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Comprehensively utilizing new process for ferrous sulfate

A ferrous sulfate and process technology, applied in the new technology field of comprehensive utilization of ferrous sulfate, can solve the problems of large energy consumption, reduced environmental pollution, limited amount of ferrous sulfate, etc., and achieves large equipment investment, poor economic benefits, low cost effect

Inactive Publication Date: 2006-03-22
刘应兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Except that a small amount of ferrous sulfate can be used directly, (2) to (8) these processes are all aimed at reclaiming the iron element in the green vitriol. As a result, it takes a lot of energy to remove the water of crystallization, and it takes Consume high-priced alkali raw materials and produce new sulfates. The recovery of these sulfates increases the cost, and new pollution will be caused if they are not recovered.
The economic benefits of comprehensive utilization are not ideal
Ferrous sulfate is a low-value product. Due to the limitation of transportation distance, the amount of ferrous sulfate directly sold by most titanium dioxide factories is very limited.
A large amount of ferrous sulfate in the titanium dioxide industry is landfilled as waste or washed away directly with water, causing environmental pollution and making the titanium dioxide industry a well-known polluting industry; the ferrous sulfate contained in the waste liquid after pickling steel Iron is harder to use
There are foreign manufacturers who mix ferrous sulfate with lime to landfill, so that the degree of environmental pollution is reduced, but the cost is increased, and ferrous sulfate is not used.

Method used

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  • Comprehensively utilizing new process for ferrous sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh FeSO by-product of titanium dioxide plant 4 ·7H 2 1000 grams of O (95% content) is put into a plastic bucket, add a small amount of water to become semi-fluid, slowly pour CaCl2 (concentration 300 grams per liter) solution 1300 milliliters in the bucket, fully stir for 2 hours, filter; (FeCl 2 Solution) preservation, the filter residue (1) is washed and exposed to the sun until dry; Weigh 209 grams of quicklime (calcium oxide content is 91%) in an aluminum bucket, add an appropriate amount of water to make it milky, and the above filtrate Slowly pour into this milk of lime, stir with compressed air, keep stirring for 48 hours, filter; the filtrate (CaCl 2 solution) was retained, and the filter residue (2) was washed with water and then exposed to the sun until dry.

[0057] After weighing filter residue (1) is 570 grams, CaSO 4 2H 2 O content is 97%, filter residue (2) 290 grams, Fe 2 o 3 The content is 90%, meeting the raw material requirements for ironmak...

Embodiment 2

[0059] Weigh FeSO from titanium dioxide factory 4 ·7H 2 O 1000 grams, place plastic barrel, add a small amount of tap water, partly dissolve into semi-flowing state; The filtrate (CaCl 2 solution) are all poured into the plastic barrel, and then add the CaCl in the example 1 2 (concentration 300 g / L) solution 30 ml, stirred for 3 hours and then filtered, the filter residue (1) was washed with water and then dried in an oven at 80°C; the filtrate was placed in an aluminum bucket and a small amount of quicklime was added to adjust the pH value to 3, and the precipitate was filtered off , add 209 grams of quicklime to the filtrate, stir vigorously with compressed air, and place the aluminum bucket in the sun for 48 hours, then filter, and the filter residue (2) is dried in an oven at 80°C after being washed with water, and the filtrate is used To process the next batch of ferrous sulfate.

[0060] Obtain filter residue (1) after drying——572 grams of gypsum, CaSO 4 2H 2 O con...

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Abstract

The technological process of utilizing ferrous sulfate comprehensively in preparing industrial gypsum and iron with lime as main material has the key point of bridging effect of calcium chloride. The technological process includes the steps of: dissolving ferrous sulfate in water, adding calcium chloride solution to produce calcium sulfate precipitate and ferrous chloride solution, filtering to separate calcium sulfate precipitate, adding lime milk into the filtrate and heating via stirring to produce ferric hydroxide precipitate, filtering, stoving the filter slag to obtain ferric oxide, and returning the filtrate. The obtained ferric oxide may be used in smelting iron, preparing iron oxide red, etc. The present invention has relatively low cost of utilizing ferrous sulfate.

Description

technical field [0001] The invention relates to a comprehensive utilization process of waste, which refers to ferrous sulfate: including FeSO 4 , FeSO 4 ·7H 2 O or FeSO 4 ·H 2 O and other forms of crystal water come from sulfuric acid titanium dioxide factory or waste liquid after pickling steel in steel factory. The present invention can also be expressed as utilizing ferrous sulfate to prepare industrial gypsum and iron oxide products. The present invention utilizes solution characteristic to FeSO 4 SO in 4 2+ and Fe 2+ Precipitate in fractions to make CaSO 4 2H 2 O precipitates and Fe(OH) 2 Precipitation, Fe(OH) 2 The precipitate is eventually converted to iron oxides. Calcium sulfate precipitation (industrial gypsum) can be used to produce cement or other gypsum products, and iron oxides can be used as raw materials for steel plants, or for the production of iron-based pigments, etc. technical background [0002] Ferrous sulfate is the main by-product in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02
Inventor 刘应兵
Owner 刘应兵
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