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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 solve the problem that the existing technology cannot effectively treat and comprehensively utilize stainless steel cold-rolled heavy metal sludge

Method used

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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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] After the stainless steel cold-rolled heavy metal sludge is dried and pulverized, the heavy metal sludge is 25% (accounting for the weight percentage of the total weight of raw materials for making sludge oxidation pellets, the same below), iron fine powder 50%, and carbon powder 4%. , 6% of composite binder, 15% of moisture, mix evenly to make green balls, the ball forming pressure is 3500N, and the pellet size 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 soda + lime milk". The chemical composition and weight percentage of the dry base 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 detection basis of the aforementioned data: the...

Embodiment 2

[0069] After drying and pulverizing the stainless steel cold-rolled heavy metal sludge, 50% of the heavy metal sludge (accounting for the weight percentage of the total weight of the raw materials for making sludge oxidation pellets, the same below), 30% of iron fine powder, and 5% of carbon powder %, 2% of composite binder, and 13% of moisture, mix uniformly to make green balls, the ball forming pressure is 3000N, and the pellet size 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 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%; the balance is impurities.

[0071] The formula of composi...

Embodiment 3

[0077] After the stainless steel cold-rolled heavy metal sludge is dried and pulverized, according to the formula of 5% of heavy metal sludge (percentage by weight, the same below), 60% of iron fine powder, 15% of carbon powder, 8% of composite binder, and 12% of moisture Ratio, mix evenly to make green pellets, the ball forming pressure is 4000N, and the pellet size is 15mm.

[0078] Among them, the stainless steel cold-rolled heavy metal sludge is the mixed sludge produced by the milk of lime one-step precipitation method, and the chemical composition and weight percentage of the dry base 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: 50% of bentonite (percentage by weight, the same below), 15% of slaked lime, 5% of sodium carbonate, 10% o...

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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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