Method for analysis and determination of heavy metal occurrence key mineral phases in industrial solid waste

Patent metadata

Field	Value
Publication number	US-12159691-B2
Application number	US-202217990501-A
Country	US
Kind code	B2
Filing date	Nov 18, 2022
Priority date	Aug 19, 2021
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

The present invention provides a method for analysis and determination of the heavy metal occurrence key mineral phases in industrial solid waste, by performing N concentration gradients dissociation determination of the heavy metal solid waste to be tested under the same dissociation conditions, to give the dissociation degrees of the heavy metal elements to be tested at N different concentration gradients; the dissociated solid residues after dissociation being quantitatively analyzed for the mineral phase, to give the relative content of each mineral phase in the M mineral phases of the heavy metal solid waste to be tested; then calculating to give the occurrence distribution proportion of the heavy metal elements in the mineral phase, which are accumulated from high to low; the occurrence key mineral phase whose cumulative occurrence proportion exceeds the preset cumulative threshold value is determined to be the key mineral phase of the heavy metal elements.

First claim

What is claimed is:

1. A method for analysis of an industrial solid waste for determination of key mineral phases of heavy metal occurrence in the industrial solid waste, comprising following steps:
S 1 , determining contents of heavy metal elements in a heavy metal solid waste to be tested (HMSWtbt);
S 2 , performing dissociation of HMSWtbt in acid solutions with n concentration gradients under a set of dissociation conditions, wherein a same set of dissociation conditions to be used during each dissociation experiment in the acid solutions with the n concentration gradients to determine a plurality of dissociation degrees of the heavy metal element to be determined at n different concentration gradients

Exp

n
×
p

=

(

d
11

⋯

d

1
⁢
p

⋮

d
ij

⋮

d

m
⁢
1

⋯

d
np

)

,

 wherein d ij represents a dissociation degree of a heavy metal element j to be determined in an i-th concentration gradient after dissociation, d ij ∈(0, 1), i=1, 2, 3, . . . , n, j=1, 2, . . . , p;
S 3 , quantitatively analyzing mineral phases in a dissociated solid residue after dissociation in step S 2 , determining a relative content W ik of each mineral phase in m mineral phases of the HMSWtbt, and then calculating a dissociation degree of each
mineral phase expressed as

L

n
⁢
x
⁢
m

=

(

l
11

⋯

l

1
⁢
m

⋮

l
ik

⋮

l

n
⁢
1

⋯

l
nm

)

 according to a formula

I

i
⁢
k

=

m
o

⁢

W

o
⁢
k

-

m
i

⁢

W
ik

m
o

⁢

W

o
⁢
k

,

wherein k=1, 2, 3, . . . , m, l ik represents a dissociation degree of a mineral phase k after dissociation at the i-th concentration gradient, W 0k is a mass fraction of the mineral phase k in the HMSWtbt under initial conditions, m 0 is an initial sample mass of the HMSWtbt, m i is a mass of the dissociated solid residue after dissociation at the i-th concentration gradient, and W ik is the mass fraction of the mineral phase k in the dissociated solid residue after dissociation at the i-th concentration gradient;
S 4 , according to the formula L n×m ×R m×p =Exp n×p , solving an occurrence distribution proportion of the heavy metal element in the mineral phases expressed as

R

m
⁢
x
⁢
p

=

(

r
11

⋯

r

1
⁢
p

Assignees

• Univ Central South

Inventors

• Lin Zhang
• Lin Le
• Liang Yanjie
• Liu Xueming
• Ke Yong
• Yan Xu
• Tian Chen
• Liu Zhangbin

Classifications

• G01N2223/652

  impurities, foreign matter, trace amounts · CPC title

• G01N2223/637

  liquid · CPC title

• G01N2223/0566

  analysing diffraction pattern · CPC title

• G01N23/2055 Primary

  Analysing diffraction patterns · CPC title

• G01N2223/605

  phases · CPC title