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Wet production processs and apparatus of granular ferrous sulfate monohydrate

A ferrous sulfate and water ferric sulfite technology, applied in the direction of ferric sulfate, can solve the problems of packaging, storage and transportation, inconvenient use, easy oxidation in the production process, small crystals, etc., and achieve easy equipment design or selection, packaging And the effect of convenient storage and transportation, moderate particle size

Inactive Publication Date: 2007-06-27
梁永洪 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method that can overcome the shortcomings of the existing ferric sulfite monohydrate, such as fine crystals, easy oxidation in the production process, flying dust during use, inconvenient packaging, storage and transportation, and inconvenient use, and can stabilize the active ingredients in the product. Granular ferrous sulfate monohydrate with iron content and production method

Method used

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  • Wet production processs and apparatus of granular ferrous sulfate monohydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Pour ferrous sulfite heptahydrate, a by-product of the titanium dioxide factory, into the washing filter tank 1 and wash away surface impurities with clear water. After stirring, let it stand for 10-20 minutes, remove the floating matter on the top, drain the impurities settled at the bottom, then filter and drain the water to obtain pure ferric sulfite heptahydrate. Part of the ferric sulfite heptahydrate can be recovered by concentrating the filtered water. Put the above-mentioned cleaned ferric sulfite heptahydrate into the dissolution reactor and heat it to 70-100°C to melt, then cool it down to below 65°C, send the recrystallized material to the centrifuge for centrifugation, and then boiler hot gas dryer Indirect heating; obtaining ferric sulfite monohydrate powder (weight content) with an iron content of 30-32%, ferric sulfite monohydrate without free water, and returning the mother liquor separated by the centrifuge to the dissolution reactor for reuse. Then us...

Embodiment 2

[0040] Pour ferrous sulfite heptahydrate, a by-product of the titanium dioxide factory, into the washing filter tank 1 and wash away surface impurities with clear water. After stirring, let it stand for 10-20 minutes, remove the floating matter on the top, drain the impurities settled at the bottom, then filter and drain the water to obtain pure ferric sulfite heptahydrate. Part of the ferric sulfite heptahydrate can be recovered by concentrating the filtered water. Put the above-mentioned cleaned ferric sulfite heptahydrate into the dissolution reactor and heat it to 70-100°C to melt, then cool it down to below 65°C, send the recrystallized material to a centrifuge for centrifugation, and then dry it in an airflow dryer Obtain iron content is 30-32% ferric sulfite monohydrate powder (weight content), does not contain free water ferric sulfite monohydrate, and the mother liquor separated by the centrifuge returns to the dissolution reactor for reuse. Then use a tablet machine...

Embodiment 3

[0042] Pour ferrous sulfite heptahydrate, a by-product of the titanium dioxide factory, into the washing filter tank 1 and wash away surface impurities with clear water. After stirring, let it stand for 10-20 minutes, remove the floating matter on the top, drain the impurities settled at the bottom, then filter and drain the water to obtain pure ferric sulfite heptahydrate. Part of the ferric sulfite heptahydrate can be recovered by concentrating the filtered water. Put the above-mentioned cleaned ferric sulfite heptahydrate into the dissolution reactor and heat it to 70-100°C to melt, then cool it to below 65°C, send the recrystallized material to a centrifuge for centrifugation, and then heat it with microwave for 3-10 Dry in 10 minutes; Obtain iron content and be the ferric sulfite monohydrate powder (weight content) of 30-32%, do not contain the ferric sulfite monohydrate of free water, the mother liquor separated by the centrifuge returns to the dissolution reactor for re...

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Abstract

The present invention relates to production process and apparatus of granular ferrous sulfate monohydrate. The technological process includes the following steps: water washing and filtering ferric sulfite heptahydrate to purify, dissolving via heating, re-crystallizing, centrifugal drying to obtain ferric sulfite monohydrate powder with Fe content of 30-32 wt%, and returning the centrifugal mother liquid to the dissolving reactor; tabletting the ferric sulfite monohydrate powder, crushing, 2-60 mesh sieving in a vibrating sieve and packing.

Description

technical field [0001] The invention relates to a production method of a ferrous sulfate monohydrate product, in particular to a production method and equipment of granular ferrous sulfate monohydrate produced by using ferrous sulfate, a by-product of a titanium dioxide factory or a steel plant, as a raw material. Background technique [0002] Ferrous sulfate monohydrate, molecular formula FeSO 4 ·H 2 O, traits: off-white to beige powder, with astringent taste. Mainly composed of FeSO 4 ·H 2 O composition with a small amount of FeSO 4 4H 2 O, more difficult to oxidize, easier to preserve than crystalline ferrous sulfate, the aqueous solution is acidic and turbid, gradually forming a yellow-brown precipitate. It absorbs water in humid air to form trihydrate or heptahydrate salt, and it will not lose water when heated to 120°C. Boil with water and transform into basic sulfate, slowly soluble in cold water (16.6g / 100ml, 20°C), dissolve rapidly when heated, insoluble in e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14
Inventor 梁永洪龙庆国
Owner 梁永洪
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