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Harmless treatment method for reducing stainless steel leftover sludge at medium temperature

A disposal method, stainless steel technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of rising production costs, lack of competitiveness, high treatment costs, etc., and achieve low operating costs, The effect of small footprint and broad market prospects

Inactive Publication Date: 2014-01-01
SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, at present, the equipment investment required for the above-mentioned waste disposal treatment is also very huge, and the treatment cost is very high, which leads to the increase of the production cost of stainless steel production enterprises, and ultimately leads to the lack of competitiveness, etc.

Method used

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  • Harmless treatment method for reducing stainless steel leftover sludge at medium temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0030] according to figure 1 In the operation method shown, the amount of 130T / day waste generated by the stainless steel production enterprise is firstly dried. After measurement, the water content is 65% just after leaving the production line, and after it reaches 40% after drying, the waste Dried in a drier until the water content of the leftover mud is 10%, respectively 5% by mass, calcium oxide and coal are mixed into the leftover mud, and stirred evenly, wherein the water-soluble pH of the leftover mud is measured as 8.2 ( According to the ratio of 1:4), put the mixed material into the muffle furnace for sintering, the sintering temperature is constant at 610°C, take out a sample every half an hour, mark them as 1, 2, 3, 4, and last for 2 hours. Use the sulfuric acid nitric acid method for extreme toxicity leaching of the samples (the identification standard for hazardous waste leaching toxicity identification GB5085.3-2007): take 30 grams each of samples 1, 2, 3, and 4,...

Embodiment 2

[0036]According to the same method of embodiment 1, the waste sludge produced by the stainless steel production enterprise is first dried in the air. After measuring, the water content just after leaving the production line is 65%. Drying in medium temperature until the moisture content of the waste sludge is 8%, respectively 6% by mass, mix calcium oxide and coal into the waste sludge, and use ball milling with pulverization to grind the average particle size of the mixed material to 0.04mm or less, stir evenly, wherein the water-soluble pH of the waste sludge is measured to be 8.2 (according to the ratio of 1:4), and then put the mixture into the muffle furnace for sintering, and the sintering temperature is kept at 680°C for 2.5 hours. The samples were taken out and measured by the method in Example 1. The treated waste sludge has met the national standard and can be discharged for treatment.

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Abstract

The invention discloses a chemical pollutant treatment method, in particular a harmless treatment method for leftover sludge produced by stainless steel processing enterprises. The method comprises the following steps of: naturally airing the stainless steel leftover sludge to ensure that the water content of the stainless steel leftover sludge is reduced to 35-45 percent; drying the leftover sludge to ensure that the water content of the stainless steel leftover sludge is reduced to 5-10 percent; adding an additive and a reducing agent into the dried stainless steel leftover sludge, and uniformly mixing; and treating the uniformly mixed stainless steel leftover sludge at the temperature of between 600 and 700DEG C for 2.0 to 2.5 hours. The method has the advantages of small investment, low energy consumption, small floor area of system facilities, high reliability, low operating cost and the like, is also suitable for harmless treatment of heavy metal-containing sludge in the electroplating industry and the like, is a new way for radically solving the problem of harmless treatment of heavy metals in the environmental protection industry, and has a wide market prospect.

Description

technical field [0001] The invention relates to a method for treating chemical pollutants, in particular to a harmless treatment method for waste sludge produced by stainless steel processing enterprises. technical background [0002] my country is a large stainless steel producing country, with an annual output of 20 million tons. A large amount of stainless steel products are produced every year, and a large amount of pickling wastewater is produced during the processing. Moreover, the sludge produced after the wastewater treatment contains a large amount of heavy metals and harmful elements, if not properly treated, it will seriously pollute the environment. [0003] According to the stainless steel pipe processing enterprises in Songyang County, Zhejiang Province, the production of stainless steel products reached more than 250,000 tons in 2011. These enterprises produce about 500,000 tons of pickling wastewater every year in the process of deep pickling of products. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12
Inventor 陈启松
Owner SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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