# US 10,308,519 B2 · Method for preparing organic environment friendly snow-melting agent by using salt mud from two-alkali method

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- Number: US 10,308,519 B2
- Document ID: US10308519B2
- Status: Granted
- Kind: B2
- Application number: 16/072,885
- Filed: 2017-07-21
- Published: 2019-01-31
- Granted: 2019-06-04
- Earliest claimed: 2016-08-28
- Assignees: Chinasalt Jintan Co., Ltd
- Applicants: Chinasalt Jintan Co., Ltd
- Inventors: Liuping Chen; Junhui Xu; Juntian Han; Zhijun Su; Yaoxing Cui; Cuiting Leng
- Web page: https://patentgrep.com/patent/US10308519B2

## CPC

- C01F 11/185: {After-treatment, e.g. grinding, purification, conversion of crystal morphology}
- C09K 3/18: for application to surfaces to minimize adherence of ice, mist or water thereto (rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J2/30); Thawing or antifreeze materials for application to surfaces (used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K5/00)
- C09K 3/185: {Thawing materials}
- C01P 2004/30: extending in three dimensions
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Disclosed is a method for preparing an organic environment-friendly snow-melting agent by using salt mud from a two-alkali method, relates to the field of environmental protection and resource utilization of solid wastes. The method includes the following steps: first, stirring and reacting an organic acid and the salt mud from a two-alkali method at room temperature to obtain a slurry; filtering the slurry to obtain a filtrate; the filtrate is then concentrated and dried by centrifugal spray drying to obtain a solid powder; granulating the solid powder. The method not only realizes the recycling of salt mud solid waste, but also greatly reduces the production cost of organic environment-friendly snow melting agent by turning waste into wealth, moreover, due to the existence of trace ions, the ability of melting snow and ice has obvious synergistic effect.

## Claims

### Claim 1

A method for preparing an organic environment-friendly snow-melting agent by using a salt mud from a two-alkali method, comprising:
reacting the salt mud with an organic acid to obtain a slurry;
filtering the slurry to obtain a filtrate; wherein the filtrate is then concentrated, dried by centrifugal spray drying, and granulated in sequence to obtain the organic environment-friendly snow-melting agent and wherein the method comprises following specific steps:
(1) stirring and reacting the organic acid and the salt mud at room temperature to obtain the slurry;
(2) filtering the slurry obtained in step (1) to obtain the filtrate, the filtrate is then concentrated under reduced pressure and dried by centrifugal spray drying to obtain a solid powder;
(3) granulating the solid powder obtained in step (2) to obtain the organic environment-friendly snow-melting agent;
a composition of the salt mud in step (1) is calculated based on weight parts: 85-95 weight parts of CaCO3, 0.5-1.5 weight parts of NaCl, 8.5-13.2 weight parts of Mg(OH)2, 1.5-4.0 weight parts of CaSO4, 0.5-1.5 weight parts of Fe(OH)3, 0.5-1.0 weight parts of Al(OH)3 and 0.1-2.0 weight parts of SiO2.

### Claim 2 (depends on 1)

The method for preparing the organic environment-friendly snow-melting agent according to claim 1, wherein the organic acid in step (1) is selected from one of formic acid, acetic acid, propionic acid or pyroligneous acid.

### Claim 3 (depends on 1)

The method for preparing the organic environment-friendly snow-melting agent according to claim 1, wherein a specific operation in step (1) is to disperse the salt mud into the slurry in water, and then add the organic acid to the slurry under stirring until no bubbles appear in the slurry.

### Claim 4 (depends on 1)

The method for preparing the organic environment-friendly snow-melting agent according to claim 1, wherein a particle size of the salt mud in step (1) is in a range of 30-85 μm.

### Claim 5 (depends on 1)

The method for preparing the organic environment-friendly snow-melting agent according to claim 1, wherein when concentrated under reduced pressure, a vacuum degree is in a range of 0.06-0.09 MPa and a temperature is in a range of 70-80° C.

### Claim 6 (depends on 1)

The method for preparing the organic environment-friendly snow-melting agent according to claim 1, wherein the solid powder is subjected to roller granulation in step (3) to obtain the organic environment-friendly snow-melting agent in a particle size of 4-7 mm and a shape of ellipsoidal.