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A kind of iron tailing-free ceramsite and preparation method thereof

A technology for iron tailings and ceramsite, which is applied in the field of iron tailing-free ceramsite and its preparation, can solve problems such as energy waste, environmental pollution, increase production cost, etc. The effect of compressive strength

Active Publication Date: 2022-07-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the accumulation of iron tailings is too large, which affects environmental problems, the sintering step is often used in the production of ceramsite from iron tailings. Sintering will not only cause energy waste and pollute the environment, but sintering often requires large-scale sintering equipment for assistance. , which increases the production cost, so there are certain deficiencies

Method used

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  • A kind of iron tailing-free ceramsite and preparation method thereof

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Effect test

Embodiment 1

[0032] A non-burning ceramsite for iron tailings, in parts by weight, is composed of the following components: 60 parts of iron tailings, 20 parts of steel slag, 20 parts of fly ash, 10 parts of quicklime, 0.8 parts of dihydrate gypsum, and 0.8 parts of triethanolamine , 3 parts of sodium hydroxide, 3 parts of sodium silicate, and 5 parts of sodium bicarbonate.

[0033] The preparation method of the iron tailing-free ceramsite specifically includes the following steps.

[0034] Step 1. According to the corresponding parts by weight, weigh each component for later use.

[0035] Step 2. Use DHG-9075A type electric heating blast drying oven to dry the iron tailings and steel slag and control the water content within 1%, and use a 5kg laboratory ball mill to dry the iron tailings, steel slag, triethanolamine and dihydrate gypsum. The mixture is ground, and the time is controlled at 150-200 min, and the finely ground iron tailings are passed through a 300-mesh sieve to obtain fine...

Embodiment 2

[0040] A non-burning ceramsite for iron tailings, in parts by weight, is composed of the following components: 55 parts of iron tailings, 15 parts of steel slag, 15 parts of fly ash, 10 parts of quicklime, 0.5 part of dihydrate gypsum, and 0.5 part of triethanolamine , 2 parts of sodium hydroxide, 2 parts of sodium silicate, and 5 parts of sodium bicarbonate.

[0041] The preparation method of the iron tailing-free ceramsite specifically includes the following steps.

[0042] Step 1. According to the corresponding parts by weight, weigh each component for later use.

[0043] Step 2. Use DHG-9075A electric heating blast drying oven to dry the iron tailings and steel slag and control the water content to be within 1%. Use a 5kg laboratory ball mill to dry the iron tailings, steel slag, triethanolamine and dihydrate gypsum. The mixture is ground, and the time is controlled at 150-200 min, and the finely ground iron tailings are passed through a 300-mesh sieve to obtain fine powd...

Embodiment 3

[0048] A non-burning ceramsite for iron tailings, in parts by weight, is composed of the following components: 65 parts of iron tailings, 25 parts of steel slag, 25 parts of fly ash, 15 parts of quicklime, 1 part of dihydrate gypsum, and 1 part of triethanolamine , 4 parts of sodium hydroxide, 4 parts of sodium silicate, and 10 parts of sodium bicarbonate.

[0049] The preparation method of the unburned ceramsite for iron tailings includes the following steps: Step 1. Weigh each component according to the corresponding parts by weight for use.

[0050] Step 2. Use DHG-9075A electric heating blast drying oven to dry the iron tailings and steel slag and control the water content to be within 1%. Use a 5kg laboratory ball mill to dry the iron tailings, steel slag, triethanolamine and dihydrate gypsum. The mixture is ground, and the time is controlled at 150-200 min, and the finely ground iron tailings are passed through a 300-mesh sieve to obtain fine powder.

[0051] Step 3. Mi...

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Abstract

The invention relates to the technical field of building materials and ceramsite preparation. An iron tailing-free ceramsite is composed of the following components in parts by weight: 55-65 parts of iron tailings, 15-25 parts of steel slag, and 15-25 parts of fly ash parts, 10-15 parts of quicklime, 0.5-1 part of dihydrate gypsum, 0.5-1 part of triethanolamine, 2-4 parts of sodium hydroxide, 2-4 parts of sodium silicate, and 5-10 parts of sodium bicarbonate. The preparation method is as follows: the iron tailings are ball-milled to a particle size of less than 300 meshes, disintegrated under the action of a strong alkaline solution of sodium silicate and sodium hydroxide, releasing active ions and reacting with the alkaline components in the solution to form a gel. At the same time, adding sodium bicarbonate, which is thermally decomposed in the process of steam curing, produces carbon dioxide gas, which is fixed in the matrix. After the final curing, an internal porous non-fired ceramic is formed. grain. The preparation method does not need to adopt a sintering process, and the obtained ceramsite has good performance in all aspects, solves the problems of tailings treatment and stacking to a large extent, and conforms to the sustainable development strategy of ecological environment protection.

Description

technical field [0001] The invention relates to the technical field of building materials and ceramsite preparation, in particular to an iron tailing-free ceramsite and a preparation method thereof. Background technique [0002] Tailings are wastes discharged in slurry form after ore is crushed, beneficiated and processed to form concentrates. The iron tailings with the largest accumulation in my country, 2.5-3.0t iron tailings are discharged for every 1t iron concentrate produced, accounting for 1 / 3 of the total iron tailings, and its utilization rate is low, most iron tailings use Landfill treatment has formed a large number of iron tailings ponds. Iron tailings need to occupy more land to build iron tailings ponds for stockpiling, which not only occupies land, but also makes the lack of land resources around the iron tailings ponds lead to hidden dangers of pollution, and consumes a lot of resources. At present, the comprehensive utilization rate of tailings in my countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02C04B18/12C04B18/14C04B18/08
CPCC04B18/027C04B18/021C04B18/12C04B18/142C04B18/08C04B22/064C04B22/143C04B22/062C04B12/04C04B22/106Y02W30/91
Inventor 宁宝宽苏文轩顾晓薇那芳溪张文馨刘剑平
Owner SHENYANG POLYTECHNIC UNIV