CN1140600C

CN1140600C - Binder for briquettes

Info

Publication number: CN1140600C
Application number: CNB001110802A
Authority: CN
Inventors: 毕绪昌; 周福明; 程秀女; 鲍莉
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-22
Filing date: 2000-04-22
Publication date: 2004-03-03
Anticipated expiration: 2020-04-22
Also published as: CN1320670A

Abstract

The present invention belongs to a binding agent of inorganic compositions, which is mainly used for preparing various briquettes, particularly briquettes used for making gas in industries. The binding agent of the present invention is compounded from cement clinker, SiO2 ash and water reducing agents in a compounding proportion (weight ratio) of 10: (0.75 to 1.5): (0.25 to 0.75). The binding agent of the present invention uses a dual-solidification principle, and has the advantages of strong cohesiveness, simple hydration technology, high sulfur-fixing effect and environment pollution reduction. The cold cohesiveness of the present invention is 100 kg/unit, hot cohesiveness is 85 kg/unit, and a solidification mode does not need baking. The present invention can reduce the discharge capacity of CO2, SO2 and C granules.

Description

Briquette binder

The invention belongs to the binding agent of inorganic components, be mainly used in and make various moulded coals, in particular for industrial gas briquette.

Outside the coal carbon removal piece, still there are low calorie fuelss such as a large amount of coal dusts, coal slime, low-calorie flyash, bone coal, coal gangue to develop, make it to become the useful fuel of industry, widen energy sources, reduce and pollute, reduce the industrial production cost, increase economical efficiency and social benefit; Utilize tackiness agent that above-mentioned low calorie fuels is made moulded coal, this part low-calorie fuel is fully utilized, for society makes contributions.Industrial shaping coal is required to have excellent waterproofness,, still can keep higher compressive strength so that loose because of suction when transportation and outdoor storage; Require in addition that ash is low, fixed carbon is high, the efficiency of combustion height, sulfur-bearing is low, Heat stability is good, thus guarantee user's benefit.According to application target, moulded coal can be divided into gas making (chemical fertilizer), coal gas, boiler, civilian four kinds of moulded coals, and whether moulded coal has application prospect thus, and one of key is to select inexpensive rational tackiness agent for use, and tackiness agent should possess following condition is arranged in specific words:

(1), raw material resources are abundant, easily gather materials on the spot low price;

(2), manufacture craft is simple, need not dry energy-conservation, less investment.

(3), prepared moulded coal excellent performance;

(4), the tackiness agent ash is lower, and characteristics such as good solid sulphur, solid dirt are arranged.

In existing technology, according to adhesive therefor, all exist shortcoming separately, can not well be used:

(1), the pitch moulded coal, the cost height needs to mix 0.5～1 hour under 150～200 ℃ of temperature, complex process, fire prevention difference and contaminate environment.

(2), lime-carbonated moulded coal: adding 25% lime is tackiness agent, carbonization (CO ₂) long 9～10 hours of time, ash height, complex process.

(3), clay moulded coal: with the clay is tackiness agent, and this tackiness agent is not prevented fires, and intensity is low, increases the ash height.

(4), the starch composite briquette: with starch and mineral substance (as silicate) is tackiness agent, needs 100～150 ℃ of oven dry, complex process, water resistance is poor.

(5), spent pulping liquor moulded coal: with spent pulping liquor is tackiness agent, need to concentrate, oven dry, the moisture absorption, water-repellancy be poor.

(6), cement moulded coal: with cement is tackiness agent, and grow and be thermally-stabilised poor set time in preparation, increases ash content.

(7), polyvinyl alcohol is the principal mode coal: the cost height needs oven dry, poor heat stability.

In a word, every kind of binding agent all has outstanding shortcoming separately, can not or not exclusively can satisfy user's requirement.

The purpose that the present invention proposes briquette binder promptly is to make the moulded coal of its preparation to have characteristics such as waterproof is good, early strong, high-strength (particularly heat is strong), low ash content, inexpensive and preparation technology be simple.

The technical scheme of binding agent of the present invention is: the present invention adopts two principles of solidification, and first heavily solidifies, and calcium oxide series adds water, produces calcium hydroxide Ca (OH) ₂Solution solidifies gradually in air or calls it " aquation ", with SiO ₂Ash chemical combination.SiO ₂Ash itself does not possess or only possesses extremely low gelling, but at normal temperatures it can with calcium hydroxide Ca (OH) ₂Chemical combination generates the gelling hydrate, and hardens in air or in the water, because of silicon oxide sio ₂Ash general designation silicon ash, particle is superfine, and glass is spherical, its particle diameter 0.1～1 μ M, so it is a kind of specific moulded coal dopant.Repeatedly laboratory and worker examination all proves its excellent properties:

(1), can increase substantially cold strong ultimate compression strength, 90～100Kg/.

(2), can increase substantially the strong ultimate compression strength of heat to 85Kg/.

(3), set time 25% can be done sth. in advance.

(4), use 1Kg silicon ash can replace 4Kg master's sizing, can reduce ashes 3% significantly.

Because SiO ₂Ash is superfine, causes the water requirement surge as the dopant of moulded coal, influences other performance of moulded coal.In order to control amount of water, add water reducer and compensated, dosage is SiO ₂About 1/3～1/2 (weight) of ash, test of many times proves, and is respond well.

Thus, consisting of of binding agent of the present invention proposed: cement clinker, SiO ₂Ash, water reducer; Wherein the proportioning ratio of each component is (weight ratio): cement clinker 10: SiO ₂Ash 0.75～1.5: water reducer 0.25～0.75.

The present invention with the proportioning of coal dust (end) is in use: binding agent 4.5～7%: coal dust (end) 93～95.5%.

Wherein, coal dust can add coal slime in (end), and its add-on is 4～5% (weight) of coal dust (end).

Coal dust can be the waste material of coal washery.

SiO ₂Ash also claims the silicon ash, can utilize the silicon ash of refining ferrosilicon, wherein SiO ₂Account for more than 92%.

Cement clinker is the leading raw material of water material production process, is the best with the cement clinker of rotary kiln production, wherein mainly contains C ₂S, C ₃The S composition.

When binding agent of the present invention prepared moulded coal with coal dust (end) in use, amount of water was 10～15% (comprising coal self moisture content) of overall weight (tackiness agent coal).

Adopt pair roller type shaper or hydraulic screw shaper during preparation, preparation method and equipment are existing mature technology, only make general remark at this:

The process simple declaration of adhesive preparation moulded coal of the present invention:

1, the aequum cement clinker is pulverized, ball milling becomes 200～300 orders.

2, add the plaster of Paris and changed a social system, its add-on can be 0.5～1% (weight) of cement clinker.

3, SiO ₂Ash, water reducer all adding in the desired amount are mixed and stir.

4, the coal dust (end) that adds aequum, and the stirring that is mixed, even.

5, adding water in the desired amount mixes.

6, utilize pair roller type shaper or the moulding of hydraulic screw shaper.

7, preserve moisture about 24 hours, make required moulded coal.

The binding agent composition that the present invention proposes all is the following pulvis of 0.08mm, at first cement clinker is pulverized ball milling and meets the requirements of particle, presses its proportional quantity and other composition silicon ash, water reducer weighing and burden, mixes being binding agent of the present invention.

Briquette binder of the present invention is used to prepare various classification moulded coals, compared with prior art, following advantage is arranged:

1, raw material sources are wide, and are cheap, preparation gas-making type coal 25-27 unit/ton.

2, two curing have very strong cohesiveness, the cold 100kg/ of can arriving by force, and it is individual that heat can arrive 85kg/ by force.

3, curing mode need not dried, and aquation technology is simple.

4, water resistance is good.

5, this binding agent is a pulvis, is not subjected to the not influence of coal moisture content variation.

6, can reduce CO ₂, SO ₂And the quantity discharged and the sulfur-fixing rate height of C grain, reduce environmental pollution.

7, this binding agent ash is low, and moulded coal ash increased value 4～5%, improves moulded coal fixed carbon, significantly improves thermal value.

8, any fuel (high-quality or low grade coal) all can adopt the various moulded coals of adhesive preparation of the present invention, has widened energy sources.

The coal dust (end) that adds when embodiment 1:(weight percent) comprising preparation

Cement clinker 4%

SiO ₂Ash 6 ‰

Water reducer 3 ‰

Surplus is coal dust (end), adds the coal slime of its weight 5% in the coal dust (end).

The coal dust (end) that adds when embodiment 2:(weight percent) comprising preparation

Cement clinker 5%

SiO ₂Ash 3 ‰

Water reducer 1.5 ‰

Surplus is coal dust (end)

Embodiment 3:(weight percent)

Cement clinker 85%

SiO ₂Ash 10%

Water reducer 5%

Claims

1, a kind of briquette binder is characterized in that the proportioning ratio (weight ratio) of each component of described binding agent is: 10 parts of cement clinkers: 0.75～1.5 part of SiO ₂Ash: 0.25～0.75 part of water reducer.

2, the application of briquette binder according to claim 1 is characterized in that: the proportioning of binding agent and coal dust (weight ratio) is 4.5～7%: 93～95.5%.

3, the application of briquette binder according to claim 2 is characterized in that: the add-on of water is 10～15% of binding agent and a coal dust gross weight.