CN-117447102-B - Cement clinker prepared from water-based rock debris, method and application

Abstract

The invention provides cement clinker prepared by water-based rock chips, a method and application thereof, wherein the method comprises the steps of uniformly mixing the water-based rock chips and a carbonate modifier according to a first preset mass ratio to obtain a water-based rock chip mixture; mixing water-base rock dust mixture, calcareous raw material, siliceous raw material and ferrous raw material according to a second preset mass ratio to obtain kiln-entering raw material, calcining kiln-entering raw material and preparing cement clinker. The preparation method provided by the invention adopts the carbonate modifier to inhibit the adverse effect caused by sulfate in the water-based rock debris, greatly reduces the adverse effect of the water-based rock debris on a cement calcination system, improves the cement calcination efficiency, improves the doping amount of the water-based rock debris as kiln-entering raw material, and can improve the doping amount to 10% of the raw material ratio.

Inventors

• TAN SHUCHENG
• ZHANG HAOXING
• LUO QIAN
• WANG XIN
• LI ZEDONG
• TANG HUA
• WANG KONG
• WEI XIN
• WANG JIANGNAN
• CHEN LIANG

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团川庆钻探工程有限公司
• 四川蜀渝石油建筑安装工程有限责任公司

Dates

Publication Date

20260508

Application Date

20220719

Claims (7)

1. 1. A method for preparing cement clinker from water-based cuttings, the method comprising the steps of: Uniformly mixing water-based rock debris and a carbonate modifier according to a first preset mass ratio to obtain a water-based rock debris mixture, wherein the carbonate modifier comprises strontium carbonate; Mixing the water-based rock debris mixture, the calcareous raw material, the siliceous raw material and the iron raw material according to a second preset mass ratio to obtain kiln-entering raw material; calcining kiln raw materials to prepare cement clinker; the first preset mass ratio of the water-based rock debris to the carbonate modifier is 100 (0.1-1); The mass percentage of strontium carbonate in the carbonate modifier is more than 97%; the second preset mass ratio of the water-based rock debris mixture to the calcium raw material to the siliceous raw material to the iron raw material is (5-10), 75-80, 5-10 and 0.5-1.5.
2. 2. The method of producing cement clinker using water-based cuttings as claimed in claim 1, wherein the calcareous raw material is limestone.
3. 3. The method of producing cement clinker using water-based cuttings of claim 1, wherein the siliceous raw material is at least one of shale, sandstone and yellow sand.
4. 4. The method of producing cement clinker using water-based rock cuttings as claimed in claim 1, wherein the ferrous material is at least one of copper slag, sulfuric acid slag and sulfur slag.
5. 5. The method for preparing cement clinker by using water-based rock fragments according to claim 1, wherein the water-based rock fragment mixture is subjected to grinding treatment before kiln entry raw materials are prepared, the grain size of the water-based rock fragment mixture is controlled to be less than 12% by a 0.08mm square hole sieve, and less than 1% by a 0.2mm square hole sieve.
6. 6. A cement clinker prepared from water-based rock debris, wherein the cement clinker is prepared by the method for preparing cement clinker according to any one of claims 1 to 5.
7. 7. Use of the cement clinker according to claim 6 for the preparation of portland cement.

Description

Cement clinker prepared from water-based rock debris, method and application Technical Field The invention relates to the technical field of resource treatment of drilling cuttings, in particular to a method for preparing cement clinker by using water-based cuttings, cement clinker prepared by using water-based cuttings and an application method of cement clinker prepared by using water-based cuttings. Background In recent years, with the increasing exploitation of oil and gas resources, the yield of the auxiliary waste of the oil and gas resources is increasing. In large scale hydrocarbon production processes, the drilling process will produce a significant amount of drilling cuttings. The drilling cuttings have complex composition, contain inorganic salts, alkali, heavy metal ions and the like, and are easy to pollute surface water and underground water resources. The disposal of solid waste of drilling cuttings becomes one of the bottlenecks restricting the development of oil and gas exploration in China, and the development of effective resource utilization technology of the drilling cuttings is urgent. The most practical resource utilization ways are divided into three kinds, ① for preparing baking-free bricks, ② for preparing sintered bricks and ③ for preparing road materials. However, under the control of the national macro policy, the number of brickwork enterprises is continuously reduced, and the scale of drilling cuttings handled by brickwork cannot meet the increasing drilling cuttings handling requirements. The disposal amount of the road material prepared from the drilling cuttings is limited, and the drilling cuttings cannot be consumed on a large scale for a long time. Some cement enterprises currently use drilling cuttings as cement raw materials and have formed some methods for preparing cement or cement clinker from water-based cuttings. For example, the Chinese patent document with publication No. CN108129041A discloses a method for firing cement by using drilling cuttings, which is disclosed in 2018, 6 and 8 as a method for calcining Portland cement clinker by using oil-based drilling cuttings, the method comprises the steps of uniformly mixing limestone, high-iron aluminum waste stone, pretreated diesel-based drilling rock scraps and nonferrous metal slag according to a certain proportion, grinding to prepare raw materials, feeding the raw materials into a novel dry rotary kiln, calcining at high temperature, and cooling to obtain clinker. The invention name disclosed in 21 st 2 months in 2020 is cement fired by using drilling cuttings, a method and application thereof, and Chinese patent literature with publication number CN110818291A describes a method for firing cement by using drilling cuttings, wherein the method comprises the following steps of firstly carrying out solid-liquid separation on drilling cuttings slurry to obtain solid-phase drilling cuttings, and pouring the drilling cuttings into a cuttings pool; stirring and crushing drill cuttings and fly ash, homogenizing, determining the content of chemical components in the product, controlling the proportion, and adding the mixture into a cement production process to obtain cement. Because drilling cuttings (e.g., water-based cuttings) contain a significant amount of BaSO 4, there are problems in current widespread use in the cement industry that (1) the introduction of excessive sulfur elements into the cement raw materials can affect the proper operation of the cement calcination system, such as causing skinning and plugging, looping, etc. within the equipment. (2) The introduction of excessive sulfur elements into the cement raw materials can affect the liquid phase quantity in the kiln, affect the formation of main mineral phases of cement clinker, and reduce the strength of the cement clinker. Because the components of the drilling cuttings are complex, most cement enterprises control the mixing amount of the drilling cuttings to be less than 3% of the raw material ratio so as to reduce the negative influence caused by the drilling cuttings. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the purposes of the present invention is to provide a cement clinker prepared by using water-based rock fragments, a method and an application thereof, so as to solve the adverse effects caused by low water-based rock fragments and realize the purpose of maximally improving the water-based rock fragments. In order to achieve the above object, the present invention provides a method for preparing cement clinker by using water-based rock chips, which comprises the steps of uniformly mixing water-based rock chips and a carbonate modifier according to a first predetermined mass ratio to obtain a water-based rock chip mixture, mixing the water-based rock chip mixture, a calcareous raw material, a siliceous raw material and an iron raw materia