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Preparation process for silicate cement clinker

A portland cement and preparation technology, which is applied in the field of cement manufacturing, can solve the problems of increased waste sand, increased cost of castings, waste of resources, etc., achieve huge social and economic benefits, solve the problem of reuse, and save firing The effect of energy consumption

Active Publication Date: 2019-03-08
EMEISHAN QIANGHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, my country's foundry industry has low technical level, high energy consumption, and long-standing problems of pollution emissions. The poor regenerability of limestone sand has led to a substantial increase in the amount of waste sand discharged from foundry production, and the cost of castings has increased. Casting companies rarely invest in recycling equipment. Leading to the discharge and dumping of tens of millions of tons of discarded molding sand every year, and it has become an increasing trend year by year. Not only does it occupy a large amount of stacking space, but also the composition of the molding sand is complex and alkaline. Seriously, it will cause groundwater pollution, threaten human health and cause serious waste of resources. , so it is of great social significance to study the reuse of limestone sand waste

Method used

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  • Preparation process for silicate cement clinker
  • Preparation process for silicate cement clinker
  • Preparation process for silicate cement clinker

Examples

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Embodiment 1

[0031] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0032] A preparation process for Portland cement clinker, comprising the following steps:

[0033] A. Material pretreatment step, use impact crusher to carry out primary crushing of limestone molding sand waste, and the crushed particles are less than 25mm; use ball mill to grind the limestone molding sand waste after primary crushing, and increase sorting after grinding Sieve, control the aperture of the sorting sieve to be 20 mesh, separate the limestone molding sand waste after grinding into the upper part of the sieve and the lower part of the sieve for subsequent use;

[0034] B. Raw material crushing step: silicon materials, calcium materials, iron materials and iron-aluminum materials are crushed by jaw crusher for primary crushing, and impact crushing is used for secondary crushing, and the particle size of the incoming abrasive is controlled ...

Embodiment 2

[0041] Further as a preferred embodiment, a preparation process of Portland cement clinker comprises the following steps:

[0042] Calcium material: limestone; Supplementary siliceous-calcium material: limestone molding sand waste, supplementary siliceous-calcium material is water glass limestone sand waste, water glass clay limestone sand waste, clay dry limestone sand waste; siliceous material contains : Quartz sand; iron-aluminum materials: sulfuric acid slag and aluminum ore waste rock.

[0043] A. Material pretreatment step, use impact crusher to carry out primary crushing of limestone molding sand waste, the gap between the grate bars in the feeding groove of the impact crusher is 500mm, and the raw materials are transported to the impact crusher through the belt conveyor, and the particles are broken The particle size is less than 25mm; use a ball mill to pre-grind limestone molding sand waste, add a sorting screen after grinding, control the aperture of the sorting scr...

Embodiment 3

[0050] Further as a preferred embodiment, prepare according to the process of above-mentioned embodiment 1 and embodiment 2, take limestone molding sand waste and carry out preliminary screening, the part on the sieve: the part under the sieve=9:1, the chemical composition of the component on the sieve is oxidized Calcium = 53.61%, magnesium oxide = 0.50%, alkali content = 0.11%, sulfur trioxide = 0.1%, silicon dioxide = 2.95%, so it is directly used as a substitute for limestone, under the sieve: quartz sand = 1:10 for mixing , and then carry out raw material batching according to the ratio. As shown in Table 3 below:

[0051]

[0052] table 3.

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Abstract

The invention discloses a preparation process for silicate cement clinker, and relates to the technical field of cement manufacturing. According to the invention, limestone moulding sand waste is applied to calcination of clinker to the greatest extent by adopting a limestone moulding sand waste harmful component stripping method, and limestone moulding sand waste partly or completely replace limestone. According to the invention, the limestone moulding sand waste is applied to the calcination of the cement clinker, so that cost of enterprises can be reduced, and waste is changed into things of value, and therefore, great social benefits and economic benefits are achieved for society and the enterprises.

Description

technical field [0001] The present invention relates to the technical field of cement manufacture, and more specifically relates to a preparation process of Portland cement clinker. Background technique [0002] Limestone molding sand is an important mold for casting molding in the foundry industry. It is made by mixing raw sand, binder and water in a certain proportion, and sometimes adding auxiliary materials such as coal powder or wood chips. According to statistics, about 1.2 tons of waste sand can be produced for every ton of qualified castings produced. There are at least tens of millions of tons of waste sand produced by casting, and the amount is very large. However, my country's foundry industry has low technical level, high energy consumption, and long-standing problems of pollution emissions. The poor regenerability of limestone sand has led to a substantial increase in the amount of waste sand discharged from foundry production, and the cost of castings has incr...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/38C04B7/42C04B7/43C04B7/44
CPCC04B7/24C04B7/38C04B7/421C04B7/434C04B7/44Y02P40/10
Inventor 张凌志喻庆华
Owner EMEISHAN QIANGHUA SPECIAL CEMENT
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