# US 4,396,431 A · Process for preparing olivine sand cores and molds

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

- Number: US 4,396,431 A
- Document ID: US4396431A
- Status: Granted
- Kind: A
- Application number: 06/342,309
- Filed: 1982-01-25
- Granted: 1983-08-02
- Earliest claimed: 1982-01-25
- Assignees: International Minerals & Chemical Corp.
- Inventors: Charles E. Seeney; John F. Kraemer; Janis Ingebrigtsen
- Web page: https://patentgrep.com/patent/US4396431A

## CPC

- C04B 28/344: {the phosphate binder being present in the starting composition solely as one or more phosphates}
- C04B 28/346: {the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates}
- C04B 28/348: {the starting mixture also containing one or more reactive oxides}
- C04B 2103/14: Hardening accelerators
- C04B 2111/00939: {for the fabrication of moulds or cores}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

An inorganic cement binder for a foundry aggregate comprising, in combination, potassium olivine phosphate and as a hardener therefor, water, aqueous sodium silicate, or aqueous phosphoric acid.

## Claims

### Claim 1

An inorganic cement binder for a foundry aggregate comprising, in combination, potassium olivine phosphate, from 2 to 10% based on the weight of the aggregate, and as a hardener therefor from 2 to 10%, based on the weight of the aggregate, of water, aqueous sodium silicate, or aqueous phosphoric acid.

### Claim 2 (depends on 1)

The combination of claim 1 wherein the hardener is water.

### Claim 3 (depends on 1)

The combination of claim 1 wherein the hardener is aqueous sodium silicate.

### Claim 4 (depends on 1)

The combination of claim 1 wherein the hardener is aqueous phosphoric acid.

### Claim 5 (depends on 1)

A core or mold consisting essentially of a foundry aggregate and the binder-hardener combination of claim 1.

### Claim 6

An inorganic cement binder for a foundry aggregate comprising, in combination, a metal silico-phosphate, from 2 to 10% based on the weight of the aggregate, and as a hardener therefor, from 2 to 10% based on the weight of the aggregate, of water, aqueous sodium silicate, or aqueous phosphoric acid.

### Claim 7 (depends on 6)

The binder of claim 6 wherein the metal silico-phosphate is prepared from a zeolite, nepheline syenite or olivine and a metal dihydrogen phosphate.

### Claim 8 (depends on 6)

The binder of claim 6 wherein the metal dihydrogen phosphate is potassium dihydrogen phosphate.

### Claim 9 (depends on 6)

The binder of claim 6 wherein the metal dihydrogen phosphate is zinc dihydrogen phosphate.