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Preparation method of composite filter aid for hydrochloric acid waste residue

A composite filter aid technology, applied in the field of environmental engineering, can solve the problems of small effect and narrow range, and achieve the effect of promoting reduction, reducing recycling cost, and easy configuration

Active Publication Date: 2019-09-24
GENERAL TREATMENT ENVIRONMENT BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the narrow pH range of the general assistant / flocculation agent, it has little effect in a strong acid environment with an acidity > 25%.

Method used

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  • Preparation method of composite filter aid for hydrochloric acid waste residue
  • Preparation method of composite filter aid for hydrochloric acid waste residue
  • Preparation method of composite filter aid for hydrochloric acid waste residue

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Example 1. Configuration of composite filter aid and modification of filtration performance of hydrochloric acid waste residue (indoor test)

[0042] (1) Compound filter aid preparation:

[0043] Under the conditions of stirring speed 180r / min and temperature 85-95°C, 1% concentration of polyvinyl alcohol, preferably PVA1799 solution, is pre-configured, and after cooling to normal temperature, water lost by evaporation is added by weighing method. Then accurately weigh a certain mass of polyvinylpyrrolidone according to 0.6% of the volume of the polyvinyl alcohol solution into the solution and fully stir to dissolve. After the polyvinylpyrrolidone is completely dissolved, accurately weigh a certain amount of polyethylene glycol according to 0.4% of the volume of the above polyvinyl alcohol solution, and dissolve it in the same way, and the obtained mixed solution is a composite filter aid with a concentration of 2%.

[0044] (2) Modification of hydrochloric acid waste ...

example 2

[0049] Example 2. Modification of the filtration performance of hydrochloric acid waste residue by compound filter aids (small filter press test)

[0050] In actual production and application, the moisture content of the material after dehydration can more intuitively represent its filtration and dehydration performance. Therefore, on the basis of the above test, the filter area is 0.16m 2 The 250-type chamber filter press was used to compare the deacidification effect of the modified hydrochloric acid waste residue.

[0051] (1) The specific test steps, methods and parameters are adjusted as follows:

[0052] ① Pre-dissolved in hot water at 90-95°C to obtain a 2% concentration composite filter aid solution;

[0053] ② Take some hydrochloric acid waste residue, add compound filter aid according to 25% of its volume for conditioning, add slowly while stirring, continue stirring for 2 minutes after adding, make the system fully mixed evenly, and then use a filter press to feed...

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Abstract

The invention provides a preparation method of a compound filter aid for a hydrochloric acid waste residue. The compound filter aid is formed by mixing non-ionic type organic macromolecules polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol; the method includes the steps: a step of preparation of a polyvinyl alcohol solution: adding polyvinyl alcohol to a breaker containing a plurality of volumes of pure water, placing the polyvinyl alcohol in a constant-temperature magnetic stirrer, stirring to dissolve, after the polyvinyl alcohol is completely dissolved, cooling to room temperature, and replenishing water lost due to evaporation through a weighing method; and a step of preparation of the compound filter aid: weighing a number of mass of polyvinylpyrrolidone, adding the polyvinylpyrrolidone into the prepared polyvinyl alcohol solution, and placing in the constant temperature magnetic stirrer, stirring to dissolve, after the polyvinylpyrrolidone is completely dissolved, adding a number of polyethylene glycol, placing the mixture in the constant temperature magnetic stirrer, stirring to dissolve, and thus obtaining the solution which is the compound filter aid.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a method for preparing a composite filter aid for hydrochloric acid waste residue. Background technique [0002] Spherical magnesium chloride supported Ziegler-Natta catalyst is a commonly used industrial polyolefin catalyst, and its control of polymer morphology and its replication effect can be traced back to 1967. Italy Monte Edison announced in the 1970s that it had prepared a magnesium chloride carrier by spraying and used it to prepare spherical polyolefin catalysts. Subsequently, another patent of the company used the magnesium chloride alcoholate melt to be sprayed at high pressure or stirred at high speed to disperse in the dispersion medium, then cooled and shaped, and then used as a carrier to prepare a spherical catalyst. Sinopec Catalyst Beijing Aoda Branch, on the basis of the above-mentioned magnesium chloride carrier technology, has improved the preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30
Inventor 张卫华宋永伟
Owner GENERAL TREATMENT ENVIRONMENT BEIJING CO LTD
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