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A kind of preparation method of solid iron sulfate

A technology of solid sulfuric acid and ferrous sulfate, applied in the fields of ferric sulfate, chemical instruments and methods, water treatment parameter control, etc., can solve the problems of high water insoluble matter, low product content, environmental pollution, etc., and achieve fast sedimentation speed and effect. Significant, cost-reducing effect

Active Publication Date: 2018-07-24
浙江合众环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses a large amount of nitric acid as an oxidant, the cost of preparing the product is relatively high, and a large amount of nitrogen oxides are formed after reduction of nitric acid, which will pollute the environment
[0004] Chinese patent CN 100335420 discloses a production method of solid composite polyferric sulfate, which reacts sulfuric acid slag, water, concentrated sulfuric acid and additives to produce solid composite polyferric sulfate, which reduces production costs by using waste, but the invention uses Iron sulfate ore slag is removed, and the intermediate link of preparation fails to separate the slag that does not react with sulfuric acid, which will lead to the disadvantages of low product content and high water insoluble matter

Method used

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  • A kind of preparation method of solid iron sulfate
  • A kind of preparation method of solid iron sulfate
  • A kind of preparation method of solid iron sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 180kg of 98% sulfuric acid into the reactor, then add 1000kg of titanium dioxide with an iron content of about 17% by-product ferrous sulfate to the reactor, and start stirring; dissolve 10kg of 99% sodium nitrite in 10kg The prepared catalyst is slowly added dropwise into the reactor, and the industrial oxygen valve is opened to continuously feed oxygen into the reactor after sealing the reactor. When the oxygen consumption reaches 18kg and the reaction time reaches 4 hours, the reaction When the temperature reaches about 80°C, take a sample to detect Fe 2+ If the mass fraction is less than 0.1%, add 1.0g of sodium carbonate, a crystallization and curing agent, and finally put the product into an open container, the product is about 2 / 3 of the height of the open container, and then put the open container containing the product into the environment In a system with a temperature of about 35°C, natural crystallization and drying for 24 hours can obtain a mass fractio...

Embodiment 2

[0027] Add 190g of 93% sulfuric acid into the reactor, then add 300g of industrial ferrous sulfate heptahydrate with an iron content of about 19% and 380g of industrial ferrous sulfate monohydrate with an iron content of about 30% to the reactor, start Stir; use 40g of nitric acid with a content of about 50% as a catalyst, slowly drop into the reactor, close the reactor, open the industrial liquid oxygen valve to vaporize it into oxygen, and continuously feed oxygen into the reactor. When the mass reaches 18g, after the reaction time reaches 2h, and the reaction temperature reaches about 70°C, take a sample to detect Fe 2+ If the mass fraction is less than 0.1%, add 0.8g of ammonium carbonate as a crystallization and curing agent, and finally put the product into an open container, the product is about 2 / 3 of the height of the open container, and then put the open container containing the product into the environment In a system with a temperature of about 25°C, natural crysta...

Embodiment 3

[0032] Add 220kg of 80% sulfuric acid into the reactor, then add 790g of industrial ferrous sulfate tetrahydrate with an iron content of about 21.5% to the reactor, and start stirring; add 20g of 99% industrial sodium nitrate and 99% Dissolve 20g of industrial sodium nitrite in 40g of water as a catalyst, then slowly add the prepared catalyst dropwise into the reactor, leave a small outlet hole in the reactor to lead to the tail gas absorption device, and pass compressed air into the reactor, When the volume of air introduced under the standard atmospheric pressure is 400 cubic meters, after the reaction time reaches 6 hours, and the reaction temperature reaches about 90°C, samples are taken to detect Fe 2+ If the mass fraction is less than 0.1%, add 0.8g of crystallization and curing agent calcium bicarbonate, and finally put the product into an open container, the product is about 2 / 3 of the height of the open container, and then put the open container containing the product ...

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Abstract

The invention discloses a preparation method of solid ferric sulfate. The method comprises the following steps: putting 150 to 250 parts by weight of sulfuric acid into a reactor, adding 300 to 1000 parts by weight of ferrous sulfate in the reactor, stirring, adding dropwise slowly 10 to 80 parts by weight of catalyst, introducing oxygen, reacting for 4 to 15h in a closed way, after the temperature is increased to 50 to 90 DEG C, when the mass fraction of Fe<2 +> is less than 0.1% by sample examination, adding a crystallization curing agent and then reacting for 0.2 to 1.0h, placing the resulting feed liquid in the environment at a temperature of room temperature to 40 DEG C, naturally drying to obtain solid ferric sulfate. The preparation method provided by the invention can be used for pretreatment, decolorization, deodorization and COD, heavy metal and algae removal in water treatment, treatment of papermaking, printing and dyeing, oily sewage and the like, and has the advantages of obvious effects, large alum and fast settling speed.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry, and in particular relates to a preparation method of solid ferric sulfate. Background technique [0002] As an inorganic salt, ferric sulfate is widely used as water treatment chemicals and other chemical raw materials. Most of the products on the market are liquid products and a small amount of solid products. The liquid product is prepared by the ferrous sulfate oxidation method. The oxidant is generally nitric acid or sodium chlorate, which has serious pollution problems of nitrogen oxides and chlorine gas, and the product contains nitrate, nitrite or chlorine gas; another process uses It is prepared by reacting sulfuric acid with a certain concentration and iron-containing ore powder. The product has high free acid, consumes a lot of sulfuric acid during preparation, and has the problem of high cost; liquid products are inconvenient to transport, not easy to store, corrosive, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14C02F1/52C02F101/20C02F103/28
CPCC01G49/14C01P2006/80C02F1/5245C02F2101/20C02F2103/28C02F2209/08C02F2209/10C02F2303/02
Inventor 黄伟农费凡费雄略任海博蔡樱英俞俐珍
Owner 浙江合众环保科技有限公司
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