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Method for preparing a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production

A technology of lead carbonate and silver carbonate, applied in the direction of lead carbonate, silver compounds, silver compounds, etc., can solve the problems of waste of resources, heavy metal pollution of the environment, no treatment and utilization methods, etc., and achieve low equipment investment costs, few by-products, Effects suitable for promotional applications

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 a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production
  • Method for preparing a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production
  • Method for preparing a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production

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Embodiment 1

[0023] refer to figure 1 , a method for preparing lead carbonate and silver carbonate mixture with lithopone gained waste slag, comprising the following specific steps: weighing 500kg of lithopone gained waste slag, converting lead chloride content wherein to 173.15kg, and its molar content is : 529.51 moles; the silver chloride content is 17.5kg, and its molar content is: 121.95 moles, and it is ground into 80-120 mesh coarse powder, puts into corrosion-resistant reactor one (1) together with carbonic acid, makes corrosion-resistant reaction In the container, the ratio of the sum of the molar content of lead chloride and silver chloride to the molar content of carbonic acid is 1.12:1, and a chemical reaction occurs under gentle stirring to obtain lead carbonate, silver carbonate, sodium chloride and elemental A mixture of sulfur; the mixture containing lead carbonate, silver carbonate and elemental sulfur is roughly filtered through filter one (2) to obtain a clarified microe...

Embodiment 2

[0027] refer to figure 1 , a method for preparing lead carbonate and silver carbonate mixture with lithopone gained waste slag, comprising the following specific steps: weighing 500kg of lithopone gained waste slag, converting lead chloride content wherein to 173.15kg, and its molar content is : 529.51 moles; the silver chloride content is 17.5kg, and its molar content is: 121.95 moles, and it is ground into 80-120 mesh coarse powder, puts into corrosion-resistant reactor one (1) together with carbonic acid, makes corrosion-resistant reaction In the container, the ratio of the molar content of lead chloride and silver chloride to the molar content of carbonic acid is 1.12:1.2, and a chemical reaction occurs under gentle stirring to obtain lead carbonate, silver carbonate, sodium chloride and elemental A mixture of sulfur; the mixture containing lead carbonate, silver carbonate, sodium chloride and elemental sulfur is roughly filtered through filter one (2) to obtain a clarifie...

Embodiment 3

[0031] refer to figure 1, a method for preparing lead carbonate and silver carbonate mixture with lithopone gained waste slag, comprising the following specific steps: weighing 500kg of lithopone gained waste slag, converting lead chloride content wherein to 173.15kg, and its molar content is : 529.51 moles; the silver chloride content is 17.5kg, and its molar content is: 121.95 moles, and it is ground into 80-120 mesh coarse powder, puts into corrosion-resistant reactor one (1) together with carbonic acid, makes corrosion-resistant reaction In the container, the ratio of the sum of the molar content of lead chloride and silver chloride to the molar content of carbonic acid is 1.12:0.8, and a chemical reaction occurs under gentle stirring to obtain lead carbonate, silver carbonate, sodium chloride and elemental A mixture of sulfur; the mixture containing lead carbonate, silver carbonate, sodium chloride and elemental sulfur is roughly filtered through filter one (2) to obtain ...

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Abstract

The invention provides a method for preparing a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production. The method comprises making the waste residue gained from the lithopone production react with carbonic acid, to obtain a mixture containing the lead carbonate, the silver carbonate and elemental sulfur; obtaining clarifying fine emulsion and an elemental sulfur filter cake, after coarse filtration of the mixture; obtaining the elemental sulfur product, after deep processing of the elemental sulfur filter cake; obtaining a filter cake containing the lead carbonate and the silver carbonate, and sodium chloride solution, after fine filtration of the obtained clarifying fine emulsion; obtaining a mixed product of the lead carbonate and the silver carbonate, after washing, drying and crashing the filter cake containing the lead carbonate and the silver carbonate; distilling the sodium chloride solution to sodium chloride saturated solution and cooling; and obtaining the sodium chloride product.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of waste residue obtained from producing lithopone, in particular to a method for preparing a mixture of lead carbonate and silver carbonate by using waste residue obtained from producing lithopone 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 i...

Claims

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Application Information

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IPC IPC(8): C01G21/14C01G5/00C01D3/04C01B17/027
Inventor 王嘉兴
Owner 王嘉兴
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