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Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone

A technology of lead hydroxide and silver chloride, which is applied in the direction of lead hydroxide, etc., can solve the problems of no treatment and utilization methods, heavy metal pollution of the environment, waste of resources, etc., and is suitable for popularization and application, with few by-products and low equipment investment costs low effect

Inactive Publication Date: 2011-08-31
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, this kind of waste residue is mostly piled up in the open air or used to fill gaps and pave roads, which not only wastes resources, but also seriously pollutes the environment with heavy metals.
For this reason people have carried out a large amount of researches, in the 1973 issue of "Fine Chemical Intermediates", the production of various products with lithopone waste residues has been studied, and "Hunan Chemical Industry" also reported in the 1992 volume 22, phase 1 "Research on the Preparation of Lead Sulfate from Lithopone Acid Leaching Waste Residue", but the article is only in theoretical research, and there is no practical treatment and utilization method

Method used

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  • Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone
  • Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone
  • Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone

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Embodiment 1

[0022] refer to figure 1 , a method for preparing a mixture of lead hydroxide and silver chloride with lithopone gained waste residue, comprising the following specific steps: weighing 500 kg of lithopone gained waste residue, converted lead chloride content wherein is 173.15 kg, and its mole The content is: 529.51 moles, the content of silver chloride is 17.5kg, and it is ground into 80-120 mesh coarse powder, and put into the corrosion-resistant reactor one (1) together with sodium hydroxide, so that the chlorination in the corrosion-resistant reactor The mass ratio of lead and sodium hydroxide is 1:2, a chemical reaction occurs under gentle stirring to obtain a mixture containing lead hydroxide, sodium chloride, silver chloride and elemental sulfur; The mixture of sodium and elemental sulfur is coarsely filtered through filter one (2) to obtain microemulsion and elemental sulfur filter cake; the elemental sulfur filter cake enters another process for further processing to o...

Embodiment 2

[0026] refer to figure 1 , a method for preparing a mixture of lead hydroxide and silver chloride with lithopone gained waste residue, comprising the following specific steps: weighing 500 kg of lithopone gained waste residue, converted lead chloride content wherein is 173.15 kg, and its mole The content is: 529.51 moles, the content of silver chloride is 17.5kg, and it is ground into 80-120 mesh coarse powder, and put into the corrosion-resistant reactor one (1) together with sodium hydroxide, so that the chlorination in the corrosion-resistant reactor The mass ratio of lead and sodium hydroxide is 1:2.5, and a chemical reaction occurs under gentle stirring to obtain a mixture containing lead hydroxide, sodium chloride, silver chloride and elemental sulfur; The mixture of sodium and elemental sulfur is coarsely filtered through filter one (2) to obtain microemulsion and elemental sulfur filter cake; the elemental sulfur filter cake enters another process for further processin...

Embodiment 3

[0030] refer to figure 1, a method for preparing a mixture of lead hydroxide and silver chloride with lithopone gained waste residue, comprising the following specific steps: weighing 500 kg of lithopone gained waste residue, converted lead chloride content wherein is 173.15 kg, and its mole The content is: 529.51 moles, the content of silver chloride is 17.5kg, and it is ground into 80-120 mesh coarse powder, and put into the corrosion-resistant reactor one (1) together with sodium hydroxide, so that the chlorination in the corrosion-resistant reactor The mass ratio of lead and sodium hydroxide is 1:1.5, and a chemical reaction occurs under gentle stirring to obtain a mixture containing lead hydroxide, sodium chloride, silver chloride and elemental sulfur; The mixture of sodium and elemental sulfur is coarsely filtered through filter one (2) to obtain microemulsion and elemental sulfur filter cake; the elemental sulfur filter cake enters another process for further processing...

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Abstract

The present invention provides a method for preparing lead hydroxide and silver chloride mixture with waste residues from the production of lithopone. The method comprises the following steps of reacting the waste residues from the production of lithopone with sodium hydroxide to obtain a mixture containing lead hydroxide, silver chloride, sodium chloride and elemental sulfur; obtaining clarified micro emulsion and elemental sulfur filter cake after filtering the resultant mixture coarsely; obtaining an elemental sulfur product after subjecting the elemental sulfur filter cake to deep processing; obtaining a lead hydroxide and silver chloride containing filter cake and sodium chloride solution after filtering the clarified micro emulsion finely; obtaining the lead hydroxide and silver chloride mixed product after washing, drying and smashing the lead hydroxide and silver chloride containing filter cake; and obtaining a sodium chloride crystal product by subjecting the sodium chloride solution to distillation and condensation.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of waste residue obtained from lithopone production, in particular to a method for preparing a mixture of lead hydroxide and silver chloride by using waste residue obtained from lithopone production Background technique [0002] Lithopone, commonly known as lithopone, is a mixture of zinc sulfide and barium sulfate. Its main raw material is zinc oxide, which is smelted from lead-zinc ore. This zinc oxide contains a large amount of lead oxide impurities, and the lead oxide content is generally 60-80%. Every ton of lithopone produces 0.165 tons of waste lead slag, and with an annual output of 15,000 tons of lithopone, 2480 tons of lead waste slag with a lead content of 30-40% will be discharged. The main chemical components of its waste lead slag are: lead content is 34.63%, zinc content is 10.50%, manganese content is 2.32%, copper content is 0.23%, cadmium content ...

Claims

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Application Information

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IPC IPC(8): C01G21/12
Inventor 王嘉兴
Owner 王嘉兴
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