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Method for producing cement with little clinker by oil shale flyash

A technology of clinker cement and oil shale, which is applied in the field of preparation of less clinker cement, can solve the problems of large limestone and fuel consumption, and achieve the effects of reducing production costs, reducing energy consumption and environmental pollution, and reducing environmental pollution

Active Publication Date: 2007-11-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There have been decades of research on the comprehensive utilization technology of oil shale smelting residues at home and abroad, but the residues in the current utilization technology are mainly used as cement admixtures (up to 30%) and cement raw materials. Raw materials, etc., which consume a lot of limestone and fuel at the same time, and emit a lot of CO 2 and other pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1. Use a mill to grind the raw materials with larger particles, and the specific surface area of ​​each raw material after grinding reaches: oil shale fly ash 755m 2 / kg, cement clinker 297m 2 / kg, hemihydrate gypsum 420m 2 / kg, thenardite 276m 2 / kg, quicklime 391m 2 / kg, melamine-based superplasticizer 370m 2 / kg.

[0014] Step 2. Combine 21.5% cement clinker, 64% oil shale fly ash, 5.5% hemihydrate gypsum, 2.5% Glauber's salt, 6% quicklime and 0.5% melamine-based superplasticizer Mix and grind until the specific surface area is 530m 2 / kg, the strength and stability test results of the obtained mixed gelling material are shown in Table 1 according to the GB175-1999 standard.

[0015] Compressive strength (Mpa)

Embodiment 2

[0017] Step 1. Use a mill to grind the raw materials with larger particles, and the specific surface area of ​​each raw material after grinding reaches: oil shale fly ash 810m 2 / kg, cement clinker 335m 2 / kg, anhydrous gypsum 382m 2 / kg, sodium sulfate 305m 2 / kg, quicklime 441m 2 / kg, naphthalene series superplasticizer 412m 2 / kg.

[0018] Step 2. The mass percentage is 24.5% cement clinker, 64% oil shale fly ash, 6% anhydrite, 2% sodium sulfate, 3% quicklime and 0.5% naphthalene series superplasticizer Mix and grind together until the specific surface area is 520m 2 / kg, the strength and stability test results of the obtained mixed gelling material are shown in Table 2 according to the GB175-1999 standard.

[0019] Compressive strength (Mpa)

Embodiment 3

[0021] Step 1. Use a mill to grind the raw materials with larger particles into fine particles. After grinding, the specific surface area of ​​each raw material reaches: oil shale fly ash 723m 2 / kg, cement clinker 362m 2 / kg, anhydrous gypsum 453m 2 / kg, thenardite 279m 2 / kg, quicklime 339m 2 / kg, naphthalene series superplasticizer 453m 2 / kg.

[0022] Step 2. Combine 23.5% cement clinker, 63% oil shale fly ash, 8% anhydrite, 1% Glauber's salt, 4% quicklime and 0.5% naphthalene superplasticizer Mix and grind until the specific surface area is 497m 2 / kg, the strength and stability test results of the obtained mixed gelling material are shown in Table 3 according to the GB175-1999 standard.

[0023] Compressive strength (Mpa)

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Abstract

Production of cement with minor clinker has less environmental pollution. It utilizes oil shale smelting fly ash substituting with partial cement. It consists of oil shale fly ash 50-74 wt%, cement clinker 20-28 wt%, anhydrous gypsum or half-hydrous gypsum or dehydrated gypsum or devulcanized gypsum or fluorine gypsum or phosphor gypsum or their mixture 2-8 wt%, sodium sulfate or sal glauberi or their mixtures 1-4 wt%, caustic lime or carbide slag or their mixtures 2-8 wt%, efficient naphthalene water reducer or efficient trimeric cyanamide water reducer or efficient polycarboxylic acid or their mixture 0.1-2 wt%. It can get mixed gel materials with final specific area 480-680m2 / kg. It has less cement clinker and resources treatment.

Description

Technical field: [0001] The invention belongs to the field of building materials, in particular to a method for preparing clinker-less cement by using oil shale smelting fly ash to replace part of cement clinker. Background technique: [0002] At present, the supply of traditional crude oil in the world is becoming increasingly tense, and the crude oil stored in oil shale is getting more and more attention. Oil shale has become an important alternative energy source. The world's oil shale reserves are about 475 billion tons, which is equivalent to 5.4 times the proven natural crude oil recoverable reserves. China's oil shale reserves rank fourth in the world, and the proven oil shale reserves are 32.989 billion tons. The utilization of oil shale energy has a history of more than 70 years. [0003] Attracted by huge economic benefits and great development prospects, oil shale mining and refining technologies have developed rapidly in recent years. However, during oil shale ...

Claims

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Application Information

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IPC IPC(8): C04B7/30
CPCC04B28/14C04B7/30C04B2103/445C04B2111/00017C04B2111/00215Y02P40/10Y02W30/91C04B7/02C04B18/125C04B18/141C04B22/064C04B22/147C04B2103/302C04B24/223C04B24/226C04B24/2641
Inventor 倪文王海霞吴英良刘凤梅
Owner UNIV OF SCI & TECH BEIJING
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