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Automatic control system for waste acid treatment

An automatic control system, waste acid technology, applied in the direction of coating, chemical instruments and methods, process efficiency improvement, etc., can solve the problem of easy blockage and damage of nozzles and pre-concentrators, poor continuous stability of production, high fuel consumption, etc. question

Active Publication Date: 2022-06-03
NINGBO BOCHUAN WASTE LIQUOR TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention designs an automatic control system for waste acid disposal to overcome the nozzles and pre-concentrators that are easy to be blocked and damaged when the existing roasting method is used to treat pickling waste liquid, and the continuous production stability is poor; the tail gas has the phenomenon of "red smoke" ; and the problems of large fuel consumption, low waste acid treatment efficiency and single product formed by waste acid treatment

Method used

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  • Automatic control system for waste acid treatment
  • Automatic control system for waste acid treatment
  • Automatic control system for waste acid treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] S1, open the first feed port 404 to input solid fuel and primary air into the roaster 4, open the third feed port 406 to input secondary air into the roaster 4 simultaneously, wherein the calorific value of the solid fuel is 10MJ / Kg, The input speed is 3Kg / min, the peroxidation coefficient in the melting chamber 401 is 0.8, and the peroxidation coefficient in the combustion chamber 403 is 1.2;

[0156] S2, the solid fuel is melted and liquefied in the roasting furnace 4 to generate liquid slag and combustible flue gas, the pressure in the furnace is -0.01MPa, and the combustible flue gas moves upward under the action of primary air and negative pressure in the furnace, and the moving speed is about is 0.4m / s, and then burns in the combustion chamber 403, the furnace gas generated by the combustion is discharged through the furnace gas discharge port 407 in the upper part of the roasting furnace 4, and the solid particles generated by the combustion fall into the liquid s...

Embodiment 2

[0164] S1, open the first feed port 404 to input solid fuel and primary air into the roaster 4, open the third feed port 406 to input secondary air into the roaster 4 simultaneously, wherein the calorific value of the solid fuel is 14MJ / Kg, The input speed is 3Kg / min, the peroxidation coefficient in the melting chamber 401 is 0.9, and the peroxidation coefficient in the combustion chamber 403 is 1.1;

[0165] S2, the solid fuel is melted and liquefied in the roasting furnace 4 to generate liquid slag and combustible flue gas, the pressure in the furnace is -0.03MPa, and the combustible flue gas moves upward under the action of primary air and negative pressure in the furnace, and the moving speed is about is 0.5m / s, and then burns in the combustion chamber 403, the furnace gas generated by the combustion is discharged through the furnace gas discharge port 407 in the upper part of the roasting furnace 4, and the solid particles generated by the combustion fall into the liquid s...

Embodiment 3

[0173] The slag powder processed by the crushing device 8 in the above-mentioned embodiments 1 and 2 was used as a rust inhibitor to prepare an anti-corrosion coating. The anti-corrosion coating includes: 65 parts by weight of acrylic emulsion, 20 parts by weight of pure water, 12 parts by weight of epoxy resin parts by weight, 10 parts by weight of wollastonite, 3 parts by weight of phosphoric acid, 1 part by weight of a rust inhibitor, and 0.5 part by weight of a dispersant.

[0174] The preparation process of the anti-corrosion coating is as follows: pure water, wollastonite, phosphoric acid, rust inhibitor and dispersant are added to a grinding machine, and after grinding to an average particle size of 50-60 um, acrylic emulsion and epoxy resin are added, and the mixture is stirred. After uniformity, the pH was adjusted to 9 to obtain an anti-corrosion coating.

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Abstract

The invention provides an automatic control system for waste acid treatment. The automatic control system comprises a waste acid storage tank and a gas-liquid mixing device, and waste acid liquid is sprayed into the gas-liquid mixing device through a nozzle; the heat exchange device is provided with a low-temperature medium channel and a high-temperature medium channel; the roasting furnace is provided with a first feeding port and a second feeding port, the second feeding port is connected with an outlet of the low-temperature medium channel, and solid fuel is added into the roasting furnace through the first feeding port; the roasting furnace gas is treated by the separation and dust removal device to form clean furnace gas and solid dust particles; the absorption device is connected with the separation and dust removal device and the gas-liquid mixing device, part of furnace gas discharged by the separation and dust removal device enters the absorption device, and the remaining furnace gas enters the gas-liquid mixing device. And the device is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the field of waste acid treatment, in particular to an automatic control system for waste acid treatment. Background technique [0002] Steel products, such as steel plates and steel pipes, are an important material for people's production and life. In the production process of steel products, if the steel products are placed for too long, a layer of iron oxide scale will be formed on the surface. Before cold rolling, this layer of iron oxide scale needs to be washed off with acid solution. After the acid solution is used repeatedly for a period of time, The acid concentration decreases and the impurity content increases, which cannot effectively remove the iron oxide scale on the surface of the steel product, and becomes a waste acid solution. Taking a small and medium-sized cold rolling mill as an example, the amount of waste acid produced every day can be as many as tens to hundreds of tons. Such a large amount of waste aci...

Claims

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Application Information

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IPC IPC(8): C23G1/36C01B25/37C09D5/08C09D133/00
CPCC23G1/36C01B25/375C09D5/084C09D133/00C08L63/00C08K3/013Y02P10/20
Inventor 钱永清吕学彦曹韧刘大欢康兴文朱福美
Owner NINGBO BOCHUAN WASTE LIQUOR TREATMENT CO LTD
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