A method for synergistic resource utilization of copper slag and sodium sulfate waste slag

A sodium sulfate, resource-based technology, applied in the direction of silicon oxide, silicon dioxide, process efficiency improvement, etc., can solve the problems of difficulty in bulk consumption and treatment, high site requirements, easy to absorb water and deliquescence, etc., and achieve technical operability The effect of strong, heavy metal grade improvement and low cost

Active Publication Date: 2021-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hao Shufeng et al. used pure low-modulus water glass as the silicon source, and Na 2 SO 4 White carbon black is prepared for stabilizers, etc.; CN102234116A reports the use of iron tailings to prepare white carbon black. This method only recovers silicon resources and has certain requirements for raw materials. The silicon source is iron tailings with high-grade silicon content , poor adaptability
[0004] Glauber's salt (Na 2 SO 4 ) As a common industrial by-product, it is produced in large quantities from the industrial production process of chemical industry and metallurgy. Because it is easily soluble in water, a large amount of storage has high requirements on the site, and its stability is poor. It is easy to absorb water and deliquescent. difficulty

Method used

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  • A method for synergistic resource utilization of copper slag and sodium sulfate waste slag
  • A method for synergistic resource utilization of copper slag and sodium sulfate waste slag
  • A method for synergistic resource utilization of copper slag and sodium sulfate waste slag

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Effect test

Embodiment 1

[0047] First, 1kg copper slag ball milling and over 200 mesh sieves, according to the mass ratio of 1: 1 and sodium sulfate waste residue, at a CO atmosphere and 1000 ° C for 120 min; after the reaction is completed, the calcination product is removed, and the sieve is broken. Magnetic selection, magnetic selection in 1200 g of field, to obtain iron powder, iron powder XRD analysis image 3 . Magnetic selection tailings were poured into 1.5L water and stirred after a certain time after a certain period of time; gave about 1.2 l of the filtrate 720 min at 50 ° C, and then the water bath was warmed to 80 ° C; and the 120 ml concentration of 10 wt% dispersant NaCl was added to the water bath. The 120 ml concentration is 70 wt% surfactant n-butanol; the resulting solution is stirred, and the concentration of 5 wt% sulfuric acid is added dropwise, and the pH is adjusted to 8 ~ 9, and the constant temperature of 80 ° C is filtered after 180 min. Water repeatedly rinsed - 6 times, then d...

Embodiment 2

[0049] First, 1kg copper slag ball mill and over 200 mesh sieve were first, according to the mass ratio 2: 1 and sodium sulfate waste residue, 60 min was charged at 900 ° C; after the end of the reaction, the calcined product was taken out, and the sieve was broken. The selection machine, magnetic option is performed on 1200 g of field, to obtain iron powder, magnetic selection tailings poured into 1.5L water to stir after a certain time after a certain period of time; to get about 1.2L filtrate 900 min at 60 ° C, then heated to 70 ° C; 120 ml of concentration of 15 wt% dispersant NaCl, 100 ml of concentration of 80 wt% surfactant NaCl is added, and then the resulting solution is stirred, and the concentration is added to 8 wt% sulfuric acid, adjusting the pH to 8 ~ 9. Keep 50 ° C constant temperature aging 240 min after filtration; filter residue repeatedly rinsed with deionized water - filtration 5 times, then the filter residue dries at a temperature of 90 ° C to obtain white c...

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Abstract

The invention discloses a method for cooperatively recycling copper slag and sodium sulfate waste residues. The method comprises the following steps of (1) mixing the copper slag with the sodium sulfate waste residue, and roasting in a reducing atmosphere; (2) carrying out ball milling and sieving on the roasted product, and then carrying out magnetic separation; (3) mixing and stirring magnetic separation tailings with water, filtering to obtain filter residues and filtrate, aging the filtrate, adding a dispersing agent and a surfactant, and adding an acid to react to obtain white carbon black. According to the method, sodium sulfate waste residue is used as a roasting additive, sodium sulfide is formed under the reduction condition, iron oxide is reduced to metal iron, and the iron oxide is recycled after being sorted; the sodium sulfide is used as a fixing agent for the valuable metals, meanwhile, reacts with silicate in the copper slag to form sodium silicate, and is used as a raw material for preparing white carbon black, and the resource utilization of silicon is realized while the iron recovery in the copper slag is realized.

Description

Technical field [0001] The invention belongs to the field of metallurgical engineering and environmental engineering, involving a method of synergistic residue and sodium sulfate waste residue. Background technique [0002] With the rapid development of the colored metallurgical industry, the resources facing the industry, environmental problems have become increasingly prominent, and have become the lifeline of my country's colored smelting companies. Metal copper smelting is a big branch in colored smelting. Although solid waste produced in the smelting process is a pollutant, it is also an important secondary resource. It is effective to address the key to environmental protection of my country's non-ferrous metallurgical industry resources. one. Each 1T fine copper will produce about 2 to 3T slag, my country's copper smelting enterprises have a total of millions of tons of solid waste, reaching hundreds of millions of tons in the year, has become one of the largest industries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/02C01B33/12
CPCC01B33/12C22B1/02C22B7/001C22B7/04Y02P10/20
Inventor 彭宁王云燕徐慧王功亮罗永健王忠兵刘德刚赵宗文闵小波
Owner CENT SOUTH UNIV
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