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

Method for preparing pyrophyllite from spodumene lithium extraction waste residues

A technology for extracting lithium waste slag and spodumene, which is applied in the direction of aluminum silicate and silicate, can solve the problems of difficult gas treatment and industrial waste slag utilization, and achieve low cost, alleviate resource shortage, and significant economic benefits Effect

Active Publication Date: 2020-07-14
中山市清融嘉创能源科技有限责任公司
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the presence of calcium sulfate, even if the slag is subsequently treated to remove iron and impurities, the industrial waste slag is difficult to be utilized by other industries
The main reason is that calcium sulfate will produce acidic SO after high-temperature roasting 2 Gas is difficult to deal with, so the waste residue treatment is also a difficult problem for spodumene processing enterprises

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
  • Method for preparing pyrophyllite from spodumene lithium extraction waste residues
  • Method for preparing pyrophyllite from spodumene lithium extraction waste residues
  • Method for preparing pyrophyllite from spodumene lithium extraction waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The spodumene used in Example 1 is a certain real estate spodumene in Sichuan, and the chemical composition analysis results of its concentrate extracting lithium waste residue are shown in Table 1, and the X-ray powder crystal diffraction pattern analysis is as follows: figure 1 shown. The peak shape of the XRD results is diffuse, and there is no obvious characteristic absorption peak. Combined with the chemical composition analysis results, it can be known that the lithium extraction waste residue is amorphous silicon-aluminum waste residue.

[0030] Table 1 Chemical composition analysis results of lithium extraction waste residue (w B %)

[0031]

[0032] The bauxite used in this example comes from a real estate high-silicon bauxite mine in Dengfeng City, and its chemical composition analysis results are shown in Table 2.

[0033] The chemical composition analysis result of table 2 bauxite (w B %)

[0034]

[0035] Weigh 500 g of lithium extraction waste re...

Embodiment 2

[0043] The lithium extraction waste slag used in this example is the lithium extraction waste slag of a lithium carbonate processing enterprise in Shandong, and its chemical composition analysis results are shown in Table 5.

[0044] Table 5 extracts the chemical composition analysis result of lithium waste residue (w B %)

[0045]

[0046] The bauxite used in this embodiment is the same as in Example 1.

[0047] Weigh 500 g of lithium extraction waste residue from spodumene, add 3000 g of water, and mix to form a slurry. Add 20g mass concentration to it and be 30% H 2 o 2 Solution, react at room temperature for 2h.

[0048] Heat the slurry to 90°C, weigh 15g of sodium sulfoxylate and 18g of oxalic acid, add them to the hot slurry, react for 1 hour, filter; wash with 3000mL of water for 4 to 6 times, and dry at 105°C for 12 hours to obtain impurity-removed filter cake. The chemical composition analysis results of the filter cake after impurity removal are shown in Tab...

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 method for preparing pyrophyllite from spodumene lithium extraction waste residues, which comprises the following steps: roasting spodumene with sulfuric acid, carrying outwater leaching lithium extraction to obtain final solid waste residues, and carrying out impurity removal bleaching and calcination on the solid waste residues to prepare pyrophyllite. The method comprises the following steps: firstly, mixing the waste residues with water according to a mass ratio of 1:(3-8), adding an H2O2 solution which accounts for 3-5% of the mass of the waste residues, and performing reacting at normal temperature for 1-2 hours; adding sodium sulfite accounting for 2.5-4.5% of the mass of the waste residues and oxalic acid accounting for 2-5% of the mass of the waste residues, performing reacting at 55-95 DEG C for 1-2 hours, performing filtering, and washing to obtain a filter cake; and drying the filter cake, adding bauxite according to the mass ratio of 1:(0.2-0.5), and performing calcining at 600-950 DEG C for 1-2 hours to obtain pyrophyllite. According to the method, main components in residual waste residues in the spodumene lithium extraction process are fully utilized, waste is turned into wealth, economic benefits are increased, and the problem of solid waste environmental compatibility in the existing ore lithium processing industry can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste recovery and utilization, and in particular relates to a method for preparing pyrophyllite by utilizing spodumene lithium extraction waste residue. Background technique [0002] There are two polytypes of pyrophyllite. Monoclinic (2M) is more common. Space group is C 6 2h -C2 / c;a 0 =0.515nm,b 0 = 0.892nm, c 0 = 1.895 nm, β = 99.55°; Z = 2. Triclinic (1Tc), C 1 i -P1;a 0 =0.5173nm,b 0 = 0.8960nm, c 0 =0.9360nm, α=91.2°, β=100.4°, γ=90°, Z=2. Theoretical chemical composition (w B %): Al 2 o 3 28.3%, SiO 2 66.7%, H 2 O 5.0%. The structural unit layer is a layer of gibbsite octahedron sandwiched between two layers of silicon-oxygen tetrahedron, forming a 2:1 layered structure. 2 / 3 of the octahedron is covered with Al 3+ Occupy (M 1 ), the other 1 / 3 of the octahedral sites are vacancies (M 2 ). Pyrophyllite has good chemical stability and insulation, and can be us...

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
IPC IPC(8): C01B33/26
CPCC01B33/26C01P2002/72Y02P10/20
Inventor 刘梅堂马鸿文姚文贵王启凯
Owner 中山市清融嘉创能源科技有限责任公司