Multi-solid-waste large-mixing-amount utilization method

A large-volume, fly ash technology, applied in the direction of cement production, etc., can solve problems such as processing difficulties, achieve the effects of reducing environmental pollution, maintaining the ecological environment, and relieving the pressure of solid waste accumulation

Inactive Publication Date: 2020-11-06
张延年
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other solid wastes, alkali slag is more difficult to deal with because it contains a large amount of chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for utilizing multiple solid wastes in a large amount, wherein the solid wastes are limestone, alkali slag, fly ash, iron tailings, etc., and the solid wastes are used to prepare cement clinker. The specific steps are as follows:

[0038] (1) crush the limestone until the particle size is not greater than 2mm, and set aside; crush the iron tailings until the particle size is not greater than 2mm, and set aside;

[0039] (2) Take raw materials with the following mass fractions: 40% limestone, 30% alkali slag, 15% fly ash, 10% iron tailings, 5% river sand, mix evenly according to the proportion, and then grind to obtain the final mixture Medium particle size greater than 0.08mm shall not exceed 10% of the total weight;

[0040] (3) Put the raw material after grinding in (2) into the rotary kiln for calcination, the calcination temperature is 1450°C, and the calcination time is 40-45 minutes;

[0041] (4) Cool the raw materials calcined in (3) to room temperature...

Embodiment 2

[0043] A method for utilizing multiple solid wastes in a large amount, wherein the solid wastes are fly ash, and the solid wastes are used to prepare cement. The specific steps are as follows:

[0044] The following mass fractions of raw materials are taken: 25-45% cement clinker, 10-12% gypsum, 30-40% fly ash, 3-5% calcium hydroxide ball milled to a specific surface area of ​​350㎡ / kg, 80μm sieve residue ( mass fraction) ≤ 4% and then mixed uniformly to obtain cement.

Embodiment 3

[0046] A method for utilizing multiple solid wastes in a large amount, wherein the solid wastes are iron ore waste rocks, and the solid wastes are used to prepare concrete. The specific steps are as follows:

[0047] (1) Crush the waste iron ore and classify it according to the particle size of 4.75mm. The particle size greater than 4.75mm is coarse aggregate, and the particle size smaller than 4.75mm is fine aggregate;

[0048] (2) Raw materials with the following mass fractions: 15-18% cement, 40-50% coarse aggregate, 25-30% fine aggregate, 0.15-0.18% water reducing agent, 5-6% water;

[0049] (3) Stir the cement, coarse aggregate, and fine aggregate evenly for later use;

[0050] (4) Mix the water reducer with water, stir well and set aside;

[0051] (5) Put the mixture obtained in (3) and (4) into a mixer and stir for 2-3 minutes until the slurry is uniform to obtain concrete.

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Abstract

The invention discloses a multi-solid-waste large-mixing-amount utilization method, and belongs to the field of building material preparation; the multi-solid-waste large-mixing-amount utilization method is a utilization method of iron tailings, alkaline residues, fly ash and other solid wastes, and comprises the following specific steps: step 1, solid waste crushing: crushing iron ore waste rocks, grading according to 4.75 mm, using the crushed iron ore waste rocks with the particle size of more than 4.75 mm as coarse aggregates, and using the crushed iron ore waste rocks with the particle size of less than 4.75 mm as fine aggregates for later use; crushing iron tailings until the particle size is not greater than 2 mm for later use, and not treating alkaline residues for later use; step2, utilizing the treated solid waste for preparing any one of clinker, cement, concrete and baking-free bricks. The method has the beneficial effects that a large amount of various solid wastes including alkaline residues, coal ash, iron tailings and iron ore waste rocks can be consumed, the solid waste mixing amount is increased, raw materials are saved, the solid waste accumulation pressure is relieved, environmental pollution is reduced, large pieces of fertile farmland clay are saved, waste is turned into wealth, meanwhile, the urban ecological environment is maintained, and the balance state of the ecological environment is kept.

Description

technical field [0001] The invention relates to a large-volume utilization method of multiple solid wastes, which belongs to the field of building material preparation. Background technique [0002] Iron tailings, as the solid waste after ore beneficiation, are one of the bulk industrial solid wastes. As of 2019, my country has accumulatively stockpiled more than 60 billion tons of tailings, and it is estimated that an additional 1.6 billion tons will be generated each year, while the overall utilization rate is less than 20%. Stacking will seriously damage the surrounding ecological environment, and even desertification or secondary disasters will occur . Iron tailings is a composite mineral material with complex components, the main chemical components are silicon dioxide, aluminum oxide, iron oxide, calcium oxide and manganese oxide, etc., and a small amount of potassium oxide, sodium oxide, sulfur trioxide and phosphorus pentoxide, which can replace traditional raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B7/52C04B28/02
CPCC04B7/26C04B7/52C04B28/021C04B2111/00017C04B18/12C04B2103/302C04B18/08C04B22/064Y02P40/10
Inventor 张延年李志军陈志燕杜松岩董宁秦桂娟李琦琦陈昊刘柏男张文洁崔长青王亭张于于康楠王铁源闫明程于洋
Owner 张延年
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