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Method for preparing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid

A polyaluminum chloride waste slag and water treatment agent technology, which is applied in the fields of aluminum chloride, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of ineffective control of eluate concentration, unstable performance of polyaluminum chloride, Energy consumption and other problems, to achieve the perfect crushing process, easy to promote industrialization, to overcome the effect of slipping phenomenon

Active Publication Date: 2021-01-08
河南省福可思环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, most of the water treatment agent polyaluminum chloride waste residue was dumped and landfilled at will, and there was a large environmental risk. At the same time, because the water treatment agent polyaluminum chloride waste residue also contained water treatment agent polyaluminum caused a lot of waste of resources
Therefore, many scholars are working on using it to prepare other materials or recycle the water treatment agent polyaluminum chloride in the waste residue, but usually the energy consumption caused by the ineffective control of the concentration of the eluate is astonishing and the occurrence of evaporative concentration occurs. Unstable conditions lead to defects such as unstable performance of the recycled water treatment agent polyaluminum chloride. Therefore, how to recycle polyaluminum chloride waste slag and recover stable water treatment agent polyaluminum chloride from the water treatment agent polyaluminum chloride waste slag Aluminum Chloride is a current problem

Method used

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  • Method for preparing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid
  • Method for preparing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid
  • Method for preparing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment provides a method for producing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid, such as figure 1 As shown, it specifically includes the following steps:

[0029] DeCl - Treatment The water treatment agent polyaluminum chloride waste slag is washed with water and treated with lye to obtain dechlorinated treatment liquid and mixed mud, wherein the mass percentage concentration of the lye is controlled to be 10%, and the lye is For sodium hydroxide solution;

[0030] Circulation evaporation The dechlorination treatment solution is placed in a three-effect four-body forced circulation evaporation equipment for circulation evaporation and concentration treatment to obtain 30% Al 2 o 3 of liquid polyaluminum chloride and condensed water.

Embodiment 2

[0032] This embodiment provides a method for producing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid, such as figure 2 As shown, the steps are roughly the same as those in Example 1, except that the method provided in this example also includes reclaiming the condensed water, and using the condensed water as a solution to the water treatment agent polychlorinated water. Aluminum waste slag carries out the first water elution of Cl -Water source during treatment; In addition, the mass percent concentration of the lye is 8%.

Embodiment 3

[0034] This embodiment provides a method for producing polyaluminum chloride from water treatment agent polyaluminum chloride waste slag dechlorination treatment liquid, such as image 3 As shown, it specifically includes the following steps:

[0035] The dechlorination ion treatment firstly carries out rough selection to described water treatment agent polyaluminum chloride waste slag and obtains the water treatment agent polyaluminum chloride waste slag with particle diameter greater than 15mm and the water treatment agent polyaluminium chloride waste slag with particle diameter less than 15mm; Then use The differential speed pulverizer crushes the water treatment agent polyaluminum chloride waste slag with a particle size greater than 15mm into a water treatment agent polyaluminum chloride waste slag with a particle size less than 15mm. The water treatment agent polyaluminum chloride waste slag less than 15mm is subjected to the first water elution of Cl in sequence - Trea...

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Abstract

The invention provides a method for preparing PAC (polyaluminum chloride) from a dechlorination treatment liquid of water treatment agent PAC waste residues. The method mainly comprises the steps as follows: performing water washing treatment and alkali washing tretament on water treatment agent PAC waste residues to obtain the dechlorination treatment liquid and mixed mud; placing the dechlorination treatment liquid in triple-effect and four-body forced circulation evaporation equipment or an MVR forced circulation evaporator for circulation evaporation concentration treatment to prepare liquid PAC and condensate water. By means of the method, PAC can be recycled from the dechlorination treatment liquid of water treatment agent PAC waste residues, waste can be changed into wealth, resource recycling is realized, the process comprises simple steps and facilitates industrial promotion.

Description

technical field [0001] The invention relates to the field of water purifiers, in particular to a method for preparing polyaluminum chloride from dechlorination treatment liquid of polyaluminum chloride waste slag, a water treatment agent. Background technique [0002] There are many methods for producing water treatment agent polyaluminum chloride (PAC) at home and abroad. The common method is the acid-dissolving one-step method of bauxite or aluminum hydroxide and calcium aluminate powder, that is, bauxite or aluminum hydroxide and calcium aluminate powder Liquid PAC can be obtained after reacting with hydrochloric acid or mixed acids under certain conditions. The liquid PAC is drum dried or spray dried to obtain a solid product. my country produces 6,000kt of liquid PAC annually, and every 1t of liquid PAC containing 10% alumina will produce 150kg of waste residue and 900kt of solid waste residue per year. This kind of waste residue is viscous, weakly acidic, and contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56C02F1/52
CPCC01F7/56C02F1/5236
Inventor 焦猛焦天伟
Owner 河南省福可思环保科技有限公司
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