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Composite cement and preparation method thereof

A technology for compounding cement and cement clinker, applied in cement production, etc., can solve the problems of low activity, low added value, and easy volatility of heavy metals, and achieve the effects of inhibiting the dissolution of heavy metals, excellent physical properties, and promoting strength growth

Inactive Publication Date: 2018-06-15
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since heavy metals such as Pb contained in lead-zinc industrial waste are easy to volatilize at high temperature, the problem of secondary pollution of heavy metals used for burning clinker is not yet clear, and the amount of use in raw material ingredients is small, and the added value is low. widely used in the cement industry
Using lead-zinc industrial waste as a mixed material to prepare cement is the simplest way to use this type of solid waste in cement. However, due to its low activity and the risk of heavy metal dissolution has not been resolved, this type of waste has not been used as a cement mixing material. Application related reports

Method used

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  • Composite cement and preparation method thereof
  • Composite cement and preparation method thereof

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Embodiment 1

[0065] One embodiment of the present invention proposes a kind of preparation method of composite cement, it comprises:

[0066] Mix 20 parts of lead-zinc slag and 10 parts of limestone and grind until the specific surface area is 550±50m 2 / kg, to get the mixed components;

[0067] Mix 65 parts of cement clinker and 5 parts of natural anhydrite, and grind until the specific surface area is 360±20m 2 / kg, to obtain the clinker component;

[0068] The mixing component and the clinker component are mixed in a weight ratio of 3:7 to obtain composite cement.

[0069] Another embodiment of the present invention provides a composite cement prepared by the method of Embodiment 1. The physical properties of the composite cement were tested according to GB / T17671 and GB / T 1346, and the heavy metal dissolution rate of the composite cement was tested according to GB / T 30810. The test results are shown in Table 1.

Embodiment 2

[0071] One embodiment of the present invention proposes a kind of preparation method of composite cement, it comprises:

[0072] Mix 20 parts of lead-zinc slag, 10 parts of slag, 15 parts of calcareous lead-zinc tailings, 51 parts of cement clinker and 4 parts of anhydrite, and grind them together until the specific surface area is 400±20m 2 / kg to obtain composite cement.

[0073] Another embodiment of the present invention provides a composite cement prepared by the method of Embodiment 2. The physical properties of the composite cement were tested according to GB / T17671 and GB / T 1346, and the heavy metal dissolution rate of the composite cement was tested according to GB / T 30810. The test results are shown in Table 1.

Embodiment 3

[0075] One embodiment of the present invention proposes a kind of preparation method of composite cement, it comprises:

[0076] Mix 20 parts of lead-zinc slag, 10 parts of fly ash, 12 parts of dolomite, 44 parts of cement clinker and 4 parts of phosphogypsum, and grind them together until the specific surface area is 420±20m 2 / kg to obtain composite cement.

[0077] Another embodiment of the present invention provides a composite cement prepared by the method of Embodiment 3. The physical properties of the composite cement were tested according to GB / T17671 and GB / T 1346, and the heavy metal dissolution rate of the composite cement was tested according to GB / T 30810. The test results are shown in Table 1.

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Abstract

The invention relates a composite cement and a preparation method thereof. The composite cement includes: 40-70% of cement clinker; 3-8% of gypsum; 22-53% of waste residue, which is at least one of lead-zinc residue, slag, copper slag and fly ash; 8-22% of a carbonatic raw material; 0-10% of a quartziferous component, which is at least one of lead-zinc tailings, iron tailings, quartz sand and aeolian sand; and 0-4% of an excitation component. Specifically, the composite cement includes at least one of lead-zinc residue and lead-zinc tailings. According to the invention, lead-zinc industrial wastes is applied to preparation of composite cement, and the prepared composite cement has good physical properties and low heavy metal dissolution amount.

Description

technical field [0001] The invention relates to the field of cement preparation, in particular to a composite cement and a preparation method thereof. Background technique [0002] Lead and zinc are the non-ferrous metals with the largest consumption after copper and aluminum, while my country is the country with the highest lead and zinc production in the world. At the same time, my country's lead-zinc industry discharges a large amount of industrial waste every year, mainly including lead-zinc tailings and lead-zinc smelting slag. The former is the waste left after beneficiation. According to the composition, it can be divided into two types: carbonic lead-zinc tailings and siliceous lead-zinc tailings. The main mineral components in carbonate lead-zinc tailings are carbonate minerals, such as limestone, dolomite, etc., while the most important mineral component in siliceous lead-zinc tailings is silica. Lead-zinc smelting slag is the high-temperature waste slag discharg...

Claims

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Application Information

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IPC IPC(8): C04B7/21C04B7/26
CPCC04B7/21C04B7/26Y02P40/10
Inventor 汪智勇张文生叶家元任雪红张洪滔
Owner CHINA BUILDING MATERIALS ACAD
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