High-efficiency waste sulfuric acid concentration method

A waste sulfuric acid, high-efficiency technology, applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc., can solve the problems of inability to improve the purity of sulfuric acid, equipment loss rate, etc., to achieve high concentration and purification efficiency, improve purity , the effect of increasing the concentration

Inactive Publication Date: 2018-04-20
伊犁南岗化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a high-efficiency method for concentrating waste sulfuric acid, which solves the problem that the equipment loss rate is high and the purity of sulfuric acid cannot be improved in the existing technical process of heating and concentrating sulfuric acid

Method used

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  • High-efficiency waste sulfuric acid concentration method
  • High-efficiency waste sulfuric acid concentration method
  • High-efficiency waste sulfuric acid concentration method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for concentrating high-efficiency waste sulfuric acid, comprising the following steps:

[0029] S1, the waste sulfuric acid is subjected to precipitation reaction in the precipitation tank 1: first place the waste sulfuric acid to be treated in the precipitation tank 1, and add polyaluminum ferric sulfate. The dosage of polyaluminum ferric sulfate is 0.01 per liter of waste sulfuric acid. -0.05g, turn on the rotating motor 13, stir for 5 minutes after the addition, and flocculate Fe 3+ 、Cr 3+ 、Cr 6+ After the metal cations are filtered by the filter 2, the filtered water is obtained;

[0030] Before heating and concentrating, the waste sulfuric acid flows through the liquid circuit for precipitating waste sulfuric acid (the two water flow switches on the liquid circuit for precipitating waste sulfuric acid are turned on, and the rest of the water flow switches are closed), and the metal cations in the waste sulfuric acid are fully recovered by circulation twi...

Embodiment 2

[0038] A method for concentrating high-efficiency waste sulfuric acid, the operation steps are basically the same as those in Example 1, the difference is that the process is heated to 60°C in S2. Wherein in S1, the shell wall of the porous spherical shell 152 is provided with a plurality of openings with a diameter of 10-20 microns; the diameter of the flow hole on the wall of the central connecting pipe 151 is 1.5-3 microns; The hole diameter of the water outlet on the stirring tube 14 is 4-5 microns; in S3, the hole diameter of the hollow fiber membrane is 0.2-0.5 microns.

Embodiment 3

[0040] A high-efficiency method for concentrating waste sulfuric acid, the operation steps are basically the same as those in Example 1, the difference is that the process is heated to 65°C in S2.

[0041] Taking Examples 1-3 as examples below, the sulfuric acid enrichment and purification effect of the present invention is illustrated.

[0042] Get the pickling waste liquid sample (numbered as A) and the chromium electroplating wastewater sample (numbered as B) of the factory, process according to the method of embodiment 1-3 respectively, the concentrated sulfuric acid in the heating tank 3, then detect before and after treatment Fe in samples A and B 3+ 、Cr 6+ 、Cr 3+ 、Cu 2+ , Zn 2+ 、Al 3+ , Pb 2+ content, the results are shown in Table 1. The results in Table 1 show that after two rounds of purification and three rounds of concentration in wastewater samples A and B, the concentration of metal ions was significantly reduced, and Fe 3+ Reduced by more than 88%, Cr 6...

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Abstract

The invention belongs to the technical field of sulfuric acid separation and concentration, and in particular relates to a high-efficiency waste sulfuric acid concentration method. The high-efficiencywaste sulfuric acid concentration method comprises the following steps: S1, performing a precipitation reaction on waste sulfuric acid in a precipitation tank, wherein the precipitation tank structurally comprises a tank body on which a horizontal rotary plate and a rotating motor are arranged, stirring tubes are connected around the bottom edge of the horizontal rotary plate, and porous ball screens are connected onto each stirring tube in a penetrated manner; S2, heating: transferring filtered effluent to a heating tank for heating to 50 to 60 DEG C to obtain effluent of the heating tank; and S3, carrying out distillation and separation by using a concentrated membrane component. By adopting the method disclosed by the invention, the concentration of metal ions in waste sulfuric acid isremarkably reduced, and the concentration of sulfuric acid is further well improved, and furthermore, the novel precipitation tank is used for collecting flocculants while flocculating to greatly reduce the work load of a rear continuous filter, and reduce the equipment loss, so that the cost is lowered, and the efficiency of concentration and purification is high.

Description

technical field [0001] The invention belongs to the technical field of sulfuric acid separation and concentration, and in particular relates to a high-efficiency waste sulfuric acid concentration method. Background technique [0002] As a chemical product, sulfuric acid has been widely used in the production of many industries. For example, a large amount of dilute sulfuric acid will be produced in the production process of chemical industry and petroleum. In order to avoid the pollution of dilute sulfuric acid to the environment, lime or other alkaline solutions are generally used for neutralization, but this will not only cause consumption of lime or other alkaline solutions, but also cause waste of sulfuric acid resources. Concentration of waste sulfuric acid not only helps to reduce The consumption of lime and other materials, and the recycling and reuse of sulfuric acid can be achieved, which will help increase economic costs and build a resource-saving society. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88C01B17/90
Inventor 吴佩阮新民聂豫境顾建家左涛陈梅杨自忠朱洁谢德君杨孟郝海周刘鹏礼周国敏王吉辉时运刚
Owner 伊犁南岗化工有限责任公司
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