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Method used for preparing polymeric ferric sulfate from sulfuric acid waste liquid

A technology for polymerizing ferric sulfate and sulfuric acid waste liquid, applied in the direction of ferric sulfate, etc., can solve the problems of waste of resources, ecological environment hazards, water body and soil acidification, etc., and achieve the effect of saving resources

Inactive Publication Date: 2015-12-09
TONGLING HAILING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, a large amount of sulfuric acid waste liquid is produced in the industry. If the sulfuric acid waste liquid is discharged into the environment without treatment, it will not only acidify the water body and soil, cause harm to the ecological environment, but also waste a lot of resources.

Method used

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  • Method used for preparing polymeric ferric sulfate from sulfuric acid waste liquid

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Embodiment 1

[0019] A kind of method utilizing sulfuric acid waste liquid to prepare polyferric sulfate, comprises the following steps:

[0020] (1) Adding the sulfuric acid waste liquid with a concentration of 13% in the batching tank, and then according to the mass ratio H 2 SO 4 :FeSO 4 =1:1.6 ratio adds ferrous sulfate heptahydrate, mixes batching; Described ferrous sulfate heptahydrate is the powdered solid of centrifugal dehydration after removing impurity through hydrolysis;

[0021] (2) After the batching is completed, put it into the closed reaction kettle, slowly add sodium nitrite into the reaction kettle according to the ratio of 2kg per ton of product for polymerization reaction, add sodium nitrite in three to four times, and react when adding The pressure of the kettle is constant, and oxygen is introduced at the same time, and the speed of oxygen injection is such that the pressure of the reactor is maintained at 0.05MPa;

[0022] (3) When the temperature of the reaction ...

Embodiment 2

[0024] A kind of method utilizing sulfuric acid waste liquid to prepare polyferric sulfate, comprises the following steps:

[0025] (1) Adding the sulfuric acid waste liquid with a concentration of 20% in the batching tank, and then according to the mass ratio H 2 SO 4 :FeSO 4 =The ratio of 1:2 adds ferrous sulfate heptahydrate, mixes batching; Described ferrous sulfate heptahydrate is the powdered solid of centrifugal dehydration after removing impurity through hydrolysis;

[0026] (2) After the batching is completed, put it into the closed reaction kettle, and slowly add sodium nitrite into the reaction kettle at a rate of 5kg per ton of product to carry out polymerization reaction. When adding, the pressure of the reaction kettle is constant, and oxygen is introduced at the same time , the oxygen dosing speed is to maintain the pressure of the reactor at 0.1MPa; after adding sodium nitrite twice, take a sample to test the ferrous content, determine the amount of sodium ni...

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Abstract

The invention discloses a method used for preparing polymeric ferric sulfate from sulfuric acid waste liquid. The method comprises following steps: (1) sulfuric acid waste liquid with a concentration ranging from 13 to 23% is delivered into a material tank, green vitriol is added at a H2SO4:FeSO4 ratio of 1:1.6-2, and an obtained mixture is mixed; (2) the mixture is delivered into a sealed reaction vessel, sodium nitrite is added into the reaction vessel slowly for polymerization, wherein each ton of the mixture is provided with 2 to 5kg of sodium nitrite, sodium nitrite is added in three to four times, the pressure of the reaction vessel is maintained to be constant in sodium nitrite adding, oxygen is added, and oxygen adding speed is controlled to as to maintain the pressure of the reaction vessel to be 0.05 to 0.1MPa; and (3) when the temperature of the reaction vessel is increased to 75 to 80 DEG C, sampling is carried out so as to measure the content of green vitriol, and polymeric ferric sulfate finished product is obtained when the content of green vitriol is lower than 0.1%. According to the method, polymeric ferric sulfate is prepared by taking sulfuric acid waste liquid as a raw material, a large amount of resource is saved, the method can be widely applied to waste water treatment of the fields such as chemical engineering, printing, medicine preparation, and town domestic sewage, and wastes are treated with wastes.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a method for preparing polymerized ferric sulfate from sulfuric acid waste liquid. Background technique [0002] The molecular formula of polyferric sulfate is [Fe2(OH)n(SO4)3-0.5n]m, which is a reddish-brown liquid, a composite polymer with a huge molecular structure, strong adsorption capacity, and better water purification effect than All traditional inorganic water purifiers; widely used in the purification of urban drinking water, industrial circulating water, chemical industry, petroleum, mining, papermaking, printing and dyeing, brewing, steel, coal gas, paint, leather, pharmaceuticals, food, electroplating Purification and sludge dehydration of industrial wastewater and urban domestic sewage in other industries. At present, a large amount of sulfuric acid waste liquid is produced in the industry. If the sulfuric acid waste liquid is discharged into the environmen...

Claims

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Application Information

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IPC IPC(8): C01G49/14
CPCC01G49/14
Inventor 章智史磊
Owner TONGLING HAILING ENVIRONMENTAL PROTECTION TECH CO LTD
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