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Process method for preparing ammonia water and sulfuric acid from ammonium sulfate solution

A technology of ammonium sulfate solution and process method, which is applied in chemical instruments and methods, preparation/separation of ammonia, ammonia compounds, etc., can solve problems such as waste of sulfuric acid and ammonia water, environmental pollution, use of agricultural fertilizers, etc., and achieve simple process, Strong operability, realize the effect of continuous recycling

Inactive Publication Date: 2018-12-21
NINGXIA TIANYUAN MANGANESE LIMITED
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Problems solved by technology

[0003] The existing treatment for ammonium sulfate double salt crystallization mainly focuses on agricultural fertilizers, but due to its large output, a considerable part exists in the form of double salt crystallization (such as ammonium sulfate produced by hydrometallurgy, etc.), and cannot be used as However, long-term storage of such industrial waste residues containing metals, ammonium nitrogen, and sulfides will not only cause serious pollution to the environment, but also cause waste of sulfuric acid and ammonia

Method used

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  • Process method for preparing ammonia water and sulfuric acid from ammonium sulfate solution
  • Process method for preparing ammonia water and sulfuric acid from ammonium sulfate solution
  • Process method for preparing ammonia water and sulfuric acid from ammonium sulfate solution

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Embodiment Construction

[0026] Such as figure 1 Shown, the processing method of a kind of ammonium sulfate solution decomposing ammoniacal liquor and sulfuric acid is:

[0027] (1) Temporarily store the solid ammonium sulfate in the ammonium sulfate solution storage tank 1 after dissolving it, then transport it to the heat exchange tubes of the heat exchanger 2 and heat it to 95°C;

[0028] (2) A solid catalyst is added in the reaction kettle 3, and the stirring device installed in the reaction kettle 3 is continuously stirred; the heat transfer liquid is heated by the heating device 4, and the heat transfer liquid is placed in the jacket of the reaction kettle 3 and the reaction kettle 3 Circulation is carried out in the jacket of the built-in steel pipe, the reactor 3 is heated, and the catalyst is heated to 350°C;

[0029] (3) The ammonium sulfate solution heated in step (1) is intermittently sprayed into the reaction kettle 3 in which the catalyst has been loaded in step (2), so that the ammoniu...

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Abstract

The invention belongs to the field of chemical waste disposal, and relates to a process method for preparing ammonia water and sulfuric acid from an ammonium sulfate solution. The process method comprises: (1) dissolving solid ammonium sulfate into the ammonium sulfate solution; (2) adding a catalyst into a reaction kettle and heating, and spraying the ammonium sulfate solution into the reaction kettle; (3) performing heat exchange on released vapor and ammonia gas when reaction temperature reaches 100 DEG C - 130 DEG C, thus obtaining the ammonia water; (4) when the temperature of the reaction kettle drops to 130 DEG C or below, stopping spraying the ammonium sulfate solution, continuing to heat to 300 DEG C - 350 DEG C and releasing sulfur trioxide gas, and then performing preliminary condensation and absorption with dilute sulfuric acid in sequence, thus obtaining the sulfur acid. The process method realizes low-temperature decomposition of ammonium sulfate at 400 DEG C or below bya solid-liquid catalytic method and achieves resource utilization of industrial waste with a simple process, high operability, energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the field of chemical waste treatment and relates to a process for preparing ammonia water and sulfuric acid from an ammonium sulfate solution. Background technique [0002] Ammonium sulfate industrial waste mainly comes from the by-products of hydrometallurgy, boiler flue gas desulfurization and industrial wastewater treatment, and its output is quite large; according to statistics, the annual output of ammonium sulfate industrial waste in my country is about 10 million tons or more. Especially in the electrolytic manganese industry, due to the characteristics of the process, a large amount of ammonium sulfate double salt crystals will be generated during the production process; specifically, for every 1 ton of manganese metal produced, about 2.1 tons of ammonium sulfate double salt crystals will be produced. Continue, the generation amount of ammonium sulfate double salt crystallization also increases gradually, has caused se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01C1/02
CPCC01B17/745C01C1/028
Inventor 贾天将段锋宋正平张志华刘宁董伏华
Owner NINGXIA TIANYUAN MANGANESE LIMITED
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