Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of recycling iron fine powder from sulfate residue

A technology for recovering sulfuric acid slag and iron, which is applied in the direction of metal recovery, recycling technology, process efficiency improvement, etc., can solve the problems of difficult industrial scale production and low recovery rate, and achieves short processing time, high recovery rate, and method simple effect

Inactive Publication Date: 2015-07-15
XIAMEN UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these treatment methods generally have the disadvantage of low recovery rate, making it difficult to form industrial scale production

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, load an appropriate amount of pyrite slag (that is, sulfuric acid slag, the content analysis of each component is shown in Table 1) in the kettle, add sodium sulfide solution according to the molar ratio of sulfur content in the raw material to sodium sulfide 0.5:1, and fully react for about 5 hours. Filter, the filtrate is sodium polysulfide solution, add sodium carbonate to the filter residue according to the molar ratio of sulfur content in the filter residue to sodium carbonate 1:1, fully react for about 2h, and then filter. The filtrate is sodium sulfate solution. The hydrochloric acid with the same mole number of sodium carbonate as HCl is fully reacted for about 2 hours and then filtered. The filtrate is mainly calcium chloride solution, and the dried filter residue is the iron powder product.

[0023] In the obtained iron concentrate product, the total iron content is above 61%, and the S content is below 0.5%. The composition of iron concentrate products is...

Embodiment 2

[0025] The process flow is the same as in Example 1. First, load an appropriate amount of pyrite slag (that is, sulfuric acid slag, the content analysis of each component is shown in Table 3) in the kettle, add sodium sulfide solution according to the molar ratio of sulfur content and sodium sulfide in the raw material to 0.3:1, and fully react for about 2 hours. Filter, the filtrate is sodium polysulfide solution, add ammonium carbonate to the filter residue according to the molar ratio of sulfur content in the filter residue to sodium carbonate at 0.8:1, fully react for about 1h and then filter. The filtrate is ammonium sulfate solution. The hydrochloric acid with the same mole number of sodium carbonate as HCl is fully reacted for about 1 hour and then filtered. The filtrate is mainly calcium chloride solution, and the dried filter residue is the iron powder product.

[0026] In the obtained iron concentrate product, the total iron content is above 61%, and the S content is be...

Embodiment 3

[0028] The process flow is the same as in Example 1. First, load an appropriate amount of pyrite slag (that is, sulfuric acid slag, the content analysis of each component is shown in Table 1) in the kettle, add sodium sulfide solution according to the molar ratio of sulfur content and sodium sulfide in the raw material to 0.1:1, and react for about 0.5h. Filtrate, the filtrate is sodium polysulfide solution, add ammonium carbonate to the filter residue according to the molar ratio of sulfur content in the filter residue to sodium carbonate 0.5:1, react for about 0.5h and then filter. The filtrate is ammonium sulfate solution. The hydrochloric acid with the same mole number of sodium carbonate as HCl, react for about 0.5h and then filter. The filtrate is mainly calcium chloride solution, and the dried filter residue is the iron powder product.

[0029] Table 1 Composition of pyrite slag (in oxide, %)

[0030] Fe 2 O 3

[0031] Table 2 Composition of iron concentrate products (%)...

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 discloses a method of recycling iron fine powder from sulfate residue and relates to comprehensive utilization of abandoned sulfate residue. The method of recycling the iron fine powder from the sulfate residue is simple in process, high in recycling rate of the iron fine powder and high in production efficiency. The method of recycling the iron fine powder from the sulfate residue comprises the following steps: adding a desulfurizing agent A to the sulfate residue to react, stirring, filtering, collecting filtrate and filtration residue, adding a desulfurizing agent B to the filtration residue to react, filtering, collecting filtrate and filtration residue, adding acid to the obtained filtration residue to react, filtering, collecting filtrate and filtration residue, and drying the obtained filtration residue to obtain the iron fine powder. Through two-step desulfurization, content of sulfur in the iron fine powder can be obviously reduced. Total iron content of obtained iron fine powder products is generally larger than 60%. The recycling rate is higher, the method is simple, and operation can be carried out under a room temperature and atmospheric pressure. Treatment time is short, intermittent operation or continuous operation can be achieved, and industrialized mass production is easy to form. The added desulfurizing agents have pertinence, consumption is small, and iron loss is less.

Description

Technical field [0001] The invention relates to the comprehensive utilization of waste sulphuric acid slag, in particular to a method for recovering fine iron powder from sulphuric acid slag. Background technique [0002] The production of sulfuric acid by the contact method is a main process for the production of sulfuric acid today, and 80% of the sulfuric acid in my country is produced by this process. This process is accompanied by a large amount of iron oxide waste residue (about 0.8 tons of waste residue is discharged for every 1 ton of sulfuric acid produced), but the utilization rate of these waste residues is low, and most of them are piled up, which wastes resources and causes environmental pollution. Therefore, comprehensive utilization of sulfuric acid waste residue is of great significance. [0003] At present, the comprehensive utilization of sulfuric acid waste slag mainly includes three aspects: processing to obtain iron fine powder, processing to obtain iron-conta...

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 & Authority Patents(China)
IPC IPC(8): C22B1/11
CPCY02W30/54Y02P10/20
Inventor 李军黄长春朱林静洪燕珍苏玉忠王宏涛
Owner XIAMEN UNIV