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Ammonia process separation and refinement method of lead sulfate

A refining method, the technology of lead sulfate, applied in the direction of lead sulfate, etc., can solve the problems of explosion, corrosion of partitions, consumption of sulfuric acid, etc., and achieve the effect of simple and efficient separation process, process safety and environmental protection, and short process flow

Inactive Publication Date: 2015-12-30
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the repeated cycles of hydrochloric acid, the lead-acid battery is self-discharged, the capacity is reduced, and the electrode is severely damaged, which shortens the life.
In addition, when charging, the chlorine and hydrogen in the battery are mixed, which is easy to explode, especially when there is sunlight, the danger of explosion is more likely to occur
[0019] 2. The harm of nitric acid to lead-acid batteries
Because nitric acid does not disappear after repeated cycles in the electrolyte, it is very harmful
In addition, when there is nitric acid, the nitric acid reacts with impurities in the electrolyte to release heat, which will cause the temperature of the electrolyte to increase significantly.
[0024] 3. The harm of iron to lead-acid batteries
[0026] 4. Hazards of manganese compounds
[0034] It can be seen from the above reaction formula that although the manganese dioxide produced by the reaction on the negative plate is precipitated, the most destructive strong oxidant—permanganic acid is formed on the positive plate, which corrodes the separator and even makes the separator Perforation, causing short circuit of electrodes, and consumption of sulfuric acid in electrolyte

Method used

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  • Ammonia process separation and refinement method of lead sulfate

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Effect test

Embodiment 1

[0069] Such as figure 1 As shown, an ammonia separation and refining method of lead sulfate, especially with PbSO 4 The crude product is used as raw material, using NH 3 ·-(NH 4 ) 2 SO 4 The aqueous solution is used as the solvent, and the PbSO 4 The separation and refinement of PbSO 4 While separating and refining, using PbSO 4 Easily soluble in NH at low temperature and high pressure 3 Aqueous solution, and ammonia is easy to volatilize and remove under high temperature and low pressure, so as to realize the recycling of ammonia. Specific steps are as follows:

[0070] (1) Leaching and dissolving: in the leaching and dissolving equipment, add NH 3 、H 2 O, (NH 4 ) 2 SO 4 and PbSO 4 Crude product, the molar concentration of free ammonia in the leach solution is 6.0mol / L, the molar concentration of ammonium sulfate in the solution is 6.0mol / L, and the operating temperature is 20°C, so that PbSO 4 Leach dissolved in NH 3 ·H 2 O-(NH 4 ) 2 SO 4 In the aqueous s...

Embodiment 2

[0077] Such as figure 1 As shown, an ammonia separation and refining method of lead sulfate, especially with PbSO 4 The crude product is used as raw material, using NH 3 ·H 2 O-(NH 4 ) 2 SO 4 The aqueous solution is used as the solvent, and the coupling technology of leaching and dissolving-impurity removal and refining-evaporation crystallization-solid-liquid separation is used to realize the PbSO 4 The separation and refinement of PbSO 4 While separating and refining, using PbSO 4 Easily soluble in NH at low temperature and high pressure 3 Aqueous solution, and ammonia is easy to volatilize and remove under high temperature and low pressure, so as to realize the recycling of ammonia. It is characterized in that the method steps are as follows:

[0078] (1) Leaching and dissolving: in the leaching and dissolving equipment, add NH 3 、H 2 O, (NH 4 ) 2 SO 4 and PbSO 4 Crude product, the molar concentration of free ammonia in the leach solution is 36.0mol / L, the mo...

Embodiment 3

[0085] Such as figure 1 As shown, an ammonia separation and refining method of lead sulfate, especially with PbSO 4 The crude product is used as raw material, using NH 3 ·H 2 O-(NH 4 ) 2 SO 4 The aqueous solution is used as the solvent, and the coupling technology of leaching and dissolving-impurity removal and refining-evaporation crystallization-solid-liquid separation is used to realize the PbSO 4 The separation and refinement of PbSO 4 While separating and refining, using PbSO 4 Easily soluble in NH at low temperature and high pressure 3 Aqueous solution, and ammonia is easy to volatilize and remove under high temperature and low pressure, so as to realize the recycling of ammonia. It is characterized in that the method steps are as follows:

[0086] (1) Leaching and dissolving: in the leaching and dissolving equipment, add NH 3 、H 2 O, (NH 4 ) 2 SO 4 and PbSO 4 Crude product, the molar concentration of free ammonia in the leach solution is 16.0mol / L, the mo...

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Abstract

The invention relates to an ammonia process separation and refinement method of lead sulfate (PbSO4) and belongs to the technical field of preparation of inorganic chemical products and three-waste comprehensive utilization of lead storage battery electrode materials. Particularly, a PbSO4 crude product is taken as a raw material, an NH3*H2O-(NH4)2SO4 aqueous solution is taken as a solvent, separation and refinement of PbSO4 are realized through leaching dissolution, purification, refinement, evaporative crystallization and solid-liquid separation and coupling techniques, and meanwhile, ammonia is recycled by means of characteristics of easy dissolution of PbSO4 in a NH3 aqueous solution at the low temperature and under high pressure and easy volatilization and removal at the high temperature and under low pressure. The method adopts a reasonable procedure and is simple, the product purity is high, the quality is stable, the yield is high, and the process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of three wastes treatment and resource utilization, especially the technical field of comprehensive utilization of waste lead storage batteries; it also belongs to the technical field of chemical separation; it also belongs to the technical field of preparation of inorganic materials. The present invention specifically relates to a kind of lead sulfate (PbSO 4 ) ammonia separation and refining method. Background technique [0002] Lead Sulfate (PbSO 4 ), with a molecular weight of 303.26, is the main component of lead alum or lead sulfate ore, and is also the main component of electrode materials for waste lead storage batteries. Lead sulfate is insoluble in water, sulfuric acid solution and common solvents. At present, lead sulfate is mainly used in the manufacture of lead salts, pigments, paints, and can also be used as a catalyst to produce metallic lead and its compounds. [0003] The main methods of...

Claims

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Application Information

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IPC IPC(8): C01G21/20
Inventor 许文林聂文王雅琼吕佳乐张涛张小兴
Owner YANGZHOU UNIV
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