US4299634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of raw mix for the production of cement and sulphuric acid
Assignee: Patheon Austria GmbH and Co KG
•
Filing: 1980-10-21
•
Granted: 1981-11-10
•
Expires: 2000-10-21
Abstract
Abstract Preparation of a raw mix for use in the production of cement and sulphuric acid by the cement-sulphuric acid process, wherein coke is comminuted to a degree that at most 10% by weight of the coke has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, but at least 60% by weight has a particle size greater than 0.2 mm, after which the thus comminuted coke is mixed with a mixture, of fine particle size, comprising calcium sulphate and the remaining additives.
Inventors
- 👤 Josef Hutter
- 👤 Heinz Goller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:09
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/02; C04B7/04; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/745
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
106 words
In a process for the preparation of a raw mix suitable for use in the production of cement and sulphuric acid by the cement-sulphuric acid process the improvement comprising comminuting coke to a degree that at most 10% by weight of the coke has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size greater than 0.2 mm, after which the thus comminuted coke is mixed with a mixture, of fine particle size, comprising calcium sulphate and the remaining additives.
Claim 2
Dependent Claim
106 words
In a process for the preparation of a raw mix suitable for use in the production of cement and sulphuric acid by the cement-sulphuric acid process the improvement comprising comminuting coke to a degree that at most 10% by weight of the coke has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size greater than 0.2 mm, after which the thus comminuted coke is mixed with a mixture, of fine particle size, comprising calcium sulphate and the remaining additives.
Claim 3
Dependent Claim
51 words
A process according to claim 1, in which the coke is comminuted to a degree of comminution such that at most 40% by weight of the coke has a particle size of less than 1 mm and at least 70% by weight has a particle size of less than 5 mm.
Claim 4
Dependent Claim
35 words
A process according to claim 1, in which the coke is comminuted to a degree of comminution such that at least 60% by weight thereof has a particle size of between 10 and 20 mm.
Claim 5
Dependent Claim
112 words
In a process for the production of sulphuric acid and cement by the cement sulphuric acid process, which comprises using a raw mix comprising calcium sulphate, coke and other additives and heating it at 1,400° to 1,450° C. in a rotary kiln to obtain cement clinker and sulfurdioxide, the improvement wherein the coke component of the raw mix has a particle size spectrum such that at most 10% by weight has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size of more than 0.2 mm.
Claim 6
Dependent Claim
112 words
In a process for the production of sulphuric acid and cement by the cement sulphuric acid process, which comprises using a raw mix comprising calcium sulphate, coke and other additives and heating it at 1,400° to 1,450° C. in a rotary kiln to obtain cement clinker and sulfurdioxide, the improvement wherein the coke component of the raw mix has a particle size spectrum such that at most 10% by weight has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size of more than 0.2 mm.
Claim 7
Dependent Claim
51 words
A process according to claim 4 in which the coke component of the raw mix has a particle size spectrum such that at most 40% by weight has a particle size of less than 1 mm and at least 70% by weight has a particles size of less than 5 mm.
Claim 8
Dependent Claim
40 words
A process according to claim 4 in which the coke component of the raw mix has a particle size spectrum such that at least 60% by weight of the coke has a particle size of between 10 and 20 mm.
Claim 9
Dependent Claim
47 words
A process according to claim 4 in which the raw mix is preheated by a suspension-type heat exchanger which is connected with the rotary kiln, before being fed into said kiln, the gaseous atmosphere of said heat exchanger having an oxygen content of 0.6 to 2.0 Vol%.
Claim 10
Dependent Claim
63 words
A composition which comprises ground calcium sulphate and coke, having a particle size spectrum such that at most 10% by weight has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size of more than 0.2 mm.
Claim 11
Dependent Claim
63 words
A composition which comprises ground calcium sulphate and coke, having a particle size spectrum such that at most 10% by weight has a particle size of less than 0.1 mm and at least 90% by weight has a particle size of less than 20 mm, with the proviso that at least 60% by weight has a particle size of more than 0.2 mm.
Claim 12
Dependent Claim
46 words
A composition according to claim 8, in which the coke has a particle size spectrum such that at most 40% by weight has a particle size of less than 1 mm and at least 70% by weight has a particle size of less than 5 mm.
Claim 13
Dependent Claim
32 words
A composition according to claim 8, in which the coke has a particle size spectrum in which at least 60% by weight has a particle size of between 10 and 20 mm.
References Cited (Backward Citations)
DE1671215A1
Cited
US4040853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |