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Analysis of hazardous waste in cement kiln co-processing

Date:2019-05-23 17:56     writer:admin     Views:

  Basic situation of co-processing of cement kiln

  The so-called co-processing of cement kiln requires three conditions:

  (1)Guarantee the production of cement;

  (2)Meeting the standards for heavy metal emissions in the atmosphere;

  (3)The purpose of co-processing, including co-processing waste, urban, living, and industrial, and now there are more collaborative domestic wastes, and co-processing of domestic sludge to co-dispose urban living waste. Some places also include the Yangtze River floating things, straw and so on.

  There are two points to be reminded here:
     (1) Collaborative disposal of domestic waste in cement kiln can only be a supplement to the domestic waste disposal mode;
     (2) The cement kiln co-processing hazardous waste threshold is relatively high, including site selection and operational requirements.

  For location selection, each region is different. The project for co-processing project is based on the requirements of the hazardous waste disposal center. The site selection for the hazardous waste disposal center is to find the place first. The requirements for meeting the site selection specifications of chemical enterprises are basically the same. The requirements for cement kiln are among the existing cement production enterprises, the enterprise that is suitable for co-processing is the first problem in site selection. The second problem is because there is a standard for the discharge of hazardous waste disposal centers, and there are standards for co-processing of cement kilns. There is a major problem in hazardous waste disposal standards regarding dioxin and heavy metal emissions; but in addition to these in cement kiln co-processing there is one, that is, the local will be introduced own emission standards and specifications. Therefore, the site selection criteria for cement kiln coordination will be stricter than that for hazardous waste disposal centers.

  Before the cement kiln co-disposal, we call it the test. After the dangerous waste enters the market, we will test it, including PH value, flammability and explosiveness, calorific value etc. We will take t he test and the test is finished. Laboratory test, whether the acid or alkali should be integrated, whether the concentration is relatively high, whether it is pre-treatment etc., the flammable and explosive, acid and alkali should be reduced to the minimum through the treatment, and sent to the cement kiln smoothly through the equipment. Leave some hazardous waste disposal centers have to do some operations such as extracting heavy metals before incineration. The cement kiln has not yet been in these stages, and there is no deep treatment of heavy metals. It is only what the cement kiln can do, and there is no deliberate request for safety. On the basis of resource utilization.

  The disposal capacity of the cement kiln is in accordance with the Japanese, for example, the processing capacity of 5, 000 tons/day is called 5,000 tons. A big principle is that the amount of hazardous waste in the cement kiln co-disposal does not exceed 3% of its own production capacity. This is a prerequisite; the cement kiln synergy mainly uses waste heat, and the utilization of waste heat has the best value. If it exceeds, it will not be worth the candle.

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