Recovery processing process of stanniferous electrofacing sludge

A technology of recycling and tin electroplating, which is applied in the field of recycling and processing of tin-containing electroplating sludge, can solve the problems of slow speed, high production cost and low recovery rate.

Inactive Publication Date: 2013-02-06
福建省固体废物处置有限公司
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main process of the alkaline leaching method is: leaching with sodium hydroxide - solid-liquid separation - evaporation and crystallization to produce sodium stannate. The leaching rate of this method is low, and the total recovery rate can only reach about 70% by secondary leaching, and sodium hydroxide The price is high, the consumption of sodium hydroxide is large, and the production cost is high.
[0006] Another document introduces sulfuric acid leaching, because tin in tin electroplating sludge exists in two forms, tin hydroxide and elemental tin, and when sulfuric acid is leached, tin hydroxide is easy to leach, and dilute sulfuric acid dissolves elemental tin very slowly, so When the tin electroplating sludge is leached with dilute sulfuric acid, the recovery rate is also very low, which can only reach 70%~80%.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recovery processing process of stanniferous electrofacing sludge
  • Recovery processing process of stanniferous electrofacing sludge
  • Recovery processing process of stanniferous electrofacing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]1 During the leaching process, add 1.5mol / L hydrochloric acid to the tin-containing electroplating sludge and react for 67 minutes in an environment with a temperature of 99°C. The solid-liquid mass volume ratio of electroplating sludge and hydrochloric acid is 1kg:11L, so that the tin element in it is leached into the solution, and after solid-liquid separation, the tin-containing solution and leaching residue are respectively obtained; during the replacement process, the metal aluminum material Add it to the tin-containing solution, and react for 60 minutes in an environment with a temperature of 70°C. Among them, 1.2 times the amount of tin substances in the tin-containing electroplating sludge is replaced to obtain sponge tin. Sponge tin is washed, pressed into blocks, and cast into ingots to obtain crude tin ingots; the crude tin ingots are further purified by refining. The recovery rate of the tin obtained here is 96.3%

[0049] 2. Post-treatment process can also...

Embodiment 2

[0051] 1 During the leaching process, add 3.5mol / L hydrochloric acid to the tin-containing electroplating sludge and react for 60 minutes in an environment with a temperature of 70°C. The solid-liquid mass volume ratio of electroplating sludge and hydrochloric acid is 1kg:5L, so that the tin element in it is leached into the solution, and through solid-liquid separation, the tin-containing solution and leaching residue are respectively obtained; during the replacement process, the metal aluminum material Add it to the tin-containing solution, and react for 60 minutes in an environment with a temperature of 60°C. Among them, 1.5 times the amount of tin substances in the tin-containing electroplating sludge is replaced to obtain sponge tin. Sponge tin is washed, pressed into blocks, and cast into ingots to obtain crude tin ingots; the crude tin ingots are further purified by refining. The recovery rate of the tin obtained here is 96.8%

[0052] 2. Post-treatment process can al...

Embodiment 3

[0054] 1 During the leaching process, add 3.0mol / L hydrochloric acid to the tin-containing electroplating sludge, and react for 60 minutes in an environment with a temperature of 60-99°C. The solid-liquid mass volume ratio of electroplating sludge and hydrochloric acid is 1kg:12L, so that the tin element in it is leached into the solution, and after solid-liquid separation, the tin-containing solution and leaching residue are respectively obtained; during the replacement process, the metal aluminum material Add it to the tin-containing solution, and react for 68 minutes in an environment with a temperature of 50°C. Among them, 1.1 times the amount of tin substances in the tin-containing electroplating sludge is replaced to obtain sponge tin. Sponge tin is washed, pressed into blocks, and cast into ingots to obtain crude tin ingots; the crude tin ingots are further purified by refining. The recovery rate of tin obtained here is 96.1%

[0055] 2. Post-treatment process can als...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a recovery processing process of stanniferous electrofacing sludge. The recovery processing process mainly comprises a leaching process and a replacement process. The leaching process comprises the following steps of: adding hydrochloric acid in the stanniferous electrofacing sludge, leaching contained tin elements to a solution, conducting solid-liquid separation and respectively obtaining a stanniferous solution and leaching slag; the replacement process comprises the following steps of: adding metallic aluminum materials in the stanniferous solution, and replacing to obtain sponge tin. The metal tin obtained by replacement is the sponge tin which obtains crude tin ingots through block pressing and ingot casting respectively, and the crude tin ingots are further purified through refining. Comprehensive recovery rate of the tin in the stanniferous electrofacing sludge can achieve 96%, aluminum entering the solution can be recovered through replacement in a followed treatment process, and waste water after aluminum recovery enters a pickling tank for circulation. An overall process can use waste acid, waste slag, waste water and waste aluminum to serve as raw materials, water steam of heat recovery boilers in a factory can be used for heating, and high-quality industrial raw materials can be produced. The waste slag is solidified according to national standards, and the waste slag can be used for filling after reaching the standard. The recovery processing process turns waste into wealth, saves energy and reduces discharge.

Description

technical field [0001] The invention relates to a process for recycling and treating tin-containing electroplating sludge. Background technique [0002] Tin is a minor metal, and the National Development and Reform Commission is currently deliberating on listing tin as a strategic reserve metal in my country. my country's tin reserves account for 28.85% of the world's total reserves. my country's Yunnan Gejiu is currently the world's largest known tin ore enrichment area, of which tin resource reserves are more than 2 million tons. However, due to long-term and large-scale mining, the proven resource reserves in the Gejiu mining area have been seriously depleted. In the mining area, 14 large-scale mines went bankrupt and closed due to resource depletion, and 4 of the 5 large-scale mines in production belonged to resource crisis mines. At the same time, tin resources in Britain and Thailand, the original tin-producing countries abroad, have all been exhausted. [0003] Met...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B25/06
CPCY02P10/20
Inventor严桂清吴承顺唐文会
Owner福建省固体废物处置有限公司