Composite curing agent forchemical nickel plating waste liquid evaporation concentrated solution as well as preparation method and application of composite curing agent

A technology of composite curing agent and evaporative concentrated solution, which is applied in chemical instruments and methods, metallurgical wastewater treatment, neutralization water/sewage treatment, etc., can solve the problem of increasing solid waste outsourcing costs, increasing the cost of curing agent, and the amount of curing agent used Large and other problems, to achieve the effect of reducing the amount of outsourcing, increasing the specific surface area and adsorption capacity, and fast curing efficiency

Pending Publication Date: 2021-12-21
深圳瑞赛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentrated solution has the characteristics of high toxicity and high outsourcing costs. The existing technology deals with the evaporation concentrated solution mainly for soda lime solidification and cement solidification.
This kind of method takes a long time to cure the concentrated liquid and uses a large amount of curing agent. It is difficult to achieve the expected effect for the concentrated liquid with high water content and high organic content. For example, when the amount of soda lime is solidified, when the amount of soda lime is greater than a certain proportion During the curing process, a large amount of ammonia odor will be produced. If the amount of soda lime is reduced, the expected effect will not be achieved, which is not conducive to health and environmental protection; while the consumption of cement in the curing process is large, the proportion of sludge produced after curing Large, that is to say, the cost of curing agent is increased, and the outsourcing cost of solid waste in the later stage is increased

Method used

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  • Composite curing agent forchemical nickel plating waste liquid evaporation concentrated solution as well as preparation method and application of composite curing agent
  • Composite curing agent forchemical nickel plating waste liquid evaporation concentrated solution as well as preparation method and application of composite curing agent
  • Composite curing agent forchemical nickel plating waste liquid evaporation concentrated solution as well as preparation method and application of composite curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Present embodiment is the preparation of composite curing agent, and its steps are:

[0049] S1 Acid modification of bentonite:

[0050] Immerse bentonite in 0.5mol / L HCl solution for 12 hours to ensure that the Ca contained in bentonite 2 + , Mg 2+ 、Al 3+ Plasma dissolution can also achieve the purpose of dredging the pore size;

[0051] S2 Wash the slurry with deionized water to neutrality and then dry it in an oven at 95°C;

[0052] S3 Place the dried bentonite in a muffle furnace that has been evacuated and filled with nitrogen to protect it, and raise the temperature to 300°C at a rate of 5°C / min and keep it for 3h. After the calcination is completed and cooled, pass it through a 200-mesh nylon screen.

[0053] see figure 1 , the water absorption rate of the modified bentonite in this process was tested to be 294g·g -1 .

[0054] In S4, 6 kg of modified bentonite, 1 kg of polyferric chloride, 1 kg of soda lime passed through a 100-mesh screen, and 2 kg of c...

Embodiment 2

[0056] Present embodiment is the preparation of composite curing agent, and its steps are:

[0057] S1 Acid modification of bentonite:

[0058] Immerse bentonite in 0.5mol / L HCl solution for 12 hours to ensure that the Ca contained in bentonite 2 + , Mg 2+ 、Al 3+ Plasma dissolution can also achieve the purpose of dredging the pore size;

[0059] S2 Wash the slurry with deionized water to neutrality and then dry it in an oven at 95°C;

[0060] S3 Place the dried bentonite in a muffle furnace that has been evacuated and filled with nitrogen, and raise the temperature to 350°C at a rate of 5°C / min and keep it for 3h. After the calcination is completed and cooled, pass it through a 200-mesh nylon screen.

[0061] see figure 1 , the water absorption rate of the modified bentonite in this process was tested to be 312g·g -1 .

[0062] In S4, 3.5 kg of modified bentonite, 3.5 kg of polyferric chloride, 1.5 kg of soda lime and 1.5 kg of cement passed through a 100-mesh screen a...

Embodiment 3

[0064] Present embodiment is the preparation of composite curing agent, and its steps are:

[0065] S1 Acid modification of bentonite:

[0066] Immerse bentonite in 0.5mol / L HCl solution for 12 hours to ensure that the Ca contained in bentonite 2 + , Mg 2+ 、Al 3+ Plasma dissolution can also achieve the purpose of dredging the pore size;

[0067] S2 Wash the slurry with deionized water to neutrality and then dry it in an oven at 95°C;

[0068] S3 Place the dried bentonite in a muffle furnace that has been evacuated and filled with nitrogen, and raise the temperature to 400°C at a rate of 5°C / min and keep it for 3h. After the calcination is completed and cooled, pass it through a 200-mesh nylon screen.

[0069] see figure 1 , the water absorption rate of the modified bentonite in this process was tested to be 388g·g -1 . The water absorption rate at this temperature is the highest.

[0070] In S4, 4.5kg of modified bentonite, 1.5kg of polyferric chloride, 1kg of soda li...

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Abstract

The invention provides a composite curing agent for a chemical nickel plating waste liquid evaporation concentrated solution. The composite curing agent comprises the following components in percentage by weight: 60-70% of a thickening agent, 5-15% of soda lime and 15-30% of cement, and the thickening agent is modified bentonite or a mixture of modified bentonite and polyferric chloride; and the ratio of the modified bentonite to the polyferric chloride is (1-6): (6-1) when the modified bentonite and the polyferric chloride are mixed. The preparation of the composite curing agent is completed by uniformly mixing the raw materials according to the proportion. The invention further provides application of the composite curing agent in treatment of chemical nickel plating waste liquid evaporation concentrated liquid . According to the composite curing agent, the thickening agent is mixed with the soda lime and the cement, physical and chemical reactions such as adsorption and coprecipitation of thickening components, permeation resistance and leaching resistance of the cement and hydroxide precipitation generated between the soda lime and the heavy metal are integrated, the activity of the heavy metal in the sludge is weakened from multiple angles, and the curing efficiency of a concentrated solution is remarkably improved; and the use amount of a curing material is reduced, and the curing treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a preparation method and application of a curing agent for evaporation concentrate of electroless nickel plating waste liquid. Background technique [0002] Electroless nickel plating refers to the process of using a certain concentration of reducing agent at high temperature to reduce nickel ions to nickel and deposit them on the surface of the plated parts through autocatalytic reduction. It is widely used in aerospace, electronics, machinery and other fields. However, as the reaction process progresses, the electroless nickel plating solution will gradually become turbid, which will affect the overall performance of the coating, and it has to be discharged. The concentration of heavy metals in electroless nickel plating waste liquid can be as high as several thousand milliliters, which seriously threatens human health and ecological safety. Conventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/28C02F1/52C02F1/72C02F9/10C02F101/20C02F103/16
CPCC02F1/00C02F1/281C02F1/5236C02F1/72C02F9/00C02F1/62C02F1/36C02F1/66C02F1/56C02F1/04C02F2103/16C02F2101/20
Inventor 吴思国张义彭云李向奎朱子岳罗骥郑赢忠
Owner 深圳瑞赛环保科技有限公司
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