Two-step chromium slag detoxification formula and synergistic process

A chromium slag and process technology, applied in the field of two-step chromium slag detoxification formula and synergistic process, can solve problems such as secondary pollution, and achieve the effects of avoiding poisoning danger, reducing heavy metal content, and simple and efficient energy utilization

Pending Publication Date: 2022-05-31
湖南国发控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since heavy metals cannot be decomposed and destroyed, they can only transfer their existing locations and change their physical and chemical forms. Using additional environmental protection equipment for treatment will not only easily cause secondary pollution, but also increase investment and production costs. Therefore, the process flow should be changed. Reducing the loss of heavy metals with wastewater is the fundamental problem

Method used

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  • Two-step chromium slag detoxification formula and synergistic process
  • Two-step chromium slag detoxification formula and synergistic process
  • Two-step chromium slag detoxification formula and synergistic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 As shown, the chromium slag detoxification process in the present embodiment comprises the following steps:

[0045] S1: Ingredients, mix 50% of chromium slag, 30% of red mud, 10% of potassium feldspar, and 10% of ferrous sulfate for granulation. The diameter of the material is 5-20mm, and it is dried to ensure that the obtained spherical material contains water. The drying rate does not exceed 10%, and the granulation rate reaches 99%. The heat used for drying can come from the heat of the firing section of the foamed ceramics, and enters the rotary kiln together with the materials.

[0046] S2: Put the pellets into the rotary kiln for high-temperature firing. The moisture content of the incoming material does not exceed 16%. The maximum temperature in the firing section of the kiln is 900°C, and the residence time is 2h. The flue gas in this step is recycled to the tunnel kiln. .

[0047] S3: Quenching the calcined light aggregate with water at 25°C...

Embodiment 2

[0074] Such as figure 1 As shown, the chromium slag detoxification process in the present embodiment comprises the following steps:

[0075] S1: Ingredients, mixing 40% of chromium slag, 35% of red mud, 15% of potassium feldspar, and 10% of sodium borohydride for granulation. The diameter of the material is 5-20mm, and it is dried to ensure that the obtained spherical material contains water. The drying rate does not exceed 10%, and the granulation rate reaches 99%. The heat used for drying can come from the heat of the firing section of the foamed ceramics, and enters the rotary kiln together with the materials.

[0076] S2: Put the pellets into the rotary kiln for high-temperature firing. The moisture content of the incoming material does not exceed 16%. The maximum temperature in the firing section of the kiln is 900°C, and the residence time is 2h. The flue gas in this step is recycled to the tunnel kiln. .

[0077] S3: Quenching the calcined light aggregate with water a...

Embodiment 3

[0088] Such as figure 1 As shown, the chromium slag detoxification process in the present embodiment comprises the following steps:

[0089] S1: Ingredients, mixing 60% of chromium slag, 35% of red mud, 12% of potassium feldspar, and 3% of manganese slag for granulation, the diameter of the discharge is 5-20mm, and drying treatment to ensure the moisture content of the obtained spherical material No more than 10%, the granulation rate reaches 99%, the heat used for drying can come from the heat of the firing section of the foamed ceramics, and enters the rotary kiln together with the materials.

[0090] S2: Put the pellets into the rotary kiln for high-temperature firing. The moisture content of the incoming material does not exceed 16%. The maximum temperature in the firing section of the kiln is 900°C, and the residence time is 2h. The flue gas in this step is recycled to the tunnel kiln. .

[0091] S3: Quenching the calcined light aggregate with water at 25°C, and the tre...

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Abstract

According to the two-step chromium slag detoxification formula and the synergistic process, under the technological process of a CO-free atmosphere, the purpose of stably, systematically and comprehensively detoxifying chromium slag is achieved through recycling of water, gas, solid and heat. The method comprises the following steps: 1, mixing the chromium slag with an aluminum-silicon concentrate and a compound additive, granulating, detoxifying the chromium slag at a high temperature of 900-1000 DEG C, desorbing part of heavy metals and harmful substances in flue gas at the temperature, and dissolving in water, so that water, flue gas and solids which exceed the standard are introduced into the next step; and 2, mixing the chromium slag, the clay, the rock-forming minerals, the foaming agent, the reducing agent and the inhibitor, firing the foamed ceramic at 1000-1200 DEG C, and thoroughly reducing and solidifying the heavy metals and harmful substances into the product at high temperature. Although no CO generates a reducing atmosphere, the risk of CO poisoning is avoided while the chromium slag treatment capacity is increased, flue gas recycling is more convenient and efficient, a very small amount of pollutants difficult to treat are solidified at high temperature through cooperation of water, gas, solid and heat, and a centralized and efficient collection process is formed.

Description

technical field [0001] The invention belongs to the technical field of solid waste, hazardous waste and resource utilization, and relates to a two-step chromium slag detoxification formula and a collaborative process. [0002] technical background [0003] Chromium slag is a hazardous waste containing heavy metals such as "hexavalent chromium", and is also a strong carcinogen announced by the World Health Organization. It is easily soluble in water, causing serious pollution to soil and water sources, and causing great harm to the growth of animals and plants and even human production and life. Nowadays, there are many studies on the control and treatment of chromium slag at home and abroad, but the cost of existing technologies is still high, and the processing capacity cannot meet the actual needs. How to make chromium slag harmless and utilize it as a resource, is the focus of research. [0004] Existing studies have shown that hexavalent chromium can be reduced to triva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/37A62D3/30A62D3/33A62D101/43
CPCA62D3/37A62D3/30A62D3/33A62D2101/43Y02P40/60
Inventor 黄强卢丰玉黄治齐
Owner 湖南国发控股有限公司
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