put 450ml of O into a 2000ml three-neck flask, start stirring, add 500g of Mn-containing waste residue (dry basis) with a Mn content of 4.5%, beat it into a uniform slurry, add 70ml of industrial sulfuric acid with a mass fraction of 98%, and heat up to 140°C. Stir the reaction, connect the air outlet pipe to the serpentine condenser tube for full reflux, and start the central control after 30 minutes of reaction, take the slurry and mix it to analyze the Mn content in the slag, when the reaction is 80 minutes, the Mn content in the slag is 0.073%, stop heating, add H 2 O 200ml stirred and naturally cooled down to 80°C;

[0030] Add limestone water slurry with a solid content of 50% to the above slurry, react at a temperature of 60-65°C, and control the slag CaSO 4 The mass percentage content is 36.4%, stop adding limestone water slurry, add appropriate amount of H 2 O, pour out the slurry, filter with a vacuum pump, filter and separate the slurry, get 200...

technical field

[0001] The invention relates to the field of chemical technology, in particular to the treatment of electrolytic MnO 2 Manganese pollution of Mn-containing waste slag from electrolysis of Mn, environmental protection, recycling of manganese regeneration resources, preparation of manganese carbonate (MnCO 3 ) Ammonium sulfate potassium sulfate compound fertilizer ((NH 4 ) 2 SO 4 ·K 2 SO 4 ) of a method. Background technique

[0002] Electrolytic MnO 2 It is mainly used in the production of dry batteries, and is used as the positive electrode material of alkaline manganese type, mercury-free alkaline manganese type, and lithium manganese type dry batteries. The production and export volume of dry batteries in my country rank first in the world. At present, my country's electrolytic MnO 2 The annual output is 260,000 tons. Due to the development of modern industry, especially the development of electronic industry, the electrolysis of MnO 2 The demand is...

Examples

Embodiment

[0029] Measure H 2 Put 450ml of O into a 2000ml three-neck flask, start stirring, add 500g of Mn-containing waste residue (dry basis) with a Mn content of 4.5%, beat it into a uniform slurry, add 70ml of industrial sulfuric acid with a mass fraction of 98%, and heat up to 140°C. Stir the reaction, connect the air outlet pipe to the serpentine condenser tube for full reflux, and start the central control after 30 minutes of reaction, take the slurry and mix it to analyze the Mn content in the slag, when the reaction is 80 minutes, the Mn content in the slag is 0.073%, stop heating, add H 2 O 200ml stirred and naturally cooled down to 80°C;

[0030] Add limestone water slurry with a solid content of 50% to the above slurry, react at a temperature of 60-65°C, and control the slag CaSO 4 The mass percentage content is 36.4%, stop adding limestone water slurry, add appropriate amount of H 2 O, pour out the slurry, filter with a vacuum pump, filter and separate the slurry, get 200...