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

A method for comprehensively extracting valuable metals from sulfuric acid slag phosphorylation roasting-leaching-extraction

A technology for comprehensive extraction and valuable metals, applied in phosphorus compounds, chemical instruments and methods, non-metallic elements, etc., can solve the problems of low economic value of value-added processing technology, and achieve the effect of low cost, simple operation and high economic value

Active Publication Date: 2020-05-22
CENT SOUTH UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of comprehensive utilization of sulfuric acid slag and low economic value of value-added processing technology in the prior art, the first purpose of the present invention is to provide a process for efficiently and comprehensively extracting sulfuric acid by combining phosphorylation roasting, phosphoric acid leaching, and extraction and separation. A method for valuable metals such as iron, copper, cobalt and nickel in slag, the method is simple to operate, low in production cost, friendly to the environment, and meets the requirements of industrial 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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for comprehensively extracting valuable metals from sulfuric acid slag phosphorylation roasting-leaching-extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using sulfuric acid slag from a sulfuric acid plant (iron grade 56.3%, copper, cobalt, and nickel contents 0.6%, 0.3%, and 0.4% respectively) as raw material, phosphoric acid is added according to the phosphorus-iron ratio of 1.02:1, and the mass of sulfuric acid slag is 3.5%. Add composite sodium salt, the composition of composite sodium salt is sodium carbonate: sodium fluoride ratio is 75:25; then the mixed material is oxidized and roasted, the roasting temperature is 500 ° C, the roasting time is 1.5h, and the roasting atmosphere is air; roasting After the end, crush it, and then carry out grinding and leaching. The solid ratio of the grinding and leaching solution is 1:1. The grinding solution is a phosphoric acid solution with pH=1.0. The grinding fineness is 100% and less than 0.037mm. Separation; washing the solid-phase product with distilled water until the pH of the washing solution is greater than 6, and obtaining the ferric phosphate dihydrate product, the pu...

Embodiment 2

[0029]Using sulfuric acid slag from a sulfuric acid plant (iron grade 56.3%, copper, cobalt, and nickel contents are 0.6%, 0.3%, and 0.4% respectively) as raw material, phosphoric acid is added according to the phosphorus-iron ratio of 1.20:1, and the mass of sulfuric acid slag is 1.0%. Add composite sodium salt, the composition of composite sodium salt is sodium carbonate: the ratio of sodium fluoride is 90:10; then the mixed material is oxidized and roasted, the roasting temperature is 300 ° C, the roasting time is 3.5h, and the roasting atmosphere is air; After the end, crush it, and then carry out grinding and leaching. The solid ratio of the grinding and leaching solution is 1.5:1. The grinding solution is a phosphoric acid solution with pH=1.5. The grinding fineness is 100% and less than 0.037mm. Separation; washing the solid-phase product with distilled water until the pH of the washing solution is greater than 6, and obtaining the ferric phosphate dihydrate product, the...

Embodiment 3

[0031] Using sulfuric acid slag from a sulfuric acid plant (60.6% iron grade, 0.5%, 0.5%, 0.6% copper, cobalt, and nickel content) as raw material, add phosphoric acid according to the ratio of phosphorus to iron 1.10:1, according to 2.0% of the mass of sulfuric acid slag Add composite sodium salt, the composition of composite sodium salt is sodium carbonate: sodium fluoride ratio is 83:17; then the mixed material is oxidized and roasted, the roasting temperature is 300 ℃, the roasting time is 3h, and the roasting atmosphere is air; roasting ends Then crush it, and then carry out grinding and leaching. The solid ratio of the grinding and leaching solution is 1.3:1. The grinding solution is a phosphoric acid solution with pH=1.5. The grinding fineness is 100% and less than 0.037mm. After the grinding, the solid-liquid separation is carried out ; wash the solid phase product with distilled water until the pH of the washing solution is greater than 6, and obtain the ferric phospha...

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 for comprehensively extracting valuable metals from sulfuric acid slag by phosphorylation roasting-leaching-extraction. The method is to uniformly mix sulfuric acid slag with phosphoric acid and sodium carbonate-sodium fluoride composite additives, and then place it in an air atmosphere. Oxidation roasting, after the roasted product is crushed, it is ground and soaked with dilute phosphoric acid, and the solid and liquid are separated. The solid phase product obtained is washed with water to obtain ferric phosphate dihydrate. After the pH value of the obtained leaching solution is adjusted to weak acidity, copper and cobalt are extracted and separated. Valuable metals such as iron, copper, cobalt and nickel in sulfuric acid slag are efficiently and comprehensively extracted by this method, and the method is simple to operate, low in production cost, and environmentally friendly, meeting the requirements of industrial production.

Description

technical field [0001] The invention relates to a method for treating sulfuric acid slag, in particular to a method for efficiently and comprehensively extracting valuable metals such as iron, copper, cobalt and nickel through phosphorylation roasting-leaching-extraction of sulfuric acid slag, which belongs to the field of mineral processing and nonferrous metallurgy. Background technique [0002] Sulfuric acid slag, also known as pyrite slag, is an industrial waste generated during the production of sulfuric acid. Sulfuric acid slag is rich in iron and some calcium, silicon, copper, sulfur and other elements, but the content of non-ferrous metals in sulfuric acid slag is low, and metal minerals and gangue minerals are mutually wrapped, so the comprehensive utilization of sulfuric acid slag is limited. China discharges about 80 million tons of sulfuric acid slag every year, and the country's cumulative reserves exceed 100 million tons. The accumulation of a large amount of ...

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): C22B7/00C01B25/37C22B23/00C22B3/38C22B15/00
CPCC01B25/375C22B7/007C22B15/0069C22B23/0423C22B3/3846Y02P10/20
Inventor 苏子键张元波姜涛涂义康王嘉范晓慧李光辉郭宇峰杨永斌黄柱成朱忠平彭志伟饶明军刘硕
Owner CENT SOUTH UNIV