Purpose of heavy metal sludge, acid pellet and preparation method and purpose thereof

A technology for heavy metal sludge and sludge oxidation, which is applied to blast furnaces, furnace types, furnaces, etc., can solve the problem of inability to effectively deal with comprehensive utilization of stainless steel cold-rolled heavy metal sludge, so as to facilitate the smooth flow of the process and ensure the grade of the furnace , The effect of reducing the cost of raw materials

Active Publication Date: 2010-08-18
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0013] The first technical problem to be solved by the present invention is to propose a use of stainless steel cold-rolled heavy metal sludge to

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  • Purpose of heavy metal sludge, acid pellet and preparation method and purpose thereof
  • Purpose of heavy metal sludge, acid pellet and preparation method and purpose thereof

Examples

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[0061] Example 1:

[0062] After the stainless steel cold-rolled heavy metal sludge is dried and pulverized, 25% of the heavy metal sludge (weight percentage of the total weight of the raw materials used to make sludge oxidation pellets, the same below), iron powder 50%, carbon powder 4% , The compounding binder is 6% and the moisture content is 15%. After mixing uniformly, green balls are produced. The pressure of the balls is 3500N, and the particle size of the pellets is 15mm.

[0063] Among them, the stainless steel cold-rolled heavy metal sludge is the enriched heavy metal sludge produced in the two-step precipitation method of "chemical reduction + liquid caustic soda + lime milk". The chemical composition and weight percentage of the dry basis of the stainless steel cold-rolled heavy metal sludge are : T.Fe: 38.5%; Cr 2 O 3 : 3.5%; NiO: 0.5%; CaO: 35.5%; Al 2 O 3 :3.8%; SiO 2 :5.4%; CaF 2 : 5.9%; MgO: 0.2%; Na 2 O+K 2 O: 3.6%; S: 2.5%; P<0.1%; the balance is impurities. The...

Example Embodiment

[0068] Example 2:

[0069] After the stainless steel cold-rolled heavy metal sludge is dried and crushed, the weight of the heavy metal sludge is 50% (the weight percentage of the total weight of the raw materials used to make the sludge oxidation pellets, the same below), iron fine powder 30%, carbon powder 5 %, 2% of the composite binder, and 13% of the moisture content. After being evenly mixed, green balls are produced. The pressure of the balls is 3000N, and the particle size of the pellets is 12.5mm.

[0070] Among them, the stainless steel cold-rolled heavy metal sludge is the enriched heavy metal sludge produced by the two-step precipitation method of "chemical reduction + liquid caustic soda + lime milk". The chemical composition and weight percentage of the dry basis of the stainless steel cold-rolled heavy metal sludge are : T.Fe: 39.8%; Cr 2 O 3 : 4.9%; NiO: 1.0%; CaO: 29.5%; Al 2 O 3 : 2.4%; SiO 2 :3.5%; CaF 2 : 11.9%; MgO: 0.1%; Na 2 O+K 2 O: 4.6%; S: 1.5%; P<0.1%; th...

Example Embodiment

[0076] Example 3:

[0077] After the stainless steel cold-rolled heavy metal sludge is dried and pulverized, the weight of heavy metal sludge is 5% (weight percentage, the same below), iron powder 60%, carbon powder 15%, composite binder 8%, moisture 12% After mixing uniformly, green pellets are produced. The pelletizing pressure is 4000N and the pellet size is 15mm.

[0078] Among them, the stainless steel cold-rolled heavy metal sludge is a mixed sludge produced by the lime milk one-step precipitation method. The chemical composition and weight percentage of the dry basis of the stainless steel cold-rolled heavy metal sludge are: T.Fe: 12.5%; Cr 2 O 3 : 2.9%; NiO: 0.4%; CaO: 44.5%; Al 2 O 3 :4.4%; SiO 2 :5.2%; CaF 2 :17.9%; MgO: 0.4%; Na 2 O+K 2 O: 4.5%; S: 4.8%; P: 0.1%; the balance is impurities.

[0079] The formula of the composite binder: Bentonite 50% (weight percentage, the same below), slaked lime 15%, sodium carbonate 5%, PAM 10%, CMC-Na 10%, modified starch 10%.

[0080] T...

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Abstract

The invention discloses a purpose of heavy metal sludge, an acid pellet and a preparation method and a purpose thereof. The invention takes stainless steel cold-rolling heavy metal sludge as a raw material for preparing the acid pellet of the sludge. The acid pellet of the sludge is mainly prepared by the following raw materials by weight percent: 5-50 percent of stainless steel cold-rolling heavy metal sludge, 30-70 percent of iron ore concentrate, 2-8 percent of composite binding agent, 4-15 percent of carbon powder and 10-30 percent of water. The preparation method of the acid pellet of the sludge comprises the main steps of pretreatment of raw materials, mixing of raw materials, pelletizing and roasting. The acid pellet of the sludge is used as a raw material of a blast furnace. The invention solves the problems that the prior art can not effectively treat and comprehensively utilize the stainless steel cold-rolling heavy metal sludge.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of stainless steel cold-rolled heavy metal sludge, and relates to the use of stainless steel cold-rolled heavy metal sludge; the invention also relates to a kind of sludge oxidation pellets, in particular to the production of stainless steel cold-rolled heavy metal sludge as the main raw material The sludge oxidation pellet; the present invention also relates to the manufacture method and application of the sludge oxidation pellet. Background technique [0002] In the pickling process of stainless steel coils, a large amount of pickling wastewater will be produced, and the main pollutant components are: T.Fe, Cr 6+ , T.Cr, Ni 2+ , F - , SO 4 2- , S.S., Zn 2+ , Pb 2+ Wait. At present, the most mature and widely used treatment process for this kind of pickling wastewater is the chemical reduction precipitation method. The chemical reduction precipitation method can be divided into "ch...

Claims

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Application Information

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IPC IPC(8): C22B1/248C22B1/242C22B1/16C21B5/00
Inventor 石磊陈荣欢石洪志顾德仁王如意
Owner BAOSHAN IRON & STEEL CO LTD
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