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A method for preparing low-iron polyaluminum sulfate by using aluminum-containing waste sulfuric acid mother liquor

A technology for polymerizing aluminum sulfate and sulfuric acid mother liquor, applied in aluminum sulfate, aluminum sulfur compounds and other directions, can solve the problems of production steps, many controls, affecting the quality and application scope of polyaluminum sulfate products, and achieves high production efficiency and product insoluble matter. The effect of extremely high content and easy availability of raw materials

Active Publication Date: 2017-08-01
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103936041A (a method for recycling aluminum-containing waste sulfuric acid) is to use scrap steel slag discharged in the steelmaking process to process aluminum-containing waste sulfuric acid, and recycle alumina and iron oxide therein. There are relatively many production steps and controls, and the operation has certain limitation
There are also papers that directly use aluminum-containing waste sulfuric acid to produce polyaluminum sulfate products, but the iron ions and heavy metal ions contained in the waste acid raw materials seriously affect the quality and application range of the final polyaluminum sulfate products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 200 kg of aluminum-containing waste sulfuric acid mother liquor (aluminum content 8%, acidity 3%) and 0.2 kg of thiram into the reaction kettle, start stirring, and after reacting for half an hour, carry out filter press filtration and separation to obtain reaction liquid I.

[0019] Add 240kg of industrial sulfuric acid with a mass fraction of 32.7% and 50kg of calcium aluminate powder (aluminum content of 50.03%, calcium oxide 35.76%, base degree of 83.92%) into the pretreatment reactor in turn, stirring for 1 hour, calcium aluminate All the powder is dissolved to obtain reaction solution II.

[0020] Add reaction liquid I and reaction liquid II into the reactor at the same time, turn on the stirring, heat up to 70°C and keep the temperature for the reaction. When the basicity in the kettle is 6%, add 0.2kg of citric acid, and then continue the polymerization reaction to control The reaction temperature is 50-70 DEG C, the reaction is 3 hours, and it is separated by pr...

Embodiment 2

[0022] Add 100 kg of aluminum-containing waste sulfuric acid mother liquor (aluminum content 4%, acidity 9%) and 0.1 kg of thiram into the reaction kettle, start stirring, and after reacting for half an hour, carry out filter press filtration and separation to obtain reaction liquid I.

[0023] Add 105kg of 42% industrial sulfuric acid and 31kg of calcium aluminate powder (aluminum content 50.03%, calcium oxide 35.76%, base degree 83.92%) into the pretreatment reactor successively, and stir for 0.8 hours. Calcium aluminate All the powder is dissolved to obtain reaction solution II.

[0024] Add reaction liquid I and reaction liquid II into the reactor at the same time, turn on the stirring, heat up to 70℃ and keep the temperature for the reaction. When the basicity in the kettle is 6%, add 0.1kg tartaric acid, and then continue the polymerization reaction to control the reaction The temperature is 50-70 DEG C, the reaction is for 2 hours, and it is separated by filter press and coo...

Embodiment 3

[0026] Add 300kg of aluminum-containing waste sulfuric acid mother liquor (aluminum content: 6%, acidity: 8%) and 0.3kg of thiram into the reaction kettle, start stirring, and after reacting for half an hour, carry out filter press filtration and separation to obtain reaction liquid I.

[0027] Add 220kg of industrial sulfuric acid with a mass fraction of 53.5% and 80kg of calcium aluminate powder (aluminum content of 50.03%, calcium oxide 35.76%, base degree of 83.92%) into the pretreatment reactor in turn, stirring for 1 hour, calcium aluminate All the powder is dissolved to obtain reaction solution II.

[0028] Add reaction liquid I and reaction liquid II into the reaction kettle at the same time, turn on the stirring, heat up to 70℃ and keep the temperature for the reaction. When the base degree in the kettle is 6%, add 0.3kg tartaric acid-sodium tartrate, and then continue the polymerization reaction , Control the reaction temperature at 50-70°C, react for 3 hours, filter and ...

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Abstract

The invention relates to a method for preparing low-iron polyaluminium sulfate by using an aluminiferous waste sulfuric acid mother liquor. The method includes the following steps: adding aluminiferous waste sulfuric acid mother liquid into a pretreatment reactor, adding a heavy metal capturing agent, and conducting filter pressing separation to obtain a reaction liquid I; mixing and reacting industrial sulfuric acid and calcium aluminate powder according to a certain proportion to obtain a reaction solution II; conducting an alkalization polymerization on the reaction liquid I and reaction liquid II under a certain temperature, adding a stabilizer, then continuing the polymerization reaction, conducting filter pressing separation and cooling to obtain a liquid low-iron polyaluminium sulfate product. The invention has the beneficial effects of easily available raw materials, simple process operation, safe and environment-friendly production, high production efficiency, extremely low content of insoluble matters in the product, extremely low iron content in the product, high added value, application to fine paper manufacturing, special requirements for water treatment, production of high-grade titanium dioxide and application as a high filler.

Description

Technical field [0001] The invention belongs to the technical field of solid waste disposal, resource recycling and development of circular economy, and relates to a method for preparing low-iron polyaluminum sulfate by using aluminum-containing waste sulfuric acid mother liquor. Background technique [0002] With the rapid development of the national economy, a large amount of aluminum-containing waste sulfuric acid is produced during the pickling process of aluminum metal products. The waste liquid contains sulfuric acid with different mass fractions and a large amount of A1. 3+ , Followed by Fe 3+ , Fe 2+ , Pb 2+ , Ni 2+ The presence of other heavy metal ions. How to efficiently and rationally dispose of aluminum-containing waste sulfuric acid is an important part of environmental protection work. With people's cognition of their own living environment and non-renewable resources, the reuse of aluminum-containing waste sulfuric acid can achieve the purpose of clean living envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/74
Inventor 蒋银峰郑晓冬王桂玉
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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