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Production method of solid polymeric ferric sulfate or ferric sulfate

A technology of polyferric sulfate and its production method, which is applied in the direction of ferric sulfate, chemical instruments and methods, water/sewage treatment, etc., to achieve the effects of reducing production costs, simple preparation methods, and low cost

Inactive Publication Date: 2017-12-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, the direct cost of drying is 300-450 yuan

Method used

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  • Production method of solid polymeric ferric sulfate or ferric sulfate
  • Production method of solid polymeric ferric sulfate or ferric sulfate

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1, under room temperature condition, add 200g ferrous sulfate heptahydrate and 38g 93% sulfuric acid solution respectively in the glass polymerization kettle. Add 2g of 65% nitric acid to the reaction kettle, then pour in oxygen at room temperature, react for 1 hour, wait until the ferrous ion is reduced to below 0.1%, add 0.03g of crystallization inducer calcium persulfate, and the oxidation reaction ends. Then in the container at room temperature, the reaction product was naturally placed for 30 hours, and then it was taken out and pulverized to obtain the iron sulfate product. The indicators of the product are as follows: total iron: 20.2 percent; free acid content: 0.3 percent; insoluble matter is less than 0.1 percent, and the particle size is less than 1 mm.

Embodiment 2

[0018] Embodiment 2, under room temperature condition, add 200g ferrous sulfate heptahydrate and 33g 93% sulfuric acid solution respectively in the glass polymerization kettle. Add 3g of 65% nitric acid to the reaction kettle, then pour in oxygen at room temperature, react for 1.5 hours, wait for the ferrous ion to drop below 0.1%, add 0.02g of crystallization inducer calcium persulfate, and the oxidation reaction ends. Then in the container at room temperature, the reaction product was allowed to stand naturally for 25 hours, and then it was taken out and pulverized to obtain the ferric sulfate product. The indicators of the product are as follows: total iron: 21.2%; basicity: 12.5%; insoluble matter is less than 0.1%, and the particle size is less than 1 mm.

Embodiment 3

[0019] Embodiment 3, under room temperature condition, add 200g ferrous sulfate heptahydrate and 39g93% sulfuric acid solution respectively in polytetrachlorethylene container. Add 2.5g of 65% nitric acid progressively to the reactor, then flush into oxygen at normal temperature, and react for 1 hour. Then in the container at room temperature, the reaction product was allowed to stand naturally for 18 hours, and then it was taken out and pulverized to obtain the ferric sulfate product. The product index is as follows: total iron: 20.1%; free acid content: 0.4%; insoluble matter is less than 0.1%, and the particle size is less than 1 mm.

[0020] Test experiment 1: with the product in embodiment 1 (total iron: 20.2%: free acid content: 0.3%) and spray drying ferric sulfate (total iron content is 21.5%, reducing Fe 2+ 0.03%) as a coagulant, dissolved and diluted to a total iron ion concentration of 11.0%. The coagulation comparison experiment was carried out by preparing kaoli...

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Abstract

The invention relates to a production method of solid polyferric sulfate or ferric sulfate. The specific steps are: at room temperature, in a closed container, uniformly mix the solid raw material ferrous sulfate heptahydrate and sulfuric acid, and drop nitric acid solution at the same time, Oxygenation and stirring under normal pressure, the heat released during the reaction will cause the reaction temperature to rise continuously, accompanied by the formation of NO and NO2, the reaction time is 0.5-2 hours, and the reaction temperature is 50-90°C, so as to complete the raw material. Oxidation and polymerization reactions. After the reaction is complete, add a crystallization inducer, take out the reactant and pulverize it, and place it for 10-72 hours to obtain a solid polyferric sulfate product; the molar ratio of ferrous sulfate heptahydrate, sulfuric acid, nitric acid and oxygen is 1:0.30-0.5: 0.001‑0.02: 0.25‑0.027. The preparation method of the invention is simple, the raw materials are easy to obtain, no drying equipment is needed, and a large amount of energy is saved; at the same time, the induction drying technology is adopted, which avoids high-temperature drying, and does not bring any negative impact on the performance of ferric sulfate or its basic salt. It has extensive development value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production method of solid polyferric sulfate or ferric sulfate. Background technique [0002] Iron Sulfate Fe 2 (SO 4 ) 3 ·XH 2 O and its basic salt or polymer polymerized iron sulfate Fe 2 (OH) n (SO 4 ) 3-n / 2 It is a yellow powder and is a widely used chemical raw material. It is easily deliquescent into a brown liquid; depending on the process of obtaining the solid, its density is between 0.6-3.0 g / cm 3 (25°C), decomposes when heated to 480°C, forming iron oxide and sulfur oxide gas. Therefore, the drying temperature of ferric sulfate is controlled below 400°C. At present, the industry uses oxidants such as chlorate, nitric acid, hydrogen peroxide, and oxygen to oxidize ferrous sulfate hot solution containing sulfuric acid to produce ferric sulfate or its polymer, which can be used as water purifier, mordant, pigment and medicine. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01G49/14C02F1/52
CPCC01G49/14C01P2004/60C02F1/5236
Inventor 李风亭张冰如
Owner TONGJI UNIV