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Method for preparing active slag powder by utilizing chromium slag and chromium sludge

A chromium sludge and chromium slag technology, applied in cement production, clinker production and other directions, can solve problems such as environmental and social pollution and harm, soil pollution in chromium slag storage sites, and hexavalent chromium excessive pollution and diffusion, and achieve simplified The effect of dust removal, large resource utilization, and long life durability

Active Publication Date: 2015-04-08
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is highly oxidizing and mobile, can poison surface water and groundwater, destroy the original structure of the soil and the ecosystem of the soil, and cause great pollution and harm to the environment and society
The reason is that the chromium slag after dry detoxification is used as cement admixture, because the so-called main active mineral dicalcium silicate is β-C at about 600°C in slow cooling. 2 S crystal form transforms into γ-C 2 S does not have room temperature hydration activity, the actual activity is poor, and periclase, etc. cause poor stability, and the problem of the dry detoxification process control method used leads to the actual detoxification is not complete, and after detoxification, part of the trivalent chromium is re-oxidized and reversed to Cr(VI) is toxic
And another method of using chromium slag to replace cement to produce part of the raw material ingredients to make cement clinker, because the actual control in the dry-process cement production rotary kiln must be an oxidative atmosphere to stabilize the kiln condition and burn out high-quality clinker, which is actually unsolvable. Toxic, leading to the spread of hexavalent chromium in cement exceeding the standard pollution
[0008] On the other hand, the chromium slag storage site and its surrounding soil have actually been seriously polluted, and even the Cr(VI) content in the soil at a depth of tens of meters exceeds the standard by tens to hundreds of times. So far, no practical treatment technology has been found for effective disposal. Also, the sludge from chromium-containing wastewater treatment is usually only treated with simple detoxification or solidification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment includes the following steps:

[0058] (1) Material preparation: crush the chromium slag to a particle size ≤ 5mm to obtain fine chromium slag; the chromium sludge is taken from the polluted soil beside the chromium slag yard, with a Cr(VI) content of 2489mg / kg and a moisture content of 17%; discarded Naturally stockpiled municipal sludge with a water content of 38% is used as the material; loose phosphogypsum is used as the gypsum; waste rock powder from limestone mining is used as the waste rock powder, and the particle size is ≤ 5mm; waste coke powder from the calcium carbide plant is used as the carbon-based material;

[0059] (2) Ingredients and homogeneity: the chromium slag fine material and chromium sludge, municipal sludge, phosphogypsum, waste rock powder, and coke powder are 45% of chromium slag, 5% of chromium sludge, and 18% of municipal sludge according to the mass ratio , 2% phosphogypsum, 23% waste rock powder, and 7% coke powder, which a...

Embodiment 2

[0065] This embodiment includes the following steps:

[0066] (1) Material preparation: crush the chromium slag to a particle size of ≤5mm to obtain fine chromium slag; the chromium sludge is the underground sludge at the chromium slag storage place, with a Cr(VI) content of 3289mg / kg and a moisture content of 17%; discarded Winery waste residue-distiller's grains are used as the material, with a moisture content of 41%; lemon gypsum is used as the gypsum; dry-process acetylene carbide slag is used as the waste rock powder, with a moisture content of 4%; the waste residue from the refinery-petroleum coke is used as the carbon-based material;

[0067] (2) Ingredients and homogeneity: the chromium slag fine material and chromium sludge, distiller's grains, lemon gypsum, carbide slag, and petroleum coke are 15% chromium slag, 42% chromium sludge, 10% distiller's grains, and lemon gypsum 3 %, 25% calcium carbide slag, and 5% petroleum coke, which are uniformly rolled and mixed int...

Embodiment 3

[0074] This embodiment includes the following steps:

[0075] (1) Wet detoxification of chromium slag was used, and 2.3% of Cr(VI) was detected; the chromium sludge was underground sludge at the chromium slag storage place, with an average Cr(VI) content of 3189mg / kg and a cement content of 16%; the waste was selected Dehydrated aged sludge and cassava slag, the moisture content of aged sludge is 27%, and the moisture content of cassava slag is 55%; the gypsum is made of waste gypsum mold; the waste stone powder is made of lime slag; the carbon base is made of anthracite;

[0076] According to the mass ratio, it is 47% of chromium residue, 10% of chromium sludge, 15% of waste (including 10% of aged sludge and 5% of cassava residue), 3% of waste gypsum mold, 20% of lime residue, and 5% of anthracite. Use a vertical mill to grind to make a powder with a fineness of 80 μm and 60% of the sieve. Hot air is used for grinding, and dust-containing hot exhaust gas from a roasting kiln ...

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Abstract

A method for preparing active slag powder by utilizing chromium slag and chromium sludge employs chromium slag, chromium sludge, waste, gypsum, waste stone powder and a carbon-base substance as raw materials, performing material preparation, mixing and homogenization, shaping, and reduction roasting and quenching, adding an alcohol amine type auxiliary agent and gypsum ingredient, or adding an alcohol amine type auxiliary agent, modified bentonite and gypsum ingredient, and together grinding to form the active slag powder with the fineness of 80 mu m and the screening tailings content of 18% or less. The method is simple in technology, small in investment, large in resource utilization amount, and free of secondary pollution or potential pollution trouble, also is capable of simultaneously recycling, decomposing and receiving chromium slag, chromium-polluted soil and other wastes, is thorough in detoxifying processing and relatively low in utilization cost, and realizes ultimate resource processing utilization.

Description

technical field [0001] The invention relates to a detoxification and harmless resource utilization method of chromium slag and chromium-containing sludge soil, in particular to a method for preparing active slag powder by using chromium slag and chromium sludge. Background technique [0002] Chromium slag is a toxic waste discharged during the production of chromium salts. The main mineral composition of chromium slag is dicalcium silicate, calcium aluminum ferrite, periclase, sodium chromate tetrahydrate, calcium chromoaluminate, basic ferric chromate, calcium chromite, etc. The harmful components in chromium slag are mainly hexavalent compounds such as sodium chromate tetrahydrate and calcium chromate. The fluctuation range of the chemical composition of chromium slag is roughly in the range of Cr 2 o 3 2.5~7%, CaO 24~44%, MgO 8~36%, Al 2 o 3 5~10%, Fe 2 o 3 2~12%, SiO 2 4~30%, water-soluble Cr +6 0.27~1.35%, acid-soluble Cr +6 0.9~1.5%. Hexavalent chromiu...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/36C04B7/52
CPCY02P40/10Y02P40/121
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司
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