| Chromium salt is a traditional industrial product, its’ value will be hard to bereplaced in the future, in the international market the demand is basically stable, butthe demand in China is increasing.The factory has four production lines, single kiln capacity is less than5kt/asacale, is a typical Calcium Roasting Process, backward technology. Belong toeliminate categories in the work of national industrial structure adjustment, must beclosed before the end of the year2013. Study on the project is to make the factoryeventually get rid of environmental pressure and the crisis of survival.In the following part production process with non-calcium roasting of cleanproduction in the whole facility very common, it can make full use of existing plantresources, effectively reduce the construction investment, to ease the pressure of theuse of funds. Therefore, the plant according to the situation of using new technologyof non-calcium roasting technology is the best choice.The projects is from the chromites alkaline oxidation roasting to producequalified sodium dichromate, the overall scale of20kt/a. The main contents include amarket analysis, a technical analysis and a project design proposal.According to the experimental research, it improved the India chromites fireresistant performance, improved the reaction efficiency, and broke through therestriction of non-calcium roasting process of chromites ores.According to the technology innovation research, the use of technology to slagreplacement dolomite, limestone and so on that have calcareous filler in calciumroasting process, ultimately improve the chromium slag properties, and fundamentallyinhibition system high carcinogen (calcium chromate) generation.According to the technology innovation research, the amount of chromium slagdischarge in the production process can be reduced to nearly1/3calcium roastingprocess, brought out by chromium slag Cr6+as calcium roasting process of below1/15,it conforms to the national environmental policy.Therefore, the technical transformation project is not only tailored for the enterprise, but also the domestic first. New projects can be seamlessly and postprocessing part, do even stop rotary kiln can not stop production, makes the newproject impact on plant production control to a minimum. |
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