Iron tailing-based building block and preparation method thereof

A technology of iron tailings and iron tailings powder, which is applied in the field of building materials, can solve the problems of high alkalinity and unfavorable survival of aquatic animals and plants, and achieve the effects of high utilization rate, less physical and chemical interaction, and good designability

Active Publication Date: 2020-11-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Commonly used Portland cement-based blocks for retaining walls have high alkalinity, and the presence of hydration product portlandite makes the internal pH of the blocks above 12.0, which is not conducive to the survival of most aquatic animals and plants

Method used

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  • Iron tailing-based building block and preparation method thereof
  • Iron tailing-based building block and preparation method thereof
  • Iron tailing-based building block and preparation method thereof

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preparation example Construction

[0087] A method for preparing an iron tailings-based block comprises the following steps.

[0088] Step 1. Weighing: According to the set ratio, weigh the pretreated residual slurry, iron tailings powder, iron tailings sand, cationic starch and mixing water in sequence, and add them to the wheel mill mixer in sequence.

[0089] Step 2, wheel milling for 3-10 minutes.

[0090] Step 3. Forming: The mixed raw materials are pressed and formed by wheel milling to form a hollow block blank; wherein, the forming pressure is 30-50 MPa, and the pressure is kept for 30-60 seconds.

[0091] The design of the above molding pressure and the design of Blaine’s specific surface area and fineness modulus in the raw materials will make the pretreated residual slurry, iron tailings powder, iron tailings sand, cationic starch and mixing water reach the optimum under the designed pressure. The contact surface is conducive to sufficient contact hardening reaction and makes the structure denser. ...

Embodiment 1

[0102] A method for preparing an iron tailings-based block comprises the following steps.

[0103] Step 1. Weighing: According to the set ratio, weigh 20 parts of pretreated residual slurry, 15 parts of iron tailings powder, 120 parts of iron tailings sand, 2 parts of cationic starch and 16 parts of mixing water, and add them to the wheel mill in sequence Mixer; wherein, the Blaine specific surface area of ​​the pretreated residual slurry is 400m 2 / kg; Blaine specific surface area of ​​iron tailings powder is 400m 2 / kg; the fineness modulus of the iron tailings sand is 2.0; the mixing water adopts the moisture content of the pretreated residual slurry during the dehydration pretreatment;

[0104] Step 2, wheel milling for 10 minutes;

[0105] Step 3. Forming: The mixed raw materials are pressed and formed by wheel milling to form a hollow block blank; wherein, the forming pressure is 30 MPa, and the pressure is kept for 30 seconds.

[0106] Step 4, standing still: stack t...

Embodiment 2

[0109] A method for preparing an iron tailings-based block comprises the following steps.

[0110] Step 1. Weighing materials: according to the set ratio, weigh 10 parts of pretreated residual slurry, 20 parts of iron tailings powder, 60 parts of iron tailings sand, 0.6 parts of cationic starch and 5 parts of mixing water, and add them to the wheel mill in sequence Mixer; wherein, the Blaine specific surface area of ​​the pretreated residual slurry is 450m 2 / kg; Blaine specific surface area of ​​iron tailings powder is 450m 2 / kg; the fineness modulus of iron tailings is 1.8; the mixing water adopts the moisture content of the pretreated residual slurry during dehydration pretreatment;

[0111] Step 2, wheel milling for 3 minutes;

[0112] Step 3. Forming: Press and form the mixed raw materials by wheel grinding to form a hollow block blank; wherein, the forming pressure is 50 MPa, and the pressure is maintained for 60 seconds;

[0113] Step 4, standing still: stack the fo...

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Abstract

The invention discloses an iron tailing-based building block and a preparation method thereof, and belongs to the field of building materials, the iron tailing-based building block comprises the following substances in parts by mass: 10-20 parts of pretreated residual slurry, 10-20 parts of iron tailing powder, 40-120 parts of iron tailing sand, 0.6-2 parts of cationic starch, and 5-16 parts of mixing water; the preparation process comprises the steps of burdening, compression molding, setting, standing, curing, taking out of a kettle, inspecting, stacking finished products and the like. The building block has the functions of facilitating plant growth, purifying water quality and maintaining ecological balance of water in a region, and can be used as a retaining wall building block; the used main raw materials are wastes, so that efficient resource utilization of the wastes is realized, and the production process has no influence on the environment.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an iron tailings-based building block and a preparation method thereof. Background technique [0002] The residual slurry of pipe piles and centrifugal square piles is a kind of waste discharged in the centrifugal process. According to statistics, 1m 3 The pipe pile concrete is centrifuged to produce about 0.05m 3 of residual pulp. my country is a big country in the production of pipe piles. In 2018, the output of concrete pipe piles reached 321 million meters, and the remaining slurry was about 16 million m 3 . The main components of the newly generated residual slurry are cement, a small amount of hydration products, powder in fine aggregates and water; after being sealed for a certain period of time, the residual slurry is mainly composed of hardened cement stone, unhydrated cement particles, Powder and water involved in the reaction. At present, there are three main wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B111/20
CPCC04B28/105C04B2111/00017C04B2111/00758C04B2111/20C04B2201/50C04B18/12C04B18/16C04B18/0418C04B24/38C04B40/0231C04B40/0263
Inventor 张风臣周靖靖张坤
Owner HOHAI UNIV
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