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Method for preparing low zinc low iron clarification rongalite

A technology for carving white blocks and zinc powder, which is applied in chemical instruments and methods, alkali metal sulfites/sulfites, sodium/potassium compounds, etc. question

Inactive Publication Date: 2009-01-28
湖南中成化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above methods can reduce the zinc ion content of the carved stone to below 10ppm, and at the same time, the iron in the carved stone cannot be reduced to below 10ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A certain batch of raw material diaobai solution with a purity greater than 95% was taken and vacuum filtered. The total amount of zinc ions in the solution measured by the EDTA complexometric titration method in the filtrate is 91 mg / L. Take 1 liter of filtrate in a stirred reactor, and add 8-hydroxyquinoline solution containing 410.0 mg of 8-hydroxyquinoline (4.50 times the mass of zinc ions) under stirring. After stirring for 10 minutes, take a sample and filter, use chrome black T as the color developer and an ammonia-ammonium chloride buffer solution with pH=10, and measure the residual zinc ion content in the filtrate by colorimetry. The measured residual zinc ion content was 5-6 mg / L. Add 8-hydroxyquinoline solution containing 8-12 mg of 8-hydroxyquinoline to the solution in the reactor, continue to stir for 10 minutes, then sample and filter, then use chrome black T as the color developer and ammonia with pH=10 -Ammonium chloride buffer solution, colorimetric ...

Embodiment 2

[0017] A certain batch of raw material diaobai solution with a purity greater than 95% was taken and vacuum filtered. The total amount of zinc and iron ions in the solution measured by the EDTA complexometric titration method in the filtrate is 78.0 mg / L. Take 1 liter of filtrate in a stirred reactor, and add 8-hydroxyquinoline solution containing 350.0 mg of 8-hydroxyquinoline (4.5 times the mass of zinc ions) under stirring. After stirring for 10 minutes, take a sample and filter, use chrome black T as the color developer and an ammonia-ammonium chloride buffer solution with pH=10, and measure the residual zinc ion content in the filtrate by colorimetry. The measured residual zinc ion content is 6-7 mg / L. Add 8-hydroxyquinoline solution containing 14 mg of 8-hydroxyquinoline to the solution in the reactor, continue to stir for 10 minutes, then sample and filter, then use chrome black T as the developer and the ammonia-chlorine of PH=10 ammonium chloride buffer solution, an...

Embodiment 3

[0019] A certain batch of raw material diaobai solution with a purity greater than 95% was taken and vacuum filtered. The total amount of zinc and iron ions in the solution measured by the EDTA complexometric titration method in the filtrate is 117.0 mg / L. Take 1 liter of the filtrate in a stirred reactor, and add 8-hydroxyquinoline solution containing 526.0 mg of 8-hydroxyquinoline (4.5 times the mass of zinc ions) under stirring. After stirring for 10 minutes, take a sample and filter, use chrome black T as the color developer and an ammonia-ammonium chloride buffer solution with pH=10, and measure the residual zinc ion content in the filtrate by colorimetry. The measured residual zinc ion content is 2-3 mg / L, which meets the control requirements. Stirring was stopped, and the precipitate was aged for 2 to 3 hours, and then the precipitate was filtered off. The filtrate was colorless and transparent. The filtrate is concentrated at a vacuum degree of -0.085 to -0.095Mpa a...

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PUM

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Abstract

The invention relates to a method for preparing low-zinc low-iron clear rongalite, which comprises the steps that: rongalite solution is used as a raw material and quinoline organic precipitator is used for precipitating zinc and ferrous ions in the solution before concentration; then, sampling and filtering are carried out, ammonia-ammonium chloride with the pH of 10 is used for buffering the solution with Eriochrome black T as a visualization reagent, and the content of the residual zinc ions in filtrate is measured by colorimetry; after the measured value meets the control requirement of 1 to 3mg / L, stirring is stopped, after precipitation and aging are carried out for 2 to 3 hours, precipitates are filtered away and then the filtrate is colorless and transparent; then, cooling for crystallization, crushing and packaging are carried out for obtaining the products of the clear rongalite with zinc and ferrous contents lower than 10PPm after the filtrate is concentrated to the content of over 98 percent at a vacuum level ranging from minus 0.085 to minus 0.095mPa and temperature lower than 75 DEG C. The invention has the advantages that the products prepared by the method have good stability and zinc and ferrous contents of lower than 10PPm, thus meeting special requirements on rongalite products by industries such as medicine and rubber, etc.

Description

technical field [0001] The invention relates to a method for preparing a low-zinc and low-iron clarified glyph block. Background technique [0002] The scientific name of Diaobai block is sodium sulfoxylate dihydrate formaldehyde, and it is produced by two methods in industry: zinc powder-pyroxia-formaldehyde method (referred to as one-step method) and zinc powder-sulfur dioxide-formaldehyde method (referred to as three-step method) ), the synthesized diaobai solution contains a certain amount of zinc ions and iron ions, so that the general industrial diaobai obtained from the final concentration contains 100-300ppm of zinc ions and 30-60ppm of iron ions. This makes common industrial engraving blocks limited in some special application areas (such as medical and rubber industries). In addition to meeting the technical specifications (content, appearance, and sulfide) of common carved stones, the stones required for these special application fields also require low zinc and ...

Claims

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Application Information

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IPC IPC(8): C07F1/04C01D5/00C01D13/00
Inventor 孙伏云邓帛辉邓伟国
Owner 湖南中成化工有限公司
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