Method for comprehensive utilization of high-arsenic heavy metal sludge and iron slag and manganese slag

A technology of heavy metal sludge, iron and manganese, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as restricting the sustainable development of enterprises, increasing the cost of stacking waste residue, and easily entering the atmosphere. To achieve the effect of resource utilization, stable internal structure of finished products, and prolonged standing time

Active Publication Date: 2017-12-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stacking of large quantities of manganese slag will inevitably occupy a large area of ​​land, which increases the cost of stacking waste slag, increases the production cost of the enterprise, and restricts the sustainable development of the enterprise.
And because the waste manganese slag contains a certain amount of harmful substances, if it is piled up for a long time without utilization, some harmful elements will permeate through the soil layer after being exposed to the sun and washed by rain, so that the soil near the slag pile will be acidified and hardened.
In addition, the waste manganese slag stacked in the open air is easy to float with the wind after a long time of air drying and spread to far away places. Because the waste slag particles are relatively small, the waste slag can easily enter the atmosphere, which not only pollutes the environment, but also affects human health. make an impact
It can be seen that if the manganese slag is not used rationally, it will cause serious harm. Therefore, how to deal with it has become a research hotspot in the electrolytic manganese industry and the field of environmental protection and an arduous task that needs to be solved urgently.

Method used

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  • Method for comprehensive utilization of high-arsenic heavy metal sludge and iron slag and manganese slag
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  • Method for comprehensive utilization of high-arsenic heavy metal sludge and iron slag and manganese slag

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: in the present embodiment, the composition of iron slag is as shown in table 1,

[0029]

[0030] A method for comprehensive utilization of high-arsenic heavy metal sludge and iron-manganese slag, the specific steps are:

[0031] (1) Crush the iron slag until the particle size is not greater than 2mm, add water and mix evenly, the iron slag is hot stewed steel slag, the mass ratio of water to iron slag is 0.12:1, and the temperature is 70°C, under the condition of sealing, constant temperature and constant Cool to room temperature after wet curing for 3 hours to obtain pretreated iron slag;

[0032] (2) Crush the manganese slag until the particle size is not greater than 2mm, add water and mix evenly, in which the mass ratio of water to manganese slag is 0.2:1, keep at a temperature of 70°C and under sealed conditions for 3 hours at constant temperature and humidity, and then cool to room temperature Obtain pretreated manganese slag;

[0033] (3) High...

Embodiment 2

[0037] Embodiment 2: in the present embodiment, the composition of iron slag is as shown in table 4,

[0038]

[0039] A method for comprehensive utilization of high-arsenic heavy metal sludge and iron-manganese slag, the specific steps are:

[0040] (1) Crush the iron slag until the particle size is not greater than 1.8mm, add water and mix evenly, the iron slag is hot stewed steel slag, the mass ratio of water to iron slag is 0.15:1, and the temperature is 95°C, under the condition of sealing, constant temperature After 8 hours of constant humidity curing, cool to room temperature to obtain pretreated iron slag;

[0041] (2) Crush the manganese slag until the particle size is not greater than 1.8mm, add water and mix evenly, in which the mass ratio of water to manganese slag is 0.23:1, under the condition of sealing at a temperature of 95°C, maintain constant temperature and humidity for 8 hours and then cool to room temperature to obtain pretreated manganese slag;

[0...

Embodiment 3

[0046] Embodiment 3: in the present embodiment, the composition of iron slag is as shown in table 7,

[0047]

[0048] A method for comprehensive utilization of high-arsenic heavy metal sludge and iron-manganese slag, the specific steps are:

[0049] (1) Crush the iron slag until the particle size is not greater than 1.5mm, add water and mix evenly, the iron slag is hot stewed steel slag, the mass ratio of water to iron slag is 0.18:1, and the temperature is 80°C, under the condition of sealing, constant temperature After 5 hours of constant humidity curing, cool to room temperature to obtain pretreated iron slag;

[0050] (2) Crush the manganese slag until the particle size is not greater than 1.5mm, add water and mix evenly, in which the mass ratio of water to manganese slag is 0.25:1, under the condition of sealing at a temperature of 80°C, keep at constant temperature and humidity for 5 hours and then cool down to room temperature to obtain pretreated manganese slag; ...

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Abstract

The invention relates to a method for comprehensive utilization of high-arsenic heavy metal sludge and iron slag and manganese slag, and belongs to the technical field of resource utilization of industrial solid waste. The high-arsenic heavy metal sludge, cement, the iron slag and the manganese slag are solidified, the pH value of an acid solution is controlled to 2.3 and 4.5, the surface of the iron slag and the manganese slag is positively charged, arsenic in the form of negative ions reaches the surface of the slag through electrostatic attraction, and chemically reacts with Mn-OH, alpha-FeOOH and alpha-Fe2O3 to form an internal layer coordination complex, that arsenic and other heavy metals are solidified under combined action of the cement, an activator and an admixture, and prepared into bricks by mixed casting and vibratory pressing, and high compressive strength, low metal leaching rate and high-strength curing bricks can be obtained by curing maintenance.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of high-arsenic heavy metal sludge and iron-manganese slag, and belongs to the technical field of resource utilization of industrial solid waste. Background technique [0002] With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, the pollution of heavy metals in sludge is becoming more and more serious. With the rapid development of economic globalization, pollutants containing heavy metal arsenic are only stacked in the open air, which will not only occupy a large amount of land, but also pollute the stacked land, causing soil pollution, threatening human health and environmental safety, and soil heavy metal arsenic Pollution has the characteristics of concealment, long-term and irreversibility. [0003] Steel slag is the waste slag produced in the steelmaking process, and its quantity is produced on a large sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/14C04B18/04B28B11/24
CPCB28B11/247C04B18/0418C04B18/142C04B18/144C04B28/00C04B2201/50C04B12/04C04B18/146C04B22/0046C04B22/147C04B24/24C04B22/124C04B24/122Y02W30/91
Inventor 祝星李勇王华祁先进李勋徐媛韦龙华蔡贵远
Owner KUNMING UNIV OF SCI & TECH
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