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Process for preparing aluminum polychloride

A technology for polyaluminum chloride and aluminum waste, which is applied in the fields of aluminum chloride, aluminum halide, flocculation/precipitation water/sewage treatment, etc. It can solve the problems of waste gas pollution, hydrochloric acid is volatile, and acid mist is easy to generate, and achieves production Low cost, mild reaction, energy saving effect

Inactive Publication Date: 2009-06-17
嘉兴市环科环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technology this adopts aluminum hydroxide and hydrochloric acid to be that the method for raw material preparation has many defects, as: adopt aluminum hydroxide and hydrochloric acid as raw material, cost height; Exhaust gas pollutes the environment

Method used

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  • Process for preparing aluminum polychloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The waste hydrochloric acid liquid is added to the acid-resistant reaction kettle, and the waste aluminum is added according to the conversion of the aluminum content of the raw material, so that the aluminum content in the product is converted into alumina to 9% (w / w), and the heat generated by the exothermic reaction with hydrochloric acid makes the The temperature rises to about 80°C, and then steam is introduced to heat to a temperature of 100±5°C, and then the polymerization reaction is carried out for 4 hours, and then enters the precipitation tank, and the product obtained through natural precipitation and separation is polyaluminum chloride (Al 2 o 3 The percentage is 9%).

Embodiment 2

[0025] Aluminum content (refers to Al 2 o 3 Percentage) 4.5% (w / v) waste hydrochloric acid pickling solution is added in the acid-resistant reaction kettle, then adds aluminum content (referring to Al 2 o 3 48%) of about 150kg of bauxite reacts, and the heat generated raises the temperature to about 80°C. Use electric heating (heat transfer oil) to reach a temperature of 100±5°C, then polymerize for 3 hours, add 50kg of water appropriately, and enter Intermediate pool, and then separated by plate-and-frame filter press to separate the aluminum content of the product (referring to the amount of Al 2 o 3 Amount) is 11% polyaluminum chloride product.

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Abstract

The invention discloses a method for preparing polyaluminium chloride, and in particular relates to a method for producing the polyaluminium chloride by utilization of waste acid, which comprises: firstly, placing aluminum-containing waste acid or the waste acid into a reaction kettle, and simultaneously adding waste aluminum or bauxite into the reaction kettle, and fully utilizing heat energy generated by exothermic reaction between the waste acid and aluminum for preheating; secondly, supplementing heating until the temperature is between 95 and 105 DEG C, and maintaining at the temperature for 3 to 5 hours to realize complete polymerization; and thirdly, separating and enriching products by a precipitation or filtration method. The preparation process has low production cost and mild reaction, does not generate waste gas which pollutes the environment, and realizes comprehensive utilization of waste resources.

Description

technical field [0001] The invention relates to a preparation method of a water treatment agent, in particular to a preparation method of polyaluminum chloride. Background technique [0002] In the process of industrial production, enterprises discharge a large amount of liquid waste and solid waste every day. These wastes are directly discharged, which not only pollutes the environment, but also wastes a lot of resources. For this reason, how to carry out selective comprehensive recycling of these wastes and realize "turning waste into treasure" is increasingly attracting the attention of the whole society. The invention uses aluminum-containing waste acid or waste acid as a raw material to produce a water purifying agent, which is widely used in industrial waste water treatment. [0003] The usual preparation method of existing polyaluminium chloride: take aluminum hydroxide as the method for directly producing polyaluminium chloride as raw material, mix aluminum hydroxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52
Inventor 金月祥
Owner 嘉兴市环科环保新材料科技有限公司