A treatment method for recovering nickel from nickel-containing sludge

A treatment method and sludge technology are applied in the direction of nickel sulfide, ammonium sulfate, process efficiency improvement, etc., which can solve the problems of difficult sedimentation, easy clogging of pipelines and filter devices, and impact on treatment efficiency, and achieve fast sedimentation rate. , the effect of accelerating the sedimentation rate and reducing the discharge

Active Publication Date: 2021-11-30
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the ammonia leaching method is used to extract copper and nickel, the copper can be precipitated by sulfide to separate copper and nickel. When copper sulfide precipitates in the system, its particles are small, and it is easy to combine with the residual organic components in the system (such as residual in Surfactant in the electroplating solution) emulsification occurs, it is not easy to settle, it has a great impact on the treatment efficiency, and it is easy to block the pipeline and filter device

Method used

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  • A treatment method for recovering nickel from nickel-containing sludge
  • A treatment method for recovering nickel from nickel-containing sludge
  • A treatment method for recovering nickel from nickel-containing sludge

Examples

Experimental program
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preparation example 1

[0054] Preparation example 1, the modification method of silica, specifically as follows:

[0055] S3-1. Disperse silicon dioxide at a concentration of 50g / L in 1L of ethanol and water at a ratio of 9:1, heat to 68±1°C to reflux the system and stir at a rate of 350rpm. After 30 minutes, add 2.5 g of silane coupling agent KH-560 to the system, continue to keep warm and stir, centrifuge at a speed of 3000 rpm after 5 hours, wash the obtained precipitate twice with water and ethanol, and obtain coupling modification after drying. silica;

[0056] Dissolve the coupling-modified silica in 1L of toluene at a concentration of 50g / L, then add 50g of organic molecular chains, heat to 80°C to reflux the system, react for 8 hours, cool down, then centrifuge at 3000rpm, precipitate with water and ethanol Wash twice respectively, and get a treatment component after drying.

[0057] S3-2. Dissolve the primary treatment components prepared in step S3-1 in an ethanol solution at a concentra...

preparation example 2～13

[0059] The difference between Preparation Examples 2-13, the modification method of silicon dioxide and Preparation Example 1 is that in step S3-1, the selection and dosage of organic molecular chains and the dosage of silane coupling agent are shown in Table 2.

[0060]

preparation example 14

[0061] Preparation Example 14, the modification method of silica, is different from Preparation Example 1 in that the amount of 3-aminopropyltriethoxysilane is 0.2 mL.

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Abstract

This application relates to the field of hazardous waste treatment, more specifically, it relates to a treatment method for recovering nickel from nickel-containing sludge, the steps of which include sludge high-temperature calcination, ammonia leaching, sulfide precipitation of copper, sulfide precipitation of nickel four In this step, an additional demulsifier is added during the sulfide precipitation of copper. By adopting the above scheme, it can reduce the emulsification state caused by the fine copper sulfide precipitated particles when the sulfide precipitates copper, accelerate the settlement of copper sulfide particles, and reduce the impact on the pipeline and filter device during the treatment process.

Description

technical field [0001] The application relates to the field of hazardous waste treatment, more specifically, it relates to a treatment method for recovering nickel from nickel-containing sludge. Background technique [0002] In the electroplating industry, the electroplating sludge obtained after the preliminary treatment of the electroplating solution contains a large amount of copper, iron, nickel, chromium and other metals. Direct discharge is not only a waste of resources, but also has a great impact on the natural environment. [0003] Ammonia leaching is a commonly used method for treating nickel-containing sludge. Because ammonia has a strong coordination ability for copper and nickel and a weak coordination ability for calcium and magnesium ions, it has a strong choice for copper and nickel. sex. After the ammonia leaching method is used to extract copper and nickel, the copper can be precipitated by sulfide to separate copper and nickel. When copper sulfide precipi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00C22B15/00C01G53/11C01D5/02C01C1/24
CPCC01C1/24C01D5/02C01G53/11C01P2006/80C22B7/008C22B15/0078C22B15/0089C22B23/0446Y02P10/20
Inventor 陈福泰刘海宁焦娜
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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