A process for producing chromium trioxide from industrial chromium-containing sludge
A technology of chromium trioxide and process method, applied in the field of producing chromium trioxide, can solve the problems of low product value, difficult to popularize and use, and high processing cost
Active Publication Date: 2016-11-09
杨全坤
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Problems solved by technology
At present, the treatment process of chromium hydroxide waste residue has also been reported in China, but these processes are seldom used. The main reason is that the process is complicated, the treatment cost is high, and the product value is low. So it is difficult to promote the use of
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[0022] Such as figure 1 Shown, a kind of processing method utilizing industrial chromium-containing sludge to produce dichromium trioxide comprises the steps:
[0023] (1) Drying: Put the industrial chromium-containing sludge into the drying room for drying; the main component of the chromium-containing sludge is chromium hydroxide.
[0024] (2) Pulverization: use a crusher to pulverize the dried massive sludge into small particles;
[0025] (3) High-temperature calcination: Put the pulverized small particles into a high-temperature-resistant container and send them to a pusher kiln. After being calcined at a temperature of 1000°C to 1300°C, they are cooled from the cooling zone and then sent out of the pusher kiln to obtain chromium trioxide. Crude product; it takes 20 hours for small particles to enter the pusher kiln and leave the pusher kiln; the high-temperature combustion chamber can be fired continuously for 24 hours, and the kiln is usually shut down until the year-en...
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The invention discloses a process method of producing chromium sesquioxide by utilizing industrial chromium-containing sludge. The method comprises the following steps: drying the industrial chromium-containing sludge in a drying room; crushing the dried blocky sludge into small particles by using a crusher; loading the small crushed particles into a high-temperature-resistant container, and then pushing the container into a pushed-slab kiln, calcining the container at a high temperature, cooling the container through a cooling belt, and then conveying the container out of the pushed-slab kiln to obtain a crude chromium sesquioxide product; putting an out-of-kiln product namely the crude chromium sesquioxide product into a closed crusher, crushing the product into small particles, conveying the small particles into an airflow vortex ultra-micro crusher through a conveying belt for crushing, performing iron removal for the first time through a belt iron remover, and conveying the small particles into a dry-powder vertical-type permanent-magnet iron remover for further iron removal, so that the obtained chromium sesquioxide is an ultrafine finished product with higher purity. The obtained finished product contains an extremely small number of elements such as copper, aluminum and zinc and incombustible impurities, and the content of the chromium-containing sludge is low, and the purity of the finished product can be about 90 percent or even higher. After being sampled and detected, the finished product can be weighed and packaged, and a removed ferromagnet is a byproduct.
Description
technical field [0001] The invention belongs to the field of chemical treatment methods, and in particular relates to a process for producing chromium trioxide by utilizing industrial chromium-containing sludge. Background technique [0002] At present, in domestic electroplating plants, the following two methods are basically used for the treatment of chromium-containing wastewater: one is chemical precipitation, and the other is resin column filtration. However, there are defects in these two methods. One is to deposit waste residue by chemical method, which needs to occupy a large amount of land for storage, and after being eroded and washed by acid rain, it will also cause environmental pollution; Although the waste liquid produced in the filter can be used to recover sodium dichromate, there are secondary pollutants in the recovery process. Therefore a very important point is the treatment of chromium hydroxide residue after the treatment of chromium-containing wastewa...
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IPC IPC(8): C01G37/02
CPCC01G37/02
Inventor 杨全坤
Owner 杨全坤