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Production method of blocky polyferric chloride solid

A polyferric chloride, production method technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of affecting the coagulation effect, poor economy, and equipment investment costs High problems, to achieve the effect of water solubility, clear and translucent, easy control of process conditions, easy transportation and storage

Inactive Publication Date: 2020-05-19
3R ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few domestic and foreign reports on polyferric chloride solid production process, and the polyferric chloride solid product sold on the market has low purity, and the iron content of the product is low, and the aluminum content is high; The polyferric chloride solid has poor water solubility. In the process of use, the product contains more water-insoluble substances, and its effective content becomes lower, which affects the coagulation effect; although the vacuum drying technology alleviates the iron ion to a certain extent Hydrolysis tendency, but there is still a certain amount of water-insoluble matter, and the production efficiency of this process is low, and the economy is poor
All in all, the production of solid polyferric chloride has the problems of low purity and poor water solubility; the investment cost of equipment in the process is high and the production efficiency is low, which limits the development of solid polyferric chloride

Method used

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  • Production method of blocky polyferric chloride solid
  • Production method of blocky polyferric chloride solid

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preparation example Construction

[0022] Such as figure 1 Shown, the preparation method of the massive polyferric chloride solid of one embodiment mainly comprises the following steps:

[0023] Step S110, adding hydrochloric acid solution and ferrous chloride solid into the reaction stirred tank, starting the stirring, adding a stabilizer, and oxidizing to obtain a polyferric chloride solution, the mass fraction of iron ions is 20.5% to 23.5%, and the mass fraction of ferrous ions is The fraction is less than or equal to 0.01%, and the mass fraction of the basicity is 5% to 20%.

[0024] In this embodiment, the raw materials directly affect the purity of the product. The present invention selects high-purity solid ferrous chloride and hydrochloric acid solution as raw materials, and does not introduce other impurity ions, thereby reducing the purity of the product. The iron content of the raw material is relatively high, and the iron content of the polyferric chloride liquid obtained by oxidation is also rela...

Embodiment 1

[0031] Add the hydrochloric acid solution of 1200g solid ferrous chloride and 300g in the reactor, open stirring speed and be 150r / min, add appropriate stabilizer phosphoric acid, sodium chlorate oxidation makes polyferric chloride solution (Fe: 21.02%, Fe 3+ : 0.01%, B: 13.16%); use cold water to quickly cool down the material, until the temperature of the polyferric chloride solution is reduced to 25°C, add 8g of powdery ferric chloride solid seed crystals, and continue stirring for 40 minutes to obtain the solid content It is a 30% polyferric chloride solution; it is then transferred to a square plastic mold, and placed in a 20°C environment for 4.5 hours to obtain block solid polyferric chloride (Fe: 21.02%, Fe 2+ : 0.01%, B: 13.16%, water-insoluble matter: 0.05%).

Embodiment 2

[0033] Add the hydrochloric acid solution of 1200g solid ferrous chloride and 200g in the reactor, start stirring speed and be 180r / min, add appropriate stabilizer sodium dihydrogen phosphate, hydrogen peroxide oxidation makes polyferric chloride solution (Fe: 22.38% , Fe 3+ : 0.01%, B: 17.16%); use cold water to quickly cool down the material, until the temperature of the polyferric chloride solution is reduced to 26°C, add 4g of powdery polyferric chloride solid seed crystals, and continue to stir for 50 minutes to obtain a solid containing Amount of 45% polyferric chloride solution; then transfer it to a hexagonal plastic mold, and place it for 5 hours at a temperature of 25°C to obtain solid polyferric chloride (Fe: 22.38%, Fe 2+ : 0.01%, B: 17.16%, water-insoluble matter: 0.03%).

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Abstract

The invention relates to a production method of a blocky polyferric chloride solid. The method comprises the following steps: adding a hydrochloric acid solution and a ferrous chloride solid into a reaction kettle, starting stirring, adding a stabilizer, and carrying out oxidation reaction to obtain a polyferric chloride solution; rapidly stirring and cooling the polyferric chloride solution untila material temperature is 25-27 DEG C, then adding seed crystals, and continuing stirring for 30-90 minutes to obtain a polyferric chloride solution containing crystal grains; and transferring the polyferric chloride solution containing the crystal grains into a polygonal plastic mold, and carrying out standing for 4-6 hours in a low-temperature environment so as to obtain the blocky polyferric chloride solid. The method is simple in process and convenient to operate; the obtained blocky polyferric chloride solid is low in impurity content, relatively high in iron content, soluble in water, clear and transparent in appearance and relatively high in practical value; and the solid is easy to transport and store and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of compound preparation, in particular to a method for producing block polyferric chloride solid. Background technique [0002] As a new type of high-efficiency inorganic polymer iron-based flocculant, polyferric chloride mainly utilizes the hydrolysis characteristics of iron ions, that is, iron ions are connected through hydroxyl bridges to form polymers, so that it has strong adsorption, electrical neutralization and bridging It can improve the coagulation effect, reduce corrosion and reduce damage to structures, and can be widely applied to the actual requirements of sewage treatment. The main problem facing the development of polyferric chloride is its poor stability, short storage time, easy to form precipitation or sol phenomenon, resulting in product performance failure. In recent years, a variety of production methods have been developed for polyferric chloride liquid, and the product performance an...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 吴勇基樊文星丁德才王权永
Owner 3R ENVIRONMENTAL TECH CO LTD