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Detoxification formula with high chromium slag amount and process for cooperating with light aggregate production

A formula and slag volume technology, which is applied in the production of ceramic materials, removal of solid waste, and other household appliances, can solve the problems of incineration system inoperability and tumors cannot be cleaned in time, so as to reduce nodules and shorten processing time , The effect of lowering the firing temperature

Active Publication Date: 2022-04-15
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

[0004] In addition, rotary kilns are generally used for high-temperature detoxification of chromium slag. In the second half of the rotary kiln body, the low-melting point substances in the material are in a semi-molten state and are easily attached to the inner wall of the kiln to form nodules. The continuous operation of production makes it impossible to clean up the tumor in time, and when the nodules are serious to a certain extent, the incineration system may not be able to operate

Method used

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  • Detoxification formula with high chromium slag amount and process for cooperating with light aggregate production
  • Detoxification formula with high chromium slag amount and process for cooperating with light aggregate production
  • Detoxification formula with high chromium slag amount and process for cooperating with light aggregate production

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Embodiment 1

[0045] This embodiment is a process for chromium slag detoxification and light aggregate production, including the following steps:

[0046] Step 1: Dry the chromium slag raw material to reduce its moisture content to 13%.

[0047] The second step: the raw materials are calculated by mass fraction, 75% of chromium slag, 4% of fly ash, 15% of red mud, 2% of potassium feldspar, 3% of coal, and 1% of ferrous sulfate for batching and mixing.

[0048] Step 3: Put the above mixture into a crusher for crushing, so that the moisture content is reduced to 10%.

[0049] Step 4: put the crushed material into a ball mill for crushing and grinding, the output particle size is 200 mesh, and the moisture content of the material after ball milling is 5%.

[0050] Step 5: Put the ball-milled material into the granulation disc for granulation, the discharge diameter is 5-20mm, the moisture content of the obtained spherical material is 12%, and the granulation rate reaches 99%.

[0051] Step 6...

Embodiment 2

[0080] This embodiment is a process for chromium slag detoxification and light aggregate production, including the following steps:

[0081] Step 1: Dry the chromium slag raw material to reduce its moisture content to 13%.

[0082] The second step: the raw materials are calculated by mass fraction, 80% of chromium slag, 4% of fly ash, 10% of red mud, 1% of potassium feldspar, 4% of coal, and 1% of ferrous sulfate for batching and mixing.

[0083] Step 3: Put the above mixture into a crusher for crushing, so that the moisture content is reduced to 10%.

[0084] Step 4: put the crushed material into a ball mill for crushing and grinding, the output particle size is 200 mesh, and the moisture content of the material after ball milling is 5%.

[0085] Step 5: Put the ball-milled material into the granulation disc for granulation, the discharge diameter is 5-20mm, the moisture content of the obtained spherical material is 12%, and the granulation rate reaches 99%.

[0086] Step 6...

Embodiment 3

[0097] This embodiment is a process for chromium slag detoxification and light aggregate production, including the following steps:

[0098] Step 1: Dry the chromium slag raw material to reduce its moisture content to 13%.

[0099] The second step: raw materials are calculated by mass fraction, 75% of chromium slag, 6% of fly ash, 12% of red mud, 2% of potassium feldspar, 3% of coal, and 2% of fly ash are used for batching and mixing. The source is waste incineration fly ash.

[0100] Step 3: Put the above mixture into a crusher for crushing, so that the moisture content is reduced to 10%.

[0101] Step 4: put the crushed material into a ball mill for crushing and grinding, the output particle size is 200 mesh, and the moisture content of the material after ball milling is 5%.

[0102] Step 5: Put the ball-milled material into the granulation disc for granulation, the discharge diameter is 5-20mm, the moisture content of the obtained spherical material is 12%, and the granul...

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Abstract

The invention relates to a high-chromium-slag detoxification formula and a synergistic light aggregate production process. The formula comprises the following raw materials in percentage by mass: 60-80% of chromium slag, 15-40% of aluminum-silicon concentrate and 1-5% of a compound additive. The aluminum-silicon concentrate comprises one or more of clay, potassium feldspar, quartz, aluminum oxide, flint clay, mullite and kaolinite. And the compound additive plays a role in reduction and fluxing. The raw materials are dried, metered, crushed, ball-milled, granulated, fired and screened to obtain a fired lightweight aggregate product. Compared with the prior art, the specific gravity of the chromium slag in the formula is increased to 80%, the firing temperature is reduced to 900-1000 DEG C on the basis that hexavalent chromium in the fired lightweight aggregate product is thoroughly reduced and cured by adding the compound additive, and trivalent chromium cannot be oxidized due to temperature reduction under the condition of no cooling process. On one hand, thorough harmlessness of the chromium slag is achieved, and on the other hand, complete recycling of the chromium slag is achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste, hazardous waste and resource utilization, and relates to a detoxification formula with high chromium slag content and a process for cooperating with light aggregate production. Background technique [0002] 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. [0003] Existing studies have shown that hexavale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/138C04B33/132C04B33/135C04B33/13C04B33/16C04B33/24C04B33/32B09B3/00
CPCC04B33/138C04B33/1327C04B33/131C04B33/16C04B33/135C04B33/1321C04B33/1324C04B33/132C04B33/1305C04B33/24C04B33/32C04B2235/3463C04B2235/3217C04B2235/658C04B2235/77C04B2235/96C04B2235/9607Y02P40/60Y02W30/91
Inventor 黄强卢丰玉黄治齐
Owner 湖南国发控股有限公司
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