# US 10,865,335 B2 · Quartz sand/graphite composite molten salt heat transfer and heat storage medium and preparation method thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,865,335 B2
- Document ID: US10865335B2
- Status: Granted
- Kind: B2
- Application number: 14/765,295
- Filed: 2014-01-21
- Published: 2015-12-24
- Granted: 2020-12-15
- Earliest claimed: 2013-02-01
- Assignees: Shenzhen Enesoon Science & Technology Co., Ltd
- Applicants: Shenzhen Enesoon Science & Technology Co., Ltd.
- Inventors: ZhiYong Zeng
- Web page: https://patentgrep.com/patent/US10865335B2

## CPC

- C09K 5/12: Molten materials, i.e. materials solid at room temperature, e.g. metals or salts
- 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 5/00: Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K 5/02: Materials undergoing a change of physical state when used (C09K5/16, C09K5/20 take precedence)
- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The present invention relates to the solar photo-thermal power generation technology. Provided is a quartz sand/graphite composite molten salt heat transfer and heat storage medium and a preparation method thereof. The medium is characterized in that it is prepared by adding quartz sand into an existing common heat transfer and heat storage molten salt system for compounding. Hot stability of the obtained heat transfer and heat storage medium is generally improved, an application temperature range is expanded, causticity is reduced, and a service life of a device is greatly prolonged. In addition, a material cost is low.

## Claims

### Claim 1

A heat transfer and storage medium comprising silica sand compounded with a heat transfer and storage molten salt system,
wherein a weight proportion of said silica sand in said heat transfer and storage medium is 10% to 50%,
said heat transfer and storage molten salt system selected from a group consisting of a binary nitrate molten salt system and a ternary nitrate molten salt system, wherein:
the binary nitrate molten salt system is a KNO3—NaNO2 system comprising, in relative parts by weight, 30-40 parts potassium nitrate, and 60-70 parts sodium nitrite; and
the ternary nitrate molten salt system is a KNO3—NaNO3—NaNO2 system selected from a group consisting of following formulas, in relative part by weight:
40 parts potassium nitrate, 15 parts sodium nitrate and 30 parts sodium nitrite;
80 parts potassium nitrate, 5 parts sodium nitrate and 10 parts sodium nitrite; and
60 parts potassium nitrate, 15 parts sodium nitrate and 50 parts sodium nitrite.

### Claim 2 (depends on 1)

The heat transfer and storage medium according to claim 1, wherein:
the weight proportion of said silica sand in said heat transfer and storage medium is 10% to 40%.

### Claim 3 (depends on 1)

The heat transfer and storage medium according to claim 1, wherein:
the weight proportion of said silica sand in said heat transfer and storage medium is 20% to 45%.

### Claim 4 (depends on 1)

The heat transfer and storage medium according to claim 1, wherein:
the weight proportion of said silica sand in said heat transfer and storage medium is 30% to 40%.