Treatment process method of chrome slag

A treatment process and a technology for chrome slag, applied in the field of chrome slag treatment technology, can solve the problems of slow reproduction speed of functional bacteria, reduced ability to reduce chromium, low bacterial survival rate, etc., and achieve low implementation cost, improved environmental protection, and simple implementation. Effect

Inactive Publication Date: 2012-12-12
工信华鑫科技有限公司
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Problems solved by technology

The biggest disadvantage of this method is that the survival rate of bacteria is low, and the propagation speed of functional bacteria is slow, and the incubation time generally takes more than 24 hours. ability,

Method used

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  • Treatment process method of chrome slag
  • Treatment process method of chrome slag
  • Treatment process method of chrome slag

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Embodiment 1

[0074] figure 1 A schematic flow chart of a processing method for chrome slag provided in this embodiment, referring to the illustration, the process mainly includes:

[0075] Step 101: Ball mill the chrome ballast.

[0076] In this embodiment, the original chromium slag can be ball milled to reduce its particle size and improve the effect of chromium treatment. For example but not limited to the following implementation techniques:

[0077] The loader loads the chromium slag into the belt conveyor funnel. In order to prevent dust pollution, it can also be equipped with a spray device to spray the chromium slag to reduce the dust flying rate and reduce air pollution. After the chromium slag enters the ball mill from the belt conveyor funnel through the belt conveyor, it is wet-milled with water. At this time, the circulating water of the system is used as the supplementary water of the ball mill.

[0078]After the chromium slag is ground by the ball mill, the chromium slag ...

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Abstract

The invention relates to the field of heavy metal recovery and treatment, and discloses a treatment process method of chrome slag. The method comprises the steps that: chrome slag is subjected to ball milling; the milled chrome slag is leached by using sulfuric acid, such that water-soluble sodium chromate tetrahydrate, calcium chromate, chrome calcium aluminate, basic iron chromate, chemically adsorbed hexavalent chromium, and dicalcium silicate-calcium chromate and iron calcium aluminate-calcium chromate which are hard to dissolve in water and can be dissolved in acid can be obtained by leaching. The reaction can be shown as: Ca2SiO4-CaCrO4+H2SO4+(x-1)H2O; CaSiO3.xH2O+CaCrO4+CaSO4, 4CaO.Al2O3Fe2O3-CaCrO4+H2SO4+(y-1)H2O; and CaO.Al2O3.yH2O+2CaO.Fe2O3+CaCrO4+CaSO4. A mixed material obtained by leaching is subjected to solid-liquid separation; a filter residue is washed by using water; solid-liquid separation is carried out again; a filtrate is delivered through an absorption exchange column loaded with a heavy metal absorption material; soluble chrome is absorbed and enriched in the surface of the heavy metal absorption material; backwashing and desorption are carried out, such that a concentrated chrome solution is obtained; and the solution is treated in a electrodeposition process, and chrome is recovered. With the technical scheme provided by the embodiment of the invention, highly toxic chromium element in the chrome slag can be removed, and heavy metal can be recovered and utilized. The method is beneficial for environment protection.

Description

technical field [0001] The invention relates to the field of heavy metal recycling and processing, in particular to a processing method for chromium slag. Background technique [0002] Chromium slag is a granular hard sintered solid waste with different particle sizes, and its appearance is mostly earthy gray or off-white. Due to the different raw materials and processes used, it usually contains Ca, Mg, Al, Fe, Si, Cr, Hg, Ni, etc., and is generally alkaline. There are five main forms of chromium in chromium slag: [0003] (1) Water-soluble state, hexavalent Cr generally exists in the form of chromate, and its solubility in water is relatively large. [0004] (2) Acid-soluble state, a large number of dead-burned alkaline minerals in chromium slag dissolve after encountering acid. The chromium wrapped in it is released, and this part of chromium is generally hexavalent. [0005] (3) In the bonded state, chromium that exists in the form of oxides with iron, manganese and ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/08C22B3/24C25C1/10A62D3/37A62D101/43
CPCY02P10/20
Inventor 邱建宁赵路田春友徐娜朱超杨娟娟高洪波
Owner 工信华鑫科技有限公司
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