CN1277164A

CN1277164A - Lime producing process utilizing dicyandiamide sludge as material

Info

Publication number: CN1277164A
Application number: CN 00113513
Authority: CN
Inventors: 曾求成; 曾广洪; 曾平
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-27
Filing date: 2000-06-27
Publication date: 2000-12-20
Anticipated expiration: 2020-06-27
Also published as: CN1151990C

Abstract

The lime producing process features the high-temperature calcination of dicycandiamide sludge with small amount of anthracite and includes the steps of material preparation, making blank with sludge, calcination and crushing after being taking out. The present invention eliminate the environmental pollution caused by dicyandiamide while utilizing dicyandiamide and has low production cost, low power consumption and high product quality.

Description

A kind of technology of utilizing dicyandiamide sludge as material to produce lime

The present invention relates to a kind of technology of utilizing dicyandiamide sludge as material to produce lime.

At present, adopting Wingdale to be fired into lime, be the basic raw material that is widely used in building trade, and the technological process of production Dyhard RU 100 product is a large amount of waste residues of lime → calcium carbide → lime nitrogen → Dyhard RU 100 → generation; The producer of existing production Dyhard RU 100 product, produce a large amount of dicyandiamide sludge as material in process of production, pile up like a mountain for its waste residue, takies a large amount of soils, simultaneously, this waste residue contains certain objectionable impurities, cause certain influence to surrounding environment, promptly tap water is polluted, and farm crop are endangered, so falling into disuse a large amount of soils can not farming, bring certain loss near resident; Producing Dyhard RU 100 producer all needs certain fund to compensate near resident every year.

The objective of the invention is to overcome above-mentioned defective, a kind of technology of utilizing dicyandiamide sludge as material to produce lime is provided.

Technical scheme of the present invention: be to utilize dicyandiamide sludge as material to become lime through high-temperature firing with a little hard coal, dicyandiamide sludge as material and anthracitic injected volume proportioning are 90～95 parts: 5～10 parts, concrete production technique is to comprise the feedstock production → waste residue base → calcination → pulverizing of coming out of the stove.

Feedstock production: be with the selected stockyard of pouring into of dicyandiamide sludge as material, allow it dewater naturally standby below 25%; Hard coal is pulverized, and the anthracitic particle after it is pulverized is less than standby below the 1.5mm.

The waste residue base: dicyandiamide sludge as material is prepared into blank, its blank be shaped as irregular different shape; As circle shape, rib shape, bulk and the shape etc. that sticks together, the water ratio of blank is 18～20%.

Calcination: be successively to place stove in by the injected volume proportioning waste residue blank and hard coal, promptly throw in one deck hard coal, throw in one deck waste residue blank again, stack is stacked and is placed in the stove successively, the calcination of lighting a fire again, its calcination top temperature is 700～900 ℃, blank is to fire from lower to upper in stove, after stove bottom blank is fired into the slow naturally cooling of calcium oxide earlier, begin to twitch the grate in the stove, the calcium oxide that bakes of bottom in the stove is come out of the stove, hard coal after stove its top feed mouth adds the waste residue blank successively and pulverizes continues calcination simultaneously, be the furnace bottom discharging, top filling, the streamline operration that circulates is successively fired.

The pulverizing of coming out of the stove: after the calcium oxide that bakes is come out of the stove, enter to pulverize in the pulverizer and get final product.

The present invention in production process, its dicyandiamide sludge as material blank with pulverize after anthracitic injected volume proportioning be 90～95 parts: 5～10 parts, promptly in stove, add 90～95 parts dicyandiamide sludge as material blank, need to add 5～10 parts hard coal.Owing to contain the carbon more than 12% in the dicyandiamide sludge as material, the calcium hydroxide more than 70% drops into calcination in the stove with the waste residue blank, when the whole burnings of its carbon are complete, just becomes calcium oxide.So anthracitic injected volume seldom, thereby saved the energy.Simultaneously, appropriate regulation fire door air quantity in the calcination process makes temperature-stable in the stove, and the calcination effect is good, can obtain high-quality product.

The lime that the present invention produces, assay shows that its product leading indicator is as follows through relevant product quality supervision and inspection mechanism:

Calcium oxide content is 83.36%, and fineness is 200 orders, and whiteness is 98%.

In sum, the invention solves environmental pollution problems, utilize dicyandiamide sludge as material to produce lime, waste residue is recycled, the protection environmental water systems is not contaminated, and it is low to have a production cost, and power consumption is few, good product quality, be that product physique is light, particle is thin, whiteness is good, remarkable in economical benefits; Simultaneously, there is not the problem of foaming, because in producing the Dyhard RU 100 chemical reaction process, passed through hydrolysis; So this product can not foam in use, can make the wall that whitewashes keep smooth bright and clean beautiful.

Claims

1, a kind of technology of utilizing dicyandiamide sludge as material to produce lime is characterized in that:

A, the technology of utilizing dicyandiamide sludge as material to produce lime are to utilize dicyandiamide sludge as material and a little hard coal to form through high-temperature firing, its dicyandiamide sludge as material and anthracitic injected volume proportioning are 90～95 parts: 5～10 parts, concrete production technique is to comprise the feedstock production → waste residue base → calcination → pulverizing of coming out of the stove;

B, feedstock production are with the selected stockyard of pouring into of dicyandiamide sludge as material, allow it dewater standby below 25% naturally, and hard coal is pulverized, and the hard coal particle after it is pulverized is less than standby below the 1.5mm;

C, dicyandiamide sludge as material is prepared into blank, its blank water ratio is 18～20%;

D, calcination is with the waste residue blank and the hard coal after pulverizing places in the stove according to the injected volume proportioning successively, promptly throw in one deck hard coal, throw in one deck waste residue blank again, stack is stacked and is placed in the stove successively, the calcination of lighting a fire again, its calcination top temperature is 700～900 ℃, blank is to fire from lower to upper in stove, be after stove bottom blank is fired into the slow naturally cooling of calcium oxide earlier, begin to twitch grate in the stove, the calcium oxide that bakes of stove inner bottom part is come out of the stove, and the hard coal after the furnace roof opening for feed adds the waste residue blank successively and pulverizes continues to fire simultaneously, and streamline operration successively circulates;

After E, the calcium oxide blank that bakes are come out of the stove, enter to pulverize in the pulverizer and get final product.